[{"_id":"9891","user_id":"55222","department":[{"_id":"151"}],"language":[{"iso":"eng"}],"type":"conference","publication":"Proceedings of ISMA - International Conference of Noise and Vibration. 2014","abstract":[{"text":"A measurement method is presented that combines the advantages of the multisine measurement technique with a prediction method for peak bending behavior. This combination allows the analysis of the dynamic behavior of mechanical structures at distinctly reduced measurement durations and has the advantage of reducing high excitation impacts on the structure under test. After a brief presentation of the algorithm, the validity scope of the approach is investigated with emphasis on an exemplary error investigation.","lang":"eng"}],"status":"public","date_updated":"2019-05-20T13:28:24Z","date_created":"2019-05-20T13:26:57Z","author":[{"last_name":"Sprock","full_name":"Sprock, Christian","first_name":"Christian"},{"first_name":"Walter","full_name":"Sextro, Walter","id":"21220","last_name":"Sextro"}],"title":"Time-efficient analysis of nonlinear peak bending behavior.","year":"2014","citation":{"bibtex":"@inproceedings{Sprock_Sextro_2014, title={Time-efficient analysis of nonlinear peak bending behavior.}, booktitle={Proceedings of ISMA - International Conference of Noise and Vibration. 2014}, author={Sprock, Christian and Sextro, Walter}, year={2014}, pages={1–8} }","short":"C. Sprock, W. Sextro, in: Proceedings of ISMA - International Conference of Noise and Vibration. 2014, 2014, pp. 1–8.","mla":"Sprock, Christian, and Walter Sextro. “Time-Efficient Analysis of Nonlinear Peak Bending Behavior.” <i>Proceedings of ISMA - International Conference of Noise and Vibration. 2014</i>, 2014, pp. 1–8.","apa":"Sprock, C., &#38; Sextro, W. (2014). Time-efficient analysis of nonlinear peak bending behavior. In <i>Proceedings of ISMA - International Conference of Noise and Vibration. 2014</i> (pp. 1–8).","ieee":"C. Sprock and W. Sextro, “Time-efficient analysis of nonlinear peak bending behavior.,” in <i>Proceedings of ISMA - International Conference of Noise and Vibration. 2014</i>, 2014, pp. 1–8.","chicago":"Sprock, Christian, and Walter Sextro. “Time-Efficient Analysis of Nonlinear Peak Bending Behavior.” In <i>Proceedings of ISMA - International Conference of Noise and Vibration. 2014</i>, 1–8, 2014.","ama":"Sprock C, Sextro W. Time-efficient analysis of nonlinear peak bending behavior. In: <i>Proceedings of ISMA - International Conference of Noise and Vibration. 2014</i>. ; 2014:1-8."},"page":"1-8"},{"language":[{"iso":"eng"}],"department":[{"_id":"151"}],"user_id":"55222","_id":"9892","status":"public","publication":"Proceedings of 31st Danubia-Adria Symposium. 2014","type":"conference","title":"Vibration Analysis of Mechanical Structures using Multisine Excitation Techniques","date_created":"2019-05-20T13:26:59Z","author":[{"full_name":"Sprock, Christian","last_name":"Sprock","first_name":"Christian"},{"last_name":"Sextro","full_name":"Sextro, Walter","id":"21220","first_name":"Walter"}],"date_updated":"2019-09-16T10:56:34Z","citation":{"chicago":"Sprock, Christian, and Walter Sextro. “Vibration Analysis of Mechanical Structures Using Multisine Excitation Techniques.” In <i>Proceedings of 31st Danubia-Adria Symposium. 2014</i>, 2014.","ieee":"C. Sprock and W. Sextro, “Vibration Analysis of Mechanical Structures using Multisine Excitation Techniques,” in <i>Proceedings of 31st Danubia-Adria Symposium. 2014</i>, 2014.","ama":"Sprock C, Sextro W. Vibration Analysis of Mechanical Structures using Multisine Excitation Techniques. In: <i>Proceedings of 31st Danubia-Adria Symposium. 2014</i>. ; 2014.","short":"C. Sprock, W. Sextro, in: Proceedings of 31st Danubia-Adria Symposium. 2014, 2014.","bibtex":"@inproceedings{Sprock_Sextro_2014, title={Vibration Analysis of Mechanical Structures using Multisine Excitation Techniques}, booktitle={Proceedings of 31st Danubia-Adria Symposium. 2014}, author={Sprock, Christian and Sextro, Walter}, year={2014} }","mla":"Sprock, Christian, and Walter Sextro. “Vibration Analysis of Mechanical Structures Using Multisine Excitation Techniques.” <i>Proceedings of 31st Danubia-Adria Symposium. 2014</i>, 2014.","apa":"Sprock, C., &#38; Sextro, W. (2014). Vibration Analysis of Mechanical Structures using Multisine Excitation Techniques. In <i>Proceedings of 31st Danubia-Adria Symposium. 2014</i>."},"year":"2014","quality_controlled":"1"},{"_id":"9893","user_id":"55222","series_title":"Lecture Notes in Mechanical Engineering","department":[{"_id":"151"}],"language":[{"iso":"eng"}],"type":"book_chapter","publication":"Dependability of Self-Optimizing Mechatronic Systems","editor":[{"first_name":"Jürgen","last_name":"Gausemeier","full_name":"Gausemeier, Jürgen"},{"full_name":"Josef Rammig, Franz","last_name":"Josef Rammig","first_name":"Franz"},{"first_name":"Wilhelm","full_name":"Schäfer, Wilhelm","last_name":"Schäfer"},{"first_name":"Walter","full_name":"Sextro, Walter","last_name":"Sextro"}],"status":"public","publisher":"Springer Berlin Heidelberg","date_updated":"2019-05-20T13:32:38Z","date_created":"2019-05-20T13:29:24Z","author":[{"full_name":"Trächtler, Ansgar","last_name":"Trächtler","first_name":"Ansgar"},{"last_name":"Hölscher","full_name":"Hölscher, Christian","first_name":"Christian"},{"first_name":"Christoph","last_name":"Rasche","full_name":"Rasche, Christoph"},{"first_name":"Claudia","full_name":"Priesterjahn, Claudia","last_name":"Priesterjahn"},{"last_name":"Zimmer","full_name":"Zimmer, Detmar","first_name":"Detmar"},{"first_name":"Jan","full_name":"Henning Keßler, Jan","last_name":"Henning Keßler"},{"full_name":"Stahl, Katharin","last_name":"Stahl","first_name":"Katharin"},{"first_name":"Kathrin","last_name":"Flaßkamp","full_name":"Flaßkamp, Kathrin"},{"last_name":"Vaßholz","full_name":"Vaßholz, Mareen","first_name":"Mareen"},{"full_name":"Krüger, Martin","last_name":"Krüger","first_name":"Martin"},{"last_name":"Dellnitz","full_name":"Dellnitz, Michael","first_name":"Michael"},{"last_name":"Iwanek","full_name":"Iwanek, Peter","first_name":"Peter"},{"first_name":"Peter","last_name":"Reinold","full_name":"Reinold, Peter"},{"last_name":"Hartmann","full_name":"Hartmann, Philip","first_name":"Philip"},{"first_name":"Tobias","last_name":"Meyer","full_name":"Meyer, Tobias"},{"first_name":"Walter","last_name":"Sextro","id":"21220","full_name":"Sextro, Walter"}],"title":"Introduction to Self-optimization and Dependability","doi":"10.1007/978-3-642-53742-4_1","publication_identifier":{"isbn":["978-3-642-53741-7"]},"year":"2014","citation":{"mla":"Trächtler, Ansgar, et al. “Introduction to Self-Optimization and Dependability.” <i>Dependability of Self-Optimizing Mechatronic Systems</i>, edited by Jürgen Gausemeier et al., Springer Berlin Heidelberg, 2014, pp. 1–24, doi:<a href=\"https://doi.org/10.1007/978-3-642-53742-4_1\">10.1007/978-3-642-53742-4_1</a>.","bibtex":"@inbook{Trächtler_Hölscher_Rasche_Priesterjahn_Zimmer_Henning Keßler_Stahl_Flaßkamp_Vaßholz_Krüger_et al._2014, series={Lecture Notes in Mechanical Engineering}, title={Introduction to Self-optimization and Dependability}, DOI={<a href=\"https://doi.org/10.1007/978-3-642-53742-4_1\">10.1007/978-3-642-53742-4_1</a>}, booktitle={Dependability of Self-Optimizing Mechatronic Systems}, publisher={Springer Berlin Heidelberg}, author={Trächtler, Ansgar and Hölscher, Christian and Rasche, Christoph and Priesterjahn, Claudia and Zimmer, Detmar and Henning Keßler, Jan and Stahl, Katharin and Flaßkamp, Kathrin and Vaßholz, Mareen and Krüger, Martin and et al.}, editor={Gausemeier, Jürgen and Josef Rammig, Franz and Schäfer, Wilhelm and Sextro, WalterEditors}, year={2014}, pages={1–24}, collection={Lecture Notes in Mechanical Engineering} }","short":"A. Trächtler, C. Hölscher, C. Rasche, C. Priesterjahn, D. Zimmer, J. Henning Keßler, K. Stahl, K. Flaßkamp, M. Vaßholz, M. Krüger, M. Dellnitz, P. Iwanek, P. Reinold, P. Hartmann, T. Meyer, W. Sextro, in: J. Gausemeier, F. Josef Rammig, W. Schäfer, W. Sextro (Eds.), Dependability of Self-Optimizing Mechatronic Systems, Springer Berlin Heidelberg, 2014, pp. 1–24.","apa":"Trächtler, A., Hölscher, C., Rasche, C., Priesterjahn, C., Zimmer, D., Henning Keßler, J., … Sextro, W. (2014). Introduction to Self-optimization and Dependability. In J. Gausemeier, F. Josef Rammig, W. Schäfer, &#38; W. Sextro (Eds.), <i>Dependability of Self-Optimizing Mechatronic Systems</i> (pp. 1–24). Springer Berlin Heidelberg. <a href=\"https://doi.org/10.1007/978-3-642-53742-4_1\">https://doi.org/10.1007/978-3-642-53742-4_1</a>","ieee":"A. Trächtler <i>et al.</i>, “Introduction to Self-optimization and Dependability,” in <i>Dependability of Self-Optimizing Mechatronic Systems</i>, J. Gausemeier, F. Josef Rammig, W. Schäfer, and W. Sextro, Eds. Springer Berlin Heidelberg, 2014, pp. 1–24.","chicago":"Trächtler, Ansgar, Christian Hölscher, Christoph Rasche, Claudia Priesterjahn, Detmar Zimmer, Jan Henning Keßler, Katharin Stahl, et al. “Introduction to Self-Optimization and Dependability.” In <i>Dependability of Self-Optimizing Mechatronic Systems</i>, edited by Jürgen Gausemeier, Franz Josef Rammig, Wilhelm Schäfer, and Walter Sextro, 1–24. Lecture Notes in Mechanical Engineering. Springer Berlin Heidelberg, 2014. <a href=\"https://doi.org/10.1007/978-3-642-53742-4_1\">https://doi.org/10.1007/978-3-642-53742-4_1</a>.","ama":"Trächtler A, Hölscher C, Rasche C, et al. Introduction to Self-optimization and Dependability. In: Gausemeier J, Josef Rammig F, Schäfer W, Sextro W, eds. <i>Dependability of Self-Optimizing Mechatronic Systems</i>. Lecture Notes in Mechanical Engineering. Springer Berlin Heidelberg; 2014:1-24. doi:<a href=\"https://doi.org/10.1007/978-3-642-53742-4_1\">10.1007/978-3-642-53742-4_1</a>"},"page":"1-24"},{"page":"173-188","citation":{"chicago":"Trächtler, Ansgar, Bernd Kleinjohann, Christian Heinzemann, Christoph Rasche, Claudia Priesterjahn, Dominik Steenken, Heike Wehrheim, et al. “Case Study.” In <i>Dependability of Self-Optimizing Mechatronic Systems</i>, edited by Jürgen Gausemeier, Franz Josef Rammig, Wilhelm Schäfer, and Walter Sextro, 173–88. Lecture Notes in Mechanical Engineering. Springer Berlin Heidelberg, 2014. <a href=\"https://doi.org/10.1007/978-3-642-53742-4_4\">https://doi.org/10.1007/978-3-642-53742-4_4</a>.","ieee":"A. Trächtler <i>et al.</i>, “Case Study,” in <i>Dependability of Self-Optimizing Mechatronic Systems</i>, J. Gausemeier, F. Josef Rammig, W. Schäfer, and W. Sextro, Eds. Springer Berlin Heidelberg, 2014, pp. 173–188.","ama":"Trächtler A, Kleinjohann B, Heinzemann C, et al. Case Study. In: Gausemeier J, Josef Rammig F, Schäfer W, Sextro W, eds. <i>Dependability of Self-Optimizing Mechatronic Systems</i>. Lecture Notes in Mechanical Engineering. Springer Berlin Heidelberg; 2014:173-188. doi:<a href=\"https://doi.org/10.1007/978-3-642-53742-4_4\">10.1007/978-3-642-53742-4_4</a>","mla":"Trächtler, Ansgar, et al. “Case Study.” <i>Dependability of Self-Optimizing Mechatronic Systems</i>, edited by Jürgen Gausemeier et al., Springer Berlin Heidelberg, 2014, pp. 173–88, doi:<a href=\"https://doi.org/10.1007/978-3-642-53742-4_4\">10.1007/978-3-642-53742-4_4</a>.","bibtex":"@inbook{Trächtler_Kleinjohann_Heinzemann_Rasche_Priesterjahn_Steenken_Wehrheim_Gausemeier_Flaßkamp_Kleinjohann_et al._2014, series={Lecture Notes in Mechanical Engineering}, title={Case Study}, DOI={<a href=\"https://doi.org/10.1007/978-3-642-53742-4_4\">10.1007/978-3-642-53742-4_4</a>}, booktitle={Dependability of Self-Optimizing Mechatronic Systems}, publisher={Springer Berlin Heidelberg}, author={Trächtler, Ansgar and Kleinjohann, Bernd and Heinzemann, Christian and Rasche, Christoph and Priesterjahn, Claudia and Steenken, Dominik and Wehrheim, Heike and Gausemeier, Jürgen and Flaßkamp, Kathrin and Kleinjohann, Lisa and et al.}, editor={Gausemeier, Jürgen and Josef Rammig, Franz and Schäfer, Wilhelm and Sextro, WalterEditors}, year={2014}, pages={173–188}, collection={Lecture Notes in Mechanical Engineering} }","short":"A. Trächtler, B. Kleinjohann, C. Heinzemann, C. Rasche, C. Priesterjahn, D. Steenken, H. Wehrheim, J. Gausemeier, K. Flaßkamp, L. Kleinjohann, M. Krüger, P. Iwanek, P. Hartmann, R. Dorociak, S. Groesbrink, S. Ziegert, T. Meyer, W. Sextro, W. Schäfer, in: J. Gausemeier, F. Josef Rammig, W. Schäfer, W. Sextro (Eds.), Dependability of Self-Optimizing Mechatronic Systems, Springer Berlin Heidelberg, 2014, pp. 173–188.","apa":"Trächtler, A., Kleinjohann, B., Heinzemann, C., Rasche, C., Priesterjahn, C., Steenken, D., … Schäfer, W. (2014). Case Study. In J. Gausemeier, F. Josef Rammig, W. Schäfer, &#38; W. Sextro (Eds.), <i>Dependability of Self-Optimizing Mechatronic Systems</i> (pp. 173–188). Springer Berlin Heidelberg. <a href=\"https://doi.org/10.1007/978-3-642-53742-4_4\">https://doi.org/10.1007/978-3-642-53742-4_4</a>"},"year":"2014","publication_identifier":{"isbn":["978-3-642-53741-7"]},"doi":"10.1007/978-3-642-53742-4_4","title":"Case Study","date_created":"2019-05-20T13:29:25Z","author":[{"first_name":"Ansgar","full_name":"Trächtler, Ansgar","last_name":"Trächtler"},{"first_name":"Bernd","last_name":"Kleinjohann","full_name":"Kleinjohann, Bernd"},{"first_name":"Christian","full_name":"Heinzemann, Christian","last_name":"Heinzemann"},{"first_name":"Christoph","last_name":"Rasche","full_name":"Rasche, Christoph"},{"full_name":"Priesterjahn, Claudia","last_name":"Priesterjahn","first_name":"Claudia"},{"full_name":"Steenken, Dominik","last_name":"Steenken","first_name":"Dominik"},{"last_name":"Wehrheim","full_name":"Wehrheim, Heike","first_name":"Heike"},{"full_name":"Gausemeier, Jürgen","last_name":"Gausemeier","first_name":"Jürgen"},{"full_name":"Flaßkamp, Kathrin","last_name":"Flaßkamp","first_name":"Kathrin"},{"full_name":"Kleinjohann, Lisa","last_name":"Kleinjohann","first_name":"Lisa"},{"first_name":"Martin","full_name":"Krüger, Martin","last_name":"Krüger"},{"first_name":"Peter","last_name":"Iwanek","full_name":"Iwanek, Peter"},{"first_name":"Philip","full_name":"Hartmann, Philip","last_name":"Hartmann"},{"last_name":"Dorociak","full_name":"Dorociak, Rafal","first_name":"Rafal"},{"first_name":"Stefan","last_name":"Groesbrink","full_name":"Groesbrink, Stefan"},{"last_name":"Ziegert","full_name":"Ziegert, Steffen","first_name":"Steffen"},{"first_name":"Tobias","last_name":"Meyer","full_name":"Meyer, Tobias"},{"id":"21220","full_name":"Sextro, Walter","last_name":"Sextro","first_name":"Walter"},{"full_name":"Schäfer, Wilhelm","last_name":"Schäfer","first_name":"Wilhelm"}],"publisher":"Springer Berlin Heidelberg","date_updated":"2019-05-20T13:34:38Z","status":"public","editor":[{"last_name":"Gausemeier","full_name":"Gausemeier, Jürgen","first_name":"Jürgen"},{"last_name":"Josef Rammig","full_name":"Josef Rammig, Franz","first_name":"Franz"},{"first_name":"Wilhelm","last_name":"Schäfer","full_name":"Schäfer, Wilhelm"},{"first_name":"Walter","last_name":"Sextro","full_name":"Sextro, Walter"}],"publication":"Dependability of Self-Optimizing Mechatronic Systems","type":"book_chapter","language":[{"iso":"eng"}],"department":[{"_id":"151"}],"series_title":"Lecture Notes in Mechanical Engineering","user_id":"55222","_id":"9894"},{"type":"conference","publication":"Proceedings of the 47th International Symposium on Microelectronics (IMAPS)","abstract":[{"lang":"eng","text":"Power semiconductor modules are used to control and switch high electrical currents and voltages. Within the power module package wire bonding is used as an interconnection technology. In recent years, aluminum wire has been used preferably, but an ever-growing market of powerful and efficient power modules requires a material with better mechanical and electrical properties. For this reason, a technology change from aluminum to copper is indispensable. However, the copper wire bonding process reacts more sensitive to parameter changes. This makes manufacturing reliable copper bond connections a challenging task. The aim of the BMBF funded project Itsowl-InCuB is the development of self-optimizing techniques to enable the reliable production of copper bond connections under varying conditions. A model of the process is essential to achieve this aim. This model needs to include the dynamic elasto-plastic deformation, the ultrasonic softening effect and the proceeding adhesion between wire and substrate. This paper focusses on the pre-deformation process. In the touchdown phase, the wire is pressed into the V-groove of the tool and a small initial contact area between wire and substrate arise. The local characteristics of the material change abruptly because of the cold forming. Consequently, the pre-deformation has a strong effect on the joining process. In [1], a pre-cleaning effect during the touchdown process of aluminum wires by cracking of oxide layers was presented. These interactions of the process parameters are still largely unknown for copper. In a first step, this paper validates the importance of modeling the pre-deformation by showing its impact on the wire deformation characteristic experimentally. Creating cross-section views of pre-deformed copper wires has shown a low deformation degree compared to aluminum. By using a digital microscope and a scanning confocal microscope an analysis about the contact areas and penetration depths after touchdown has been made. Additionally, it has to be taken into account that the dynamical touchdown force depends on the touchdown speed and the touchdown force set in the bonding machine. In order to measure the overshoot in the force signals, a strain gauge sensor has been used. Subsequently, the affecting factors have been interpreted independently Furthermore, the material properties of copper wire have been investigated with tensile tests and hardness measurements. In a second step, the paper presents finite element models of the touchdown process for source and destination bonds. These models take the measured overshoot in the touchdown forces into account. A multi-linear, isotropic material model has been selected to map the material properties of the copper. A validation of the model with the experimental determined contact areas, normal pressures and penetration depths reveals the high model quality. Thus, the simulation is able to calculate and visualize the three dimensional pre-deformation with an integrated material parameter of the wire if the touchdown parameters of the bonding machine are known. Based on the calculated deformation degrees of wire and substrate, it is probably possible to investigate the effect of the pre-deformation on the pre-cleaning phase in the copper wire bonding."}],"status":"public","project":[{"name":"Intelligente Herstellung zuverlässiger Kupferbondverbindungen","_id":"92","grant_number":"02 PQ2210"}],"_id":"9895","user_id":"210","department":[{"_id":"151"}],"keyword":["pre-deformation","copper wire bonding","finite element model"],"language":[{"iso":"eng"}],"place":"San Diego, CA, US","year":"2014","citation":{"ama":"Unger A, Sextro W, Althoff S, et al. Experimental and Numerical Simulation Study of Pre-Deformed Heavy Copper Wire Wedge Bonds. In: <i>Proceedings of the 47th International Symposium on Microelectronics (IMAPS)</i>. San Diego, CA, US; 2014:289-294.","ieee":"A. Unger <i>et al.</i>, “Experimental and Numerical Simulation Study of Pre-Deformed Heavy Copper Wire Wedge Bonds,” in <i>Proceedings of the 47th International Symposium on Microelectronics (IMAPS)</i>, 2014, pp. 289–294.","chicago":"Unger, Andreas, Walter Sextro, Simon Althoff, Paul Eichwald, Tobias Meyer, Florian Eacock, and Michael Brökelmann. “Experimental and Numerical Simulation Study of Pre-Deformed Heavy Copper Wire Wedge Bonds.” In <i>Proceedings of the 47th International Symposium on Microelectronics (IMAPS)</i>, 289–94. San Diego, CA, US, 2014.","apa":"Unger, A., Sextro, W., Althoff, S., Eichwald, P., Meyer, T., Eacock, F., &#38; Brökelmann, M. (2014). Experimental and Numerical Simulation Study of Pre-Deformed Heavy Copper Wire Wedge Bonds. In <i>Proceedings of the 47th International Symposium on Microelectronics (IMAPS)</i> (pp. 289–294). San Diego, CA, US.","bibtex":"@inproceedings{Unger_Sextro_Althoff_Eichwald_Meyer_Eacock_Brökelmann_2014, place={San Diego, CA, US}, title={Experimental and Numerical Simulation Study of Pre-Deformed Heavy Copper Wire Wedge Bonds}, booktitle={Proceedings of the 47th International Symposium on Microelectronics (IMAPS)}, author={Unger, Andreas and Sextro, Walter and Althoff, Simon and Eichwald, Paul and Meyer, Tobias and Eacock, Florian and Brökelmann, Michael}, year={2014}, pages={289–294} }","short":"A. Unger, W. Sextro, S. Althoff, P. Eichwald, T. Meyer, F. Eacock, M. Brökelmann, in: Proceedings of the 47th International Symposium on Microelectronics (IMAPS), San Diego, CA, US, 2014, pp. 289–294.","mla":"Unger, Andreas, et al. “Experimental and Numerical Simulation Study of Pre-Deformed Heavy Copper Wire Wedge Bonds.” <i>Proceedings of the 47th International Symposium on Microelectronics (IMAPS)</i>, 2014, pp. 289–94."},"page":"289-294","date_updated":"2020-05-07T05:33:47Z","date_created":"2019-05-20T13:35:09Z","author":[{"first_name":"Andreas","last_name":"Unger","full_name":"Unger, Andreas"},{"last_name":"Sextro","full_name":"Sextro, Walter","id":"21220","first_name":"Walter"},{"first_name":"Simon","full_name":"Althoff, Simon","last_name":"Althoff"},{"last_name":"Eichwald","full_name":"Eichwald, Paul","first_name":"Paul"},{"first_name":"Tobias","full_name":"Meyer, Tobias","last_name":"Meyer"},{"last_name":"Eacock","full_name":"Eacock, Florian","first_name":"Florian"},{"first_name":"Michael","last_name":"Brökelmann","full_name":"Brökelmann, Michael"}],"title":"Experimental and Numerical Simulation Study of Pre-Deformed Heavy Copper Wire Wedge Bonds"},{"year":"2014","citation":{"chicago":"Unger, Andreas, Walter Sextro, Simon Althoff, Tobias Meyer, Michael Brökelmann, Klaus Neumann, René Felix Reimann, Karsten Guth, and Daniel Bolowski. “Data-Driven Modeling of the Ultrasonic Softening Effect for Robust Copper Wire Bonding.” In <i>Proceedings of 8th International Conference on Integrated Power Electronic Systems</i>, 141:175–80, 2014.","ieee":"A. Unger <i>et al.</i>, “Data-driven Modeling of the Ultrasonic Softening Effect for Robust Copper Wire Bonding,” in <i>Proceedings of 8th International Conference on Integrated Power Electronic Systems</i>, 2014, vol. 141, pp. 175–180.","ama":"Unger A, Sextro W, Althoff S, et al. Data-driven Modeling of the Ultrasonic Softening Effect for Robust Copper Wire Bonding. In: <i>Proceedings of 8th International Conference on Integrated Power Electronic Systems</i>. Vol 141. ; 2014:175-180.","apa":"Unger, A., Sextro, W., Althoff, S., Meyer, T., Brökelmann, M., Neumann, K., … Bolowski, D. (2014). Data-driven Modeling of the Ultrasonic Softening Effect for Robust Copper Wire Bonding. In <i>Proceedings of 8th International Conference on Integrated Power Electronic Systems</i> (Vol. 141, pp. 175–180).","bibtex":"@inproceedings{Unger_Sextro_Althoff_Meyer_Brökelmann_Neumann_Reimann_Guth_Bolowski_2014, title={Data-driven Modeling of the Ultrasonic Softening Effect for Robust Copper Wire Bonding}, volume={141}, booktitle={Proceedings of 8th International Conference on Integrated Power Electronic Systems}, author={Unger, Andreas and Sextro, Walter and Althoff, Simon and Meyer, Tobias and Brökelmann, Michael and Neumann, Klaus and Reimann, René Felix and Guth, Karsten and Bolowski, Daniel}, year={2014}, pages={175–180} }","mla":"Unger, Andreas, et al. “Data-Driven Modeling of the Ultrasonic Softening Effect for Robust Copper Wire Bonding.” <i>Proceedings of 8th International Conference on Integrated Power Electronic Systems</i>, vol. 141, 2014, pp. 175–80.","short":"A. Unger, W. Sextro, S. Althoff, T. Meyer, M. Brökelmann, K. Neumann, R.F. Reimann, K. Guth, D. Bolowski, in: Proceedings of 8th International Conference on Integrated Power Electronic Systems, 2014, pp. 175–180."},"intvolume":"       141","page":"175-180","title":"Data-driven Modeling of the Ultrasonic Softening Effect for Robust Copper Wire Bonding","date_updated":"2020-05-07T05:33:47Z","date_created":"2019-05-20T13:38:10Z","author":[{"first_name":"Andreas","last_name":"Unger","full_name":"Unger, Andreas"},{"first_name":"Walter","full_name":"Sextro, Walter","id":"21220","last_name":"Sextro"},{"full_name":"Althoff, Simon","last_name":"Althoff","first_name":"Simon"},{"full_name":"Meyer, Tobias","last_name":"Meyer","first_name":"Tobias"},{"first_name":"Michael","full_name":"Brökelmann, Michael","last_name":"Brökelmann"},{"first_name":"Klaus","last_name":"Neumann","full_name":"Neumann, Klaus"},{"first_name":"René Felix","last_name":"Reimann","full_name":"Reimann, René Felix"},{"first_name":"Karsten","full_name":"Guth, Karsten","last_name":"Guth"},{"first_name":"Daniel","full_name":"Bolowski, Daniel","last_name":"Bolowski"}],"volume":141,"abstract":[{"lang":"eng","text":"In power electronics, ultrasonic wire bonding is used to connect the electrical terminals of power modules. To implement a self-optimization technique for ultrasonic wire bonding machines, a model of the process is essential. This model needs to include the so called ultrasonic softening effect. It is a key effect within the wire bonding process primarily enabling the robust interconnection between the wire and a substrate. However, the physical modeling of the ultrasonic softening effect is notoriously difficult because of its highly non-linear character and the absence of a proper measurement method. In a first step, this paper validates the importance of modeling the ultrasonic softening by showing its impact on the wire deformation characteristic experimentally. In a second step, the paper presents a data-driven model of the ultrasonic softening effect which is constructed from data using machine learning techniques. A typical caveat of data-driven modeling is the need for training data that cover the considered domain of process parameters in order to achieve accurate generalization of the trained model to new process configurations. In practice, however, the space of process parameters can only be sampled sparsely. In this paper, a novel technique is applied which enables the integration of prior knowledge about the process into the datadriven modeling process. It turns out that this approach results in accurate generalization of the data-driven model to unseen process parameters from sparse data."}],"status":"public","type":"conference","publication":"Proceedings of 8th International Conference on Integrated Power Electronic Systems","language":[{"iso":"eng"}],"project":[{"_id":"92","name":"Intelligente Herstellung zuverlässiger Kupferbondverbindungen","grant_number":"02 PQ2210"}],"_id":"9896","user_id":"210","department":[{"_id":"151"}]},{"title":"Konzeption, Ansteuerung und Eigenschaften schneller piezoelektrischer Trägheitsmotoren","date_created":"2019-05-20T13:02:32Z","author":[{"last_name":"Hunstig","full_name":"Hunstig, Matthias","first_name":"Matthias"}],"date_updated":"2023-09-15T12:29:21Z","publisher":"Shaker","citation":{"ieee":"M. Hunstig, <i>Konzeption, Ansteuerung und Eigenschaften schneller piezoelektrischer Trägheitsmotoren</i>. Shaker, 2014.","chicago":"Hunstig, Matthias. <i>Konzeption, Ansteuerung Und Eigenschaften Schneller Piezoelektrischer Trägheitsmotoren</i>. Shaker, 2014.","ama":"Hunstig M. <i>Konzeption, Ansteuerung Und Eigenschaften Schneller Piezoelektrischer Trägheitsmotoren</i>. Shaker; 2014.","bibtex":"@book{Hunstig_2014, title={Konzeption, Ansteuerung und Eigenschaften schneller piezoelektrischer Trägheitsmotoren}, publisher={Shaker}, author={Hunstig, Matthias}, year={2014} }","short":"M. Hunstig, Konzeption, Ansteuerung Und Eigenschaften Schneller Piezoelektrischer Trägheitsmotoren, Shaker, 2014.","mla":"Hunstig, Matthias. <i>Konzeption, Ansteuerung Und Eigenschaften Schneller Piezoelektrischer Trägheitsmotoren</i>. Shaker, 2014.","apa":"Hunstig, M. (2014). <i>Konzeption, Ansteuerung und Eigenschaften schneller piezoelektrischer Trägheitsmotoren</i>. Shaker."},"year":"2014","language":[{"iso":"eng"}],"keyword":["Tr{\\"],"department":[{"_id":"151"}],"user_id":"210","_id":"9875","status":"public","abstract":[{"text":"Piezoelektrische Trägheitsmotoren nutzen die Trägheit einer bewegten Masse, um diese über einen ununterbrochenen Reibkontakt schrittweise zu bewegen. Wegen ihres einfachen Aufbaus und ihrer guten Miniaturisierbarkeit werden diese Motoren zunehmend in Konsumgütern eingesetzt. Die Geschwindigkeit ist eine wichtige Motorkenngröße, eine allgemeingültige Analyse des Motorprinzips existiert jedoch bisher nicht.Nach einer Definition von Trägheitsmotoren werden anhand eines Modells eines translatorischen piezoelektrischen Trägheitsmotors verschiedene idealisierte Anregungssignale hergeleitet. Eine Analyse des Motorverhaltens zeigt, dass der verbreitete Betrieb von Trägheitsmotoren mit Haft- und Gleitphasen für das Erreichen hoher Geschwindigkeiten ungeeignet ist. Aus den idealisierten Signalen für den schnellen dauergleitenden Betrieb werden frequenzbeschränkte Signale für den Betrieb mit realen Aktoren abgeleitet. Das Verhalten bei Anregung mit diesen Signalen wird bezüglich Geschwindigkeit, Effizienz, Haltbarkeit und Kraft verglichen. Zudem wird ein Verfahren beschrieben, mit dem die Bewegung hochfrequent angeregter Trägheitsmotoren periodenweise berechnet und wichtige Motorkenngrößen direkt berechnet werden können. Zur Validierung der theoretischen Ergebnisse wird ein Versuchsmotor aufgebaut und mit unterschiedlichen Signalen angeregt, es zeigt sich eine gute Übereinstimmung zwischen Messung und Modell. Die Ergebnisse dieser Arbeit geben wertvolle Einblicke in die Funktion schneller Trägheitsmotoren und sind nützlich für ihre weitere Entwicklung und die Erweiterung ihres Einsatzbereichs.","lang":"eng"}],"type":"dissertation"},{"language":[{"iso":"eng"}],"_id":"9794","user_id":"55222","department":[{"_id":"151"}],"abstract":[{"text":"A piezoelectric cantilever beam with a tip mass at its free end is a common energy harvester configuration. This article introduces a new principle of designing such a harvester that increases the generated power without changing the resonance frequency of the harvester: the attraction force between two permanent magnets is used to add stiffness to the system. This magnetic stiffening counters the effect of the tip mass on the efficient operation frequency. Five set-ups incorporating piezoelectric bimorph cantilevers of the same type in different mechanical configurations are compared theoretically and experimentally to investigate the feasibility of this principle: theoretical and experimental results show that magnetically stiffened harvesters have important advantages over conventional set-ups with and without tip mass. They generate more power while only slightly increasing the deflection in the piezoelectric harvester and they can be tuned across a wide range of excitation frequencies.","lang":"eng"}],"status":"public","type":"journal_article","publication":"Journal of Intelligent Material Systems and Structures","title":"Increasing the power of piezoelectric energy harvesters by magnetic stiffening","doi":"10.1177/1045389X13483021","date_updated":"2022-01-06T07:04:20Z","date_created":"2019-05-13T13:51:00Z","author":[{"last_name":"Al-Ashtari","full_name":"Al-Ashtari, Waleed","first_name":"Waleed"},{"first_name":"Matthias","last_name":"Hunstig","full_name":"Hunstig, Matthias"},{"first_name":"Tobias","full_name":"Hemsel, Tobias","id":"210","last_name":"Hemsel"},{"last_name":"Sextro","id":"21220","full_name":"Sextro, Walter","first_name":"Walter"}],"volume":24,"year":"2013","citation":{"ama":"Al-Ashtari W, Hunstig M, Hemsel T, Sextro W. Increasing the power of piezoelectric energy harvesters by magnetic stiffening. <i>Journal of Intelligent Material Systems and Structures</i>. 2013;24(11):1332-1342. doi:<a href=\"https://doi.org/10.1177/1045389X13483021\">10.1177/1045389X13483021</a>","ieee":"W. Al-Ashtari, M. Hunstig, T. Hemsel, and W. Sextro, “Increasing the power of piezoelectric energy harvesters by magnetic stiffening,” <i>Journal of Intelligent Material Systems and Structures</i>, vol. 24, no. 11, pp. 1332–1342, 2013.","chicago":"Al-Ashtari, Waleed, Matthias Hunstig, Tobias Hemsel, and Walter Sextro. “Increasing the Power of Piezoelectric Energy Harvesters by Magnetic Stiffening.” <i>Journal of Intelligent Material Systems and Structures</i> 24, no. 11 (2013): 1332–42. <a href=\"https://doi.org/10.1177/1045389X13483021\">https://doi.org/10.1177/1045389X13483021</a>.","apa":"Al-Ashtari, W., Hunstig, M., Hemsel, T., &#38; Sextro, W. (2013). Increasing the power of piezoelectric energy harvesters by magnetic stiffening. <i>Journal of Intelligent Material Systems and Structures</i>, <i>24</i>(11), 1332–1342. <a href=\"https://doi.org/10.1177/1045389X13483021\">https://doi.org/10.1177/1045389X13483021</a>","bibtex":"@article{Al-Ashtari_Hunstig_Hemsel_Sextro_2013, title={Increasing the power of piezoelectric energy harvesters by magnetic stiffening}, volume={24}, DOI={<a href=\"https://doi.org/10.1177/1045389X13483021\">10.1177/1045389X13483021</a>}, number={11}, journal={Journal of Intelligent Material Systems and Structures}, author={Al-Ashtari, Waleed and Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}, year={2013}, pages={1332–1342} }","mla":"Al-Ashtari, Waleed, et al. “Increasing the Power of Piezoelectric Energy Harvesters by Magnetic Stiffening.” <i>Journal of Intelligent Material Systems and Structures</i>, vol. 24, no. 11, 2013, pp. 1332–42, doi:<a href=\"https://doi.org/10.1177/1045389X13483021\">10.1177/1045389X13483021</a>.","short":"W. Al-Ashtari, M. Hunstig, T. Hemsel, W. Sextro, Journal of Intelligent Material Systems and Structures 24 (2013) 1332–1342."},"intvolume":"        24","page":"1332-1342","issue":"11"},{"keyword":["Energy harvesting","Cantilever array","Bandwidth","Power increase"],"language":[{"iso":"eng"}],"_id":"9795","department":[{"_id":"151"}],"user_id":"55222","abstract":[{"text":"Power and bandwidth of piezoelectric harvesters can be increased by using multiple piezoelectric elements in one harvester. In this contribution, a novel energy harvesting cantilever array with magnetic tuning including three piezoelectric bimorphs is investigated theoretically and experimentally, with a good agreement between model and experiment. Other than harvester designs proposed before, this array is easy to manufacture and insensitive to manufacturing tolerances because its optimum operation frequency can be re-adjusted after fabrication. Using the superposition principle, the Butterworth-Van Dyke model and a mechanical lumped parameters model, the generated voltage and current are determined analytically. Formulas for calculating the power generated by array harvesters with an arbitrary number of piezoelectric elements connected in series or in parallel are derived. It is shown that optimum harvester design must take both the connected load and the operating frequency into account. Strategies for connecting multiple bimorphs to increase the maximum generated power and/or enhance the bandwidth compared to a single bimorph harvester are investigated. For bandwidth enhancement it is essential that individual rectifiers are used for the bimorphs. An example with three bimorphs shows that, depending on the chosen tuning strategy, the power is increased by about 340\\% or the bandwidth is increased by about 500\\%, compared to one single bimorph.","lang":"eng"}],"status":"public","publication":"Sensors and Actuators A: Physical","type":"journal_article","title":"Enhanced energy harvesting using multiple piezoelectric elements: Theory and experiments","doi":"10.1016/j.sna.2013.01.008","date_updated":"2022-01-06T07:04:20Z","volume":200,"date_created":"2019-05-13T13:51:59Z","author":[{"first_name":"Waleed","full_name":"Al-Ashtari, Waleed","last_name":"Al-Ashtari"},{"full_name":"Hunstig, Matthias","last_name":"Hunstig","first_name":"Matthias"},{"first_name":"Tobias","last_name":"Hemsel","id":"210","full_name":"Hemsel, Tobias"},{"last_name":"Sextro","id":"21220","full_name":"Sextro, Walter","first_name":"Walter"}],"year":"2013","page":"138 - 146","intvolume":"       200","citation":{"ieee":"W. Al-Ashtari, M. Hunstig, T. Hemsel, and W. Sextro, “Enhanced energy harvesting using multiple piezoelectric elements: Theory and experiments,” <i>Sensors and Actuators A: Physical</i>, vol. 200, pp. 138–146, 2013.","chicago":"Al-Ashtari, Waleed, Matthias Hunstig, Tobias Hemsel, and Walter Sextro. “Enhanced Energy Harvesting Using Multiple Piezoelectric Elements: Theory and Experiments.” <i>Sensors and Actuators A: Physical</i> 200 (2013): 138–46. <a href=\"https://doi.org/10.1016/j.sna.2013.01.008\">https://doi.org/10.1016/j.sna.2013.01.008</a>.","ama":"Al-Ashtari W, Hunstig M, Hemsel T, Sextro W. Enhanced energy harvesting using multiple piezoelectric elements: Theory and experiments. <i>Sensors and Actuators A: Physical</i>. 2013;200:138-146. doi:<a href=\"https://doi.org/10.1016/j.sna.2013.01.008\">10.1016/j.sna.2013.01.008</a>","apa":"Al-Ashtari, W., Hunstig, M., Hemsel, T., &#38; Sextro, W. (2013). Enhanced energy harvesting using multiple piezoelectric elements: Theory and experiments. <i>Sensors and Actuators A: Physical</i>, <i>200</i>, 138–146. <a href=\"https://doi.org/10.1016/j.sna.2013.01.008\">https://doi.org/10.1016/j.sna.2013.01.008</a>","mla":"Al-Ashtari, Waleed, et al. “Enhanced Energy Harvesting Using Multiple Piezoelectric Elements: Theory and Experiments.” <i>Sensors and Actuators A: Physical</i>, vol. 200, 2013, pp. 138–46, doi:<a href=\"https://doi.org/10.1016/j.sna.2013.01.008\">10.1016/j.sna.2013.01.008</a>.","short":"W. Al-Ashtari, M. Hunstig, T. Hemsel, W. Sextro, Sensors and Actuators A: Physical 200 (2013) 138–146.","bibtex":"@article{Al-Ashtari_Hunstig_Hemsel_Sextro_2013, title={Enhanced energy harvesting using multiple piezoelectric elements: Theory and experiments}, volume={200}, DOI={<a href=\"https://doi.org/10.1016/j.sna.2013.01.008\">10.1016/j.sna.2013.01.008</a>}, journal={Sensors and Actuators A: Physical}, author={Al-Ashtari, Waleed and Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}, year={2013}, pages={138–146} }"}},{"keyword":["Energy harvesting","harvester modeling","load dependence","generated voltage"],"language":[{"iso":"eng"}],"_id":"9796","series_title":"Berichte aus dem IDS","user_id":"55222","department":[{"_id":"151"}],"abstract":[{"lang":"eng","text":"A basic autonomous system powered by a piezoelectric harvester contains three components apart from the harvester: a fullwave rectifier, a reservoir capacitor and an electronic device performing the primary task of the system. In this contribution, a model describing the operation of such a system is derived. It is found that in steady-state operation, the piezoelectric harvester experiences two alternating load conditions due to the rectification process. These alternating load conditions can have a significant effect on the operation of the harvester and must be considered in the design of autonomous systems. The results also show that such an autonomous system works efficiently if it is connected to a high impedance load and excited by a frequency matching the anti-resonance frequency of the piezoelectric harvester."}],"status":"public","type":"conference","publication":"Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop, Hannover, Germany, 14.-17.7.2013","title":"Characteristics of Piezoelectric Energy Harvesters in Autonomous Systems","date_updated":"2022-01-06T07:04:20Z","date_created":"2019-05-13T13:53:25Z","author":[{"full_name":"Al-Ashtari, Waleed","last_name":"Al-Ashtari","first_name":"Waleed"},{"full_name":"Hunstig, Matthias","last_name":"Hunstig","first_name":"Matthias"},{"first_name":"Tobias","last_name":"Hemsel","full_name":"Hemsel, Tobias","id":"210"},{"first_name":"Walter","last_name":"Sextro","full_name":"Sextro, Walter","id":"21220"}],"year":"2013","place":"Hannover, Germany","citation":{"ieee":"W. Al-Ashtari, M. Hunstig, T. Hemsel, and W. Sextro, “Characteristics of Piezoelectric Energy Harvesters in Autonomous Systems,” in <i>Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop, Hannover, Germany, 14.-17.7.2013</i>, 2013, no. 05/2013, pp. 159–161.","chicago":"Al-Ashtari, Waleed, Matthias Hunstig, Tobias Hemsel, and Walter Sextro. “Characteristics of Piezoelectric Energy Harvesters in Autonomous Systems.” In <i>Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop, Hannover, Germany, 14.-17.7.2013</i>, 159–61. Berichte Aus Dem IDS. Hannover, Germany, 2013.","ama":"Al-Ashtari W, Hunstig M, Hemsel T, Sextro W. Characteristics of Piezoelectric Energy Harvesters in Autonomous Systems. In: <i>Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop, Hannover, Germany, 14.-17.7.2013</i>. Berichte aus dem IDS. Hannover, Germany; 2013:159-161.","apa":"Al-Ashtari, W., Hunstig, M., Hemsel, T., &#38; Sextro, W. (2013). Characteristics of Piezoelectric Energy Harvesters in Autonomous Systems. In <i>Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop, Hannover, Germany, 14.-17.7.2013</i> (pp. 159–161). Hannover, Germany.","bibtex":"@inproceedings{Al-Ashtari_Hunstig_Hemsel_Sextro_2013, place={Hannover, Germany}, series={Berichte aus dem IDS}, title={Characteristics of Piezoelectric Energy Harvesters in Autonomous Systems}, number={05/2013}, booktitle={Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop, Hannover, Germany, 14.-17.7.2013}, author={Al-Ashtari, Waleed and Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}, year={2013}, pages={159–161}, collection={Berichte aus dem IDS} }","short":"W. Al-Ashtari, M. Hunstig, T. Hemsel, W. Sextro, in: Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop, Hannover, Germany, 14.-17.7.2013, Hannover, Germany, 2013, pp. 159–161.","mla":"Al-Ashtari, Waleed, et al. “Characteristics of Piezoelectric Energy Harvesters in Autonomous Systems.” <i>Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop, Hannover, Germany, 14.-17.7.2013</i>, no. 05/2013, 2013, pp. 159–61."},"page":"159-161","quality_controlled":"1","issue":"05/2013"},{"publication":"IMAPS 2013, 46th International Symposium on Microelectronics","type":"conference","status":"public","abstract":[{"lang":"eng","text":"A model approach for wedge/wedge bonding copper wire is presented. The connection between wire and substrate is based on a variety of physical effects, but the dominant one is the friction based welding while applying ultrasound. Consequently, a friction model was used to investigate the welding process. This model is built up universal and can be used to describe the formation of micro welds in the time variant contact area between wire and substrate. Aim of the model is to identify the interactions between touchdown, bond normal force, ultrasonic power and bonding time. To do so, the contact area is discretized into partial areas where a Point Contact Model is applied. Based on this approach it is possible to simulate micro and macro slip inside the contact area between wire and substrate. The work done by friction force is a main criterion to define occurring micro joints which influence the subsequent welding."}],"department":[{"_id":"151"}],"user_id":"55222","_id":"9797","language":[{"iso":"eng"}],"keyword":["Wire bonding","friction modeling","wire bond quality","contact element modeling"],"citation":{"chicago":"Althoff, Simon, Jan Neuhaus, Tobias Hemsel, and Walter Sextro. “A Friction Based Approach for Modeling Wire Bonding.” In <i>IMAPS 2013, 46th International Symposium on Microelectronics</i>. Orlando (Florida), USA, 2013. <a href=\"https://doi.org/10.4071/isom-2013-TA67\">https://doi.org/10.4071/isom-2013-TA67</a>.","ieee":"S. Althoff, J. Neuhaus, T. Hemsel, and W. Sextro, “A friction based approach for modeling wire bonding,” in <i>IMAPS 2013, 46th International Symposium on Microelectronics</i>, 2013.","ama":"Althoff S, Neuhaus J, Hemsel T, Sextro W. A friction based approach for modeling wire bonding. In: <i>IMAPS 2013, 46th International Symposium on Microelectronics</i>. Orlando (Florida), USA; 2013. doi:<a href=\"https://doi.org/10.4071/isom-2013-TA67\">10.4071/isom-2013-TA67</a>","bibtex":"@inproceedings{Althoff_Neuhaus_Hemsel_Sextro_2013, place={Orlando (Florida), USA}, title={A friction based approach for modeling wire bonding}, DOI={<a href=\"https://doi.org/10.4071/isom-2013-TA67\">10.4071/isom-2013-TA67</a>}, booktitle={IMAPS 2013, 46th International Symposium on Microelectronics}, author={Althoff, Simon and Neuhaus, Jan and Hemsel, Tobias and Sextro, Walter}, year={2013} }","mla":"Althoff, Simon, et al. “A Friction Based Approach for Modeling Wire Bonding.” <i>IMAPS 2013, 46th International Symposium on Microelectronics</i>, 2013, doi:<a href=\"https://doi.org/10.4071/isom-2013-TA67\">10.4071/isom-2013-TA67</a>.","short":"S. Althoff, J. Neuhaus, T. Hemsel, W. Sextro, in: IMAPS 2013, 46th International Symposium on Microelectronics, Orlando (Florida), USA, 2013.","apa":"Althoff, S., Neuhaus, J., Hemsel, T., &#38; Sextro, W. (2013). A friction based approach for modeling wire bonding. In <i>IMAPS 2013, 46th International Symposium on Microelectronics</i>. Orlando (Florida), USA. <a href=\"https://doi.org/10.4071/isom-2013-TA67\">https://doi.org/10.4071/isom-2013-TA67</a>"},"place":"Orlando (Florida), USA","year":"2013","author":[{"first_name":"Simon","last_name":"Althoff","full_name":"Althoff, Simon"},{"first_name":"Jan","full_name":"Neuhaus, Jan","last_name":"Neuhaus"},{"first_name":"Tobias","id":"210","full_name":"Hemsel, Tobias","last_name":"Hemsel"},{"first_name":"Walter","id":"21220","full_name":"Sextro, Walter","last_name":"Sextro"}],"date_created":"2019-05-13T13:55:36Z","date_updated":"2022-01-06T07:04:20Z","doi":"10.4071/isom-2013-TA67","title":"A friction based approach for modeling wire bonding"},{"date_updated":"2022-01-06T07:04:20Z","date_created":"2019-05-13T13:57:49Z","author":[{"first_name":"Paul","last_name":"Eichwald","full_name":"Eichwald, Paul"},{"full_name":"Sextro, Walter","id":"21220","last_name":"Sextro","first_name":"Walter"},{"first_name":"Simon","last_name":"Althoff","full_name":"Althoff, Simon"},{"first_name":"Florian","full_name":"Eacock, Florian","last_name":"Eacock"},{"first_name":"Mark","full_name":"Schnietz, Mark","last_name":"Schnietz"},{"full_name":"Guth, Karsten","last_name":"Guth","first_name":"Karsten"},{"first_name":"Michael","full_name":"Brökelmann, Michael","last_name":"Brökelmann"}],"title":"Influences of Bonding Parameters on the Tool Wear for Copper Wire Bonding","doi":"10.1109/EPTC.2013.6745803","year":"2013","citation":{"mla":"Eichwald, Paul, et al. “Influences of Bonding Parameters on the Tool Wear for Copper Wire Bonding.” <i>15th Electronics Packaging Technology Conference</i>, 2013, doi:<a href=\"https://doi.org/10.1109/EPTC.2013.6745803\">10.1109/EPTC.2013.6745803</a>.","bibtex":"@inproceedings{Eichwald_Sextro_Althoff_Eacock_Schnietz_Guth_Brökelmann_2013, title={Influences of Bonding Parameters on the Tool Wear for Copper Wire Bonding}, DOI={<a href=\"https://doi.org/10.1109/EPTC.2013.6745803\">10.1109/EPTC.2013.6745803</a>}, booktitle={15th Electronics Packaging Technology Conference}, author={Eichwald, Paul and Sextro, Walter and Althoff, Simon and Eacock, Florian and Schnietz, Mark and Guth, Karsten and Brökelmann, Michael}, year={2013} }","short":"P. Eichwald, W. Sextro, S. Althoff, F. Eacock, M. Schnietz, K. Guth, M. Brökelmann, in: 15th Electronics Packaging Technology Conference, 2013.","apa":"Eichwald, P., Sextro, W., Althoff, S., Eacock, F., Schnietz, M., Guth, K., &#38; Brökelmann, M. (2013). Influences of Bonding Parameters on the Tool Wear for Copper Wire Bonding. In <i>15th Electronics Packaging Technology Conference</i>. <a href=\"https://doi.org/10.1109/EPTC.2013.6745803\">https://doi.org/10.1109/EPTC.2013.6745803</a>","chicago":"Eichwald, Paul, Walter Sextro, Simon Althoff, Florian Eacock, Mark Schnietz, Karsten Guth, and Michael Brökelmann. “Influences of Bonding Parameters on the Tool Wear for Copper Wire Bonding.” In <i>15th Electronics Packaging Technology Conference</i>, 2013. <a href=\"https://doi.org/10.1109/EPTC.2013.6745803\">https://doi.org/10.1109/EPTC.2013.6745803</a>.","ieee":"P. Eichwald <i>et al.</i>, “Influences of Bonding Parameters on the Tool Wear for Copper Wire Bonding,” in <i>15th Electronics Packaging Technology Conference</i>, 2013.","ama":"Eichwald P, Sextro W, Althoff S, et al. Influences of Bonding Parameters on the Tool Wear for Copper Wire Bonding. In: <i>15th Electronics Packaging Technology Conference</i>. ; 2013. doi:<a href=\"https://doi.org/10.1109/EPTC.2013.6745803\">10.1109/EPTC.2013.6745803</a>"},"_id":"9799","project":[{"grant_number":"02 PQ2210","_id":"92","name":"Intelligente Herstellung zuverlässiger Kupferbondverbindungen"}],"department":[{"_id":"151"}],"user_id":"210","language":[{"iso":"eng"}],"publication":"15th Electronics Packaging Technology Conference","type":"conference","abstract":[{"text":"Ultrasonic wire bonding is a common technology for manufacturing electrical interconnects. In the field of power electronics, new thermal and electrical obligations arose due to increasing power density requirements. One approach to achieve these aims is replacing the wire material for heavy wire bonds from aluminum to copper. This material change leads to challenging tasks and problems, for instance the occurring wear of the bond tool. The wear is significantly higher using copper wire instead of aluminum and results in a dramatic loss in the amount of interconnects which can be produced reliable by a single tool. To reduce setting-up time in the production and minimizing costs, an enlarged bonding tool lifetime is desirable. Therefore, the paper discusses the influences of bonding parameters on the wear. The key question is which of the tasks cannot be fulfilled with increased wear of the tool, e.g. loss of process capability. The main functions are fixing the wire in the tool groove, predeformation, applying normal force and transmission of ultrasonic oscillation to the wire. To identify the most affecting factors, four bonding parameters are varied and their influences are investigated. These parameters are: (I) ultrasonic power, (II) tool geometry, (III) the way of tangential force transmission and (IV) loop trajectory.","lang":"eng"}],"status":"public"},{"language":[{"iso":"eng"}],"department":[{"_id":"151"}],"series_title":"HNI-Verlagsschriftenreihe","user_id":"55222","_id":"9801","status":"public","editor":[{"first_name":"Jürgen","full_name":"Gausemeier, Jürgen","last_name":"Gausemeier"},{"full_name":"Dumitrescu, Roman","last_name":"Dumitrescu","first_name":"Roman"},{"first_name":"Franz","full_name":" Rammig, Franz","last_name":" Rammig"},{"first_name":"Wilhelm","last_name":"Schäfer","full_name":"Schäfer, Wilhelm"},{"full_name":"Trächtler, Ansgar","last_name":"Trächtler","first_name":"Ansgar"}],"publication":"9. Paderborner Workshop Entwurf mechatronischer Systeme","type":"conference","title":"Leistungs- und Bandbreitensteigerung von Energy-Harvesting-Generatoren für Energieautarke Systeme","date_created":"2019-05-13T14:02:10Z","author":[{"first_name":"Matthias","full_name":"Hunstig, Matthias","last_name":"Hunstig"},{"full_name":"Al-Ashtari, Waleed","last_name":"Al-Ashtari","first_name":"Waleed"},{"first_name":"Tobias","last_name":"Hemsel","id":"210","full_name":"Hemsel, Tobias"},{"first_name":"Walter","last_name":"Sextro","full_name":"Sextro, Walter","id":"21220"}],"date_updated":"2022-01-06T07:04:21Z","publisher":"Heinz Nixdorf Institut, Universität Paderborn","page":"359-372","citation":{"apa":"Hunstig, M., Al-Ashtari, W., Hemsel, T., &#38; Sextro, W. (2013). Leistungs- und Bandbreitensteigerung von Energy-Harvesting-Generatoren für Energieautarke Systeme. In J. Gausemeier, R. Dumitrescu, F.  Rammig, W. Schäfer, &#38; A. Trächtler (Eds.), <i>9. Paderborner Workshop Entwurf mechatronischer Systeme</i> (pp. 359–372). Paderborn: Heinz Nixdorf Institut, Universität Paderborn.","mla":"Hunstig, Matthias, et al. “Leistungs- Und Bandbreitensteigerung von Energy-Harvesting-Generatoren Für Energieautarke Systeme.” <i>9. Paderborner Workshop Entwurf Mechatronischer Systeme</i>, edited by Jürgen Gausemeier et al., Heinz Nixdorf Institut, Universität Paderborn, 2013, pp. 359–72.","bibtex":"@inproceedings{Hunstig_Al-Ashtari_Hemsel_Sextro_2013, place={Paderborn}, series={HNI-Verlagsschriftenreihe}, title={Leistungs- und Bandbreitensteigerung von Energy-Harvesting-Generatoren für Energieautarke Systeme}, booktitle={9. Paderborner Workshop Entwurf mechatronischer Systeme}, publisher={Heinz Nixdorf Institut, Universität Paderborn}, author={Hunstig, Matthias and Al-Ashtari, Waleed and Hemsel, Tobias and Sextro, Walter}, editor={Gausemeier, Jürgen and Dumitrescu, Roman and  Rammig, Franz and Schäfer, Wilhelm and Trächtler, AnsgarEditors}, year={2013}, pages={359–372}, collection={HNI-Verlagsschriftenreihe} }","short":"M. Hunstig, W. Al-Ashtari, T. Hemsel, W. Sextro, in: J. Gausemeier, R. Dumitrescu, F.  Rammig, W. Schäfer, A. Trächtler (Eds.), 9. Paderborner Workshop Entwurf Mechatronischer Systeme, Heinz Nixdorf Institut, Universität Paderborn, Paderborn, 2013, pp. 359–372.","ama":"Hunstig M, Al-Ashtari W, Hemsel T, Sextro W. Leistungs- und Bandbreitensteigerung von Energy-Harvesting-Generatoren für Energieautarke Systeme. In: Gausemeier J, Dumitrescu R,  Rammig F, Schäfer W, Trächtler A, eds. <i>9. Paderborner Workshop Entwurf Mechatronischer Systeme</i>. HNI-Verlagsschriftenreihe. Paderborn: Heinz Nixdorf Institut, Universität Paderborn; 2013:359-372.","ieee":"M. Hunstig, W. Al-Ashtari, T. Hemsel, and W. Sextro, “Leistungs- und Bandbreitensteigerung von Energy-Harvesting-Generatoren für Energieautarke Systeme,” in <i>9. Paderborner Workshop Entwurf mechatronischer Systeme</i>, 2013, pp. 359–372.","chicago":"Hunstig, Matthias, Waleed Al-Ashtari, Tobias Hemsel, and Walter Sextro. “Leistungs- Und Bandbreitensteigerung von Energy-Harvesting-Generatoren Für Energieautarke Systeme.” In <i>9. Paderborner Workshop Entwurf Mechatronischer Systeme</i>, edited by Jürgen Gausemeier, Roman Dumitrescu, Franz  Rammig, Wilhelm Schäfer, and Ansgar Trächtler, 359–72. HNI-Verlagsschriftenreihe. Paderborn: Heinz Nixdorf Institut, Universität Paderborn, 2013."},"year":"2013","place":"Paderborn"},{"place":"Hannover, Germany","year":"2013","page":"16-18","citation":{"chicago":"Hunstig, Matthias, Tobias Hemsel, and Walter Sextro. “High-Velocity Slip-Slip Operation of Piezoelectric Inertia Motors - Experimental Validation.” In <i>Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop</i>, 16–18. Hannover, Germany, 2013.","ieee":"M. Hunstig, T. Hemsel, and W. Sextro, “High-Velocity Slip-Slip Operation of Piezoelectric Inertia Motors - Experimental Validation,” in <i>Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop</i>, 2013, pp. 16–18.","ama":"Hunstig M, Hemsel T, Sextro W. High-Velocity Slip-Slip Operation of Piezoelectric Inertia Motors - Experimental Validation. In: <i>Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop</i>. Hannover, Germany; 2013:16-18.","short":"M. Hunstig, T. Hemsel, W. Sextro, in: Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop, Hannover, Germany, 2013, pp. 16–18.","bibtex":"@inproceedings{Hunstig_Hemsel_Sextro_2013, place={Hannover, Germany}, title={High-Velocity Slip-Slip Operation of Piezoelectric Inertia Motors - Experimental Validation}, booktitle={Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop}, author={Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}, year={2013}, pages={16–18} }","mla":"Hunstig, Matthias, et al. “High-Velocity Slip-Slip Operation of Piezoelectric Inertia Motors - Experimental Validation.” <i>Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop</i>, 2013, pp. 16–18.","apa":"Hunstig, M., Hemsel, T., &#38; Sextro, W. (2013). High-Velocity Slip-Slip Operation of Piezoelectric Inertia Motors - Experimental Validation. In <i>Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop</i> (pp. 16–18). Hannover, Germany."},"title":"High-Velocity Slip-Slip Operation of Piezoelectric Inertia Motors - Experimental Validation","date_updated":"2022-01-06T07:04:21Z","author":[{"first_name":"Matthias","full_name":"Hunstig, Matthias","last_name":"Hunstig"},{"last_name":"Hemsel","full_name":"Hemsel, Tobias","id":"210","first_name":"Tobias"},{"first_name":"Walter","full_name":"Sextro, Walter","id":"21220","last_name":"Sextro"}],"date_created":"2019-05-13T14:06:14Z","abstract":[{"lang":"eng","text":"It has been shown previously that ``slip-slip'' operation of piezoelectric inertia motors allows higher velocities and smoother movements than classic ``stick-slip'' operation. One very promising driving option is to use a superposition of multiple sinusoidal signals. In this contribution, previous theoretical results are validated experimentally. The results confirm the theoretical result that for a given maximum frequency, usually defined by the actuator characteristics, a signal with high fundamental frequency and consisting of two superposed sine waves leads to the highest velocity and the smoothest motion. This result is of fundamental importance for the further development of high-velocity piezoelectric inertia motors."}],"status":"public","publication":"Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop","type":"conference","keyword":["Piezoelectric inertia motor","stick-slip motor","driving signal","velocity","smoothness"],"language":[{"iso":"eng"}],"_id":"9802","department":[{"_id":"151"}],"user_id":"55222"},{"status":"public","abstract":[{"lang":"eng","text":"Piezoelectric inertia motors, also known as stickslip drives or (smooth) impact drives, use the inertia of a body to drive it by a friction contact in small steps, in the majority of motors composed of a stick phase and a slip phase between the friction partners. For optimizing inertia motors, it is important to understand the friction contact correctly and to measure its properties appropriately. This contribution presents experimental set-ups for measuring the contact force, friction force and relative displacement in an actual inertia motor with a dry friction contact and numerical simulations of the motor operation. The motor uses a pre-stressed multilayer actuator with a displacement in the range of 20 $\\mu$ m. It is shown that a previously postulated condition for the applicability of simple kinetic friction models is well fulfilled for the investigated motor. The friction contact in the motor is simulated using different kinetic friction models. The input for the friction models is the measured motion of the rod. The models qualitatively reproduce the measured motion but show quantitative deviations varying with frequency. These can be explained by vibrations of the driving rod that are experimentally investigated."}],"publication":"Journal of Intelligent Material Systems and Structures","type":"journal_article","language":[{"iso":"eng"}],"keyword":["Actuator","friction","motor","piezoelectric"],"department":[{"_id":"151"}],"user_id":"55222","_id":"9803","intvolume":"        24","page":"1380-1391","citation":{"ama":"Hunstig M, Hemsel T, Sextro W. Modelling the friction contact in an inertia motor. <i>Journal of Intelligent Material Systems and Structures</i>. 2013;24(11):1380-1391. doi:<a href=\"https://doi.org/10.1177/1045389X12474354\">10.1177/1045389X12474354</a>","ieee":"M. Hunstig, T. Hemsel, and W. Sextro, “Modelling the friction contact in an inertia motor,” <i>Journal of Intelligent Material Systems and Structures</i>, vol. 24, no. 11, pp. 1380–1391, 2013.","chicago":"Hunstig, Matthias, Tobias Hemsel, and Walter Sextro. “Modelling the Friction Contact in an Inertia Motor.” <i>Journal of Intelligent Material Systems and Structures</i> 24, no. 11 (2013): 1380–91. <a href=\"https://doi.org/10.1177/1045389X12474354\">https://doi.org/10.1177/1045389X12474354</a>.","apa":"Hunstig, M., Hemsel, T., &#38; Sextro, W. (2013). Modelling the friction contact in an inertia motor. <i>Journal of Intelligent Material Systems and Structures</i>, <i>24</i>(11), 1380–1391. <a href=\"https://doi.org/10.1177/1045389X12474354\">https://doi.org/10.1177/1045389X12474354</a>","bibtex":"@article{Hunstig_Hemsel_Sextro_2013, title={Modelling the friction contact in an inertia motor}, volume={24}, DOI={<a href=\"https://doi.org/10.1177/1045389X12474354\">10.1177/1045389X12474354</a>}, number={11}, journal={Journal of Intelligent Material Systems and Structures}, author={Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}, year={2013}, pages={1380–1391} }","short":"M. Hunstig, T. Hemsel, W. Sextro, Journal of Intelligent Material Systems and Structures 24 (2013) 1380–1391.","mla":"Hunstig, Matthias, et al. “Modelling the Friction Contact in an Inertia Motor.” <i>Journal of Intelligent Material Systems and Structures</i>, vol. 24, no. 11, 2013, pp. 1380–91, doi:<a href=\"https://doi.org/10.1177/1045389X12474354\">10.1177/1045389X12474354</a>."},"year":"2013","issue":"11","doi":"10.1177/1045389X12474354","title":"Modelling the friction contact in an inertia motor","volume":24,"author":[{"full_name":"Hunstig, Matthias","last_name":"Hunstig","first_name":"Matthias"},{"first_name":"Tobias","last_name":"Hemsel","id":"210","full_name":"Hemsel, Tobias"},{"last_name":"Sextro","id":"21220","full_name":"Sextro, Walter","first_name":"Walter"}],"date_created":"2019-05-13T14:08:01Z","date_updated":"2022-01-06T07:04:21Z"},{"title":"Stick-slip and slip-slip operation of piezoelectric inertia drives - Part II: Frequency-limited excitation","doi":"10.1016/j.sna.2012.11.043","date_updated":"2022-01-06T07:04:21Z","author":[{"full_name":"Hunstig, Matthias","last_name":"Hunstig","first_name":"Matthias"},{"last_name":"Hemsel","id":"210","full_name":"Hemsel, Tobias","first_name":"Tobias"},{"first_name":"Walter","last_name":"Sextro","id":"21220","full_name":"Sextro, Walter"}],"date_created":"2019-05-13T14:09:31Z","volume":200,"year":"2013","citation":{"apa":"Hunstig, M., Hemsel, T., &#38; Sextro, W. (2013). Stick-slip and slip-slip operation of piezoelectric inertia drives - Part II: Frequency-limited excitation. <i>Sensors and Actuators A: Physical</i>, <i>200</i>, 79–89. <a href=\"https://doi.org/10.1016/j.sna.2012.11.043\">https://doi.org/10.1016/j.sna.2012.11.043</a>","short":"M. Hunstig, T. Hemsel, W. Sextro, Sensors and Actuators A: Physical 200 (2013) 79–89.","bibtex":"@article{Hunstig_Hemsel_Sextro_2013, title={Stick-slip and slip-slip operation of piezoelectric inertia drives - Part II: Frequency-limited excitation}, volume={200}, DOI={<a href=\"https://doi.org/10.1016/j.sna.2012.11.043\">10.1016/j.sna.2012.11.043</a>}, journal={Sensors and Actuators A: Physical}, author={Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}, year={2013}, pages={79–89} }","mla":"Hunstig, Matthias, et al. “Stick-Slip and Slip-Slip Operation of Piezoelectric Inertia Drives - Part II: Frequency-Limited Excitation.” <i>Sensors and Actuators A: Physical</i>, vol. 200, 2013, pp. 79–89, doi:<a href=\"https://doi.org/10.1016/j.sna.2012.11.043\">10.1016/j.sna.2012.11.043</a>.","ama":"Hunstig M, Hemsel T, Sextro W. Stick-slip and slip-slip operation of piezoelectric inertia drives - Part II: Frequency-limited excitation. <i>Sensors and Actuators A: Physical</i>. 2013;200:79-89. doi:<a href=\"https://doi.org/10.1016/j.sna.2012.11.043\">10.1016/j.sna.2012.11.043</a>","ieee":"M. Hunstig, T. Hemsel, and W. Sextro, “Stick-slip and slip-slip operation of piezoelectric inertia drives - Part II: Frequency-limited excitation,” <i>Sensors and Actuators A: Physical</i>, vol. 200, pp. 79–89, 2013.","chicago":"Hunstig, Matthias, Tobias Hemsel, and Walter Sextro. “Stick-Slip and Slip-Slip Operation of Piezoelectric Inertia Drives - Part II: Frequency-Limited Excitation.” <i>Sensors and Actuators A: Physical</i> 200 (2013): 79–89. <a href=\"https://doi.org/10.1016/j.sna.2012.11.043\">https://doi.org/10.1016/j.sna.2012.11.043</a>."},"page":"79 - 89","intvolume":"       200","quality_controlled":"1","keyword":["Inertia motor"],"language":[{"iso":"eng"}],"_id":"9804","user_id":"55222","department":[{"_id":"151"}],"abstract":[{"text":"This contribution provides a systematic investigation and performance comparison of different modes of operation for piezoelectric inertia drives. The movement of these motors is classically assumed to consist of steps involving stiction and sliding, resulting in the term ``stick-slip drives''. In the first part of this contribution it has been found that using ideal driving signals, ``slip-slip'' operation without phases of stiction allows very high velocities, while the maximum velocity is limited principally in stick-slip operation. In this part it is shown that slip-slip operation is also suitable for use with real actuators, driven with frequency-limited versions of the ideal signals presented in part I. The motional performance of the motor as well as its wear and the required electric power are investigated for operation with different signals. It is found that for high velocity inertia motors it is recommendable to use actuators with large stroke and to drive them with a signal consisting of two harmonics at a high fundamental frequency, a result that is supported by similar setups implemented experimentally by other authors. Using Lanczos' \\sigma factors to calculate the frequency-limited excitation signals instead of standard Fourier series additionally increases the motor performance significantly. The results help motor designers to choose the appropriate mode of operation and to optimise the motor parameters for their individual applications.","lang":"eng"}],"status":"public","type":"journal_article","publication":"Sensors and Actuators A: Physical"},{"publication":"Sensors and Actuators A: Physical","type":"journal_article","abstract":[{"lang":"eng","text":"Piezoelectric inertia motors, also known as ``stick--slip drives'', use the inertia of a body to drive it in small steps by means of a friction contact. While these steps are classically assumed to involve stiction and sliding, the motors can also operate in ``slip--slip'' mode without any phase of static friction. This contribution provides a systematic investigation and performance comparison of different stick--slip and slip--slip modes of operation. Different criteria for comparing the motional performance of inertia motors are defined: Steady state velocity, smoothness of motion, and start-up time. Using the example of a translational inertia motor excited by an ideal displacement signal, it is found that the maximum velocity reachable in stick--slip operation is limited principally, while continuous slip--slip operation allows very high velocities. For the investigated driving signals, the motor velocity is proportional to the square root of the actuator stroke. The motor performance with these ideal signals defines an upper boundary for the performance of real motors."}],"status":"public","_id":"9805","department":[{"_id":"151"}],"user_id":"55222","keyword":["Inertia motor","Stick--slip drive","Mode of operation","Performance indicator","Velocity maximization","Actuator stroke"],"language":[{"iso":"eng"}],"quality_controlled":"1","year":"2013","intvolume":"       200","page":"90 - 100","citation":{"ama":"Hunstig M, Hemsel T, Sextro W. Stick-slip and slip-slip operation of piezoelectric inertia drives - Part I: Ideal Excitation. <i>Sensors and Actuators A: Physical</i>. 2013;200:90-100. doi:<a href=\"https://doi.org/10.1016/j.sna.2012.11.012\">10.1016/j.sna.2012.11.012</a>","ieee":"M. Hunstig, T. Hemsel, and W. Sextro, “Stick-slip and slip-slip operation of piezoelectric inertia drives - Part I: Ideal Excitation.,” <i>Sensors and Actuators A: Physical</i>, vol. 200, pp. 90–100, 2013.","chicago":"Hunstig, Matthias, Tobias Hemsel, and Walter Sextro. “Stick-Slip and Slip-Slip Operation of Piezoelectric Inertia Drives - Part I: Ideal Excitation.” <i>Sensors and Actuators A: Physical</i> 200 (2013): 90–100. <a href=\"https://doi.org/10.1016/j.sna.2012.11.012\">https://doi.org/10.1016/j.sna.2012.11.012</a>.","apa":"Hunstig, M., Hemsel, T., &#38; Sextro, W. (2013). Stick-slip and slip-slip operation of piezoelectric inertia drives - Part I: Ideal Excitation. <i>Sensors and Actuators A: Physical</i>, <i>200</i>, 90–100. <a href=\"https://doi.org/10.1016/j.sna.2012.11.012\">https://doi.org/10.1016/j.sna.2012.11.012</a>","bibtex":"@article{Hunstig_Hemsel_Sextro_2013, title={Stick-slip and slip-slip operation of piezoelectric inertia drives - Part I: Ideal Excitation.}, volume={200}, DOI={<a href=\"https://doi.org/10.1016/j.sna.2012.11.012\">10.1016/j.sna.2012.11.012</a>}, journal={Sensors and Actuators A: Physical}, author={Hunstig, Matthias and Hemsel, Tobias and Sextro, Walter}, year={2013}, pages={90–100} }","short":"M. Hunstig, T. Hemsel, W. Sextro, Sensors and Actuators A: Physical 200 (2013) 90–100.","mla":"Hunstig, Matthias, et al. “Stick-Slip and Slip-Slip Operation of Piezoelectric Inertia Drives - Part I: Ideal Excitation.” <i>Sensors and Actuators A: Physical</i>, vol. 200, 2013, pp. 90–100, doi:<a href=\"https://doi.org/10.1016/j.sna.2012.11.012\">10.1016/j.sna.2012.11.012</a>."},"date_updated":"2022-01-06T07:04:21Z","volume":200,"date_created":"2019-05-13T14:10:34Z","author":[{"first_name":"Matthias","full_name":"Hunstig, Matthias","last_name":"Hunstig"},{"last_name":"Hemsel","full_name":"Hemsel, Tobias","id":"210","first_name":"Tobias"},{"id":"21220","full_name":"Sextro, Walter","last_name":"Sextro","first_name":"Walter"}],"title":"Stick-slip and slip-slip operation of piezoelectric inertia drives - Part I: Ideal Excitation.","doi":"10.1016/j.sna.2012.11.012"},{"year":"2013","intvolume":"        33","page":"619-624","citation":{"ama":"Kimotho JK, Sondermann-Wölke C, Meyer T, Sextro W. Machinery Prognostic Method Based on Multi-Class Support Vector Machines and Hybrid Differential Evolution -- Particle Swarm Optimization. <i>Chemical Engineering Transactions</i>. 2013;33:619-624. doi:<a href=\"https://doi.org/10.3303/CET1333104\">10.3303/CET1333104</a>","ieee":"J. K. Kimotho, C. Sondermann-Wölke, T. Meyer, and W. Sextro, “Machinery Prognostic Method Based on Multi-Class Support Vector Machines and Hybrid Differential Evolution -- Particle Swarm Optimization,” <i>Chemical Engineering Transactions</i>, vol. 33, pp. 619–624, 2013.","chicago":"Kimotho, James Kuria, Christopher Sondermann-Wölke, Tobias Meyer, and Walter Sextro. “Machinery Prognostic Method Based on Multi-Class Support Vector Machines and Hybrid Differential Evolution -- Particle Swarm Optimization.” <i>Chemical Engineering Transactions</i> 33 (2013): 619–24. <a href=\"https://doi.org/10.3303/CET1333104\">https://doi.org/10.3303/CET1333104</a>.","apa":"Kimotho, J. K., Sondermann-Wölke, C., Meyer, T., &#38; Sextro, W. (2013). Machinery Prognostic Method Based on Multi-Class Support Vector Machines and Hybrid Differential Evolution -- Particle Swarm Optimization. <i>Chemical Engineering Transactions</i>, <i>33</i>, 619–624. <a href=\"https://doi.org/10.3303/CET1333104\">https://doi.org/10.3303/CET1333104</a>","bibtex":"@article{Kimotho_Sondermann-Wölke_Meyer_Sextro_2013, title={Machinery Prognostic Method Based on Multi-Class Support Vector Machines and Hybrid Differential Evolution -- Particle Swarm Optimization}, volume={33}, DOI={<a href=\"https://doi.org/10.3303/CET1333104\">10.3303/CET1333104</a>}, journal={Chemical Engineering Transactions}, author={Kimotho, James Kuria and Sondermann-Wölke, Christopher and Meyer, Tobias and Sextro, Walter}, year={2013}, pages={619–624} }","short":"J.K. Kimotho, C. Sondermann-Wölke, T. Meyer, W. Sextro, Chemical Engineering Transactions 33 (2013) 619–624.","mla":"Kimotho, James Kuria, et al. “Machinery Prognostic Method Based on Multi-Class Support Vector Machines and Hybrid Differential Evolution -- Particle Swarm Optimization.” <i>Chemical Engineering Transactions</i>, vol. 33, 2013, pp. 619–24, doi:<a href=\"https://doi.org/10.3303/CET1333104\">10.3303/CET1333104</a>."},"title":"Machinery Prognostic Method Based on Multi-Class Support Vector Machines and Hybrid Differential Evolution -- Particle Swarm Optimization","doi":"10.3303/CET1333104","date_updated":"2022-01-06T07:04:21Z","volume":33,"author":[{"first_name":"James Kuria","last_name":"Kimotho","full_name":"Kimotho, James Kuria"},{"full_name":"Sondermann-Wölke, Christopher","last_name":"Sondermann-Wölke","first_name":"Christopher"},{"first_name":"Tobias","full_name":"Meyer, Tobias","last_name":"Meyer"},{"first_name":"Walter","last_name":"Sextro","full_name":"Sextro, Walter","id":"21220"}],"date_created":"2019-05-13T14:13:26Z","abstract":[{"lang":"eng","text":"Recently, focus on maintenance strategies has been shifted towards prognostic health management (PHM) and a number of state of the art algorithms based on data-driven prognostics have been developed to predict the health states of degrading components based on sensory data. Amongst these algorithms, Multiclass Support Vector Machines (MC-SVM) has gained popularity due to its relatively high classification accuracy, ability to classify multiple patterns and capability to handle noisy /incomplete data. However, its application is limited by the difficulty in determining the required kernel function and penalty parameters. To address this problem, this paper proposes a hybrid differential evolution -- particle swarm optimization (DE-PSO) algorithm to optimize the MC-SVM kernel function and penalty parameters. The differential algorithm (DE) obtains the search limit for the SVM parameters, while the particle swarm optimization algorithm (PSO) determines the global optimum parameters for a given training data set. Since degrading machinery components display several degradation stages in their lifetime, the MC-SVM trained with optimum parameters are used to estimate the health states of a degrading machinery component, from which the remaining useful life (RUL) is predicted. This method improves the classification accuracy of MC-SVM in predicting the health states of a machinery component and consequently increases the accuracy of RUL predictions. The feasibility of the method is validated using bearing prognostic run-to-failure data obtained from NASA public data repository. A comparative study between MC-SVM with parameters obtained using simple grid search with n-fold cross validation and MCSVM with DE-PSO based on prognostic performance metrics reveals that the proposed method has better performance, with all the cases considered falling within a 10 \\% error margin. The method also outperforms other soft computing methods proposed in literature."}],"status":"public","publication":"Chemical Engineering Transactions","type":"journal_article","language":[{"iso":"eng"}],"_id":"9807","department":[{"_id":"151"}],"user_id":"55222"},{"status":"public","abstract":[{"text":"This study presents the methods employed by a team from the department of Mechatronics and Dynamics at the University of Paderborn, Germany for the 2013 PHM data challenge. The focus of the challenge was on maintenance action recommendation for an industrial machinery based on remote monitoring and diagnosis. Since an ensemble of data driven methods has been considered as the state of the art approach in diagnosis and prognosis, the first approach was to evaluate the performance of an ensemble of data driven methods using the parametric data as input and problems (recommended maintenance action) as the output. Due to close correlation of parametric data of different problems, this approach produced high misclassification rate. Event-based decision trees were then constructed to identify problems associated with particular events. To distinguish between problems associated with events that appeared in multiple problems, support vector machine (SVM) with parameters optimally tuned using particle swarm optimization (PSO) was employed. Parametric data was used as the input to the SVM algorithm and majority voting was employed to determine the final decision for cases with multiple events. A total of 165 SVM models were constructed. This approach improved the overall score from 21 to 48. The method was further enhanced by employing an ensemble of three data driven methods, that is, SVM, random forests (RF) and bagged trees (BT), to build the event based models. With this approach, a score of 51 was obtained . The results demonstrate that the proposed event based method can be effective in maintenance action recommendation based on events codes and parametric data acquired remotely from an industrial equipment.","lang":"eng"}],"publication":"International Journal of Prognostics and Health Management","type":"journal_article","language":[{"iso":"eng"}],"keyword":["maintenance decision","Bagged trees","Decision trees","PSO-SVM","Random forests"],"department":[{"_id":"151"}],"user_id":"55222","_id":"9808","intvolume":"         4","citation":{"ama":"Kimotho JK, Sondermann-Wölke C, Meyer T, Sextro W. Application of Event Based Decision Tree and Ensemble of Data Driven Methods for Maintenance Action Recommendation. <i>International Journal of Prognostics and Health Management</i>. 2013;4(2).","ieee":"J. K. Kimotho, C. Sondermann-Wölke, T. Meyer, and W. Sextro, “Application of Event Based Decision Tree and Ensemble of Data Driven Methods for Maintenance Action Recommendation,” <i>International Journal of Prognostics and Health Management</i>, vol. 4, no. 2, 2013.","chicago":"Kimotho, James Kuria, Chritoph Sondermann-Wölke, Tobias Meyer, and Walter Sextro. “Application of Event Based Decision Tree and Ensemble of Data Driven Methods for Maintenance Action Recommendation.” <i>International Journal of Prognostics and Health Management</i> 4, no. 2 (2013).","bibtex":"@article{Kimotho_Sondermann-Wölke_Meyer_Sextro_2013, title={Application of Event Based Decision Tree and Ensemble of Data Driven Methods for Maintenance Action Recommendation}, volume={4}, number={2}, journal={International Journal of Prognostics and Health Management}, author={Kimotho, James Kuria and Sondermann-Wölke, Chritoph and Meyer, Tobias and Sextro, Walter}, year={2013} }","mla":"Kimotho, James Kuria, et al. “Application of Event Based Decision Tree and Ensemble of Data Driven Methods for Maintenance Action Recommendation.” <i>International Journal of Prognostics and Health Management</i>, vol. 4, no. 2, 2013.","short":"J.K. Kimotho, C. Sondermann-Wölke, T. Meyer, W. Sextro, International Journal of Prognostics and Health Management 4 (2013).","apa":"Kimotho, J. K., Sondermann-Wölke, C., Meyer, T., &#38; Sextro, W. (2013). Application of Event Based Decision Tree and Ensemble of Data Driven Methods for Maintenance Action Recommendation. <i>International Journal of Prognostics and Health Management</i>, <i>4</i>(2)."},"year":"2013","issue":"2","quality_controlled":"1","title":"Application of Event Based Decision Tree and Ensemble of Data Driven Methods for Maintenance Action Recommendation","volume":4,"author":[{"first_name":"James Kuria","last_name":"Kimotho","full_name":"Kimotho, James Kuria"},{"full_name":"Sondermann-Wölke, Chritoph","last_name":"Sondermann-Wölke","first_name":"Chritoph"},{"first_name":"Tobias","last_name":"Meyer","full_name":"Meyer, Tobias"},{"id":"21220","full_name":"Sextro, Walter","last_name":"Sextro","first_name":"Walter"}],"date_created":"2019-05-13T14:15:36Z","date_updated":"2022-01-06T07:04:21Z"},{"citation":{"apa":"Kohl, S., Zuber, A., &#38; Sextro, W. (2013). Modelbased Investigations of Gyroscopic Effect on the (Elasto-)Kinematics of Suspension Systems. In <i>Proc. Appl. Math. Mech.</i> (Vol. 13, pp. 23–24). <a href=\"https://doi.org/10.1002/pamm.201310007\">https://doi.org/10.1002/pamm.201310007</a>","mla":"Kohl, Sergej, et al. “Modelbased Investigations of Gyroscopic Effect on the (Elasto-)Kinematics of Suspension Systems.” <i>Proc. Appl. Math. Mech.</i>, vol. 13, 2013, pp. 23–24, doi:<a href=\"https://doi.org/10.1002/pamm.201310007\">10.1002/pamm.201310007</a>.","short":"S. Kohl, A. Zuber, W. Sextro, in: Proc. Appl. Math. Mech., 2013, pp. 23–24.","bibtex":"@inproceedings{Kohl_Zuber_Sextro_2013, title={Modelbased Investigations of Gyroscopic Effect on the (Elasto-)Kinematics of Suspension Systems}, volume={13}, DOI={<a href=\"https://doi.org/10.1002/pamm.201310007\">10.1002/pamm.201310007</a>}, booktitle={Proc. Appl. Math. Mech.}, author={Kohl, Sergej and Zuber, Armin and Sextro, Walter}, year={2013}, pages={23–24} }","ama":"Kohl S, Zuber A, Sextro W. Modelbased Investigations of Gyroscopic Effect on the (Elasto-)Kinematics of Suspension Systems. In: <i>Proc. Appl. Math. Mech.</i> Vol 13. ; 2013:23-24. doi:<a href=\"https://doi.org/10.1002/pamm.201310007\">10.1002/pamm.201310007</a>","chicago":"Kohl, Sergej, Armin Zuber, and Walter Sextro. “Modelbased Investigations of Gyroscopic Effect on the (Elasto-)Kinematics of Suspension Systems.” In <i>Proc. Appl. Math. Mech.</i>, 13:23–24, 2013. <a href=\"https://doi.org/10.1002/pamm.201310007\">https://doi.org/10.1002/pamm.201310007</a>.","ieee":"S. Kohl, A. Zuber, and W. Sextro, “Modelbased Investigations of Gyroscopic Effect on the (Elasto-)Kinematics of Suspension Systems,” in <i>Proc. Appl. Math. Mech.</i>, 2013, vol. 13, pp. 23–24."},"intvolume":"        13","page":"23-24","year":"2013","date_created":"2019-05-20T11:01:42Z","author":[{"first_name":"Sergej","last_name":"Kohl","full_name":"Kohl, Sergej"},{"first_name":"Armin","full_name":"Zuber, Armin","last_name":"Zuber"},{"last_name":"Sextro","full_name":"Sextro, Walter","id":"21220","first_name":"Walter"}],"volume":13,"date_updated":"2019-05-20T11:03:25Z","doi":"10.1002/pamm.201310007","title":"Modelbased Investigations of Gyroscopic Effect on the (Elasto-)Kinematics of Suspension Systems","type":"conference","publication":"Proc. Appl. Math. Mech.","status":"public","abstract":[{"lang":"eng","text":"During wheel bumping caused by stochastic road excitation, the wheel performs rotational and translational movements. The bump and rebound wheel velocity leads to significant angular velocities based on the (elasto-)kinematics of the suspension system. Based on the gyroscopic effect, moments arise about the rotating wheel induced by the angular change while bumping. Therefore it leads to undesirable wheel changes and degrades the tire contact and finally decreases the driving stability. A flexible MBS-model of the five-link rear axle system that includes these effects has been built up to allow a detailed investigation of the gyroscopic effect. Using the simulation results, conclusions can be drawn for refining design criteria for the kinematics, elastokinematics and topology of the suspension system to increase the active safety of the vehicle"}],"user_id":"55222","department":[{"_id":"151"}],"_id":"9855","language":[{"iso":"eng"}]}]