[{"intvolume":"       295","date_updated":"2023-09-21T14:12:15Z","publication_identifier":{"issn":["0924-4247"]},"author":[{"first_name":"Reinhard","last_name":"Schemmel","full_name":"Schemmel, Reinhard","id":"28647"},{"first_name":"Tobias","last_name":"Hemsel","full_name":"Hemsel, Tobias","id":"210"},{"id":"66833","full_name":"Dymel, Collin","last_name":"Dymel","first_name":"Collin"},{"full_name":"Hunstig, Matthias","first_name":"Matthias","last_name":"Hunstig"},{"last_name":"Brökelmann","first_name":"Michael","full_name":"Brökelmann, Michael"},{"first_name":"Walter","last_name":"Sextro","full_name":"Sextro, Walter","id":"21220"}],"year":"2019","title":"Using complex multi-dimensional vibration trajectories in ultrasonic bonding and welding","doi":"10.1016/j.sna.2019.04.025","language":[{"iso":"eng"}],"abstract":[{"text":"Ultrasonic joining is a common industrial process. In the electronics industry it is used to form electrical connections, including those of dissimilar materials. Multiple influencing factors in ultrasonic joining are known and extensively investigated; process parameters like ultrasonic power, bond force, and bonding frequency of the ultrasonic vibration are known to have a high impact on a reliable joining process and need to be adapted for each new application with different geometry or materials. This contribution is focused on increasing ultrasonic power transmitted to the interface and keeping mechanical stresses during ultrasonic bonding low by using a multi-dimensional ultrasonic transducer concept. Bonding results for a new designed connector pin in IGBT-modules achieved by multi- and one-dimensional bonding are discussed.","lang":"eng"}],"publication":"Sensors and Actuators A: Physical","department":[{"_id":"151"}],"type":"journal_article","keyword":["Ultrasonic bonding","Ultrasonic welding","Multi-dimensional bonding","Complex vibration","Multi-frequent","Two-dimensional friction model"],"date_created":"2019-07-01T07:32:07Z","status":"public","volume":295,"user_id":"210","_id":"10334","page":"653 - 662","project":[{"name":"Hochleistungsbonden in energieeffizienten Leistungshalbleitermodulen","grant_number":"MP-1-1-015","_id":"93"}],"quality_controlled":"1","citation":{"chicago":"Schemmel, Reinhard, Tobias Hemsel, Collin Dymel, Matthias Hunstig, Michael Brökelmann, and Walter Sextro. “Using Complex Multi-Dimensional Vibration Trajectories in Ultrasonic Bonding and Welding.” <i>Sensors and Actuators A: Physical</i> 295 (2019): 653–62. <a href=\"https://doi.org/10.1016/j.sna.2019.04.025\">https://doi.org/10.1016/j.sna.2019.04.025</a>.","short":"R. Schemmel, T. Hemsel, C. Dymel, M. Hunstig, M. Brökelmann, W. Sextro, Sensors and Actuators A: Physical 295 (2019) 653–662.","apa":"Schemmel, R., Hemsel, T., Dymel, C., Hunstig, M., Brökelmann, M., &#38; Sextro, W. (2019). Using complex multi-dimensional vibration trajectories in ultrasonic bonding and welding. <i>Sensors and Actuators A: Physical</i>, <i>295</i>, 653–662. <a href=\"https://doi.org/10.1016/j.sna.2019.04.025\">https://doi.org/10.1016/j.sna.2019.04.025</a>","ieee":"R. Schemmel, T. Hemsel, C. Dymel, M. Hunstig, M. Brökelmann, and W. Sextro, “Using complex multi-dimensional vibration trajectories in ultrasonic bonding and welding,” <i>Sensors and Actuators A: Physical</i>, vol. 295, pp. 653–662, 2019, doi: <a href=\"https://doi.org/10.1016/j.sna.2019.04.025\">10.1016/j.sna.2019.04.025</a>.","ama":"Schemmel R, Hemsel T, Dymel C, Hunstig M, Brökelmann M, Sextro W. Using complex multi-dimensional vibration trajectories in ultrasonic bonding and welding. <i>Sensors and Actuators A: Physical</i>. 2019;295:653-662. doi:<a href=\"https://doi.org/10.1016/j.sna.2019.04.025\">10.1016/j.sna.2019.04.025</a>","bibtex":"@article{Schemmel_Hemsel_Dymel_Hunstig_Brökelmann_Sextro_2019, title={Using complex multi-dimensional vibration trajectories in ultrasonic bonding and welding}, volume={295}, DOI={<a href=\"https://doi.org/10.1016/j.sna.2019.04.025\">10.1016/j.sna.2019.04.025</a>}, journal={Sensors and Actuators A: Physical}, author={Schemmel, Reinhard and Hemsel, Tobias and Dymel, Collin and Hunstig, Matthias and Brökelmann, Michael and Sextro, Walter}, year={2019}, pages={653–662} }","mla":"Schemmel, Reinhard, et al. “Using Complex Multi-Dimensional Vibration Trajectories in Ultrasonic Bonding and Welding.” <i>Sensors and Actuators A: Physical</i>, vol. 295, 2019, pp. 653–62, doi:<a href=\"https://doi.org/10.1016/j.sna.2019.04.025\">10.1016/j.sna.2019.04.025</a>."}},{"date_updated":"2019-09-16T10:23:40Z","author":[{"full_name":"Dunst, Paul","first_name":"Paul","last_name":"Dunst","id":"22130"},{"id":"210","last_name":"Hemsel","first_name":"Tobias","full_name":"Hemsel, Tobias"},{"first_name":"Walter","last_name":"Sextro","full_name":"Sextro, Walter","id":"21220"}],"status":"public","year":"2017","title":"Analysis of pipe vibration in an ultrasonic powder transportationsystem","volume":"Sensors and Actuators A 263","user_id":"55222","_id":"9972","language":[{"iso":"eng"}],"page":"733-736","abstract":[{"text":"The transportation of dry fine powders is an emerging technologic task, as in biotechnology, pharmaceu-tical and coatings industry the particle sizes of processed powders get smaller and smaller. Fine powdersare primarily defined by the fact that adhesive and cohesive forces outweigh the weight forces, leadingto mostly unwanted agglomeration (clumping) and adhesion to surfaces. Thereby it gets more difficult touse conventional conveyor systems (e.g. pneumatic or vibratory conveyors) for transport. A rather newmethod for transporting these fine powders is based on ultrasonic vibrations, which are used to reducefriction between powder and substrate. Within this contribution an experimental set-up consisting of apipe, a solenoid actuator for axial vibration and an annular piezoelectric actuator for the high frequencyradial vibration of the pipe is described. Since amplitudes of the radial pipe vibration should be as large aspossible to get high effects of friction reduction, the pipe is excited to vibrate in resonance. To determinethe optimum excitation frequency and actuator position the vibration modes and resonance frequenciesof the pipe are calculated and measured. Results are in good accordance.","lang":"eng"}],"quality_controlled":"1","citation":{"ama":"Dunst P, Hemsel T, Sextro W. Analysis of pipe vibration in an ultrasonic powder transportationsystem. <i>elsevier</i>. 2017;Sensors and Actuators A 263:733-736.","bibtex":"@article{Dunst_Hemsel_Sextro_2017, title={Analysis of pipe vibration in an ultrasonic powder transportationsystem}, volume={Sensors and Actuators A 263}, journal={elsevier}, author={Dunst, Paul and Hemsel, Tobias and Sextro, Walter}, year={2017}, pages={733–736} }","mla":"Dunst, Paul, et al. “Analysis of Pipe Vibration in an Ultrasonic Powder Transportationsystem.” <i>Elsevier</i>, vol. Sensors and Actuators A 263, 2017, pp. 733–36.","chicago":"Dunst, Paul, Tobias Hemsel, and Walter Sextro. “Analysis of Pipe Vibration in an Ultrasonic Powder Transportationsystem.” <i>Elsevier</i> Sensors and Actuators A 263 (2017): 733–36.","short":"P. Dunst, T. Hemsel, W. Sextro, Elsevier Sensors and Actuators A 263 (2017) 733–736.","apa":"Dunst, P., Hemsel, T., &#38; Sextro, W. (2017). Analysis of pipe vibration in an ultrasonic powder transportationsystem. <i>Elsevier</i>, <i>Sensors and Actuators A 263</i>, 733–736.","ieee":"P. Dunst, T. Hemsel, and W. Sextro, “Analysis of pipe vibration in an ultrasonic powder transportationsystem,” <i>elsevier</i>, vol. Sensors and Actuators A 263, pp. 733–736, 2017."},"publication":"elsevier","department":[{"_id":"151"}],"keyword":["Powder transport Piezoelectrics Ultrasonics Pipe vibration Finite element simulation Fine powder"],"type":"journal_article","date_created":"2019-05-27T09:31:13Z"},{"date_created":"2019-05-27T08:37:22Z","department":[{"_id":"151"}],"keyword":["Contact Mechanics","Viscoelastic Material","Adhesive Friction","Hysteresis Friction","Energy Dissipation","Vibration"],"type":"conference","citation":{"ieee":"F. Schulte, J. Neuhaus, and W. Sextro, “A Mechanical Model for the Dynamical Contact of Elastic Rough Bodies with Viscoelastic Properties,” in <i>Proceedings of ICoEV 2015 International Conference on Engineering Vibration</i>, 2015, pp. 1109–1117.","apa":"Schulte, F., Neuhaus, J., &#38; Sextro, W. (2015). A Mechanical Model for the Dynamical Contact of Elastic Rough Bodies with Viscoelastic Properties. In <i>Proceedings of ICoEV 2015 International Conference on Engineering Vibration</i> (pp. 1109–1117).","chicago":"Schulte, Frank, Jan Neuhaus, and Walter Sextro. “A Mechanical Model for the Dynamical Contact of Elastic Rough Bodies with Viscoelastic Properties.” In <i>Proceedings of ICoEV 2015 International Conference on Engineering Vibration</i>, 1109–17, 2015.","short":"F. Schulte, J. Neuhaus, W. Sextro, in: Proceedings of ICoEV 2015 International Conference on Engineering Vibration, 2015, pp. 1109–1117.","mla":"Schulte, Frank, et al. “A Mechanical Model for the Dynamical Contact of Elastic Rough Bodies with Viscoelastic Properties.” <i>Proceedings of ICoEV 2015 International Conference on Engineering Vibration</i>, 2015, pp. 1109–17.","bibtex":"@inproceedings{Schulte_Neuhaus_Sextro_2015, title={A Mechanical Model for the Dynamical Contact of Elastic Rough Bodies with Viscoelastic Properties}, booktitle={Proceedings of ICoEV 2015 International Conference on Engineering Vibration}, author={Schulte, Frank and Neuhaus, Jan and Sextro, Walter}, year={2015}, pages={1109–1117} }","ama":"Schulte F, Neuhaus J, Sextro W. A Mechanical Model for the Dynamical Contact of Elastic Rough Bodies with Viscoelastic Properties. In: <i>Proceedings of ICoEV 2015 International Conference on Engineering Vibration</i>. ; 2015:1109-1117."},"publication":"Proceedings of ICoEV 2015 International Conference on Engineering Vibration","quality_controlled":"1","abstract":[{"text":"The contact between viscoelastic materials e.g. elastomers and a rough surface leads to a special friction characteristic, which differs greatly in its properties comparing to other materials like metals. In practice, this friction combination occurs for example in the tire-road contact, or in the use of rubber gaskets. Due to the frictional forces a system is significantly influenced in its vibrational properties. The friction force is composed of two main components adhesion and hysteresis. The adhesion results from molecular bounds between the contact partners, while the deformation of the viscoelastic material by the roughness of the counter body leads to power loss. This internal friction results in an additional frictional force, which is described by the hysteresis. To simulate the frictional behaviour of elastomers on rough surfaces and thus to determine the energy dissipation in contact, it is necessary to develop a mechanical model which considers the roughness of the contact partners, as well as dynamic effects and the dependence on normal pressure and sliding speed. The viscoelastic material behaviour must also be considered. The contact between two rough surfaces is modelled as a rough rigid layer contacting a rough elas- tic layer. The elastic layer is modelled by point masses connected by Maxwell-elements. This allows the viscoelastic properties of the elastomer to be considered. The behaviour of whole system can be described by equations of motion with integrated constraints. The degrees of freedom of the model depends on the varying contact conditions. A point mass not in contact has two degrees of freedom. A point mass in contact moving along the roughness path can be described by only one degree of freedom. For each Maxwell-Element also an inner coordinate and thus a further degree of freedom is needed. Because of varying contact conditions dur- ing the simulation, the simulation interrupts in case the contact conditions change. Then the equations of motions are adapted with respect to the contact constraints. As a result of the simulation one obtain the energy dissipation and thus the friction char- acteristic during the friction process. It is possible to use these results in three dimensional point-contact elements in order to model contact surfaces on lager length scales.","lang":"eng"}],"language":[{"iso":"eng"}],"_id":"9952","page":"1109-1117","user_id":"55222","author":[{"full_name":"Schulte, Frank","last_name":"Schulte","first_name":"Frank"},{"full_name":"Neuhaus, Jan","first_name":"Jan","last_name":"Neuhaus"},{"last_name":"Sextro","first_name":"Walter","full_name":"Sextro, Walter","id":"21220"}],"status":"public","title":"A Mechanical Model for the Dynamical Contact of Elastic Rough Bodies with Viscoelastic Properties","year":"2015","date_updated":"2019-09-16T10:47:53Z"},{"keyword":["Noise","Vibration engineering"],"type":"conference","department":[{"_id":"151"}],"date_created":"2019-04-29T08:54:27Z","publication":"Proceedings of ISMA - International conference on noise and vibration engineering","citation":{"apa":"Genzo, A., &#38; Sextro, W. (2006). Dynamic Behaviour of Elastic Bodies Coupled by Extended Friction Contacts. In <i>Proceedings of ISMA - International conference on noise and vibration engineering</i> (pp. 51–52).","ieee":"A. Genzo and W. Sextro, “Dynamic Behaviour of Elastic Bodies Coupled by Extended Friction Contacts,” in <i>Proceedings of ISMA - International conference on noise and vibration engineering</i>, 2006, pp. 51–52.","short":"A. Genzo, W. Sextro, in: Proceedings of ISMA - International Conference on Noise and Vibration Engineering, 2006, pp. 51–52.","chicago":"Genzo, Alexander, and Walter Sextro. “Dynamic Behaviour of Elastic Bodies Coupled by Extended Friction Contacts.” In <i>Proceedings of ISMA - International Conference on Noise and Vibration Engineering</i>, 51–52, 2006.","mla":"Genzo, Alexander, and Walter Sextro. “Dynamic Behaviour of Elastic Bodies Coupled by Extended Friction Contacts.” <i>Proceedings of ISMA - International Conference on Noise and Vibration Engineering</i>, 2006, pp. 51–52.","ama":"Genzo A, Sextro W. Dynamic Behaviour of Elastic Bodies Coupled by Extended Friction Contacts. In: <i>Proceedings of ISMA - International Conference on Noise and Vibration Engineering</i>. ; 2006:51-52.","bibtex":"@inproceedings{Genzo_Sextro_2006, title={Dynamic Behaviour of Elastic Bodies Coupled by Extended Friction Contacts}, booktitle={Proceedings of ISMA - International conference on noise and vibration engineering}, author={Genzo, Alexander and Sextro, Walter}, year={2006}, pages={51–52} }"},"user_id":"55222","page":"51-52","_id":"9535","language":[{"iso":"eng"}],"date_updated":"2022-01-06T07:04:16Z","status":"public","year":"2006","title":"Dynamic Behaviour of Elastic Bodies Coupled by Extended Friction Contacts","author":[{"last_name":"Genzo","first_name":"Alexander","full_name":"Genzo, Alexander"},{"id":"21220","first_name":"Walter","last_name":"Sextro","full_name":"Sextro, Walter"}]},{"keyword":["Turbine blades","Vibration"],"type":"conference","department":[{"_id":"151"}],"place":"Atlanta, Georgia, USA","date_created":"2019-04-15T10:44:50Z","abstract":[{"text":"Numerical predictions of the forced vibration of a disc assembly including frictional effects between the shrouds are presented concerning engineering needs for the blade design process. Assuming a tuned disc assembly, numerical static, free and then forced vibration analyses of a shrouded turbine blade measured in the spin pit are performed systematically. For the excitation forces of an air jet evaluated from the fairly linear behavior of the experimental blade resonance peaks, the reliability of the proposed approach is validated through the very close agreement of the computed and measured resonant peaks. These resonant peaks demonstrate either a fairly linear behavior or a non-linear one like the jump effect of blade resonance amplitudes, or elastic impacts between the shrouds. Also, the damping performance for different contact configurations between the shrouds is numerically analyzed. These numerical results indicate that the shrouds generate higher frictional damping for small angles (0--30 deg) between the circumferential direction and the normal vector to the contact surface. Copyright {\\copyright} 2003 by ASME","lang":"eng"}],"issue":"GT2003-38808","publication":"ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference","citation":{"mla":"Szwedowicz, J., et al. “On Forced Vibration of Shrouded Turbine Blades.” <i>ASME Turbo Expo 2003, Collocated with the 2003 International Joint Power Generation Conference</i>, no. GT2003-38808, 2003, doi:<a href=\"https://doi.org/doi:10.1115/GT2003-38808\">doi:10.1115/GT2003-38808</a>.","apa":"Szwedowicz, J., Sextro, W., Visser, R., &#38; Masserey, P. . (2003). On forced vibration of shrouded turbine blades. In <i>ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference</i>. Atlanta, Georgia, USA. <a href=\"https://doi.org/doi:10.1115/GT2003-38808\">https://doi.org/doi:10.1115/GT2003-38808</a>","ieee":"J. Szwedowicz, W. Sextro, R. Visser, and P. . Masserey, “On forced vibration of shrouded turbine blades,” in <i>ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference</i>, 2003, no. GT2003-38808.","chicago":"Szwedowicz, J, Walter Sextro, R Visser, and P.A Masserey. “On Forced Vibration of Shrouded Turbine Blades.” In <i>ASME Turbo Expo 2003, Collocated with the 2003 International Joint Power Generation Conference</i>. Atlanta, Georgia, USA, 2003. <a href=\"https://doi.org/doi:10.1115/GT2003-38808\">https://doi.org/doi:10.1115/GT2003-38808</a>.","short":"J. Szwedowicz, W. Sextro, R. Visser, P.. Masserey, in: ASME Turbo Expo 2003, Collocated with the 2003 International Joint Power Generation Conference, Atlanta, Georgia, USA, 2003.","ama":"Szwedowicz J, Sextro W, Visser R, Masserey P. On forced vibration of shrouded turbine blades. In: <i>ASME Turbo Expo 2003, Collocated with the 2003 International Joint Power Generation Conference</i>. Atlanta, Georgia, USA; 2003. doi:<a href=\"https://doi.org/doi:10.1115/GT2003-38808\">doi:10.1115/GT2003-38808</a>","bibtex":"@inproceedings{Szwedowicz_Sextro_Visser_Masserey_2003, place={Atlanta, Georgia, USA}, title={On forced vibration of shrouded turbine blades}, DOI={<a href=\"https://doi.org/doi:10.1115/GT2003-38808\">doi:10.1115/GT2003-38808</a>}, number={GT2003-38808}, booktitle={ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference}, author={Szwedowicz, J and Sextro, Walter and Visser, R and Masserey, P.A}, year={2003} }"},"doi":"doi:10.1115/GT2003-38808","user_id":"55222","language":[{"iso":"eng"}],"_id":"8941","date_updated":"2022-01-06T07:04:05Z","status":"public","title":"On forced vibration of shrouded turbine blades","year":"2003","publication_identifier":{"eisbn":["0-7918-3671-1"],"isbn":["0-7918-3687-8"]},"author":[{"full_name":"Szwedowicz, J","last_name":"Szwedowicz","first_name":"J"},{"full_name":"Sextro, Walter","first_name":"Walter","last_name":"Sextro","id":"21220"},{"full_name":"Visser, R","first_name":"R","last_name":"Visser"},{"full_name":"Masserey, P.A","last_name":"Masserey","first_name":"P.A"}]}]