[{"status":"public","abstract":[{"lang":"eng","text":"Rubber-metal bushings (RMB) are critical components in multi-body systems, such as vehicles and industrial machinery, due to their ability to enable relative motion, dampen vibrations, and transmit forces. However, their nonlinear behavior challenges accurate modeling. Traditional physics-based models often fail to balance simplicity, accuracy, and computational efficiency. The growing availability of experimental data offers opportunities to improve RMB modeling through hybrid and data-driven approaches. This study evaluates physics-based, hybrid, and data-driven methods based on predictive accuracy, modeling effort, and computational cost. Hybrid approaches, combining machine learning techniques with physics-based models, are investigated to leverage their complementary strengths. Results show that hybrid methods enhance accuracy for simpler models with a modest increase in computational time. This highlights their potential to simplify RMB modeling while balancing accuracy and efficiency, offering insights for advancing multi-body system simulations. Building on these insights, data-driven methods are explored for their ability to provide surrogate models for dynamical systems without requiring expert knowledge. Experiments reveal that while simple data-driven methods approximate system behavior when data has low variance, they fail with trajectories of widely varying frequency and amplitude."}],"publication":"Multibody System Dynamics","type":"journal_article","language":[{"iso":"eng"}],"department":[{"_id":"151"}],"user_id":"43991","_id":"63765","page":"1–21","citation":{"chicago":"Wohlleben, Meike Claudia, Jan Schütte, Manuel Bastian Berkemeier, Walter Sextro, and Sebastian Peitz. “Evaluating Physics-Based, Hybrid, and Data-Driven Models for Rubber-Metal Bushings.” Multibody System Dynamics, 2026, 1–21. https://doi.org/10.1007/s11044-026-10146-9.","ieee":"M. C. Wohlleben, J. Schütte, M. B. Berkemeier, W. Sextro, and S. Peitz, “Evaluating Physics-Based, Hybrid, and Data-Driven Models for Rubber-Metal Bushings,” Multibody System Dynamics, pp. 1–21, 2026, doi: 10.1007/s11044-026-10146-9.","bibtex":"@article{Wohlleben_Schütte_Berkemeier_Sextro_Peitz_2026, title={Evaluating Physics-Based, Hybrid, and Data-Driven Models for Rubber-Metal Bushings}, DOI={10.1007/s11044-026-10146-9}, journal={Multibody System Dynamics}, author={Wohlleben, Meike Claudia and Schütte, Jan and Berkemeier, Manuel Bastian and Sextro, Walter and Peitz, Sebastian}, year={2026}, pages={1–21} }","short":"M.C. Wohlleben, J. Schütte, M.B. Berkemeier, W. Sextro, S. Peitz, Multibody System Dynamics (2026) 1–21.","mla":"Wohlleben, Meike Claudia, et al. “Evaluating Physics-Based, Hybrid, and Data-Driven Models for Rubber-Metal Bushings.” Multibody System Dynamics, 2026, pp. 1–21, doi:10.1007/s11044-026-10146-9.","ama":"Wohlleben MC, Schütte J, Berkemeier MB, Sextro W, Peitz S. Evaluating Physics-Based, Hybrid, and Data-Driven Models for Rubber-Metal Bushings. Multibody System Dynamics. Published online 2026:1–21. doi:10.1007/s11044-026-10146-9","apa":"Wohlleben, M. C., Schütte, J., Berkemeier, M. B., Sextro, W., & Peitz, S. (2026). Evaluating Physics-Based, Hybrid, and Data-Driven Models for Rubber-Metal Bushings. Multibody System Dynamics, 1–21. https://doi.org/10.1007/s11044-026-10146-9"},"year":"2026","publication_identifier":{"issn":["1384-5640"]},"quality_controlled":"1","doi":"10.1007/s11044-026-10146-9","title":"Evaluating Physics-Based, Hybrid, and Data-Driven Models for Rubber-Metal Bushings","author":[{"first_name":"Meike Claudia","id":"43991","full_name":"Wohlleben, Meike Claudia","orcid":"0009-0009-9767-7168","last_name":"Wohlleben"},{"first_name":"Jan","orcid":"0000-0001-9025-9742","last_name":"Schütte","full_name":"Schütte, Jan","id":"22109"},{"first_name":"Manuel Bastian","last_name":"Berkemeier","full_name":"Berkemeier, Manuel Bastian"},{"first_name":"Walter","last_name":"Sextro","id":"21220","full_name":"Sextro, Walter"},{"first_name":"Sebastian","last_name":"Peitz","full_name":"Peitz, Sebastian"}],"date_created":"2026-01-27T15:51:55Z","date_updated":"2026-03-03T06:31:03Z"},{"language":[{"iso":"ger"}],"publication":"Tagungsband Rad-Schiene-Tagung 2026","title":"Methodik zur Untersuchung der Fahrwerksparameter von Schienenfahrzeugen auf Basis optischer Schwingungsmessungen an einer ortsfesten Messstelle","date_created":"2026-03-04T10:26:27Z","publisher":"DVV Media Group GmbH - Eurailpress","corporate_editor":["Hochschule für Technik und Wirtschaft Dresden, Fakultät Maschinenbau"],"year":"2026","department":[{"_id":"151"}],"user_id":"70188","_id":"64826","project":[{"_id":"1355","name":"enableATO – Automatisierter Bahnverkehr als Backbone für eine nachhaltige, vernetzte Mobilität im ländlichen Raum"}],"status":"public","popular_science":"1","type":"conference","conference":{"name":"21. Internationale Schienenfahrzeugtagung Dresden 4.-6. März 2026","start_date":"2026-03-04","end_date":"2026-03-06","location":"Dresden"},"author":[{"last_name":"Kelber","id":"70188","full_name":"Kelber, Max","first_name":"Max"},{"first_name":"Steffen","full_name":"Brück, Steffen","last_name":"Brück"},{"first_name":"Nishant","full_name":"Bhardwaj, Nishant","last_name":"Bhardwaj"},{"first_name":"Osarenren Kennedy","last_name":"Aimiyekagbon","id":"9557","full_name":"Aimiyekagbon, Osarenren Kennedy"},{"full_name":"Naumann, Rolf","last_name":"Naumann","first_name":"Rolf"},{"first_name":"Walter","id":"21220","full_name":"Sextro, Walter","last_name":"Sextro"}],"date_updated":"2026-03-04T10:38:28Z","page":"206 – 208","citation":{"apa":"Kelber, M., Brück, S., Bhardwaj, N., Aimiyekagbon, O. K., Naumann, R., & Sextro, W. (2026). Methodik zur Untersuchung der Fahrwerksparameter von Schienenfahrzeugen auf Basis optischer Schwingungsmessungen an einer ortsfesten Messstelle. In Hochschule für Technik und Wirtschaft Dresden, Fakultät Maschinenbau (Ed.), Tagungsband Rad-Schiene-Tagung 2026 (pp. 206 – 208). DVV Media Group GmbH - Eurailpress.","bibtex":"@inproceedings{Kelber_Brück_Bhardwaj_Aimiyekagbon_Naumann_Sextro_2026, place={Hamburg}, title={Methodik zur Untersuchung der Fahrwerksparameter von Schienenfahrzeugen auf Basis optischer Schwingungsmessungen an einer ortsfesten Messstelle}, booktitle={Tagungsband Rad-Schiene-Tagung 2026}, publisher={DVV Media Group GmbH - Eurailpress}, author={Kelber, Max and Brück, Steffen and Bhardwaj, Nishant and Aimiyekagbon, Osarenren Kennedy and Naumann, Rolf and Sextro, Walter}, editor={Hochschule für Technik und Wirtschaft Dresden, Fakultät Maschinenbau}, year={2026}, pages={206 – 208} }","short":"M. Kelber, S. Brück, N. Bhardwaj, O.K. Aimiyekagbon, R. Naumann, W. Sextro, in: Hochschule für Technik und Wirtschaft Dresden, Fakultät Maschinenbau (Ed.), Tagungsband Rad-Schiene-Tagung 2026, DVV Media Group GmbH - Eurailpress, Hamburg, 2026, pp. 206 – 208.","mla":"Kelber, Max, et al. “Methodik zur Untersuchung der Fahrwerksparameter von Schienenfahrzeugen auf Basis optischer Schwingungsmessungen an einer ortsfesten Messstelle.” Tagungsband Rad-Schiene-Tagung 2026, edited by Hochschule für Technik und Wirtschaft Dresden, Fakultät Maschinenbau, DVV Media Group GmbH - Eurailpress, 2026, pp. 206 – 208.","ama":"Kelber M, Brück S, Bhardwaj N, Aimiyekagbon OK, Naumann R, Sextro W. Methodik zur Untersuchung der Fahrwerksparameter von Schienenfahrzeugen auf Basis optischer Schwingungsmessungen an einer ortsfesten Messstelle. In: Hochschule für Technik und Wirtschaft Dresden, Fakultät Maschinenbau, ed. Tagungsband Rad-Schiene-Tagung 2026. DVV Media Group GmbH - Eurailpress; 2026:206 – 208.","ieee":"M. Kelber, S. Brück, N. Bhardwaj, O. K. Aimiyekagbon, R. Naumann, and W. Sextro, “Methodik zur Untersuchung der Fahrwerksparameter von Schienenfahrzeugen auf Basis optischer Schwingungsmessungen an einer ortsfesten Messstelle,” in Tagungsband Rad-Schiene-Tagung 2026, Dresden, 2026, pp. 206 – 208.","chicago":"Kelber, Max, Steffen Brück, Nishant Bhardwaj, Osarenren Kennedy Aimiyekagbon, Rolf Naumann, and Walter Sextro. “Methodik zur Untersuchung der Fahrwerksparameter von Schienenfahrzeugen auf Basis optischer Schwingungsmessungen an einer ortsfesten Messstelle.” In Tagungsband Rad-Schiene-Tagung 2026, edited by Hochschule für Technik und Wirtschaft Dresden, Fakultät Maschinenbau, 206 – 208. Hamburg: DVV Media Group GmbH - Eurailpress, 2026."},"place":"Hamburg","publication_identifier":{"isbn":["978-3-96892-332-1"]},"publication_status":"published"},{"main_file_link":[{"open_access":"1","url":"https://www.mdpi.com/2076-0825/14/2/55"}],"doi":"10.3390/act14020055","date_updated":"2025-02-04T13:46:41Z","oa":"1","author":[{"last_name":"Scheidemann","full_name":"Scheidemann, Claus","id":"38259","first_name":"Claus"},{"last_name":"Bornmann","full_name":"Bornmann, Peter","first_name":"Peter"},{"last_name":"Littmann","full_name":"Littmann, Walter","first_name":"Walter"},{"id":"210","full_name":"Hemsel, Tobias","last_name":"Hemsel","first_name":"Tobias"}],"volume":14,"citation":{"apa":"Scheidemann, C., Bornmann, P., Littmann, W., & Hemsel, T. (2025). Lead-Free Ceramics in Prestressed Ultrasonic Transducers. Actuators, 14(2), Article 55. https://doi.org/10.3390/act14020055","bibtex":"@article{Scheidemann_Bornmann_Littmann_Hemsel_2025, title={Lead-Free Ceramics in Prestressed Ultrasonic Transducers}, volume={14}, DOI={10.3390/act14020055}, number={255}, journal={Actuators}, publisher={MDPI AG}, author={Scheidemann, Claus and Bornmann, Peter and Littmann, Walter and Hemsel, Tobias}, year={2025} }","mla":"Scheidemann, Claus, et al. “Lead-Free Ceramics in Prestressed Ultrasonic Transducers.” Actuators, vol. 14, no. 2, 55, MDPI AG, 2025, doi:10.3390/act14020055.","short":"C. Scheidemann, P. Bornmann, W. Littmann, T. Hemsel, Actuators 14 (2025).","ama":"Scheidemann C, Bornmann P, Littmann W, Hemsel T. Lead-Free Ceramics in Prestressed Ultrasonic Transducers. Actuators. 2025;14(2). doi:10.3390/act14020055","chicago":"Scheidemann, Claus, Peter Bornmann, Walter Littmann, and Tobias Hemsel. “Lead-Free Ceramics in Prestressed Ultrasonic Transducers.” Actuators 14, no. 2 (2025). https://doi.org/10.3390/act14020055.","ieee":"C. Scheidemann, P. Bornmann, W. Littmann, and T. Hemsel, “Lead-Free Ceramics in Prestressed Ultrasonic Transducers,” Actuators, vol. 14, no. 2, Art. no. 55, 2025, doi: 10.3390/act14020055."},"intvolume":" 14","publication_status":"published","publication_identifier":{"issn":["2076-0825"]},"article_number":"55","article_type":"original","_id":"58510","user_id":"210","department":[{"_id":"151"}],"status":"public","type":"journal_article","title":"Lead-Free Ceramics in Prestressed Ultrasonic Transducers","publisher":"MDPI AG","date_created":"2025-02-04T13:43:23Z","year":"2025","quality_controlled":"1","issue":"2","language":[{"iso":"eng"}],"abstract":[{"text":"Today’s ultrasonic transducers find broad application in diverse technology branches and most often cannot be replaced by other actuators. They are typically based on lead-containing piezoelectric ceramics. These should be replaced for environmental and health issues by lead-free alternatives. Multiple material alternatives are already known, but there is a lack of information about their technological readiness level. To fill this gap, a small series of prestressed longitudinally vibrating transducers was set up with a standard PZT material and two lead-free variants within this study. The entire process for building the transducers is documented: characteristics of individual ring ceramics, burn-in results, and free vibration and characteristics under load are shown. The main result is that the investigated lead-free materials are ready to use within ultrasonic bolted Langevin transducers (BLTs) for medium-power applications, when the geometrical setup of the transducer is adopted. Since lead-free ceramics need higher voltages to achieve the same power level, the driving electronics or the mechanical setup must be altered specifically for each material. Lower self-heating of the lead-free materials might be attractive for heat-sensitive processes.","lang":"eng"}],"publication":"Actuators"},{"year":"2025","citation":{"ama":"Aimiyekagbon OK, Löwen A, Hanselle R, Rief T, Beck M, Sextro W. Multilevel fault diagnostics for railway applications using limited historical data. In: PHM Society Asia-Pacific Conference. Vol 5. ; 2025. doi:10.36001/phmap.2025.v5i1.4449","apa":"Aimiyekagbon, O. K., Löwen, A., Hanselle, R., Rief, T., Beck, M., & Sextro, W. (2025). Multilevel fault diagnostics for railway applications using limited historical data. PHM Society Asia-Pacific Conference, 5, Article 1. https://doi.org/10.36001/phmap.2025.v5i1.4449","bibtex":"@inproceedings{Aimiyekagbon_Löwen_Hanselle_Rief_Beck_Sextro_2025, title={Multilevel fault diagnostics for railway applications using limited historical data}, volume={5}, DOI={10.36001/phmap.2025.v5i1.4449}, number={1}, booktitle={PHM Society Asia-Pacific Conference}, author={Aimiyekagbon, Osarenren Kennedy and Löwen, Alexander and Hanselle, Raphael and Rief, Thomas and Beck, Maximilian and Sextro, Walter}, year={2025} }","short":"O.K. Aimiyekagbon, A. Löwen, R. Hanselle, T. Rief, M. Beck, W. Sextro, in: PHM Society Asia-Pacific Conference, 2025.","mla":"Aimiyekagbon, Osarenren Kennedy, et al. “Multilevel Fault Diagnostics for Railway Applications Using Limited Historical Data.” PHM Society Asia-Pacific Conference, vol. 5, 1, 2025, doi:10.36001/phmap.2025.v5i1.4449.","chicago":"Aimiyekagbon, Osarenren Kennedy, Alexander Löwen, Raphael Hanselle, Thomas Rief, Maximilian Beck, and Walter Sextro. “Multilevel Fault Diagnostics for Railway Applications Using Limited Historical Data.” In PHM Society Asia-Pacific Conference, Vol. 5, 2025. https://doi.org/10.36001/phmap.2025.v5i1.4449.","ieee":"O. K. Aimiyekagbon, A. Löwen, R. Hanselle, T. Rief, M. Beck, and W. Sextro, “Multilevel fault diagnostics for railway applications using limited historical data,” in PHM Society Asia-Pacific Conference, 2025, vol. 5, doi: 10.36001/phmap.2025.v5i1.4449."},"intvolume":" 5","publication_status":"published","quality_controlled":"1","title":"Multilevel fault diagnostics for railway applications using limited historical data","doi":"10.36001/phmap.2025.v5i1.4449","date_updated":"2026-02-27T20:46:44Z","date_created":"2026-02-27T20:41:54Z","author":[{"id":"9557","full_name":"Aimiyekagbon, Osarenren Kennedy","last_name":"Aimiyekagbon","first_name":"Osarenren Kennedy"},{"id":"47233","full_name":"Löwen, Alexander","last_name":"Löwen","first_name":"Alexander"},{"first_name":"Raphael","last_name":"Hanselle","full_name":"Hanselle, Raphael"},{"first_name":"Thomas","full_name":"Rief, Thomas","last_name":"Rief"},{"first_name":"Maximilian","full_name":"Beck, Maximilian","last_name":"Beck"},{"first_name":"Walter","id":"21220","full_name":"Sextro, Walter","last_name":"Sextro"}],"volume":5,"abstract":[{"lang":"eng","text":"This study proposes a fault diagnostics methodology that addresses the challenges posed by highly imbalanced datasets typical of railway applications, where faulty conditions constitute the minority class. Fault diagnostics is performed from the component level upward, considering each sensor’s proximity to its respective critical component. Advanced signal analysis, feature engineering, and automated data-driven model generation techniques were explored to achieve comprehensive diagnostics, such that the model development process accounts for variations in the operating conditions and differing levels of information availability. The proposed methodology is evaluated on datasets from the MONOCAB, for scenarios with limited faulty instances and on the Beijing 2024 IEEE PHM Conference data challenge, which focused on fault diagnostics of railway systems under various fault modes and operating conditions."}],"status":"public","type":"conference","publication":"PHM Society Asia-Pacific Conference","article_number":"1","keyword":["MONOCAB","Beijing Data Challenge","Diagnostics of railway systems"],"language":[{"iso":"eng"}],"project":[{"name":"enableATO – Automatisierter Bahnverkehr als Backbone für eine nachhaltige, vernetzte Mobilität im ländlichen Raum","_id":"1355"}],"_id":"64787","user_id":"9557","department":[{"_id":"151"}]},{"language":[{"iso":"eng"}],"file_date_updated":"2026-03-02T11:00:37Z","ddc":["620"],"keyword":["lead free piezoelectric ceramics","bolted Langevin transducer","medium power ultrasound."],"user_id":"210","department":[{"_id":"151"}],"_id":"64798","file":[{"file_id":"64799","file_name":"IWPMA_2025_Hemsel.pdf","access_level":"open_access","file_size":1812289,"date_created":"2026-03-02T10:37:46Z","creator":"hemsel","date_updated":"2026-03-02T11:00:37Z","relation":"main_file","content_type":"application/pdf"}],"status":"public","abstract":[{"lang":"eng","text":"Lead-containing piezoelectric ceramics are still the base for today’s ultrasonic transducers used in broad applications. This is partly due to missing powerful lead-free piezoelectric ceramic parts in the commercial market. There has been much research on lead-free materials but developing them into marketable parts seems to be an ongoing process. The actual exemption of ROHS has expired, but as the new exemption has already been requested, ceramic suppliers keep on selling lead containing products. Nevertheless, these should be replaced by lead-free alternatives for environmental and health issues. \r\nThis contribution focuses on exploring the technological readiness level of lead-free hard piezoceramics for prestressed ultrasonic transducers. A small series of bolted Langevin transducers was set up with standard PZT material and three commercial lead-free variants. Results of the building process from individual ring ceramic characteristics to transducer load tests are presented. The main finding of this study is that the lead-free materials technically can compete with the standard PZT for medium-power applications. Some adaptations in the ultrasonic system must be done: the geometry must be altered to fit resonance frequency, and higher voltages or thinner ceramics are needed to achieve the same vibration level at low load. For reaching same power, the volume of lead-free ceramics must be 1.5 to 3 times larger. As already promoted in literature, mechanical losses at high vibration levels are smaller for the lead-free materials. This might help to argument lead-free piezoelectric materials in some applications.\r\n\r\nReferences\r\n1.\tDirective 2011/65/EU of the European Parliament and of the Council of 8 June 2011 on the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment. EUR-Lex Document 02011L0065-20240801. Available online: http://data.europa.eu/eli/dir/2011/65/2024-08-01 (accessed on 24 January 2025).\r\n2.\tLangevin, P. (1918) Method and Apparatus for Transmitting and Receiving Submarine Elastic Waves Using the Piezoelectric Properties of Quartz. French Patent Office; Patent No. FR505703.\r\n3.\tHemsel, T.; Twiefel, J. (2023) Piezoelectric Ultrasonic Power Transducers. In Encyclopedia of Materials: Electronics; Academic Press: Oxford, UK; pp. 276–285. https://doi.org/10.1016/b978-0-12-819728-8.00047-4.\r\n4.\tATHENA Technologie Beratung GmbH (2025) Description of Ultrasound Generator. Available online: http://shop.myathena.de/epages/12074748.sf/de_DE/?ObjectPath=/Shops/12074748/Products/AM200 (accessed on 13 January 2025).\r\n5.\tLittmann, W.; Hemsel, T.; Kauczor, C.; Wallaschek, J.; Sinha, W. (2003) Load-adaptive phase-controller for resonant driven piezoelectric devices. Proc. World Congr. Ultrason. 2003, 48, 547–550.\r\n6.\tScheidemann, C., Bornmann, P., Littmann, W., & Hemsel, T. (2025). Lead-Free Ceramics in Prestressed Ultrasonic Transducers. Actuators, 14(2), 55. https://doi.org/10.3390/act14020055\r\n"}],"type":"conference","conference":{"location":"Vilnius, Lithuania","end_date":"2025-07-03","start_date":"2025-07-01","name":"International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA)"},"title":"Bolted Langevin transducers with leadfree piezoelectric ceramics","author":[{"first_name":"Claus","id":"38259","full_name":"Scheidemann, Claus","last_name":"Scheidemann"},{"last_name":"Bornmann","full_name":"Bornmann, Peter","first_name":"Peter"},{"first_name":"Walter","full_name":"Littmann, Walter","last_name":"Littmann"},{"full_name":"Hemsel, Tobias","id":"210","last_name":"Hemsel","first_name":"Tobias"}],"date_created":"2026-03-02T10:39:40Z","date_updated":"2026-03-02T11:04:56Z","oa":"1","citation":{"apa":"Scheidemann, C., Bornmann, P., Littmann, W., & Hemsel, T. (2025). Bolted Langevin transducers with leadfree piezoelectric ceramics. International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA), Vilnius, Lithuania.","bibtex":"@inproceedings{Scheidemann_Bornmann_Littmann_Hemsel_2025, title={Bolted Langevin transducers with leadfree piezoelectric ceramics}, author={Scheidemann, Claus and Bornmann, Peter and Littmann, Walter and Hemsel, Tobias}, year={2025} }","short":"C. Scheidemann, P. Bornmann, W. Littmann, T. Hemsel, in: 2025.","mla":"Scheidemann, Claus, et al. Bolted Langevin Transducers with Leadfree Piezoelectric Ceramics. 2025.","chicago":"Scheidemann, Claus, Peter Bornmann, Walter Littmann, and Tobias Hemsel. “Bolted Langevin Transducers with Leadfree Piezoelectric Ceramics,” 2025.","ieee":"C. Scheidemann, P. Bornmann, W. Littmann, and T. Hemsel, “Bolted Langevin transducers with leadfree piezoelectric ceramics,” presented at the International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA), Vilnius, Lithuania, 2025.","ama":"Scheidemann C, Bornmann P, Littmann W, Hemsel T. Bolted Langevin transducers with leadfree piezoelectric ceramics. In: ; 2025."},"year":"2025","has_accepted_license":"1"},{"date_created":"2026-03-02T10:47:48Z","author":[{"first_name":"Tobias","id":"210","full_name":"Hemsel, Tobias","last_name":"Hemsel"},{"first_name":"Claus","full_name":"Scheidemann, Claus","id":"38259","last_name":"Scheidemann"},{"full_name":"Bornmann, Peter","last_name":"Bornmann","first_name":"Peter"},{"first_name":"Walter","last_name":"Littmann","full_name":"Littmann, Walter"},{"id":"21220","full_name":"Sextro, Walter","last_name":"Sextro","first_name":"Walter"}],"date_updated":"2026-03-02T10:58:37Z","oa":"1","conference":{"location":"Paderborn, Germany","end_date":"2025-09-25","start_date":"2025-09-21","name":"International Congress on Ultrasonics (ICU)"},"title":"Intensive ultrasonic cleaning of surfaces by means of lead-free ultrasonic transducer with focussing sonotrode","has_accepted_license":"1","citation":{"chicago":"Hemsel, Tobias, Claus Scheidemann, Peter Bornmann, Walter Littmann, and Walter Sextro. “Intensive Ultrasonic Cleaning of Surfaces by Means of Lead-Free Ultrasonic Transducer with Focussing Sonotrode,” 2025.","ieee":"T. Hemsel, C. Scheidemann, P. Bornmann, W. Littmann, and W. Sextro, “Intensive ultrasonic cleaning of surfaces by means of lead-free ultrasonic transducer with focussing sonotrode,” presented at the International Congress on Ultrasonics (ICU), Paderborn, Germany, 2025.","short":"T. Hemsel, C. Scheidemann, P. Bornmann, W. Littmann, W. Sextro, in: 2025.","bibtex":"@inproceedings{Hemsel_Scheidemann_Bornmann_Littmann_Sextro_2025, title={Intensive ultrasonic cleaning of surfaces by means of lead-free ultrasonic transducer with focussing sonotrode}, author={Hemsel, Tobias and Scheidemann, Claus and Bornmann, Peter and Littmann, Walter and Sextro, Walter}, year={2025} }","mla":"Hemsel, Tobias, et al. Intensive Ultrasonic Cleaning of Surfaces by Means of Lead-Free Ultrasonic Transducer with Focussing Sonotrode. 2025.","ama":"Hemsel T, Scheidemann C, Bornmann P, Littmann W, Sextro W. Intensive ultrasonic cleaning of surfaces by means of lead-free ultrasonic transducer with focussing sonotrode. In: ; 2025.","apa":"Hemsel, T., Scheidemann, C., Bornmann, P., Littmann, W., & Sextro, W. (2025). Intensive ultrasonic cleaning of surfaces by means of lead-free ultrasonic transducer with focussing sonotrode. International Congress on Ultrasonics (ICU), Paderborn, Germany."},"year":"2025","department":[{"_id":"151"}],"user_id":"210","_id":"64800","file_date_updated":"2026-03-02T10:58:37Z","language":[{"iso":"eng"}],"ddc":["620"],"type":"conference","status":"public","file":[{"creator":"hemsel","date_created":"2026-03-02T10:46:43Z","date_updated":"2026-03-02T10:58:37Z","file_name":"ICU_2025_Hemsel.pdf","access_level":"open_access","file_id":"64801","file_size":1946202,"content_type":"application/pdf","relation":"main_file"}],"abstract":[{"text":"Intensive ultrasonic cleaning of surfaces by means of a lead-free ultrasonic transducer with focusing sonotrode\r\nUltrasonic cleaning baths are probably a coincidental development: After underwater sonars had already been successfully used to detect submarines before 1920, it was probably observed in this environment that the ultrasonic oscillators not only showed a self-cleaning effect but also cavitation damage. At the beginning of the 1950s, the first ultrasonic cleaning devices finally came onto the market. Today, the range of applications ranges from household appliances for jewellery and eyewear cleaning to classic cleaning baths for metal parts and systems for cleaning highly sensitive electronic components. There is a certain gap in handheld, mobile cleaning equipment. Although devices for spot cleaning of textiles are known, the cleaning effect is usually low. \r\nDue to the directive 2011/65/EU on the restriction of the use of hazardous substances in electrical and electronic equipment (RoHS) [1] lead should no longer be used in technical devices. As today’s standard ceramics for medium and high-power ultrasonic transducers typically contain lead, there is a need to explore the use of lead-free ceramics in this field. Honda [2] already offers a cleaning transducer based on lead-free piezoelectric ceramics, but it is designed to be used in cleaning baths.\r\nThis article presents the model-based development of a highly innovative ultrasonic cleaner. On the one hand, lead-free piezoelectric ceramics are used, and on the other hand, a special sonotrode has been developed that concentrates the sound in such a way that a strong cavitation and thus cleaning effect is achieved with comparatively low power in a short time. Coupled field finite element method was used to find an appropriate geometry for the focussing sonotrode. The comparison of simulation and measurement results shows that the lead-free piezoceramics used do their job well and can keep up with standard ceramics, but more ceramic volume is needed to achieve same power. An advanced control concept was elaborated to ensure continuous hard cavitation at varying distances between the sonotrode and the part to be cleaned. Cleaning results for different surfaces and contaminations are presented. The concept of the focusing sonotrode shows that a convincing cleaning result can be achieved even with low power and in short time, provided that the oscillation system and control electronics are suitably coordinated.\r\n\r\nReferences\r\n[1] http://data.europa.eu/eli/dir/2011/65/2024-08-01 \r\n[2] https://en.honda-el.co.jp/product/ceramics/lineup/lead_off/lead-off \r\n","lang":"eng"}]},{"has_accepted_license":"1","citation":{"ieee":"C. Scheidemann, T. Hemsel, and W. Sextro, “Time dependent material characteristics of prestressed piezoelectric ceramics in langevin transducers,” presented at the 22nd International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA), Vilnius, Lithuania, 2025.","chicago":"Scheidemann, Claus, Tobias Hemsel, and Walter Sextro. “Time Dependent Material Characteristics of Prestressed Piezoelectric Ceramics in Langevin Transducers,” 2025.","mla":"Scheidemann, Claus, et al. Time Dependent Material Characteristics of Prestressed Piezoelectric Ceramics in Langevin Transducers. 2025.","short":"C. Scheidemann, T. Hemsel, W. Sextro, in: 2025.","bibtex":"@inproceedings{Scheidemann_Hemsel_Sextro_2025, title={Time dependent material characteristics of prestressed piezoelectric ceramics in langevin transducers}, author={Scheidemann, Claus and Hemsel, Tobias and Sextro, Walter}, year={2025} }","ama":"Scheidemann C, Hemsel T, Sextro W. Time dependent material characteristics of prestressed piezoelectric ceramics in langevin transducers. In: ; 2025.","apa":"Scheidemann, C., Hemsel, T., & Sextro, W. (2025). Time dependent material characteristics of prestressed piezoelectric ceramics in langevin transducers. 22nd International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA), Vilnius, Lithuania."},"year":"2025","author":[{"id":"38259","full_name":"Scheidemann, Claus","last_name":"Scheidemann","first_name":"Claus"},{"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":"2025-10-08T14:22:32Z","oa":"1","date_updated":"2026-03-02T10:59:53Z","conference":{"name":"22nd International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA)","start_date":"2025-07-1","end_date":"2025-07-3","location":"Vilnius, Lithuania"},"title":"Time dependent material characteristics of prestressed piezoelectric ceramics in langevin transducers","type":"conference","status":"public","file":[{"file_size":644147,"file_id":"63817","file_name":"SHS25_IWPMA_2025.pdf","access_level":"open_access","date_updated":"2026-03-02T10:59:53Z","creator":"hemsel","date_created":"2026-01-30T11:07:48Z","relation":"main_file","content_type":"application/pdf"}],"department":[{"_id":"151"}],"user_id":"210","_id":"61755","project":[{"name":"FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken für Leistungsschallanwendungen (NEPTUN)","_id":"245"}],"file_date_updated":"2026-03-02T10:59:53Z","language":[{"iso":"eng"}],"ddc":["620"]},{"ddc":["620"],"file_date_updated":"2026-03-02T10:59:36Z","language":[{"iso":"eng"}],"_id":"61757","project":[{"_id":"245","name":"FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken für Leistungsschallanwendungen (NEPTUN)"}],"department":[{"_id":"151"}],"user_id":"210","status":"public","file":[{"file_size":783790,"access_level":"open_access","file_name":"Sch25_ICU_2025.pdf","file_id":"63816","date_updated":"2026-03-02T10:59:36Z","creator":"hemsel","date_created":"2026-01-30T07:30:44Z","relation":"main_file","content_type":"application/pdf"}],"type":"conference","title":"Investigation of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers","conference":{"end_date":"2025-09-25","location":"Paderborn, Germany","name":"2025 International Congress on Ultrasonics (ICU)","start_date":"2025-09-21"},"oa":"1","date_updated":"2026-03-02T10:59:36Z","date_created":"2025-10-08T14:33:44Z","author":[{"first_name":"Claus","full_name":"Scheidemann, Claus","id":"38259","last_name":"Scheidemann"},{"first_name":"Julius","full_name":"Porzenheim, Julius","last_name":"Porzenheim"},{"first_name":"Tobias","last_name":"Hemsel","id":"210","full_name":"Hemsel, Tobias"},{"first_name":"Walter","last_name":"Sextro","id":"21220","full_name":"Sextro, Walter"}],"year":"2025","citation":{"mla":"Scheidemann, Claus, et al. Investigation of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers. 2025.","short":"C. Scheidemann, J. Porzenheim, T. Hemsel, W. Sextro, in: 2025.","bibtex":"@inproceedings{Scheidemann_Porzenheim_Hemsel_Sextro_2025, title={Investigation of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers}, author={Scheidemann, Claus and Porzenheim, Julius and Hemsel, Tobias and Sextro, Walter}, year={2025} }","apa":"Scheidemann, C., Porzenheim, J., Hemsel, T., & Sextro, W. (2025). Investigation of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers. 2025 International Congress on Ultrasonics (ICU), Paderborn, Germany.","ama":"Scheidemann C, Porzenheim J, Hemsel T, Sextro W. Investigation of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers. In: ; 2025.","chicago":"Scheidemann, Claus, Julius Porzenheim, Tobias Hemsel, and Walter Sextro. “Investigation of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers,” 2025.","ieee":"C. Scheidemann, J. Porzenheim, T. Hemsel, and W. Sextro, “Investigation of the Setting Behaviour of Mechanically Biased Piezoelectric Ultrasonic Transducers,” presented at the 2025 International Congress on Ultrasonics (ICU), Paderborn, Germany, 2025."},"has_accepted_license":"1"},{"place":"Cham","year":"2025","citation":{"short":"A.C. Amakor, M.B. Berkemeier, M.C. Wohlleben, W. Sextro, S. Peitz, in: Lecture Notes in Computer Science, Springer Nature Switzerland, Cham, 2025.","bibtex":"@inbook{Amakor_Berkemeier_Wohlleben_Sextro_Peitz_2025, place={Cham}, title={Surrogate-Assisted Multi-objective Design of Complex Multibody Systems}, DOI={10.1007/978-3-032-04555-3_21}, booktitle={Lecture Notes in Computer Science}, publisher={Springer Nature Switzerland}, author={Amakor, Augustina C. and Berkemeier, Manuel B. and Wohlleben, Meike Claudia and Sextro, Walter and Peitz, Sebastian}, year={2025} }","mla":"Amakor, Augustina C., et al. “Surrogate-Assisted Multi-Objective Design of Complex Multibody Systems.” Lecture Notes in Computer Science, Springer Nature Switzerland, 2025, doi:10.1007/978-3-032-04555-3_21.","apa":"Amakor, A. C., Berkemeier, M. B., Wohlleben, M. C., Sextro, W., & Peitz, S. (2025). Surrogate-Assisted Multi-objective Design of Complex Multibody Systems. In Lecture Notes in Computer Science. Springer Nature Switzerland. https://doi.org/10.1007/978-3-032-04555-3_21","ieee":"A. C. Amakor, M. B. Berkemeier, M. C. Wohlleben, W. Sextro, and S. Peitz, “Surrogate-Assisted Multi-objective Design of Complex Multibody Systems,” in Lecture Notes in Computer Science, Cham: Springer Nature Switzerland, 2025.","chicago":"Amakor, Augustina C., Manuel B. Berkemeier, Meike Claudia Wohlleben, Walter Sextro, and Sebastian Peitz. “Surrogate-Assisted Multi-Objective Design of Complex Multibody Systems.” In Lecture Notes in Computer Science. Cham: Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-032-04555-3_21.","ama":"Amakor AC, Berkemeier MB, Wohlleben MC, Sextro W, Peitz S. Surrogate-Assisted Multi-objective Design of Complex Multibody Systems. In: Lecture Notes in Computer Science. Springer Nature Switzerland; 2025. doi:10.1007/978-3-032-04555-3_21"},"quality_controlled":"1","publication_identifier":{"isbn":["9783032045546","9783032045553"],"issn":["0302-9743","1611-3349"]},"publication_status":"published","title":"Surrogate-Assisted Multi-objective Design of Complex Multibody Systems","doi":"10.1007/978-3-032-04555-3_21","publisher":"Springer Nature Switzerland","date_updated":"2026-03-03T06:32:10Z","date_created":"2025-12-09T12:46:17Z","author":[{"last_name":"Amakor","full_name":"Amakor, Augustina C.","first_name":"Augustina C."},{"last_name":"Berkemeier","full_name":"Berkemeier, Manuel B.","first_name":"Manuel B."},{"orcid":"0009-0009-9767-7168","last_name":"Wohlleben","id":"43991","full_name":"Wohlleben, Meike Claudia","first_name":"Meike Claudia"},{"full_name":"Sextro, Walter","id":"21220","last_name":"Sextro","first_name":"Walter"},{"first_name":"Sebastian","full_name":"Peitz, Sebastian","last_name":"Peitz"}],"status":"public","publication":"Lecture Notes in Computer Science","type":"book_chapter","language":[{"iso":"eng"}],"_id":"62988","department":[{"_id":"151"}],"user_id":"43991"},{"year":"2025","citation":{"chicago":"Dohmen, Markus Daniel, Peter Bornmann, Walter Littmann, Tobias Hemsel, and Walter Sextro. “Modellgestützte Optimierung Eines Ultraschall-Torsionsschweißsystems,” 2025.","ieee":"M. D. Dohmen, P. Bornmann, W. Littmann, T. Hemsel, and W. Sextro, “Modellgestützte Optimierung eines Ultraschall-Torsionsschweißsystems,” 2025.","ama":"Dohmen MD, Bornmann P, Littmann W, Hemsel T, Sextro W. Modellgestützte Optimierung eines Ultraschall-Torsionsschweißsystems. In: ; 2025.","apa":"Dohmen, M. D., Bornmann, P., Littmann, W., Hemsel, T., & Sextro, W. (2025). Modellgestützte Optimierung eines Ultraschall-Torsionsschweißsystems.","mla":"Dohmen, Markus Daniel, et al. Modellgestützte Optimierung Eines Ultraschall-Torsionsschweißsystems. 2025.","bibtex":"@inproceedings{Dohmen_Bornmann_Littmann_Hemsel_Sextro_2025, title={Modellgestützte Optimierung eines Ultraschall-Torsionsschweißsystems}, author={Dohmen, Markus Daniel and Bornmann, Peter and Littmann, Walter and Hemsel, Tobias and Sextro, Walter}, year={2025} }","short":"M.D. Dohmen, P. Bornmann, W. Littmann, T. Hemsel, W. Sextro, in: 2025."},"has_accepted_license":"1","title":"Modellgestützte Optimierung eines Ultraschall-Torsionsschweißsystems","date_updated":"2026-03-03T13:57:25Z","author":[{"id":"69217","full_name":"Dohmen, Markus Daniel","last_name":"Dohmen","first_name":"Markus Daniel"},{"full_name":"Bornmann, Peter","last_name":"Bornmann","first_name":"Peter"},{"first_name":"Walter","last_name":"Littmann","full_name":"Littmann, Walter"},{"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":"2026-03-02T12:02:08Z","abstract":[{"text":"Das Ultraschallschweißen ist in der Verpackungs-, Halbleiter- und Automobilindustrie weit verbreitet. Neben dem Schweißen von Blechen bietet es die Möglichkeit, Folien oder Hülsen zu verschweißen. Konventionelle Schweißsysteme arbeiten mit Längs- oder Biegeschwingungen, deren Hauptanteil in der Schweißebene liegt. Der orthogonale Anteil verursacht zusätzliche Belastungen im Schweißgut. Bei der Verwendung von Torsionsschwingungen wird die orthogonale Komponente der Schwingung nahezu eliminiert. \r\nIn diesem Beitrag wird ein System vorgestellt, bei dem die Torsionsschwingung durch tangentiale Polarisation der Piezokeramiken erzeugt wird. Der Transducer ist axial oberhalb des Schweißpunktes platziert, sodass die Normalkraft momentfrei aufgebracht wird. Das Schweißwerkzeug weicht beim Schweißvorgang daher seitlich nicht aus. Zudem wird das Schweißen an schwer zugänglichen Positionen vereinfacht, da der Systemaufbau deutlich schlanker ist als konventionelle Ultraschallschweißsysteme.\r\nDie Auslegung des Torsionsschwingsystems stellt eine Herausforderung dar. Insbesondere muss die Lagerung des Schwingers betrachtet werden, da diese die Normalkraft übertragen und zugleich die Schwingung nicht beeinträchtigen soll. Der Schweißprozess bewirkt eine Verschiebung von Schwingungsknoten und Resonanzfrequenzen. Im Rahmen des Vortrags wird ein Finite-Elemente-Simulationsmodell vorgestellt, das in Kombination mit einem Lastmodell das Systemverhalten während des Schweißprozesses abbildet. Die Geometrie des Transducers wurde schrittweise so angepasst, dass die Schwingamplitude im Lagerungspunkt minimiert wird. \r\n","lang":"ger"}],"file":[{"success":1,"relation":"main_file","content_type":"application/pdf","file_size":1912154,"file_name":"Dohmen_UPB_LDM_IMAPS_2025.pdf","access_level":"closed","file_id":"64805","date_updated":"2026-03-02T12:01:28Z","date_created":"2026-03-02T12:01:28Z","creator":"hemsel"}],"status":"public","type":"conference","ddc":["620"],"language":[{"iso":"eng"}],"file_date_updated":"2026-03-02T12:01:28Z","_id":"64804","user_id":"210","department":[{"_id":"151"}]},{"extern":"1","language":[{"iso":"eng"}],"article_type":"original","department":[{"_id":"151"},{"_id":"9"}],"user_id":"77313","_id":"58556","status":"public","abstract":[{"text":"To predict and prevent uneven tire wear in addition to a reduction of overall tire wear, it is essential to estimate not only the total amount of wear but also how the wear is distributed across the tire width. This requires knowledge of the frictional power distribution in the tire contact patch, which is the basis for calculating tire wear using a wear law. Usually, only 3D structural tire models can generate such distributed contact results. However, they involve high computational costs and cannot be used for comprehensive optimization of a vehicle’s suspension system with respect to tire wear characteristics. Hence, this contribution presents a methodology on how to accelerate the prediction of the frictional power distribution using two components: The structural tire model is replaced by an empirical tire model that on its own is not able to generate distributed contact results. Therefore, an artificial neural network is trained to predict the desired contact results from the kinematic quantities calculated by the empirical tire model. In the initial training phase, both components are fitted to data generated by the original complex tire model. After training, the empirical tire model can replace the structural tire model in vehicle simulations, resulting in significantly shorter calculation times. The simulation results are fed into the artificial neural network, which predicts the frictional power distributions over the tire width with negligible additional effort. Overall, the methodology reduces calculation time for the prediction of tire wear based on virtual test drives to approximately 25% of the time needed when using structural tire models.","lang":"eng"}],"publication":"Tire Science and Technology","type":"journal_article","doi":"https://doi.org/10.2346/TST-24-009","title":"Prediction of the Frictional Power Distribution in the Tire Contact Patch Based on an Empirical Tire Model and an Artificial Neural Network","date_created":"2025-02-10T19:54:28Z","author":[{"id":"77313","full_name":"Muth, Lars","last_name":"Muth","orcid":"0000-0002-2938-5616","first_name":"Lars"},{"last_name":"Zharia","full_name":"Zharia, Raphael","first_name":"Raphael"},{"first_name":"Hürkan","full_name":"Sahin, Hürkan","last_name":"Sahin"},{"full_name":"Sextro, Walter","id":"21220","last_name":"Sextro","first_name":"Walter"}],"publisher":"The Tire Society","date_updated":"2025-02-27T19:53:09Z","citation":{"ama":"Muth L, Zharia R, Sahin H, Sextro W. Prediction of the Frictional Power Distribution in the Tire Contact Patch Based on an Empirical Tire Model and an Artificial Neural Network. Tire Science and Technology. Published online 2025. doi:https://doi.org/10.2346/TST-24-009","chicago":"Muth, Lars, Raphael Zharia, Hürkan Sahin, and Walter Sextro. “Prediction of the Frictional Power Distribution in the Tire Contact Patch Based on an Empirical Tire Model and an Artificial Neural Network.” Tire Science and Technology, 2025. https://doi.org/10.2346/TST-24-009.","ieee":"L. Muth, R. Zharia, H. Sahin, and W. Sextro, “Prediction of the Frictional Power Distribution in the Tire Contact Patch Based on an Empirical Tire Model and an Artificial Neural Network,” Tire Science and Technology, 2025, doi: https://doi.org/10.2346/TST-24-009.","apa":"Muth, L., Zharia, R., Sahin, H., & Sextro, W. (2025). Prediction of the Frictional Power Distribution in the Tire Contact Patch Based on an Empirical Tire Model and an Artificial Neural Network. Tire Science and Technology. https://doi.org/10.2346/TST-24-009","mla":"Muth, Lars, et al. “Prediction of the Frictional Power Distribution in the Tire Contact Patch Based on an Empirical Tire Model and an Artificial Neural Network.” Tire Science and Technology, The Tire Society, 2025, doi:https://doi.org/10.2346/TST-24-009.","bibtex":"@article{Muth_Zharia_Sahin_Sextro_2025, title={Prediction of the Frictional Power Distribution in the Tire Contact Patch Based on an Empirical Tire Model and an Artificial Neural Network}, DOI={https://doi.org/10.2346/TST-24-009}, journal={Tire Science and Technology}, publisher={The Tire Society}, author={Muth, Lars and Zharia, Raphael and Sahin, Hürkan and Sextro, Walter}, year={2025} }","short":"L. Muth, R. Zharia, H. Sahin, W. Sextro, Tire Science and Technology (2025)."},"year":"2025","quality_controlled":"1","publication_status":"epub_ahead"},{"_id":"63193","project":[{"name":"Industrie 4.0 Ökosystem für den automatisierten Einsatz von datengetriebenen Services (I4.0AutoServ)","_id":"1483"}],"department":[{"_id":"151"}],"user_id":"47233","language":[{"iso":"eng"}],"publication":"2025 IEEE 30th International Conference on Emerging Technologies and Factory Automation (ETFA)","type":"conference","abstract":[{"lang":"eng","text":"The integration of data-driven models and specifically machine learning for conditon monitoring and predictive maintenance into companies, especially small and medium-sized enterprises, offers significant opportunities in reducing costs, operating more sustainably, and maintaining long-term competitiveness. However, many small and medium-sized enterprises lack the necessary resources and expertise to derive knowledge from data and integrate their own machine learning based solutions. To address this challenge, a framework is presented that enables the automated generation of data-driven models with a particular focus on condition monitoring and predictive maintenance, but applicable to other use cases as well. Using a dataset from the 2022 data challenge of the prognostics and health management society, it is demonstrated that the framework can generate high-performing models, achieving F1-scores up to 0.998, exemplarily for a classification task."}],"status":"public","publisher":"IEEE","date_updated":"2025-12-18T09:12:48Z","date_created":"2025-12-18T09:07:38Z","author":[{"last_name":"Löwen","id":"47233","full_name":"Löwen, Alexander","first_name":"Alexander"},{"first_name":"Dennis","last_name":"Quirin","full_name":"Quirin, Dennis"},{"first_name":"Marc","full_name":"Hesse, Marc","last_name":"Hesse"},{"full_name":"Aimiyekagbon, Osarenren Kennedy","id":"9557","last_name":"Aimiyekagbon","first_name":"Osarenren Kennedy"},{"last_name":"Sextro","id":"21220","full_name":"Sextro, Walter","first_name":"Walter"}],"title":"Facilitating the Automated Generation of Data-Driven Models for the Diagnostics and Prognostics of Technical Systems","doi":"10.1109/etfa65518.2025.11205799","conference":{"name":"2025 IEEE 30th International Conference on Emerging Technologies and Factory Automation (ETFA)","location":"Porto"},"publication_status":"published","related_material":{"link":[{"url":"https://ieeexplore.ieee.org/document/11205799","relation":"confirmation"}]},"year":"2025","citation":{"mla":"Löwen, Alexander, et al. “Facilitating the Automated Generation of Data-Driven Models for the Diagnostics and Prognostics of Technical Systems.” 2025 IEEE 30th International Conference on Emerging Technologies and Factory Automation (ETFA), IEEE, 2025, doi:10.1109/etfa65518.2025.11205799.","bibtex":"@inproceedings{Löwen_Quirin_Hesse_Aimiyekagbon_Sextro_2025, title={Facilitating the Automated Generation of Data-Driven Models for the Diagnostics and Prognostics of Technical Systems}, DOI={10.1109/etfa65518.2025.11205799}, booktitle={2025 IEEE 30th International Conference on Emerging Technologies and Factory Automation (ETFA)}, publisher={IEEE}, author={Löwen, Alexander and Quirin, Dennis and Hesse, Marc and Aimiyekagbon, Osarenren Kennedy and Sextro, Walter}, year={2025} }","short":"A. Löwen, D. Quirin, M. Hesse, O.K. Aimiyekagbon, W. Sextro, in: 2025 IEEE 30th International Conference on Emerging Technologies and Factory Automation (ETFA), IEEE, 2025.","apa":"Löwen, A., Quirin, D., Hesse, M., Aimiyekagbon, O. K., & Sextro, W. (2025). Facilitating the Automated Generation of Data-Driven Models for the Diagnostics and Prognostics of Technical Systems. 2025 IEEE 30th International Conference on Emerging Technologies and Factory Automation (ETFA). 2025 IEEE 30th International Conference on Emerging Technologies and Factory Automation (ETFA), Porto. https://doi.org/10.1109/etfa65518.2025.11205799","chicago":"Löwen, Alexander, Dennis Quirin, Marc Hesse, Osarenren Kennedy Aimiyekagbon, and Walter Sextro. “Facilitating the Automated Generation of Data-Driven Models for the Diagnostics and Prognostics of Technical Systems.” In 2025 IEEE 30th International Conference on Emerging Technologies and Factory Automation (ETFA). IEEE, 2025. https://doi.org/10.1109/etfa65518.2025.11205799.","ieee":"A. Löwen, D. Quirin, M. Hesse, O. K. Aimiyekagbon, and W. Sextro, “Facilitating the Automated Generation of Data-Driven Models for the Diagnostics and Prognostics of Technical Systems,” presented at the 2025 IEEE 30th International Conference on Emerging Technologies and Factory Automation (ETFA), Porto, 2025, doi: 10.1109/etfa65518.2025.11205799.","ama":"Löwen A, Quirin D, Hesse M, Aimiyekagbon OK, Sextro W. Facilitating the Automated Generation of Data-Driven Models for the Diagnostics and Prognostics of Technical Systems. In: 2025 IEEE 30th International Conference on Emerging Technologies and Factory Automation (ETFA). IEEE; 2025. doi:10.1109/etfa65518.2025.11205799"}},{"doi":"10.5162/ultrasonic2025/a18-a4","title":"Sensitivity Analysis and Material Parameter Estimation of a Pre-Stressed Langevin Transducer","author":[{"last_name":"Friesen","full_name":"Friesen, Olga","id":"44026","first_name":"Olga"},{"id":"38259","full_name":"Scheidemann, Claus","last_name":"Scheidemann","first_name":"Claus"},{"first_name":"Leander","full_name":"Claes, Leander","id":"11829","orcid":"0000-0002-4393-268X","last_name":"Claes"},{"last_name":"Hemsel","id":"210","full_name":"Hemsel, Tobias","first_name":"Tobias"},{"id":"213","full_name":"Henning, Bernd","last_name":"Henning","first_name":"Bernd"}],"date_created":"2025-11-25T12:23:06Z","date_updated":"2026-01-05T08:00:48Z","publisher":"AMA Service GmbH","page":"138–141","citation":{"short":"O. Friesen, C. Scheidemann, L. Claes, T. Hemsel, B. Henning, in: 2025 International Congress on Ultrasonics, AMA Service GmbH, Paderborn, 2025, pp. 138–141.","bibtex":"@inproceedings{Friesen_Scheidemann_Claes_Hemsel_Henning_2025, place={Paderborn}, title={Sensitivity Analysis and Material Parameter Estimation of a Pre-Stressed Langevin Transducer}, DOI={10.5162/ultrasonic2025/a18-a4}, booktitle={2025 International Congress on Ultrasonics}, publisher={AMA Service GmbH}, author={Friesen, Olga and Scheidemann, Claus and Claes, Leander and Hemsel, Tobias and Henning, Bernd}, year={2025}, pages={138–141} }","mla":"Friesen, Olga, et al. “Sensitivity Analysis and Material Parameter Estimation of a Pre-Stressed Langevin Transducer.” 2025 International Congress on Ultrasonics, AMA Service GmbH, 2025, pp. 138–141, doi:10.5162/ultrasonic2025/a18-a4.","apa":"Friesen, O., Scheidemann, C., Claes, L., Hemsel, T., & Henning, B. (2025). Sensitivity Analysis and Material Parameter Estimation of a Pre-Stressed Langevin Transducer. 2025 International Congress on Ultrasonics, 138–141. https://doi.org/10.5162/ultrasonic2025/a18-a4","chicago":"Friesen, Olga, Claus Scheidemann, Leander Claes, Tobias Hemsel, and Bernd Henning. “Sensitivity Analysis and Material Parameter Estimation of a Pre-Stressed Langevin Transducer.” In 2025 International Congress on Ultrasonics, 138–141. Paderborn: AMA Service GmbH, 2025. https://doi.org/10.5162/ultrasonic2025/a18-a4.","ieee":"O. Friesen, C. Scheidemann, L. Claes, T. Hemsel, and B. Henning, “Sensitivity Analysis and Material Parameter Estimation of a Pre-Stressed Langevin Transducer,” in 2025 International Congress on Ultrasonics, 2025, pp. 138–141, doi: 10.5162/ultrasonic2025/a18-a4.","ama":"Friesen O, Scheidemann C, Claes L, Hemsel T, Henning B. Sensitivity Analysis and Material Parameter Estimation of a Pre-Stressed Langevin Transducer. In: 2025 International Congress on Ultrasonics. AMA Service GmbH; 2025:138–141. doi:10.5162/ultrasonic2025/a18-a4"},"year":"2025","place":"Paderborn","language":[{"iso":"eng"}],"department":[{"_id":"49"},{"_id":"151"}],"user_id":"11829","_id":"62299","project":[{"_id":"245","name":"FOR 5208: Modellbasierte Bestimmung nichtlinearer Eigenschaften von Piezokeramiken für Leistungsschallanwendungen (NEPTUN)"}],"status":"public","publication":"2025 International Congress on Ultrasonics","type":"conference"},{"keyword":["bushing","experimental data","rubber-metal-bushing","Dataset suspension"],"user_id":"22109","department":[{"_id":"151"}],"_id":"64894","status":"public","abstract":[{"lang":"eng","text":"This dataset contains experimental measurements of the radial dynamic and quasi-static characteristics of four different types of Rubber-Metal Bushings (RMBs) used in the suspension system of a passenger car under harmonic displacement excitation. For each bushing type, 2–3 individual specimens were tested.\r\n \r\nQuasi-static measurements were performed at a constant excitation frequency of 0.05 Hz with varying displacement amplitudes. Dynamic measurements were conducted with displacement amplitudes ranging from 0.04 mm to 0.3 mm and excitation frequencies of 2, 5, 10, ..., up to 100 Hz.\r\n\r\nThe data is structured by bushing type, measurement mode, amplitude, and frequency, and is provided in *.csv and *.hrm format. It is intended to support further research in modeling rubber-metal bushings and parameter identification techniques."}],"type":"research_data","doi":"10.5281/ZENODO.14851317","title":"Experimental Dataset: Force and Displacement Measurements of Four Rubber-Metal Bushing Types from a Passenger Car under Harmonic Displacement Excitation","date_created":"2026-03-11T10:22:01Z","author":[{"first_name":"Jan","orcid":"0000-0001-9025-9742","last_name":"Schütte","full_name":"Schütte, Jan","id":"22109"}],"date_updated":"2026-03-11T10:25:23Z","publisher":"LibreCat University","citation":{"ieee":"J. Schütte, Experimental Dataset: Force and Displacement Measurements of Four Rubber-Metal Bushing Types from a Passenger Car under Harmonic Displacement Excitation. LibreCat University, 2025.","chicago":"Schütte, Jan. Experimental Dataset: Force and Displacement Measurements of Four Rubber-Metal Bushing Types from a Passenger Car under Harmonic Displacement Excitation. LibreCat University, 2025. https://doi.org/10.5281/ZENODO.14851317.","ama":"Schütte J. Experimental Dataset: Force and Displacement Measurements of Four Rubber-Metal Bushing Types from a Passenger Car under Harmonic Displacement Excitation. LibreCat University; 2025. doi:10.5281/ZENODO.14851317","short":"J. Schütte, Experimental Dataset: Force and Displacement Measurements of Four Rubber-Metal Bushing Types from a Passenger Car under Harmonic Displacement Excitation, LibreCat University, 2025.","mla":"Schütte, Jan. Experimental Dataset: Force and Displacement Measurements of Four Rubber-Metal Bushing Types from a Passenger Car under Harmonic Displacement Excitation. LibreCat University, 2025, doi:10.5281/ZENODO.14851317.","bibtex":"@book{Schütte_2025, title={Experimental Dataset: Force and Displacement Measurements of Four Rubber-Metal Bushing Types from a Passenger Car under Harmonic Displacement Excitation}, DOI={10.5281/ZENODO.14851317}, publisher={LibreCat University}, author={Schütte, Jan}, year={2025} }","apa":"Schütte, J. (2025). Experimental Dataset: Force and Displacement Measurements of Four Rubber-Metal Bushing Types from a Passenger Car under Harmonic Displacement Excitation. LibreCat University. https://doi.org/10.5281/ZENODO.14851317"},"year":"2025"},{"status":"public","file":[{"file_size":1878995,"access_level":"closed","file_name":"ICU_2025_Bornmann.pdf","file_id":"65354","date_updated":"2026-04-02T12:46:09Z","creator":"hemsel","date_created":"2026-04-02T12:46:09Z","success":1,"relation":"main_file","content_type":"application/pdf"}],"abstract":[{"lang":"eng","text":"Nowadays ultrasound technology is established in various fields of application like industrial production or medical technology. Besides high power ultrasound applications like ultrasonic cleaning and ultrasonic welding, which are often not strongly restricted regarding their weight, costs, and construction space, there are many applications in the low to medium power range like handheld surgical instruments, medical inhalers, or ultrasonic cutters. For the latter there is often a strong demand for low weight and construction space and low costs to be competitive in mass production. Another challenge that arises from the RoHS-directive [1] is, that new ultrasonic devices should avoid the use of lead-containing PZT-materials. Against this background there is a demand for lead-free, small and lightweight and cost-effective ultrasonic transducers.\r\nIn many of the above-mentioned applications, pre-stressed Bolted-Langevine-Transducers (BLT) based on lead-containing PZT-materials are established to generate ultrasonic vibrations. These are quite advantageous in many ways and can be built tailored to each application and even for high power of thousands of watts. But due to the required steps during their manufacturing process (machining parts, assembly, pre-stressing, frequency tuning, …), these transducers remain expensive. Furthermore, due to the operation in resonance, the construction space of these transducers is linked to their wavelength and cannot be reduced remarkably.\r\nFor these reasons, our aim is to present an innovative lead-free ultrasonic transducer for low to medium power applications, that is based on bending vibrations instead of longitudinal vibrations. This design enables to build very small transducers. Furthermore, due to their simple construction, these transducers can be built at low manufacturing costs and are well suited for industrial mass production. The use of lead-free piezoelectric materials makes this transducer design ready for future applications.\r\nIn our contribution we will present the model-based design of a lead-free 30 kHz bending transducer for applications up to 10 W. Furthermore, the comprehensive experimental analysis of this transducer-prototype in applications like mist generation or ultrasonic drilling will be presented. The results will be compared to a PZT-based bending transducer and a classical BLT to show the potential and limits of these kind of transducers and lead-free materials.\r\n"}],"type":"conference","file_date_updated":"2026-04-02T12:46:09Z","language":[{"iso":"eng"}],"ddc":["620"],"department":[{"_id":"151"}],"user_id":"210","_id":"64803","citation":{"ama":"Bornmann P, Littmann W, Scheidemann C, Hemsel T. Innovative lead-free ultrasonic bending transducers for low to medium power applications. In: ; 2025.","ieee":"P. Bornmann, W. Littmann, C. Scheidemann, and T. Hemsel, “Innovative lead-free ultrasonic bending transducers for low to medium power applications,” presented at the International Congress on Ultrasonics (ICU), Paderborn, Germany, 2025.","chicago":"Bornmann, Peter, Walter Littmann, Claus Scheidemann, and Tobias Hemsel. “Innovative Lead-Free Ultrasonic Bending Transducers for Low to Medium Power Applications,” 2025.","mla":"Bornmann, Peter, et al. Innovative Lead-Free Ultrasonic Bending Transducers for Low to Medium Power Applications. 2025.","short":"P. Bornmann, W. Littmann, C. Scheidemann, T. Hemsel, in: 2025.","bibtex":"@inproceedings{Bornmann_Littmann_Scheidemann_Hemsel_2025, title={Innovative lead-free ultrasonic bending transducers for low to medium power applications}, author={Bornmann, Peter and Littmann, Walter and Scheidemann, Claus and Hemsel, Tobias}, year={2025} }","apa":"Bornmann, P., Littmann, W., Scheidemann, C., & Hemsel, T. (2025). Innovative lead-free ultrasonic bending transducers for low to medium power applications. International Congress on Ultrasonics (ICU), Paderborn, Germany."},"year":"2025","has_accepted_license":"1","conference":{"end_date":"2025-09-25","location":"Paderborn, Germany","name":"International Congress on Ultrasonics (ICU)","start_date":"2025-09-21"},"title":"Innovative lead-free ultrasonic bending transducers for low to medium power applications","date_created":"2026-03-02T11:35:33Z","author":[{"last_name":"Bornmann","full_name":"Bornmann, Peter","first_name":"Peter"},{"last_name":"Littmann","full_name":"Littmann, Walter","first_name":"Walter"},{"last_name":"Scheidemann","id":"38259","full_name":"Scheidemann, Claus","first_name":"Claus"},{"id":"210","full_name":"Hemsel, Tobias","last_name":"Hemsel","first_name":"Tobias"}],"date_updated":"2026-04-02T12:47:18Z"},{"abstract":[{"text":"Power ultrasonic actuators are used in various industrial, automotive and medical applications. Examples are ultrasonic welding of plastics or metal, surgery processes like cutting of tissue or bone, and the excitation of cavitation in liquids for ultrasonic cleaning. From a physical point of view, many of these processes are characterised by non-constant damping conditions for the ultrasonic actuators, since the systems need to be driven in unloaded as well as in high-loaded states. To get high power output, the piezoelectric actuators are usually driven in or near resonance at precisely defined vibration amplitudes. This is a quite complicated task especially if cost or mass optimized PZT transducers are used or if lead-free piezoelectric ceramics are applied to replace lead-containing materials. In particular the sudden change between loading states is very challenging for electronic excitation and control. The present contribution gives insight into typical problems that may arise in context with sudden load-changes during operation, e.g. uncontrolled jumps in voltage and velocity amplitudes. Measurements on ultrasonic power actuators being abruptly immersed into water at high amplitude are discussed for illustration. Observations during spontaneous load-changes are explained, and it is shown that several problems may be defused by driving the actuators in antiresonance or using a particular driving point in-between resonance and antiresonance (“falling edge control”). The different control strategies are investigated always using just one single hardware.","lang":"eng"}],"file":[{"file_size":2522135,"access_level":"closed","file_id":"65353","file_name":"ICU_2025_Littmann.pdf","date_updated":"2026-04-02T12:41:08Z","creator":"hemsel","date_created":"2026-04-02T12:41:08Z","success":1,"relation":"main_file","content_type":"application/pdf"}],"status":"public","type":"conference","ddc":["620"],"language":[{"iso":"eng"}],"file_date_updated":"2026-04-02T12:41:08Z","_id":"64802","user_id":"210","department":[{"_id":"151"}],"year":"2025","citation":{"bibtex":"@inproceedings{Littmann_Bornmann_Hemsel_Scheidemann_2025, title={Power ultrasonic actuators with suddenly changing loads: How to control the amplitudes in resonance, antiresonance, or in-between}, author={Littmann, Walter and Bornmann, Peter and Hemsel, Tobias and Scheidemann, Claus}, year={2025} }","mla":"Littmann, Walter, et al. Power Ultrasonic Actuators with Suddenly Changing Loads: How to Control the Amplitudes in Resonance, Antiresonance, or in-Between. 2025.","short":"W. Littmann, P. Bornmann, T. Hemsel, C. Scheidemann, in: 2025.","apa":"Littmann, W., Bornmann, P., Hemsel, T., & Scheidemann, C. (2025). Power ultrasonic actuators with suddenly changing loads: How to control the amplitudes in resonance, antiresonance, or in-between. International Conference on Ultrasonics (ICU), Paderborn, Germany.","ama":"Littmann W, Bornmann P, Hemsel T, Scheidemann C. Power ultrasonic actuators with suddenly changing loads: How to control the amplitudes in resonance, antiresonance, or in-between. In: ; 2025.","ieee":"W. Littmann, P. Bornmann, T. Hemsel, and C. Scheidemann, “Power ultrasonic actuators with suddenly changing loads: How to control the amplitudes in resonance, antiresonance, or in-between,” presented at the International Conference on Ultrasonics (ICU), Paderborn, Germany, 2025.","chicago":"Littmann, Walter, Peter Bornmann, Tobias Hemsel, and Claus Scheidemann. “Power Ultrasonic Actuators with Suddenly Changing Loads: How to Control the Amplitudes in Resonance, Antiresonance, or in-Between,” 2025."},"has_accepted_license":"1","title":"Power ultrasonic actuators with suddenly changing loads: How to control the amplitudes in resonance, antiresonance, or in-between","conference":{"name":"International Conference on Ultrasonics (ICU)","start_date":"2025-09-21","end_date":"2025-09-25","location":"Paderborn, Germany"},"date_updated":"2026-04-02T12:45:42Z","date_created":"2026-03-02T11:19:46Z","author":[{"first_name":"Walter","full_name":"Littmann, Walter","last_name":"Littmann"},{"first_name":"Peter","full_name":"Bornmann, Peter","last_name":"Bornmann"},{"last_name":"Hemsel","id":"210","full_name":"Hemsel, Tobias","first_name":"Tobias"},{"first_name":"Claus","full_name":"Scheidemann, Claus","id":"38259","last_name":"Scheidemann"}]},{"publication_status":"published","publication_identifier":{"issn":["2079-9292"]},"citation":{"ama":"Aimiyekagbon OK, Bender A, Hemsel T, Sextro W. Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions. Electronics. 2024;13(3). doi:10.3390/electronics13030521","ieee":"O. K. Aimiyekagbon, A. Bender, T. Hemsel, and W. Sextro, “Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions,” Electronics, vol. 13, no. 3, Art. no. 521, 2024, doi: 10.3390/electronics13030521.","chicago":"Aimiyekagbon, Osarenren Kennedy, Amelie Bender, Tobias Hemsel, and Walter Sextro. “Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions.” Electronics 13, no. 3 (2024). https://doi.org/10.3390/electronics13030521.","apa":"Aimiyekagbon, O. K., Bender, A., Hemsel, T., & Sextro, W. (2024). Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions. Electronics, 13(3), Article 521. https://doi.org/10.3390/electronics13030521","short":"O.K. Aimiyekagbon, A. Bender, T. Hemsel, W. Sextro, Electronics 13 (2024).","bibtex":"@article{Aimiyekagbon_Bender_Hemsel_Sextro_2024, title={Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions}, volume={13}, DOI={10.3390/electronics13030521}, number={3521}, journal={Electronics}, publisher={MDPI AG}, author={Aimiyekagbon, Osarenren Kennedy and Bender, Amelie and Hemsel, Tobias and Sextro, Walter}, year={2024} }","mla":"Aimiyekagbon, Osarenren Kennedy, et al. “Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions.” Electronics, vol. 13, no. 3, 521, MDPI AG, 2024, doi:10.3390/electronics13030521."},"intvolume":" 13","author":[{"last_name":"Aimiyekagbon","id":"9557","full_name":"Aimiyekagbon, Osarenren Kennedy","first_name":"Osarenren Kennedy"},{"first_name":"Amelie","last_name":"Bender","id":"54290","full_name":"Bender, Amelie"},{"first_name":"Tobias","last_name":"Hemsel","id":"210","full_name":"Hemsel, Tobias"},{"first_name":"Walter","last_name":"Sextro","id":"21220","full_name":"Sextro, Walter"}],"volume":13,"date_updated":"2024-03-15T16:15:56Z","doi":"10.3390/electronics13030521","type":"journal_article","status":"public","user_id":"9557","department":[{"_id":"151"}],"_id":"51518","funded_apc":"1","article_number":"521","article_type":"original","issue":"3","quality_controlled":"1","year":"2024","date_created":"2024-02-20T06:46:43Z","publisher":"MDPI AG","title":"Diagnostics of Piezoelectric Bending Actuators Subjected to Varying Operating Conditions","publication":"Electronics","abstract":[{"lang":"eng","text":"In applications of piezoelectric actuators and sensors, the dependability and particularly the reliability throughout their lifetime are vital to manufacturers and end-users and are enabled through condition-monitoring approaches. Existing approaches often utilize impedance measurements over a range of frequencies or velocity measurements and require additional equipment or sensors, such as a laser Doppler vibrometer. Furthermore, the non-negligible effects of varying operating conditions are often unconsidered. To minimize the need for additional sensors while maintaining the dependability of piezoelectric bending actuators irrespective of varying operating conditions, an online diagnostics approach is proposed. To this end, time- and frequency-domain features are extracted from monitored current signals to reflect hairline crack development in bending actuators. For validation of applicability, the presented analysis method was evaluated on piezoelectric bending actuators subjected to accelerated lifetime tests at varying voltage amplitudes and under external damping conditions. In the presence of a crack and due to a diminished stiffness, the resonance frequency decreases and the root-mean-square amplitude of the current signal simultaneously abruptly drops during the lifetime tests. Furthermore, the piezoelectric crack surfaces clapping is reflected in higher harmonics of the current signal. Thus, time-domain features and harmonics of the current signals are sufficient to diagnose hairline cracks in the actuators."}],"language":[{"iso":"eng"}],"keyword":["piezoelectric transducer","self-sensing","fault detection","diagnostics","hairline crack","condition monitoring"]},{"date_updated":"2024-03-18T11:32:27Z","volume":16,"author":[{"last_name":"Dymel","full_name":"Dymel, Collin","first_name":"Collin"}],"publication_identifier":{"isbn":["9783844093964"]},"publication_status":"published","related_material":{"link":[{"relation":"confirmation","url":"https://www.shaker.de/de/content/catalogue/index.asp?lang=de&ID=8&ISBN=978-3-8440-9396-4&search=yes"}]},"place":"Düren","intvolume":" 16","page":"134","citation":{"short":"C. Dymel, Modellbasierte Entwicklung von Ultraschallwandlern unter der Berücksichtigung von Nichtlinearitäten, Shaker Verlag, Düren, 2024.","bibtex":"@book{Dymel_2024, place={Düren}, series={Schriften des Lehrstuhls für Dynamik und Mechatronik}, title={Modellbasierte Entwicklung von Ultraschallwandlern unter der Berücksichtigung von Nichtlinearitäten}, volume={16}, publisher={Shaker Verlag}, author={Dymel, Collin}, year={2024}, collection={Schriften des Lehrstuhls für Dynamik und Mechatronik} }","mla":"Dymel, Collin. Modellbasierte Entwicklung von Ultraschallwandlern unter der Berücksichtigung von Nichtlinearitäten. Shaker Verlag, 2024.","apa":"Dymel, C. (2024). Modellbasierte Entwicklung von Ultraschallwandlern unter der Berücksichtigung von Nichtlinearitäten (Vol. 16). Shaker Verlag.","ieee":"C. Dymel, Modellbasierte Entwicklung von Ultraschallwandlern unter der Berücksichtigung von Nichtlinearitäten, vol. 16. Düren: Shaker Verlag, 2024.","chicago":"Dymel, Collin. Modellbasierte Entwicklung von Ultraschallwandlern unter der Berücksichtigung von Nichtlinearitäten. Vol. 16. Schriften des Lehrstuhls für Dynamik und Mechatronik. Düren: Shaker Verlag, 2024.","ama":"Dymel C. Modellbasierte Entwicklung von Ultraschallwandlern unter der Berücksichtigung von Nichtlinearitäten. Vol 16. Shaker Verlag; 2024."},"jel":["D3"],"_id":"52611","department":[{"_id":"151"}],"user_id":"55222","series_title":"Schriften des Lehrstuhls für Dynamik und Mechatronik","type":"dissertation","status":"public","publisher":"Shaker Verlag","date_created":"2024-03-18T11:13:27Z","title":"Modellbasierte Entwicklung von Ultraschallwandlern unter der Berücksichtigung von Nichtlinearitäten","year":"2024","keyword":["Nichtlineares piezoelektrisches Verhalten","Dehnungsabhängigkeit","Vorspannungseinfluss","Temperatureinfluss","Lasteinfluss","Langevin-Schwinger","Ultraschallwandler","Ultraschallbonden","FEM-Modell","Ultraschallschweißen","BVD-Modell"],"language":[{"iso":"ger"}],"abstract":[{"text":"Ultraschallsysteme für das Herstellen für Bond- und Schweißverbindungen in der Halbleiterfertigung zeigen auf Grund des Betriebes unter hohen Anregungsniveaus nichtlineare Materialeigenschaften. Dabei wirken unterschiedliche Einflussfaktoren auf die elektrischen Eigenschaften und die mechanischen Übertragungscharakteristiken der Ultraschallsysteme ein. Die Herausforderungen ein solches geprägtes System auszulegen oder effizient und zuverlässig zu betreiben, sind aufgrund der Nichtlinearitäten relativ groß.\r\nDa für die Beschreibung der nichtlinearen Materialbeziehungen nur wenige Modelle und kaum quantitative Angaben vorliegen, werden die komplexen Wechselwirkungen von Materialparametern, Geometrie und Vorspannung des Schwingers, Betriebsgrößen (Strom, Spannung), Temperatur und Prozesslasten durch systematische Untersuchungen von Keramiken und Langevin-Schwingern messtechnisch erfasst. Aus den Messergebnissen werden einerseits eindimensionale Modelle für Voruntersuchungen als auch vollständige Materialparametersätze für die Simulation mittels dreidimensionaler FE-Modelle hergeleitet.\r\nEine Methodik zur Ermittlung der Materialparameter und ein auf iterativen Simulationen von FE-Modellen basierendes Werkzeug zur Simulation der komplexen Wechselwirkungen werden vorgestellt. Anhand eines exemplarischen Ultraschallsystems wird gezeigt, dass die Wirkungen temperaturbedingter Vorspannungsverluste, Änderungen des elektrischen Klemmenverhaltens und Amplituden- und Frequenzänderungen während des Betriebes bei großen Amplituden und Prozesslasten durch die Variationen des Keramikvolumens und der Keramikposition positiv beeinflusst werden können.","lang":"ger"}]},{"title":"Diagnostics and Prognostics for Retrofitted Systems: A Comprehensive Approach for Enhanced System Health Assessment","conference":{"start_date":"2024-05-28","name":"2024 Prognostics and System Health Management Conference (PHM)","location":"Stockholm, Schweden","end_date":"2024-05-31"},"doi":"10.1109/PHM61473.2024.00038","date_updated":"2024-07-22T09:29:26Z","publisher":"IEEE Computer Society","date_created":"2024-07-22T09:27:57Z","author":[{"first_name":"Amelie","id":"54290","full_name":"Bender, Amelie","last_name":"Bender"},{"first_name":"Osarenren Kennedy","last_name":"Aimiyekagbon","full_name":"Aimiyekagbon, Osarenren Kennedy","id":"9557"},{"full_name":"Sextro, Walter","id":"21220","last_name":"Sextro","first_name":"Walter"}],"year":"2024","citation":{"bibtex":"@inproceedings{Bender_Aimiyekagbon_Sextro_2024, title={Diagnostics and Prognostics for Retrofitted Systems: A Comprehensive Approach for Enhanced System Health Assessment}, DOI={10.1109/PHM61473.2024.00038}, booktitle={Proceedings of the 2024 Prognostics and System Health Management Conference (PHM)}, publisher={IEEE Computer Society}, author={Bender, Amelie and Aimiyekagbon, Osarenren Kennedy and Sextro, Walter}, year={2024} }","mla":"Bender, Amelie, et al. “Diagnostics and Prognostics for Retrofitted Systems: A Comprehensive Approach for Enhanced System Health Assessment.” Proceedings of the 2024 Prognostics and System Health Management Conference (PHM), IEEE Computer Society, 2024, doi:10.1109/PHM61473.2024.00038.","short":"A. Bender, O.K. Aimiyekagbon, W. Sextro, in: Proceedings of the 2024 Prognostics and System Health Management Conference (PHM), IEEE Computer Society, 2024.","apa":"Bender, A., Aimiyekagbon, O. K., & Sextro, W. (2024). Diagnostics and Prognostics for Retrofitted Systems: A Comprehensive Approach for Enhanced System Health Assessment. Proceedings of the 2024 Prognostics and System Health Management Conference (PHM). 2024 Prognostics and System Health Management Conference (PHM), Stockholm, Schweden. https://doi.org/10.1109/PHM61473.2024.00038","chicago":"Bender, Amelie, Osarenren Kennedy Aimiyekagbon, and Walter Sextro. “Diagnostics and Prognostics for Retrofitted Systems: A Comprehensive Approach for Enhanced System Health Assessment.” In Proceedings of the 2024 Prognostics and System Health Management Conference (PHM). IEEE Computer Society, 2024. https://doi.org/10.1109/PHM61473.2024.00038.","ieee":"A. Bender, O. K. Aimiyekagbon, and W. Sextro, “Diagnostics and Prognostics for Retrofitted Systems: A Comprehensive Approach for Enhanced System Health Assessment,” presented at the 2024 Prognostics and System Health Management Conference (PHM), Stockholm, Schweden, 2024, doi: 10.1109/PHM61473.2024.00038.","ama":"Bender A, Aimiyekagbon OK, Sextro W. Diagnostics and Prognostics for Retrofitted Systems: A Comprehensive Approach for Enhanced System Health Assessment. In: Proceedings of the 2024 Prognostics and System Health Management Conference (PHM). IEEE Computer Society; 2024. doi:10.1109/PHM61473.2024.00038"},"quality_controlled":"1","publication_identifier":{"isbn":["979-8-3503-6058-5"]},"keyword":["retrofit","diagnosis","prognostics","RUL prediction","missing data","ball bearings"],"language":[{"iso":"eng"}],"_id":"55336","user_id":"54290","department":[{"_id":"151"}],"abstract":[{"lang":"eng","text":"Predicting the remaining useful life of technical \r\nsystems has gained significant attention in recent years due to \r\nincreasing demands for extending the lifespan of degrading system \r\ncomponents. Therefore, already used systems are retrofitted by \r\nintegrating sensors to monitor their performance and \r\nfunctionality, enabling accurate diagnosis of their condition and \r\nprediction of their remaining useful life. One of the main \r\nchallenges in this field is identified in the missing data from the \r\ntime where the retrofitted system has already run but without \r\nbeing monitored by sensors. In this paper, a novel approach for \r\nthe combined diagnostics and prognostics of retrofitted systems is \r\nproposed. The methodology aims to provide an accurate diagnosis \r\nof the system’s health state and estimation of the remaining useful \r\nlife by a combination of a machine learning and expert knowledge. \r\nTo evaluate the effectiveness of the proposed methodology, a case \r\nstudy involving a retrofitted system in an industrial setting is \r\nselected and applied. It is demonstrated that the approach \r\neffectively diagnose the current system’s health state and \r\naccurately predict its remaining useful life, thereby enabling \r\npredictive maintenance and decision-making. Overall, our \r\nresearch contributes to advancing the field of condition \r\nmonitoring for retrofitted systems by providing a comprehensive \r\nmethodology that addresses the challenge of missing data."}],"status":"public","type":"conference","publication":"Proceedings of the 2024 Prognostics and System Health Management Conference (PHM)"},{"type":"conference","status":"public","file":[{"file_size":1984385,"file_name":"IWPMA_2024_Scheidemann.pdf","access_level":"open_access","file_id":"63820","date_updated":"2026-03-02T11:00:13Z","date_created":"2026-01-30T14:50:06Z","creator":"hemsel","relation":"main_file","content_type":"application/pdf"}],"department":[{"_id":"151"}],"user_id":"210","_id":"61756","language":[{"iso":"eng"}],"file_date_updated":"2026-03-02T11:00:13Z","ddc":["620"],"has_accepted_license":"1","citation":{"ama":"Scheidemann C, Hemsel T, Sextro W. Characteristic behavior of lead-free and lead-containing piezo ring ceramics in ultrasonic transducers. In: ; 2024.","chicago":"Scheidemann, Claus, Tobias Hemsel, and Walter Sextro. “Characteristic Behavior of Lead-Free and Lead-Containing Piezo Ring Ceramics in Ultrasonic Transducers,” 2024.","ieee":"C. Scheidemann, T. Hemsel, and W. Sextro, “Characteristic behavior of lead-free and lead-containing piezo ring ceramics in ultrasonic transducers,” presented at the 21nd International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA), Hannover, Germany, 2024.","apa":"Scheidemann, C., Hemsel, T., & Sextro, W. (2024). Characteristic behavior of lead-free and lead-containing piezo ring ceramics in ultrasonic transducers. 21nd International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA), Hannover, Germany.","bibtex":"@inproceedings{Scheidemann_Hemsel_Sextro_2024, title={Characteristic behavior of lead-free and lead-containing piezo ring ceramics in ultrasonic transducers}, author={Scheidemann, Claus and Hemsel, Tobias and Sextro, Walter}, year={2024} }","short":"C. Scheidemann, T. Hemsel, W. Sextro, in: 2024.","mla":"Scheidemann, Claus, et al. Characteristic Behavior of Lead-Free and Lead-Containing Piezo Ring Ceramics in Ultrasonic Transducers. 2024."},"year":"2024","date_created":"2025-10-08T14:28:33Z","author":[{"first_name":"Claus","last_name":"Scheidemann","id":"38259","full_name":"Scheidemann, Claus"},{"last_name":"Hemsel","id":"210","full_name":"Hemsel, Tobias","first_name":"Tobias"},{"first_name":"Walter","last_name":"Sextro","full_name":"Sextro, Walter","id":"21220"}],"date_updated":"2026-03-02T11:00:14Z","oa":"1","conference":{"start_date":"2024-07-22","name":"21nd International Workshop on Piezoelectric Materials and Applications in Actuators (IWPMA)","location":"Hannover, Germany","end_date":"2024-07-26"},"title":"Characteristic behavior of lead-free and lead-containing piezo ring ceramics in ultrasonic transducers"}]