Publications of the Research group Piezoelectric and Ultrasonic Technology

Lian, Y., Long, Y., Zhao, G., Mu, C., Li, X., Deng, J., Xie, C. (2020): Performance of CrCN-WS2 hard/soft composite coated tools in dry cutting of titanium alloys,  Journal of Manufacturing Processes, 54, pp.201-209
DOI: https://doi.org/10.1016/j.jmapro.2020.03.014

Long, Y., He, B., Cui, W., Ji, Y., Zhuang, X., Twiefel, J. (2020): Investigations on the mechanism of microweld changes during ultrasonic wire bonding by molecular dynamics simulation,  Materials & Design, 192, 108718
DOI: https://doi.org/10.1016/j.matdes.2020.108718

Schmelt, A. S.; Twiefel, J. (2020): Flaw Detection on a Tilted Particleboard by Use of the Spec-Radiation Method,  MDPI Appl. Sci. More info
DOI: https://doi.org/10.3390/app10238513

Schmelt, A.S.; Marhenke, T.; Hasener, J.; Twiefel, J. (2020): Investigation and Enhancement of the Detectability of Flaws with a Coarse Measuring Grid and Air Coupled Ultrasound for NDT of Panel Materials Using the Re-Radiation Method,  MDPI-applied science | File |
DOI: 10.3390/app10031155

Schmelt, A.S.; Twiefel, J. (2020): The Spec-Radiation Method as a Fast Alternative to the Re-Radiation Method for the Detection of Flaws in Wooden Particleboards,  MDPI Appl. Sci. 2020, 10, 6663 | File |
DOI: https://doi.org/10.3390/app10196663

You, C., Zhao, G., Chu, X., Zhou, W., Long, Y., Lian Y. (2020): Design, preparation and cutting performance of bionic cutting tools based on head microstructures of dung beetle,  Journal of Manufacturing Processes, 58, pp.129-135
DOI: https://doi.org/10.1016/j.jmapro.2020.07.057

Zhang, T., Long, Y., Mu, C., Zhou, W., Zhao, G., Lian Y. (2020): Performance of soft/hard composite dual-effect coated tool in dry cutting of carbon fiber–reinforced polymer,  The International Journal of Advanced Manufacturing Technology, 109, pp.2221-2232
DOI: https://doi.org/10.1007/s00170-020-05778-w

Bai, F., Long, Y., Saalbach, K.A., Twiefel, J. (2019): Theoretical and experimental investigations of ultrasonic sound fields in thin bubbly liquid layers for ultrasonic cavitation peening,  Ultrasonics, 93, pp.130-138
DOI: https://doi.org/10.1016/j.ultras.2018.11.010

Denkena, B.; Breidenstein, B.; Grove, T.; Prasanthan, V.; Overmeyer, L.; Nothdurft, S.; Kaierle, S.; Wallaschek, J.; Twiefel, J.; Ohrdes, H.; Maier, H. J.; Hassel, T.; Mildebrath, M.: (2019): Surface integrity of turned laser-welded hybrid shafts,  Production Engineering
DOI: 10.1007/s11740-018-0862-8

Li, Y., Cheng, Z., Chen, X., Long, Y., Li, X., Li, F., Li, J., Twiefel, J. (2019): Constitutive modeling and deformation analysis for the ultrasonic-assisted incremental forming process,  The International Journal of Advanced Manufacturing Technology 104, pp.2287–2299
DOI: https://doi.org/10.1007/s00170-019-04031-3

Long, Y., Bai, F., Zhang, Y., Saalbach, K.A., Twiefel, J. (2019): Impacts of ultrasound on oxide removal–An attempt towards acid-free cleaning,  Ultrasonics sonochemistry, 57, pp.1-11
DOI: https://doi.org/10.1016/j.ultsonch.2019.05.003

Long, Y., Schneider, F., Li, C., Hermsdorf, J., Twiefel, J., Wallaschek, J. (2019): Quantification of the energy flows during ultrasonic wire bonding under different process parameters,  International Journal of Precision Engineering and Manufacturing-Green Technology, 6(3), pp.449-463
DOI: https://doi.org/10.1007/s40684-019-00061-0

Long, Y., Twiefel, J., Wallaschek, J. (2019): Contact mechanics and friction processes in ultrasonic wire bonding-Basic theories and experimental investigations,  Journal of Sound and Vibration, p.115021
DOI: https://doi.org/10.1016/j.jsv.2019.115021

Nothdurft, S., Ohrdes, H., Twiefel, J., Wallascheck, J., Mildebrath, M., Maier, H. J., Hassel, T., Overmeyer, L., Kaierle, S. (2019): Influence of ultrasonic amplitude and position in the vibration distribution on the microstructure of a laser welded aluminum alloy,  Journal of Laser Applications 31

Aboulfotoh, N.; Twiefel, J. (2018): On developing an optimal design procedure for a bimorph piezoelectric cantilever energy harvester under a predefined volume,  Mechanical Systems and Signal Processing 106 (2018): 1-12

Andreas S. Schmelt, Viktor Hofmann, Eike C. Fischer, Marc C. Wurz, Jens Twiefel (2018): Design and characterization of the lateral actuator of a bimodal tactile display with two excitation directions,  Displays, Volume 54, September 2018, Pages 34-46 | File |
DOI: https://doi.org/10.1016/j.displa.2018.09.002

Bai, F., Saalbach, K.-A., Long Y., Twiefel, J., Wallaschek, J. (2018): Capability evaluation of ultrasonic cavitation peening at different standoff distances.,  Ultrasonics
DOI: /10.1016/j.ultras.2017.10.013

Fushi Bai, Kai-Alexander Saalbach, Liang Wang, Xiaogeng Wang, Jens Twiefel (2018): Impact of time on ultrasonic cavitation peening via detection of surface plastic deformation,  Ultrasonics
DOI: /10.1016/j.ultras.2017.12.001

Kai-Alexander Saalbach, Hendrik Ohrdes, Jens Twiefel (2018): Closed Loop Cavitation Control - A Step Towards Sonomechatronics,  Ultrasonics Sonochemistry
DOI: /10.1016/j.ultsonch.2018.01.021

Kai-Alexander Saalbach, Jens Twiefel, Jörg Wallaschek (2018): Self-sensing cavitation detection in ultrasound-induced acoustic cavitation,  Ultrasonics
DOI: /10.1016/j.ultras.2018.06.016

Long Y., Li Y., Sun J., Ille I., Li J., Twiefel J. (2018): Effects of process parameters on force reduction and temperature variation during ultrasonic assisted incremental sheet forming process,  The International Journal of Advanced Manufacturing Technology

Long, Y., Dencker, F., Isaak, A., Hermsdorf, J., Wurz, M., Twiefel, J. (2018): Self-Cleaning Mechanisms in Ultrasonic Bonding of Al Wire, Journal of Materials Processing Technology 258, pp. 58-66
DOI: https://doi.org/10.1016/j.jmatprotec.2018.03.016

Long, Y., Dencker, F., Isaak, A., Li, C., Schneider, F., Hermsdorf, J., Wurz, M., Twiefel, J., Wallaschek, J. (2018): Revealing of ultrasonic wire bonding mechanisms via metal-glass bonding,  Materials Science and Engineering: B
DOI: https://doi.org/10.1016/j.mseb.2018.11.010

Nothdurft, S.; Springer, A.; Kaierle, S.; Mildebrath, M.; Maier, H. J.; Hassel, T.; Ohrdes, H.; Twiefel, J.; Wallaschek, J.; Overmeyer, L. (2018): Laser welding of dissimilar low-alloyed steel-steel butt joints and the effects of beam position and ultrasound excitation on the microstructure,  Journal of Laser Applications 30, 3, 032417

Wang, L., Sun, W., Long, Y., Yang, X. (2018): Reliability-Based Performance Optimization of Tunnel Boring Machine Considering Geological Uncertainties, IEEE Access 6, pp. 19086 - 19098
DOI: 10.1109/ACCESS.2018.2821190

Aboulfotoh, N.; Twiefel, J. (2017): A Study on Bandwidth and Performance Limitations of Array Vibration Harvester Configurations,  Energy Harvesting and Systems

Aboulfotoh, N.; Twiefel, J.; Krack, M. ; Wallaschek, J. (2017): Experimental Study on Performance Enhancement of a Piezoelectric Vibration Energy Harvester by applying Self-Resonating Behavior,  Energy Harvesting and Systems, Oct. 2017
DOI: 10.1515/ehs-2016-0027

Bai, F., Saalbach, K.-A., Twiefel, J., & Wallaschek, J. (2017): Effect of different standoff distance and driving current on transducer during ultrasonic cavitation peening.,  Sensors and Actuators A: Physical.
DOI: /10.1016/j.sna.2017.05.002

Hofmann, V.; Twiefel, J (2017): Self-Sensing with Loaded Piezoelectric Bending Actuators, Sensors and Actuators A,  Physical, Volume 263, August 2017, Pages 737-743

Krack, M.; Aboulfotoh, N.; Twiefel, J.; Wallaschek, J.; Bergman, L.A.; Vakakis, A.F. (2017): Toward understanding the self-adaptive dynamics of a harmonically forced beam with a sliding mass,  Archive of Applied Mechanics

Long, Y.; Twiefel, J. and Wallaschek, J. (2017): A review on the mechanisms of ultrasonic wedge-wedge bonding,  Journal of Materials Processing Technology, 245, 2017, pp. 241-258

Ohrdes, H.; Ille, I.; Twiefel, J.; Wallaschek, J.; Nogueira, R.; Rosenwinkel, K. H. (2017): A control system for ultrasound devices utilized for inactivating E. coli in wastewater,  Ultrasonics Sonochemistry
DOI: 10.1016/j.ultsonch.2017.04.017

Wang, L.; Wielert, T.; Twiefel, J.; Jin, J.; Wallaschek, J. (2017): A Rod Type Linear Ultrasonic Motor Utilizing Longitudinal Traveling Waves: Proof of Concept,  Smart Materials and Structures, 26 (2017) 085013

Aboulfotoh, N.; Krack, M.; Twiefel, J.; Wallaschek, J. (2016): A Self-Resonant System-Experimental Investigations of Boundary and Operating Conditions,  PAMM 16, 1, pp. 253-254, October
DOI: 10.1002/pamm.201610115

Brouet, F.; Twiefel, J.; Wallaschek, J. (2016): Modal interaction in ultrasonic welding block sonotrodes induced by the mistuning of the material properties,  Journal of Sound and Vibration 318, pp. 1-13, October
DOI: 10.1016/j.jsv.2016.06.021

Bruns, P.; Mojrzisch, S.; Twiefel, J.; Wallaschek, J.; Zimmermann, U.; Klie, W. (2016): Prüfstand mit piezoelektrischen Schwingungserzeugern zur Ermittlung der dynamischen Steifigkeit von Elastomerbauteilen,  Forschung im Ingenieurwesen 80, 1-2, pp. 29-40 June
DOI: 10.1007/s10010-016-0204-y

Hofmann, V.; Twiefel, J.; Glukhovskoy, A.; Beringer, S.; Wurz, M. C.; Wallaschek, J.; Rissing, L. (2016): Intracochlear Stimulation of the Basilar Membrane,  Biomed Tech 61, p.179
DOI: 10.1515/bmt-2016-5014

Marhenke, T.; Twiefel, J.; Hasener, J. (2016): Transiente Ultraschallfeldvisualisierung von Transmissionsvorgängen an Platten auf Basis der Refraktovibrometrie,  TM – Technisches Messen 83, 10, pp. 580-592, October
DOI: 10.1515/teme-2016-0003

Saalbach, K.; Twiefel, J.; Wallaschek, J. (2016): 1945. Self-sensing cavitation detection capability of horn geometries for high temperature application,  Journal of Vibroengineering 18, 2, pp. 989-998, March

Van Drunen, W. J.; Hofmann, V.; Twiefel, J.; Glukhovskoy, A.; Beringer, S.; Wurz, M. C.; Rau, T. S.; Wallaschek, J.; Rissing, L.; Lenarz, L.; Majdani, O. (2016): Track P. Medical Implants/Implant Development,  Biomedical Engineering 61, 1, pp. 179-199
DOI: 10.1515/bmt-2016-5014
ISBN: ISSN (online) 1862-278X, ISSN (print) 0013-5585

Brouet, F.; Twiefel, J.; Wallaschek, J. (2015): Frequency veering and mode degeneration of a rectangular disc,  PAMM 15 (1), 175-176
DOI: 10.1002/pamm.201510078

Bruns, P.; Twiefel, J. (2015): Influences of Non-axial Process Loads on the Transducer and the Associated Mounting in Ultrasonic Machining,  Energy Harvesting and Systems
DOI: 10.1515/ehs-2014-0022
ISBN: ISSN (Online) 2329-8766, ISSN (Print) 2329-8774

Hofmann, V.; Kleyman, G.; Twiefel, J. (2015): Modeling and Experimental Investigation of a Periodically Excited Hybrid Energy-Harvesting Generator,  Energy Harvesting and Systems
DOI: 10.1515/ehs-2014-0043

Hofmann, V.; Twiefel, J. (2015): Optimization of a Piezoelectric Bending Actuator for a Tactile Virtual Reality Display,  Energy Harvesting and Systems

Saalbach, K.; Wurz, M. C.; Twiefel, J.; Rissing, L.; Wallaschek J. (2015): Custom Lithium Niobate Transducers for Detecting Material Distribution of Hybrid Workpieces,  Energy Harvesting and Systems. Band 2, Heft 3-4, Seiten 137–142
DOI: 10.1515/ehs-2014-0045
ISBN: ISSN (Online) 2329-8766, ISSN (Print) 2329-8774

Stehle, T.; Eisseler, R.; Drewle, K.; Weiland, S.; Bruns, P.; Twiefel, J. (2015): Investigation of Process Forces of Ultrasonically Assisted Scratch Tests,  Proceedings of the 3rd International Conference on Stone and Concrete Machining (ICSCM), November 2-3, Bochum, S. 137-145
DOI: 10.13154/icscm.3.2015.137-145

Heisel, U., Eisseler, R., Eber, R., Wallaschek, J., Twiefel, J., Huang, M. (2012): Ultrasonic-assisted machining of stone,  Production Engineering, 6 (2), pp. 587-594
DOI: 10.1007/s11740-011-0330-1

Wurpts, W.; Twiefel, J. (2012): Analysis of Ultrasonic Vibro-Impact Systems with Equivalent Circuits and the Harmonic Balance Method,  Sensors and Actuators A: Physical, Elsevier
DOI: 10.1016/j.sna.2012.10.007

Heisel, U.; Eber, R.; Wallaschek, J.; Twiefel, J. (2011): Kinematic model for ultrasonic-assisted manufacturing of bore holes with undefined cutting edges,  Journal of Advanced Materials Research 223 (2011), pp. 794 – 803
DOI: 10.4028/www.scientific.net/AMR.223.794

Neubauer, M.; Renner, A.; Twiefel, J. (2010): Stability Analysis of a Disc Brake with Piezoelectric Self-Sensing Technique,  SAE International Journal of Passenger Cars – Mechanical Systems, Vol. 2, No. 2, pp. 24-31
DOI: 10.4271/2009-01-3034
ISBN: 1946-4002

Arndt, M., Long, Y., Dencker, F., Reimann, J., Twiefel J., Wurz, M. (2020): Novel Piezoelectric Force Sensor Array for Investigation of Ultrasonic Wire Bonding,  Electronic Components and Technology Conference (ECTC), Jun. 3-30, Orlando, USA, pp.276-283
DOI: 10.1109/ECTC32862.2020.00053

Schmelt, A.S.; Li, Z.; Marhenke, T.; Hasener, J.; Twiefel, J. (2020): Aussagefähigkeit von Fehlstellenimitaten in der ZfP,  Tagungsband DAGA 2020 - 46. Jahrestagung für Akustik | File |
ISBN: 978-3-939296-17-1

A. S. Schmelt; E. C. Fischer; V. Hofmann; J. Twiefel; M. C. Wurz (2019): Vibro-tactile displays for stimulating surface impressions,  PROCEEDINGS of the 23rd International Congress on Acoustics 9 to 13 September 2019 in Aachen, Germany, pp. 1000-1007 | File |
ISBN: ISSN 2226-7808 and 2415-1599 ISBN 978-3-939296-15-7

A. S. Schmelt; T. Marhenke; J. Twiefel (2019): Identifying objects in a 2D-space utilizing a novel combination of a re-radiation based method and of a difference-image-method,  PROCEEDINGS of the 23rd International Congress on Acoustics 9 to 13 September 2019 in Aachen, Germany, pp. 8156-8163 | File |
ISBN: ISSN 2226-7808 and 2415-1599 ISBN 978-3-939296-15-7

Schneider, F., Long, Y., Ohrdes, H., Twiefel, J., Brökelmann, M., Hunstig, M., Venkatesh, A., Hermsdorf, J., Kaierle, S., Overmeyer, L. (2019): Effect of laser assistance in ultrasonic copper wire bonding,  Lasers in Manufacturing

A. S. Schmelt, E. C. Fischer, M. C. Wurz and J. Twiefel (2018): Solid State Joint Actuator for a Vibro Tactile Line Display,ACTUATOR 2018; 16th International Conference on New Actuators, Bremen, Germany, 2018, pp. 1-4,  VDE Verlag | File |
ISBN: 978-3-8007-4675-0

Behrens, B.A., Chugreev, A.; Matthias, T.; Nothdurft, S.; Hermsdorf, J.; Kaierle, S.; Ohrdes, H.; Twiefel, J.; Wallaschek, J.; Mildebrath, M.; Hassel, T. (2018): Investigation of the composite strength of hybrid steel-steel semi-finished products manufactured by laser beam welding and friction welding,  5TH INTERNATIONAL CONFERENCE of recent trends in structural materials (COMAT), 14.-16.11.2018, Pilsen
DOI: 10.1088/1757-899X/461/1/012049

Long, Y., He, B., Cui, W., Zhuang, X., Twiefel, J. (2018): Molecular dynamics simulation of microwelds formation and breakage during ultrasonic copper wire bonding,  IEEE 68th Electronic Components and Technology Conference
DOI: 10.1109/ECTC.2018.00219

Bruns, P.; Twiefel, J.; Wallaschek, J. (2017): Modeling of ultrasonic processes utilizing a generic software framework,  IOP Conference Series: Materials Science and Engineering, Vol. 211. No. 1, IOP Publishing, 2017

Fischer, E.; Glukhovskoy, A.; Schmelt, A., S.; Twiefel, J.; Wurz, M.,C. (2017): Mikroaktorik für ein Taktiles Display,  Proceedings of the MikroSystemTechnik Kongress 2017, October 23–25, 2017 München, S. 515-518

Hofmann, V.; Twiefel, J. (2017): Cultivator Optimization for Ultrasonic Friction Reduction using the Transfer Matrix Modeling Method,  The International Workshop on Piezoelectric Materials and Applications in Actuators, Falls Church, VA, USA

Long, Y.; Dencker, F.; Isaak, A.; Li, C.; Schneider, F.; Hermsdor, J.; Wurz, M.; Twiefel, J.; Wallaschek, J. (2017): Analysis of the Wire/Substrate Interface during Ultrasonic Bonding Process,  IEEE CPMT Symposium Japan (ICSJ), Nov 20-22, 2017 Kyoto, Japan, S. 203-206

Long, Y.; Dencker, F.; Isaak, A.; Schneider, F.; Hermsdor, J.; Wurz, M.; Twiefel, J. (2017): Visualization of Oxide Removal during Ultrasonic Wire Bonding Process,  19th IEEE Electronics Packaging Technology Conference (EPTC), Dec 6-9, 2017 Singapore, S. 1-4

Marhenke, T.; Twiefel, J.; Hasener , J.; Wallaschek, J. (2017): Ermittlung mechanischer Kennwerte von Holzwerkstoffen mittels Modal-Updating,  Proceedings der 35. CADFEM Simulation Conference, November 15-17, Koblenz, Deutschland

Marhenke, T.; Twiefel, J.; Hasener , J.; Wallaschek, J. (2017): Determination of Mechanical Properties of Wood Based Materials using Modal Updating,  Proceedings of the IEEE International Ultrasonics Symposium (IEEE IUS), September 6-9, Washingstion D.C., USA, 2017

Nothdurft, S.; Springer, A.; Kaierle, S.; Mildebrath, M.; Maier, H. J.; Hassel, T.; Ohrdes, H.; Twiefel, J.; Wallaschek, J.; Overmeyer, L. (2017): Influence of beam position and ultrasonic amplitude on the microstructure of laser welded dissimilar steel-steel joints,  International Congress on Applications of Lasers & Electro-Optics (ICALEO®), 22.-26.10.2017, Atlanta

Schneider, F.; Long, Y.; Ohrdes, H.; Twiefel, J.; Brökelmann, M.; Hunstig, M.; Venkatesh, A.; Hermsdorf, J.; Kaierle, S.; Overmeyer, L (2017): Effect of laser assistance in ultrasonic copper wire bonding ,  Lasers in Manufacturing Conference 2017

Aboulfotoh, N.; Twiefel J. (2016): A Study on the Influence of Design Parameters on the Power Output Characteristic of Piezoelectric Vibration Energy Harvester,  Proceedings of the 27th International Conference on Noise and Vibration Engineering, ISMA, Leuven

Bruns, P.; Twiefel, J.; Wallaschek, J. (2016): Experimental and Theoretical Investigation of a Vibro-Impact Process Utilizing an in situ Capacitive Distance Measurement,  Proceedings of ISMA2016 International Conference on Noise and Vibration Engineering, September 19-21, Leuven, Belgium

Long, Y.; Dencker, F.; Schneider, F.; Emde, B.; Li, C.; Hermsdorf, J.; Wurz, M.; Twiefel, J. (2016): Investigations on the Oxide Removal Mechanism during Ultrasonic Wedge-Wedge Bonding Process,  IEEE 18th Electronics Packaging Technology Conference, November 30 - December 3, Singapore, Southeast Asia, pp. 405-410

Long, Y.; Dencker, F.; Wurz, M.; Feldhoff, A.; Twiefel, J. (2016): A deeper understanding on the motion behaviors of wire during ultrasonic wedge-wedge bonding process,  International Symposium on Microelectronics, October 10-13, Pasadena, USA, pp. 427-432

Marhenke, T.; Twiefel, J.; Wallaschek, J. (2016): Zerstörungsfreie Delaminationserkennung mittels luftgekoppeltem Ultraschall,  Tagungsband der 14. Vibrometerkonferenz der Polytec GmbH: Einsatz Optischer Schwingungsmesstechnik in Industrie und Forschung, November 22-23, Waldbronn, Germany

Marhenke, T.; Twiefel, J.; Wallaschek, J. (2016): Delaminationserkennung in Holzwerkstoffen auf Basis der Ultraschalltransmissionsmessung,  Tagungsband des 3. Workshop des Fachausschusses Ultraschall der DEGA e.V.: Messtechnische Anwendungen von Ultraschall, June 20-22, Drübeck, Germany

Ohrdes, H.; Fischer, H.; Twiefel, J.; Wallaschek J. (2016): Experimental investigation of ultrasonic fluid mixing as assistance for a laser welding process,  Proceedings of ISMA2016: International Conference on Noise and Vibration Engineering, September 19-21, Leuven, Belgium, pp. 1595-1603

Schmidt, M.;Reinke, P.; Beckmann, T.; Saalbach, K. A.; Wallaschek, J.; Twiefel, J.; Bai, F. (2016): Numerical and experimental investigation of the levitation and flow created by ultrasonic fields in narrow gaps,  5th Micro and Nano Flows Conference

Wielert, T.; Vagapov, A.; Twiefel, J.; Mešan, I.; Bott, K. (2016): Performance of a Novel Small Component Conveyor Utilizing Flexural Travelling Waves,  Conference Proceedings of ACTUATOR 2016, 15th International Conference on New Actuators, June 13-15, Bremen, Germany

Bruns, P.; Mojrzisch, S.; Twiefel, J.; Wallaschek, J.; Klie, W.; Zimmermann, U. (2015): Piezoelektrische Schwingungserzeuger zur Ermittlung der dynamischen Steifigkeiten von Elastomerbauteilen,  VDI Mechatroniktagung, Dortmund

Bruns, P.; Twiefel, J.; Wallschek, J. (2015): Investigations on the Mounting Position of Ultrasonic Transducers,  The 12th International Workshop on Piezoelectric Materials and Applications in Actuators, Vilnius

Ertz, G.; Krack, M.; Twiefel, J.; Secanell, M.; Mertiny, P. (2015): Skalierbarer Demonstrator für Mobile Schwungradspeichersysteme,  VDI Mechatroniktagung, März 12-13, Dortmund, Deutschland

Ertz, G.; Twiefel, J.; Secanell, M.; Mertiny, P. (2015): Design and Manufacturing of a Scalable Composite Flywheel Demonstrator for Mobile Energy Storage System,  CANCOM, August 17-20, Edmonton, Canada

Long, Y.; Twiefel, J.; Roth, J.; Wallaschek, J. (2015): Real-time observation of interface relative motion during ultrasonic wedge-wedge bonding process,  In International Symposium on Microelectronics, IMAPS (International Microelectronics, Assembly and Packaging Society), pp. 419-424

Weinstein, M.; Ille, I.; Mojrzisch, S.; Twiefel, J.; Wallaschek, J. (2015): Resonance Frequency Tuning of Piezoelectric Ultrasonic Transducers Using Resonant Switching Converters,  Third International Academic Conference of Postgraduates, NUAA, Nanjing, China

Wielert, T.; Twiefel, J.; Mešan, I.; Bott, K. (2015): Kleinteileförderung mit einem ultraschallbasierten Wanderwellentransportsystem,  Tagungsband Mechatronik 2015
ISBN: 978-3-00-048814-6

Bruns, P.; Mojrzisch, S.; Twiefel, J. (2013): Stress Distribution and Durability of Pre-Stressed Piezoelectric Multilayer Actuators,  10th International Workshop on Piezoelectric Materials and Applications, Hannover, Germany

Roth, J.; Twiefel, J.; Wallaschek, J. (2013): Energy Harvesting Patents 2012,  Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop, Hannover, Germany

Saalbach, K.; Freytag, P.; Kerber, K.; Twiefel, J. (2013): Bond Quality Investigation of Ultrasonic Assisted Composite Casting,  Proceedings of 10th International Workshop on Piezoelectric Materials and Applications and 8th Energy Harvesting Workshop, July 14-17, Hannover, Germany
ISBN: 978-3-944586-10-6

Saalbach, K.; Freytag, P.; Kerber, K.; Twiefel, J. (2013): Ultrasonic Assisted Simultaneous Composite Casting – a Feasibility Study,  Ultrasonics Symposium (IUS), 2012 IEEE International-Proceedings

Wallaschek, J.; Saalbach, K.; Twiefel, J. (2013): Soundfield Design for Ultrasonically Assisted Composite Casting,  Proceedings of 11th International Conference on Vibration Problems

Wurpts, W.; Bruns, P.; Twiefel, J. (2013): A Transfer Matrix Method for the Design of Resonant Piezoelectric Devices,  10th International Workshop on Piezoelectric Materials and Applications, Hannover, Germany

Bruns, P.; Mojrzisch, S.; Twiefel, J.; Wallaschek, J. (2012): Autoresonant Control of an Electromagnetic Linear Actuator with Piecewise-Linear Restoring Force,  13th Mechatronics Forum International Conference, Linz, Austria

Mojrzisch, S.; Ille, I.; Twiefel J. (2012): Driving methods and control design for high power ultrasonic transducers,  9th International Workshop on Piezoelectric Materials and Applications in Actuators, Hirosaki, Japan

Neubauer, M.; Twiefel, J.; Westermann, H.; Wallaschek, J. (2012): Modeling Aspects of Nonlinear Energy Harvesting for Increased Bandwidth,  Small-Scale Energy Harvesting, Edited by M. Lallert, InTech, Chapter 13
DOI: 10.5772/52232
ISBN: 978-953-51-0826-9

Richter, B.; Twiefel, J.; Wallaschek, J. (2009): Piezoelectric Equivalent Circuit Models,  In: Priya, S.; Inman, D. J. (Hrsg.): Energy Harvesting Technologies, pp. 107-128
DOI: 10.1007/978-0-387-76464-1_4
ISBN: 978-0-387-76463-4

Ohrdes, H.; Twiefel, J. ; Wallaschek, J.; Nogueira, R.; Rosenwinkel, K. H. (2016): A feasibility study on the use of ultrasound for inactivating E. Coli in raw and treated wastewater,  2nd International Conference on Ultrasonic-based Applications: from analysis to synthesis - Ultrasonics 2016

B. Richter; J. Twiefel; T. Hemsel; J. Wallaschek (2006): Model Based Design of Piezoelectric Generators Utilising Geometrical and Material Properties

Marin, A.; Heitzmann, P.; Twiefel, J.; Priya, S. (2012): Improved pen harvester for powering a pulse rate sensor,  Proc. of SPIE Vol. 8341, 83411D-1

Kattenstroth, R.; Harms, H.-H.; Wurpts, W.; Twiefel, J.; Wallaschek, J. (2011): Reibkraftreduktion mittels Ultraschallanregung in der Bodenbearbeitung,  Landtechnik Band 66 Heft 1, pp. 10-13
DOI: 10.15150/lt.2011.341

Zhao, S.; Twiefel, J.; Wallaschek, J. (2009): Design and experimental investigations of high power piezoelectric transducers for a novel squeeze film journal bearing,  Proc. SPIE, Vol. 7288, Active and Passive Smart Structures and Integrated Systems, San Diego, CA, USA

Twiefel, J.; Klubal, M.; Paiz, C.; Mojrzisch, S.; Kruger, H. (2008): Digital signal processing for an adaptive phase-locked loop controller,  Proc. SPIE 6926, 69260A
DOI: 10.1117/12.776091

Twiefel, J.; Potthast, C.; Mracek, M.; Hemsel, T.; Sattel, T.; Wallaschek, J. (2008): Fundamental Experiments as Benchmark Problems for modeling Ultrasonic Micro-Impact Processes,  Journal of Electroceramics, 2008, 20 (3-4), S. 209-214
DOI: 10.1007/s10832-007-9169-4

Twiefel, J.; Richter, B.; Sattel, T.; Wallaschek, J. (2008): Power Output Estimation and Experimental Validation for Piezoelectric Energy Harvesting Systems,  Journal of Electroceramics, 2008, 20 (3-4), S. 203-208
DOI: 10.1007/s10832-007-9168-5

Potthast, C.; Twiefel, J.; Wallaschek, J. (2007): Modeling Approaches for an Ultrasonic Percussion Drill,  Journal of Sound and Vibration, S. 405-417

Potthast, C.; Twiefel, J.; Wallaschek, J. (2007): Model based Analysis of an Ultrasonic Percussion Drill,  In: ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering

Richter, B.; Twiefel, J.; Hemsel, T.; Wallaschek, J. (2007): Model Based Design of Piezoelectric Generators Utilising Geometrical and Material Properties,  2006 International Mechanical Engineering Congress & Exposition (IMECE 2006), 5-10 November, Chicago, Illinois, USA

Richter, B.; Twiefel, J.; Sattel, T.; Wallaschek, J. (2007): Design Method for Piezoelectric bending Generators in Energy Harvesting Systems,  In: Active and Passive Smart Structures and Integrated Systems 2007, San Diego, USA, SPIE, 2007, Bd. 6525, Nr. 652504

Twiefel, J.; Potthast, C.; Mracek, M.; Hemsel, T.; Sattel, T.; Wallaschek, J. (2007): Fundamental Experiments as Benchmark Problems for modelling Ultrasonic Micro-Impact Processes,  Journal of Electroceramics
DOI: 10.1007/s10832-007-9169-4
ISBN: ISSN 1385-3449

Twiefel, J.; Richter, B.; Sattel, T.; Wallaschek, J. (2007): Power output Estimation and Experimental Validation for Piezoelectric Energy Harvesting Systems,  In: Journal of Electroceramics
DOI: 10.1007/s10832-007-9168-5
ISBN: ISSN 1385-3449