J
Jörg Wallaschek
Researcher at Leibniz University of Hanover
Publications - 266
Citations - 3870
Jörg Wallaschek is an academic researcher from Leibniz University of Hanover. The author has contributed to research in topics: Vibration & Ultrasonic motor. The author has an hindex of 29, co-authored 251 publications receiving 3442 citations. Previous affiliations of Jörg Wallaschek include Hella & Princeton University.
Papers
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Contact mechanics of piezoelectric ultrasonic motors
TL;DR: In this paper, the authors summarize the state of the art in the understanding of some fundamental processes governing the contact mechanics of piezoelectric ultrasonic motors and present a survey of publications devoted to the subject.
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Travelling wave ultrasonic motors, part i: working principle .and mathematical modelling of the stator
Peter Hagedorn,Jörg Wallaschek +1 more
TL;DR: In this article, the working principle of traveling wave ultrasonic motors is reviewed and the main phenomena are mathematically modelled, and a detailed mathematical description of the stator vibration and a first model of the contact problem is given.
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Pantograph/Catenary Dynamics and Control
TL;DR: In this paper, an overview of the methods to describe the catenary and the pantograph system dynamics is presented, including the interaction between current collectors and overhead equipment, the acquisition of the model data and the verification are presented.
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The effect of friction reduction in presence of ultrasonic vibrations and its relevance to travelling wave ultrasonic motors
TL;DR: It is shown that Coulomb's friction law provides a very good description of the observed phenomena if the kinematics of the system is taken into account and therefore the validity of Coulomb’s friction law even for ultrasonic conditions is shown.
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Sliding friction in the presence of ultrasonic oscillations: superposition of longitudinal oscillations
TL;DR: In this paper, a simple theoretical model for friction in the presence of ultrasonic oscillations is derived theoretically and validated experimentally, and the model is capable of predicting the reduction of the macroscopic friction force as a function of the ultrasonic vibration frequency and amplitude and the macro-scopic sliding velocity.