Wolfgang Seemann

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In this paper, a new longitudinal and torsional type ultrasonic motor with two stators is presented and investigated. Normally, such a motor consists of one rotor and one stator, and two types of transducers that are longitudinal PZT and torsional PZT are used to generate the desired elliptical locus on the stator surface. The operating frequency is at the(More)
The paper describes a method to compute the minimal-time trajectory for an autonomous vehicle driving at the force contact limit. It is proven that the optimal trajectory consists piecewise of logarithmic spirals and not of cothoids as is often thought. Simulation results are given for the interesting special case of a needle turn. These results are(More)
This paper presents a method to optimize the energy efficiency of walking bipedal robots by more than 50 % in a speed range from 0.3 to 2.3m/s using elastic couplings – mechanical springs with movement speed independent parameters. The considered robot consists of a trunk, two stiff legs and two actuators in the hip joints. It is modeled as underactuated(More)
Perforated and porous membranes are often used in various engineering applications. As an example, they can serve for microand nanofiltering purposes in micro-electromechanical systems (MEMS). Investigated membranes are made from very thin perforated silicon-nitride (SiN) on a porous polysilicon (PS) layer, which is supported and reinforced by(More)
This paper presents a method to optimize the energy efficiency of walking bipedal robots by more than 80 % in a speed range from 0.3 to 2.3 m/s using elastic couplings – mechanical springs with movement speed independent parameters. The considered planar robot consists of a trunk, two two-segmented legs, two actuators in the hip joints, two actuators in the(More)
In recent years, the techniques for fabricating micro-electromechanical systems (MEMS) have improved to the point that wide scale use of these components is possible. And, while a few micro-scale devices have been implemented in commercial applications, they have barely scratched the surface of their potential. That leaves the obvious question: why haven’t(More)