Reinhard Lerch

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A method for the analysis of piezoelectric media based on finite-element calculations is presented in which the fundamental electroelastic equations governing piezoelectric media are solved numerically. The results obtained by this finite-element calculation scheme agree with theoretical and experimental data given in the literature. The method is applied(More)
Many surface acoustic wave (SAW) devices consist of quasiperiodic structures that are designed by successive repetition of a base cell. The precise numerical simulation of such devices, including all physical effects, is currently beyond the capacity of high-end computation. Therefore, we have to restrict the numerical analysis to the periodic substructure.(More)
Many sensors and actuators in technical systems consist of quasiperiodic structures which are constructed by successive repetition of a base cell. Typical examples are piezoelectric composites used as ultrasonic transducers or surface acoustic wave (SAW) devices utilized in telecommunication systems. The precise numerical simulation of such devices(More)
Todays data sets arising from computational mathematics are extremely large which poses increasing demands for performance (in the sense of graphics-performance) on interactive visu-alization systems. " Real-time " interaction interfaces have proven useful for the analysis of these data sets, but real-time performance has been difficult to achieve with such(More)
A two layer ultrasonic stack transmitter made of a ferroelectret material with a diameter of 1.5 cm was developed for emitting a chirp signal with a sound pressure level of more than 90 dB at a distance of 1 m for an artificial bat head. Compared to a single layer transmitter, the resonance frequency of a two layer stack actuator is shifted down to 100 kHz.(More)
Understanding vocal fold dynamics presents an essential part in treating voice disorders as it is the prerequisite to appropriate medical therapy. Various physical and numerical models exist for simulation purposes, all relying on simplified material parameters. To improve current approaches, data of realistic tissue behavior, i.e., in natural surroundings,(More)
This paper summarizes the results of a series of performance tests carried out as part of an evaluation of diierent graphics workstations. The graphics performance was determined by Viewperf 5.1. In addition, we present some results of a relatively simple graphics benchmark, which measures the raw performance with regard to Gouraud-shading. In order to get(More)