Speaker
Description
The successful development of ultrasonic drives, e.g. for high-precision positioning, requires a thorough understanding of the material behavior of the piezoceramics utilized. In particular, the material behavior during dynamic high-power operation at high resonance frequencies and large vibration amplitudes plays a decisive role. The microstructure experiences high loading rates at high cyclic mechanical stress magnitudes. The experimental findings indicate that the material reacts by dissipating energy while simultaneously heating. This phenomenon can be attributed to internal friction effects and/or domain switching processes. In order to enhance the operational efficiency of ultrasonic drives, micromechanical material models can be used to predict the behavior of the piezoceramic. This model approach attempts to represent the macroscopic phenomenological material behavior by considering the microscopic processes occurring within the microstructure. With this information in hand, an attempt can be made to attribute the experimentally observed performance losses and the actuator heating to processes in the material. The micromechanical modeling approach is introduced and a concept for an efficient integration into a reduced modeling framework of an ultrasonic drive system is presented.
