The design of the multicomponent ultrasonic actuators on the basis of mode - frequency analysis

Abstract

Really important problem in designing process of ultrasonic motors is achieving optimum of the geometrical parameters of multicomponent ultrasonic actuators. Ultrasonic actuators are resonance systems, operating in one of the frequencies closed to the resonance. Effective job of ultrasonic motor usually depends not on particular frequency of multicomponent actuator, but on distribution of resonance 1 frequencies i. e. how close resonance frequencies are each other on the axis of frequencies. These facts are very important in case of Multicomponent oscillations of the actuator that is analysed in this paper. Usually numerical modelling and simulation of multicomponent piezoelectric actuators lead to the large number of recurred calculations with different geometrical parameters of the actuator and to the problems concerning the changes of modal shape sequences during recurred calculations. Analysis of the modal shapes sequences exchanges of cylinder - shape piezoelectric actuators were done. Dependencies and characteristic ratios of geometrical parameters of the analysed piezoelectric actuators were defined when modal shape sequences changes.