Abstract
Recently smart structures using piezoelectric elements as sensors and actuators of vibration control have been studied. Design and analysis of such smart structure is a multidisciplinary problem that consists of mechanical, electrical and control problem. Therefore, multidisciplinary modeling technique is desired for study of smart structure. However, conventional model of mechanical system is incompatible with model of electrical system. Block diagram can model mechanical and electrical system in generalised form. However physical quantities are treated just as signals and it is not easy to understand physical phenomenon from signal flow in block diagram. Functional model is proposed as a modeling method of multidisciplinary system and can solve the above mentioned problems of conventional models. Functional models of basic elements of mechanical and electrical system, for example, mass, stiffness, capacitor, inductor and DC motor have been developed. However, functional model of piezoelectric element has not been developed. In this paper, functions of piezoelectric element are considered and functional model of piezoelectric element is developed to apply functional model to smart structure system. Energy flow in the energy regenerative vibration control system that have been studied by authors is simulated by functional model and the result is compared with the result of the previous simulation using equivalent circuit model.
