Abstract
The piezoelectric actuator is a voltage spring system that behaves in a similar characteristic to mechanical mass spring system. The displacements profile of the piezoelectric actuator shifts due to hysteresis and creep during actuation. The static (non-dynamics) models of piezoelectric actuator developed in the past consisted of a number of equations which could not be simplified in the form of a single transfer function. Furthermore, the modelling of dynamic (vibrating) piezoelectric actuator was not considered. In this work, we present the behaviour of the piezoelectric actuator in terms of mechanical displacement from applied electric potential. The single transfer function mathematical model is generated representing the actuator characteristics. The dynamic (vibration) model that can vibrate at a desired frequency of the actuator is also developed. The models are developed by system identification from experimental results. A high resolution microscope together with the image processing technique were used to obtain the system characteristics. Simulation using Matlab Simulink is used to validate the experiment (The hysteresis was reduced by 90 % and the vibration was reduced to 97 %).
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