Design and optimization of a pre-stressed piezoelectric actuator based on compliant arc-beam mechanism

Over recent years, the piezoelectric materials are of interest due to their fast response, high precision, high output loads and compact sizes. On the other hand, due to the high sensitivity of piezoelectric materials to tensile and shear stresses, it is necessary to apply preload on these materi-als using. In this paper, a novel pre-stressed piezoelectric actuator based on compliant arc-beam mechanisms is designed and optimized. Dynamic governing equations based on spring-mass model are obtained using Hamilton’s principle. To maximize the fundamental natural frequency and min-imize the mass of the frame, the geometric parameters of the frame are optimized by multi-objective genetic algorithm (MOGA) which is conducted by multi-disciplinary MODFRONTIER software. Using ANSYS finite element software, a model of piezoelectric actuator is created to calculate stresses and natural frequencies. Then, by solving analytically the governing equations and using optimal geometrical parameters, the axial natural frequencies and the effect of harmonic accelera-tions and excitation voltage of piezoelectric stack on each other over a frequency range are investi-gated.

کلیدواژه ها:

Pre-stressed actuator ، Piezoelectric ، Compliant mechanism ، Optimization.