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A New Static And Dynamic Model For Bridge-Type Displacement Amplifier For Use In Piezoelectric Actuators

This paper proposes an extended dynamic stiffness model for the concurrent kinetostatic and dynamic analyses of the piezoelectric actuated bridge-type displacement amplifier. At first, the bridge-type displacement amplifier is discretized into rigid bodies, flexure hinges and lumped mass. Then, in order to consider the geometric effect of rigid bodies, the extended dynamic stiffness matrix of each flexure hinge is built by shifting the end node to the mass center of rigid body. Finally, the whole dynamic stiffness model is established by selecting the hybrid displacements at the mass center of rigid bodies as the state variables. Moreover, by comparing with other theoretical method and the finite element simulation, the proposed model exhibits the advantages of easy operation and high prediction accuracy.