Optimal Design of a Compliant Two-stage Differential Displacement Amplification Mechanism

doi:10.3901/JME.2019.21.021

Abstract

Abstract: Micro-displacement amplification mechanisms are frequently used to increase the stroke range of the piezoelectric actuator, and the differential micro-displacement amplification mechanism has the feature of large amplification ratio and small structure. Therefore, this paper presents a novel two-stage differential micro-displacement amplification mechanism. Kinetostatic analysis of the mechanism is carried out by using the matrix representation. A bi-objective optimization model is established aiming at improving the displacement amplification ratio and reducing the maximum stress. The mechanism is optimized to achieve a displacement magnification of up to 48 times, and the finite element simulation analysis is performed, its calculation result is 44 times, so the error between the theoretical model and the finite element model is less than 10%. The results show that the proposed optimization model is accurate and efficient, and can also be applied to the optimization design of other flexure-based compliant mechanisms.

Key words: displacement amplification mechanism, flexure hinge, matrix representation, kinetostatic analysis, optimal design

CLC Number:

TH122

LI Jiajie, CHEN Guimin. Optimal Design of a Compliant Two-stage Differential Displacement Amplification Mechanism[J]. Journal of Mechanical Engineering, 2019, 55(21): 21-28.

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