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Influence of different parameters on stiffness characteristics of cross-spring flexure pivots

Published:2023-11-27 author:ZUO Haochen, LIANG Song, YAN Ming. Browse: 242 Check PDF documents

Influence of different parameters on stiffness characteristics of

cross-spring flexure pivots

ZUO Haochen1,2, LIANG Song1,2, YAN Ming1,2

(1.School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China;

2.Engineering

Research Center of Impact Protection and Damage Assessment Technology of Liaoning Province, Shenyang 110870, China)

Abstract: In terms of analysing the stiffness characteristics of flexure pivots, current analysis methods mostly focus on the stiffness characteristics of linear small deformations of flexure pivots, and do not comprehensively consider the influence of different parameters on the stiffness of flexure pivots. In order to solve the problem of insufficient research methods for the stiffness characteristics of large deformation cross-spring flexure pivots, three analysis methods were adopted: theoretical analysis, finite element simulation, and experimental measurement to study the stiffness characteristics of flexure pivots. Firstly, a theoretical analysis of the cross-spring flexure pivots based on Euler Bernoulli beam was carried out, a nonlinear large deformation mechanics model was established and solved by L-M numerical iteration method, the vertical, horizontal stiffnesses and rotational stiffnesses of the crossspring flexure pivots were analyzed, and the effects of different geometric parameters and loads on the stiffness were researched. Then, seven different sets of flexure pivots parameters were selected, the finite element analysis models of flexure pivots were established, and a flexure pivot stiffness measurement platform with adjustable geometric parameters and composite loads was designed. Finally, the stiffness characteristics were further analyzed and researched using three methods: theoretical analysis, finite element simulation and experimental measurements. The research results show that the overall error of the three methods for the stiffness analysis of the flexure pivot is less than 9%, which proves the effectiveness of the proposed methods. Among them, the rotational stiffness is much smaller than the horizontal and vertical stiffness, and the nonlinearity arises with the increase of the load. About influencing factors, the horizontal load and the crossover coefficient have a greater influence on the rotational stiffness, while the vertical load and the crossover angle have a smaller influence. The research results provide some reference significance for the application of large deformation flexure pivots in vibration isolation systems.

Key words: chain transmission; vibration isolation system; cross-spring flexure pivots; nonlinear large deformation; stiffness characteristics analysis methods; rotational stiffness

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