移动副间隙对两自由度平面机构非线性动力学的影响  

Influence of Slider Joint with Clearance on Nonlinear Dynamics of Planar Mechanism with Two Degrees of Freedom

作　　者：午丽娟[1] 

机构地区：[1]上海电机学院机械学院,上海201306

出　　处：《上海电机学院学报》2017年第5期249-254,共6页Journal of Shanghai Dianji University

基　　金：上海市网络化制造与企业信息化重点实验室开放课题资助(KT20150902)

摘　　要：对含间隙移动副的机构非线性动力学行为进行了分析研究。建立了间隙元素非线性接触碰撞力模型,其正向接触力采用Hertz弹性力和能量耗散项表征,切向力则由改进的库仑摩擦力表征;对不同间隙值条件下机构动力学性能进行了仿真分析。结果表明,机构运动稳定性和精度随着间隙值的增大而降低;相图和庞加莱截面进一步显示,随着间隙值的增大,机构运动具有从周期趋向混沌的非线性特性。In this study,the influence of joint clearance on the dynamic response of a mechanism with two degrees of freedom is investigated.A nonlinear dynamic model of clearance was built.The normal contact force was characterized by Hertz contact theory and an energy dissipation term.A tangential friction force was built based on Coulomb's friction law.Dynamic simulation was carried out at different clearance sizes of the slider joint.The simulation results indicate that precision and stability of the system's motion decrease as the clearance size increases.Furthermore,the phase plane and Poincarésection exhibit that the system has a tendency to move from periodic to chaotic as the clearance size increases.

关 键 词：移动副间隙 动力学响应 非线性特性 

分 类 号：TH122.1[机械工程—机械设计及理论]