3-PRS并联机构的有限元分析  

Finite element analysis of 3-PRS parallel mechanism

作　　者：陈国强[1] 杨志飞 CHEN Guoqiang,YANG Zhitei(School of mechanical and power engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China)

机构地区：[1]河南理工大学机械与动力工程学院,河南焦作454000

出　　处：《河南理工大学学报（自然科学版）》2018年第4期82-89,共8页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(U1304525);河南省科技攻关项目(172102310664;132102210430);河南省高校基本科研业务费专项资金资助项目(NSFRF170913)

摘　　要：针对3-PRS并联机构在工作中受力变形且传递关系复杂的问题,提出利用有限元分析方法来研究变形的分布特征。根据逆向运动学原理得到动平台处于不同位姿下的机构参数,利用三维建模软件建立3-PRS并联机构在不同位姿状态下的实体模型,运用有限元分析软件对模型进行静力学与模态分析。通过静力学分析,得到并联机构的等效变形与应力分布;通过模态分析,得到并联机构的固有频率与振型,分析了并联机构的固有频率与振型对机构在工作状态中的影响。研究结果为3-PRS并联机构的相关试验与动力学分析计算及结构的优化设计提供了参考依据。Aiming at the problem of complex transfer relationship of force and deformation in the 3-PRS parallel mechanism,the finite element method is used to study the deformation distribution. The mechanism parameters of the moving platform are obtained based on the principle of inverse kinematics in different postures. The solid model of the 3-PRS parallel mechanism in different postures is established by using 3D modeling software. The finite element analysis software is utilized to analyze the statics and modals of the model. The equivalent deformation and stress distribution of the parallel mechanism are obtained through the statics analysis,while the natural frequency and vibration type of the parallel mechanism are obtained through the modal analysis. In addition,the influences of the natural frequency and vibration type of the parallel mechanism on the working state of the mechanism are discussed. The results can establish foundations for the relevant experiments,dynamic analysis and calculation as well as the structure optimization design for the 3-PRS parallel mechanism.

关 键 词：3-PRS并联机构 有限元分析 逆向运动学 静力学分析 模态分析 

分 类 号：TP242.2[自动化与计算机技术—检测技术与自动化装置]