基于位移控制法的被动恒力夹持机构非线性有限元求解  

Nonlinear Finite Element Solution of Passive Constant Force Mechanism Based on Displacement Control Method

作　　者：梁展沛 苗玉彬[1] LIANG Zhanpei;MIAO Yubin(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 201100,China)

机构地区：[1]上海交通大学机械与动力工程学院,上海201100

出　　处：《机械设计与研究》2024年第4期12-17,共6页Machine Design And Research

基　　金：国家自然科学基金资助项目(51975361)。

摘　　要：无需驱动控制的被动式恒力夹持机构对果蔬的无损采摘具有重要意义。恒力夹持机构设计困难,采用拓扑优化方法可以降低设计盲目性。而此类设计依托非线性有限元分析。考虑机构大变形引入的几何非线性,以及采用超弹性材料而引入的材料非线性,建立了二维网格模型以及受位移载荷输入的平衡迭代方程,并给出了针对此类问题的位移控制法求解方法,并与基于微分方程求解的类比算法进行比较。计算表明本算法流程对此类位移输入的非线性问题求解具有较高的效率和精确性,并可为后续的恒力夹持机构的拓扑优化设计提供数值计算基础。The passive constant force mechanism(CFM)without drive control is of great significance for non-destructive harvesting of fruits and vegetables.Adopting topology optimization methods can reduce design difficulties of these mechanisms,which relies on nonlinear finite element analysis.For the finite element analysis(FEA)in optimization iteration,the introduction of geometric nonlinearity from large structural deformation and material nonlinearity from the adopted hyperelastic materials is considered,and a two-dimensional mesh model and a balanced iteration equation under displacement load input are established.For the equation solving,the displacement control method(DCM)is used and compared with analog algorithms based on differential equation solving methods.The result shows that the algorithm proposed in this paper has high efficiency and accuracy in solving nonlinear problems with such displacement inputs.And such method can provide a numerical calculation basis for the topology optimization design of constant force clamping mechanisms in the future.

关 键 词：恒力机构 非线性有限元分析 超弹性材料 位移控制法 

分 类 号：TH112[机械工程—机械设计及理论]