拓扑优化设计双稳态机构特性  

Topology Optimization Design Characteristics of Bistable Mechanisms

作　　者：沈宇平 谭双峰 潘殿坤 李泽阳 伍章明 SHEN Yuping;TAN Shuangfeng;PAN Diankun;LI Zeyang;WU Zhangming(School of Mechanical Engineering and Mechanics,Ningbo University,Ningbo 315211,Zhejiang,China;School of Engineering,Cardiff University,Cardiff CF243AA,UK)

机构地区：[1]宁波大学机械工程与力学学院,浙江宁波315211 [2]卡迪夫大学工程学院,卡迪夫CF243AA

出　　处：《机械科学与技术》2025年第2期255-261,共7页Mechanical Science and Technology for Aerospace Engineering

基　　金：博士后科学基金项目(2020M681805)。

摘　　要：双稳态机构由于其独特的特性,在可展开机构、微开关领域被广泛运用。对于双稳态机构,其抗干扰能力是至关重要的,最大和最小反作用力是决定机构抗干扰能力的关键参数。为提高双稳态机构的抗干扰能力,以最大和最小反作用力为优化目标,使用拓扑优化的方法将两端固支的梁结构设计成双稳态机构。通过数学软件MATLAB与仿真软件ABAQUS相结合进行拓扑优化。拓扑优化过程中由于非线性拓扑优化灵敏度分析难以提取,使用灵敏度的近似表达。为防止在有限元分析过程中出现不收敛的情况发生,在单元中添加超弹性的附加材料。使用有限元仿真提取优化目标力位移响应以及敏度近似表达式所需要的单元应变能。通过有限元分析和实验研究,证实了该拓扑优化设计方法的有效性。Due to their unique characteristics,bistable mechanisms are widely used in many applications such as deployable mechanisms and microswitches.Anti-interference capability of bistable mechanism is crucial,and the maximum and minimum reaction forces are the key parameters to determine the anti-interference capability of the mechanism.In order to improve the anti-interference capability of the bistable mechanism,a beam structure with double fixed ends is designed as a bistable mechanism by using the topology optimization method with the maximum and minimum reaction forces as the optimization objectives.The topology optimization is carried out by combining the software MATLAB with simulation software ABAQUS.Due to the difficulty of extracting the nonlinear topology optimization sensitivity analysis,an approximate expression of the sensitivity is used in the process of topology optimization.In order to prevent the occurrence of non-convergence during the finite element analysis,additional hyperelastic materials are added in the unit.Finite element simulation is used to extract the force displacement response as an optimization objective and strain energy of unit used as Approximate expression of sensitivity.The feasibility of the topology optimization design method is confirmed with the finite element analysis and experimental test.

关 键 词：双稳态 反作用力 拓扑优化 敏度 超弹性 

分 类 号：TH122[机械工程—机械设计及理论]