基于模态应变能灵敏度的数控机床床身结构分析与优化  

Analysis and Structural Optimization of Bed Structure for CNC Lathe Based on Modal Strain Energy Sensitivity

作　　者：徐广晨 孙兴伟[1] XU Guangchen;SUN Xingwei(Mechanical Engineering College,Shenyang University of Technology,Shenyang Liaoning 110870,China;Mechanical and Power Engineering College,Yingkou Institute of Technology,Yingkou Liaoning 115014,China)

机构地区：[1]沈阳工业大学机械工程学院,辽宁沈阳110870 [2]营口理工学院机械与动力工程系,辽宁营口115014

出　　处：《机床与液压》2020年第3期146-149,共4页Machine Tool & Hydraulics

基　　金：国家自然科学基金资助项目(50475170);辽宁省自然科学基金指导计划(2018011261-301)。

摘　　要：基于床身有限元模型进行模态分析,选取1阶模态下模态应变能集中的位置,引入灵敏度分析方法对床身的设计尺寸进行优化。优化结果表明:优化后1阶模态应变能分布均匀,降低了床身质量,同时可以减少结构优化的盲目性,提高优化效率。文中的优化设计过程与方法可推广到机床其他部件的结构动态性能优化中,从而为机床整体结构动态特性的改进、优化设计提供了重要的方法和理论依据。Based on the modal analysis of the finite element model( FEM) of the machine bed,the position of the modal strain energy concentration in the first mode is selected,and the sensitivity analysis method is used to optimize the design size of the bed. The optimization results show that the first-order modal strain energy can be distributed evenly after optimization,and the quality of the bed can be reduced. At the same time,the blindness of structural optimization can be reduced and the optimization efficiency can be improved. This optimization design process and method can be extended to other machine tool parts,and provide the important approach and theory reference for machine tool dynamic characteristics improvement and structure optimization.

关 键 词：床身 模态应变能 灵敏度 结构优化 

分 类 号：TH122[机械工程—机械设计及理论]