Abstract: To improve the efficiency and quality of machine tools design and analysis,a sensitivity-based integrated multi-level method was proposed.The weakest spot was found by modal experiments,and the sensitive dimension of meta structure and key components based on the sensitivity analysis were taken as the design parameters to make optimization.On this basis,the sizes and distribution form of joint parts were analyzed aiming at improving the dynamic performance.The whole machine was checked and improved from the viewpoint of modal matching and cutting frequency forbidden zone,and the multi-level optimization with the least modification was realized which included unit structure,key component,joint parts and whole machine.The proposed method was verified in the design of a horizontal machine center.

Key words: sensitivity, modal analysis, natural frequency, modal matching

摘要： 为提高机床产品结构设计分析的效率与质量,提出一种多层次集成设计方法。根据模态实验找出机床结构的薄弱环节,采用灵敏度分析确定元结构和关键部件的敏感尺寸作为设计参数进行优化。以提高动态性能为目的对联接部件的尺寸和分布形式进行分析;从模态匹配、切削频率禁区的角度对整机进行动力学校核,最终以较小的修改实现了从元结构、关键部件、联接部件、整机多个层次的集成设计分析,并在一台卧式加工中心上进行了应用验证。

关键词: 灵敏度, 模态分析, 固有频率, 模态匹配