实验模态综合法若干问题的研究  

Some problems regarding experimental modal synthesis method

作　　者：宋攀[1] 董兴建[1] 孟光[1] 

机构地区：[1]上海交通大学机械系统与振动国家重点实验室,上海200240

出　　处：《振动与冲击》2011年第9期174-177,183,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(10702039);中国博士后科学基金特别资助项目(200801197);973计划(2006CB705400)

摘　　要：提出了子结构可补偿高阶截断模态且易与实验模态相结合的剩余动柔度概念,然后采用自由界面模态综合技术,实现子结构综合。通过部分忽略高阶截断模态的动态效应给出了剩余质量和剩余刚度的近似表达式,简化了子结构的实验建模;基于谐波集中力系的等效原理,提出了一种全新的转角动柔度间接测量方法,在一定程度上解决了实验模态综合中的界面对接信息不足问题。克服了将实验模型和有限元分析模型进行模态综合的技术难题,数值计算和实验验证表明所提方案可行。The residual dynamic flexibility,a new definition of the inertia relief attachment mode was introduced.The free-interface component mode synthesis method based on the residual dynamic flexibility can compensate the influence of high-order truncated modes and it＇s easy for experimental measurements.The approximate representations of residual mass and residual stiffness were deduced by partly ignoring the dynamic effects of the truncated modes.The method can be used to set up the dynamic model of whole structure by coupling experimental model of component A and finite element model of component B.The problem of spatial incompleteness was solved by estimating the rotation mode shapes using a numerical differentiation method.Numerical examples demonstrate the validity and efficiency of the proposed method.

关 键 词：实验模态综合 剩余动柔度 剩余质量 转角模态间接测量 自由界面 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3