考虑区间弹性连接的结构动力学特性研究  

Research on Dynamic Properties of a Structure Considering Interval Elastic Connection

作　　者：陈亦文 张锦光[2] CHEN Yi-wen;ZHANG Jin-guang(Logistics Support Department of Wuhan University,Wuhan 430070,China;School of Mechanical and Electrical Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉大学后勤保障部,武汉430070 [2]武汉理工大学机电工程学院,武汉430070

出　　处：《火力与指挥控制》2021年第5期22-28,共7页Fire Control & Command Control

基　　金：国家自然科学基金面上资助项目(51879209)。

摘　　要：基于动态子结构方法,将结构中的弹性连接单独划分成一个独立子结构,并利用零质量空间梁单元对其进行等效,分别基于频域子结构方法(FRF-based Substructuring Method)和模态综合法(Component Mode Synthesis)对考虑弹性连接的结构固有频率和频响函数进行了推导。基于此,将空间梁单元的弹性模量和比例阻尼系数设成区间参数以模拟弹性连接的区间不确定性,基于区间因子法(Interval Factor Method,IFM)分别给出了考虑区间弹性连接结构固有频率和频响函数的区间上下限,从而形成了两种计算分析方法,即CMS-IFM和FBSM-IFM。通过仿真将两种方法与Monte-Carlo模拟方法的计算结果进行了对比,结果表明:CMS-IFM和FBSM-IFM正确高效。Based on dynamic substructure method,the elastic connection in complex structure is divided into an independent substructure,zero-mass spatial beam element is used to make equivalence.Then the natural frequency and frequency response function of the structures considering the elastic connection are derived based on Component Mode Synthesis(CMS)and FRF-based Substructuring Method(FBSM),respectively.In addition,the elastic modulus and proportional damping coefficients of spatial beam elements are set to interval parameters to simulate the uncertainty of elastically the connected interval,the interval upper and lower limits of the natural frequency and FRF considering the interval elastic connection struiture are obtained respectively on the basis of Interval Factor Method(IFM).Consequently,the two calculation and analysis methods,namely CMS-IFM and FBSM-IFM are thus formed.Last but not least,the performance of the two proposed methods is validated by comparision with Monte-Carlo simulation method through numerical simulation.All the results indicate that,both CMS-IFM and FBSM-IFM methods are correct and efficient.

关 键 词：区间弹性连接 空间梁单元 模态综合法 频域子结构方法 区间因子法 

分 类 号：U266[机械工程—车辆工程]