不确定性因素对某橡胶隔振器连接刚度的影响  

Investigation on Uncertain Factors Affecting the Joint Stiffness of Some Rubber Isolator

作　　者：陈学前[1] 沈展鹏[1] 刘信恩[1] 王玉军[1] 

机构地区：[1]中国工程物理研究院总体工程研究所,绵阳621999

出　　处：《振动．测试与诊断》2015年第3期530-534,594-595,共5页Journal of Vibration,Measurement & Diagnosis

基　　金：中国工程物理研究院重点基金资助项目(2011A0203010;2013A0203007)

摘　　要：设计了两类可以分离某橡胶隔振系统不确定性源的模态试验,并对每类试验进行了重复试验。根据试验结果,基于传统有限元模型修正方法对隔振系统的连接刚度进行了识别。基于贝叶斯方法并结合马尔可夫链蒙特卡罗(Markov chain Monte Carlo,简称MCMC)抽样研究得到了连接刚度的概率密度,并结合随机变量的运算量化了各不确定性源对隔振器连接刚度的影响,最后通过确认试验验证了连接刚度不确定性模型的有效性。研究结果表明,隔振系统装配不确定性对连接刚度的影响比隔振器橡胶材料分散性的影响低一个数量级。Two types of modal tests are designed to separate the uncertain resources in some rubber isolation systems.Repeated multi-test cases are conducted in each type of test.According to the test results,the joint stiffness of the isolation system is identified based on the traditional finite element(FE)model updating.The probability density functions of the joint stiffness are established by combining the Bayesian method with the Markov chain Monte Carlo(MCMC).Moreover,the effect of the uncertain resources on joint stiffness is quantified by the operation of random variables.Lastly,the uncertain model of the joint stiffness is validated with other validation tests.Results show that the effect of the assembling uncertainty on joint stiffness is only one tenth of that of the rubber material dispersion.

关 键 词：橡胶隔振器 不确定性源 贝叶斯方法 不确定性量化 

分 类 号：TP306[自动化与计算机技术—计算机系统结构]