Stochastic modelling and updating of a joint contact interface
Stochastic modelling and updating of a joint contact interface
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DOI：
10.1016/j.ymssp.2019.04.003
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发表时间：
2019-08
影响因子：
8.4
通讯作者：
H. Jalali;H. H. Khodaparast-H.;H. Madinei;M. Friswell
中科院分区：
文献类型：
--
作者：
H. Jalali;H. H. Khodaparast-H.;H. Madinei;M. Friswell
接头和机械连接中接触界面的动力特性对装配结构的整体动力特性有很大影响。不确定性和非线性是接触界面的两大影响，这给精确建模带来了挑战。表面粗糙度、表面光洁度和接触预紧力的随机性是接触界面变化的主要来源。另一方面，滑移和拍打是导致节点非线性行为的两种机制。需要为这种不确定结构建立随机线性/非线性模型，用于动态响应分析或系统参数识别。本文利用实验结果研究了包含螺栓搭接的组合结构的线性行为变化。采用随机通用节点模型对结构进行随机建模，并利用贝叶斯辨识方法对节点模型参数的不确定性进行辨识。
Dynamic properties of the contact interfaces in joints and mechanical connections have a great influence on the overall dynamic properties of assembled structures. Uncertainty and nonlinearity are two major effects of contact interfaces which introduce challenges in accurate modeling. Randomness in surface roughness quality, surface finish and contact preload are the main sources of variability in the contact interfaces. On the other side, slip and slap are two mechanisms responsible for nonlinear behavior of joints. Stochastic linear/nonlinear models need to be developed for such uncertain structures to be used in dynamic response analysis or system parameter identification. In this paper, variability in linear behavior of an assembled structure containing a bolted lap-joint is investigated by using experimental results. A stochastic model is then constructed for the structure by employing a stochastic generic joint model and the uncertainty in the joint model parameters is identified by using a Bayesian identification approach.