含概率盒变量的动力总成悬置系统可靠性分析  

Analysis on reliability of powertrain mounting systems with probability-box variables

作　　者：郑正中 侯亮 赖辉平 卜祥建 ZHENG Zheng-zhong;HOU Liang;LAI Hui-ping;BU Xiang-jian(School of Aerospace Engineering,Xiamen University,Xiamen 361100)

机构地区：[1]厦门大学航空航天学院,福建厦门361100

出　　处：《机械设计》2022年第2期1-6,共6页Journal of Machine Design

基　　金：国家自然科学基金面上项目(51975495);中央引导地方专项(2020L3002);厦门市重大科技项目(3502Z20191019)。

摘　　要：动力总成悬置系统(Powertrain Mounting System,PMS)的可靠性分析存在不确定参数建模不准确和计算效率低下的问题。因此,文中将概率盒(probability box,p-box)引入到PMS不确定性分析中,并提出基于拒绝采样原理的PMS混合不确定性分析方法。首先,为了获得固有特性计算方程,建立PMS的12自由度模型;然后,分析随机变量和参数化p-box变量的特点,实现两种变量的统一表达;再次,提出一种基于双层蒙特卡罗抽样法和基于拒绝采样原理的混合不确定性分析方法,实现PMS固有特性响应的不确定性分析;最后,通过实际案例验证了所提方法的有效性和高效性。The analysis on reliability of powertrain mounting systems(PMS) has the problems of inaccurate parameter modeling and low calculation efficiency.Therefore,in this article the probability box(p-box) is introduced to the analysis on uncertainty of PMS,and a mixed analytical method for PMS uncertainty according to the principle of rejection sampling is proposed.Firstly,in order to obtain the inherent characteristic calculation equations,a 12 degree of freedom model of PMS is set up.Then,the characteristics of random variables and parameterized p-box variables are explored,in order to realize the unified expression of the two variables.Thirdly,a mixed analytical method based on the double-layer Monte Carlo sampling method and the rejection-sampling principle is worked out,so as to achieve the analysis on uncertainty of the PMS inherent characteristic response.Finally,some practical cases have verified that this method is efficient and effective.

关 键 词：客动力总成悬置系统 可靠性分析 概率盒变量 拒绝采样 

分 类 号：U464[机械工程—车辆工程]