动力总成悬置系统频率和解耦率的稳健优化方法  

Robustness optimization method for frequency and decoupling ratio of powertrain mounting systems

作　　者：吴杰[1,2] 周胜男[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广州510641 [2]广东省汽车工程重点实验室,广州510641

出　　处：《振动与冲击》2012年第4期1-7,共7页Journal of Vibration and Shock

基　　金：高等学校博士学科点专项科研基金(新教师基金课题)(200805611087);华南理工大学中央高校基本科研业务费专项资金资助(x2jqD210475w);广东省自然科学基金博士启动基金(07300851)

摘　　要：由于测量误差、安装误差及老化等原因,动力总成悬置的刚度存在一定程度的误差或波动,从而悬置系统的频率和解耦率必然有一定程度的不确定性。考虑到通常容易得到悬置刚度的变化范围,在不需了解其统计特性的情况下,采用区间数描述悬置刚度、悬置系统的频率及解耦率的不确定性。给出了计算悬置系统频率和解耦率变化范围的改进区间截断方法,并验证了其计算精度。为提高悬置系统频率和解耦率的稳健性,提出一种区间型稳健优化方法(简称区间优化)对悬置刚度进行稳健设计。对某轿车悬置系统的频率和解耦率进行了稳健优化,结果表明,对于该悬置系统,稳健优化方法可以较大幅度地提高悬置系统侧倾和俯仰方向频率的稳健性,避免了悬置系统与其它零部件产生共振。与确定性优化相比,悬置系统在垂直方向和绕发动机曲轴扭转方向解耦率稍有降低,但能够满足悬置系统解耦布置的要求。Due to measurement inaccuracy,installation errors and aging,the mount stiffness of a powertrain mounting system（PMS） is usually not deterministic,thus the frequencies and decoupling ratios of a PMS are also somewhat uncertain.Interval numbers were used to describe the uncertainties of the mount stiffness as well as the frequencies and decoupling ratios of a PMS in consideration of being easy to obtain the variation ranges of the mount stiffness without knowing the probability distribution of the stiffness.An improved interval truncation method for obtaining the variation ranges of frequencies and decoupling ratios was presented and its computational accuracy was verified.To improve the design robustness of frequencies and decoupling ratios,an interval optimization method was presented.The presented optimization method was applied to a PMS for maximizing decoupling ratios with frequency constraints.Optimization results show that the interval optimization can significantly increase the robustness of frequencies in roll and pitch directions.In contrast to the deterministic optimization,though the decoupling ratios in vertical and pitch directions decrease slightly,the interval optimization result can meet the decoupling layout requirement.

关 键 词：动力总成悬置系统 区间分析 解耦率 稳健优化 

分 类 号：TK406[动力工程及工程热物理—动力机械及工程]