摘要
针对不确定性参数汽车制动器噪声的抑制问题,基于随机参数分析理论,将响应面法与有限元复特征值技术相结合,提出了一种随机参数汽车制动器系统稳定性的分析方法。该方法用随机参数对制动器系统的不确定性进行描述,系统的摩擦系数、制动压力、制动盘厚度、制动片厚度和支撑背板的厚度参数分别采用随机变量表示;为提高分析效率,建立了包含随机变量的制动器不稳定特征值的响应面近似模型,进而根据系统特征值的随机特性对系统稳定性进行分析。用该方法对某车的浮钳盘式制动器系统进行研究,采用蒙特卡洛方法分析了随机参数正态分布假设下系统特征值的概率统计特性和参数灵敏度。结果表明:通过修改制动器支撑背板的厚度以提高支撑刚度,可有效改善制动器系统的稳定性,减小制动噪声的产生。
To suppress the brake noises of an automotive disc brake system with uncertain parameters,a stability analysis method of automotive brake systems is presented in this paper.The essential idea of this method is to combine the RSM（Response Surface Method）and complex eigenvalue analysis techniques with random parameters introduced to describe such uncertainties in the brake system as friction coefficients,brake pressure,disc thickness,pad thickness and backplate thickness.In order to improve the analysis efficiency,RSM is used to build up the approximation models to express the functional relationships between the unstable eigenvalues and the system parameters,which makes it available to study the stability of the brake system according to the random characteristics of the unstable eigenvalues.The stability analysis of a float caliper disc brake system is carried out by the proposed method with the random parameters assumed to follow normal distributions.The statistical characteristics and the sensitivities of unstable eigenvalue are calculated by Monte Carlo method.The results show that increasing the thickness of the backplate can improve the stability and reduce the brake noises of the brake system effectively.
出处
《振动工程学报》
EI
CSCD
北大核心
2014年第5期647-653,共7页
Journal of Vibration Engineering
基金
湖南省研究生科研创新资助项目(CX2013B143)
湖南省长沙市科技计划重大专项资助项目(K1204005-11-1
K1306007-11-1)
湖南大学汽车车身先进设计制造国家重点实验室自主课题(71375004)
关键词
稳定性
汽车盘式制动器
随机参数
不确定性
灵敏度分析
stability
automotive disc brake
random parameters
uncertainties
sensitivity analysis
