某车型盘式制动器尖叫噪声分析及改进

Brake-squeal Noise Analysis and Improvement of a Certain Vehicle

文章针对某车型在后盘式制动器的尖叫噪声问题,在Abaqus中建立汽车低速状态制动的有限元模型进行复模态分析,得到与测试接近、特征根实部为正值的不稳定模态。在此基础上探究不稳定模态的影响因素来指导改进工作。结果表明:系统摩擦系数、摩擦块的弹性模量、制动盘刚度对制动尖叫噪声有重要影响,改进后结构无不稳定模态,经实车验证无尖叫噪声出现。

This paper studied on brake-squeal Noise of a certain vehicle’s rear brake system. The finite element model of this system was established, and the complex eigenvalue was carried out by Abaqus software. A unstable dynamic response with positive value of eigenvlue’s real part that was calculated by simulation. It’s frequency was consistent with test results. On this basis, the influencing factors of unstable frequency were researched that could be use to improve this brake-squeal issue. The results showed that system friction coefficient, brake pad’s elastic modulus, and brake disc’s stiffness have important influence on brake-squeal noise. And there was no positive value of real part in improved brake system, which shows that the optimization analysis was effective.