基于复特征值分析的某盘式制动器制动尖叫问题改进

Improvement of brake squeal of a disc brake based on complex eigenvalue analysis

以某车型出现2000 Hz制动尖叫问题的盘式制动器为研究对象,建立制动器的有限元模型。通过试验模态对有限元模型进行修正,应用复特征值分析技术,获取系统的复特征值和振型,并通过ODS测试确认与制动尖叫频率对应的不稳定模态。然后针对此不稳定模态,通过相关性分析量化制动器零件对系统不稳定模态的贡献,采用优化具有最大贡献量的零件几何结构来改善制动尖叫。最后通过SAE J2521台架试验验证此方法可行。

Here,the problem of disc brake of a certain type car with 2000 Hz brake squeal was taken as the research object.The finite element model of the brake system was established.This model was modified with the experimental modal analysis.Firstly,complex eigenvalues and vibration modal shapes of the system were obtained by using the complex eigenvalue analysis technique.The unstable mode corresponding to brake squeal frequency was determined with ODS testing.Then,aiming at this unstable mode,contributions of brake parts to it were quantified with correlation analysis,and the brake squeal was improved by optimizing the geometric structure of the part with the maximum contribution.Finally,the feasibility of the proposed method was verified through SAE J2521 bench tests.