简谐激励下制动器尖叫噪声的因素分析

Influence Factors Analysis of Brake Screaming Noise under Simple Harmonic Excitation

为减小盘式制动器工作过程中产生的高频尖叫噪声,根据制动器工作原理建立动力学模型和三维实体模型,考虑到接触表面作用力的复杂性,针对接触表面的不平顺特性用谐波激励进行模拟,采用谐响应分析理论研究阻尼、相位差和正压力因素对尖叫噪声的影响。分析表明,增大系统阻尼既降低共振幅值又减小系统共振频率;适当控制谐波载荷的相位差能有效减小尖叫噪声;正压力的大小影响尖叫噪声的响度但与尖叫频率无关。从简谐激励角度对于尖叫噪声影响因素的研究对于改善制动系统工作状态,优化汽车的NVH特性具有一定理论和实践意义。

To reduce the high frequency scream noise generated in the working process of the disc brake, the dynamics model and three-dimensional entity model of the brake were established according to its working principle. Considering the force complexity in the contact surface, the harmonic response analysis theory was applied to analyze the influence of the system damping, phase difference and positive pressure on the scream noise. The analysis result shows that increasing the system damping can reduce the resonant amplitude and the resonant frequency of the system. Appropriate control of the phase difference of the harmonic load can effectively reduce the screaming noise. The level of the positive pressure can affect the scream noise loudness but it has nothing to do with the frequency of the screaming. From the perspective of harmonic excitation, the study of screaming noise factors has some theoretical and practical significance for improvement of the braking system working conditions and optimization of the NVH performance of vehicles.