摩擦片偏磨引起的汽车制动低鸣噪声

Vehicle Brake Moan Noise Induced by Brake Pad Taper Wear

建立后盘式制动器有限元模型,对其进行制动低鸣噪声的有限元复特征值分析。根据系统的负阻尼比预测系统出现制动噪声的趋势。利用该模型,研究摩擦片切向偏磨对制动噪声的影响。研究结果表明,切向偏磨是引起制动低鸣噪声的主要原因。当偏磨量大于0.5 mm时,系统的负阻尼比突变,说明发生制动低鸣噪声的可能性极大;同时该噪声的出现与制动压力、摩擦滑动方向、摩擦因数有特定的关系。该计算结果与噪声试验结果完全一致,为消除该制动低鸣噪声提供了理论依据和指导。

A finite element model of disc brake is established. A complex eigenvalue analysis of the brake system is performed. The propensity of brake moan noise is evaluated on the basis of damping ratio of brake system dynamic model. By using the finite element model, effects of the brake pad taper wear on brake moan noise is studied. The results show that the brake pad taper wear is a significant factor for generating the instability causing the brake moan noise. When the brake pad taper wear is greater than 0.5 ram, the value of negative damping ratio rapidly increases, and the propensity of brake moan noise is magnified greatly. While the propensity of brake moan noise has a specific relationship with the brake pressure, friction direction and friction coefficient. The simulation result is the same as test result, which provides the theory and guidance for brake moan noise control.