旋转滑动摩擦高频噪声产生机理的实验研究

为了深入研究金属旋转滑动摩擦高频噪声的产生机理，以多功能摩擦磨损试验机为平台，采用单因素实验法来研究相对滑动速度、接触压力、表面形貌等影响因素对摩擦高频噪声的影响规律。实验发现：金属旋转滑动高频摩擦噪声多发生在相对滑动速度低、接触压力较大以及摩擦因数-速度负斜率处；摩擦副间相对滑动速度、接触压力和表面粗糙度的变化几乎不会对高频噪声的频率产生影响，但高频噪声声压级随表面粗糙度的增大呈现明显减小趋势。对摩擦噪声声压信号和法向、切向振动加速度信号进行互相关分析，结果表明，法向振动加速度信号和摩擦噪声声压信号之间具有更高的相关性，从而为进一步理解摩擦高频噪声的产生机理和预测模型的建立提供了参考。

Experimental Investigation into Friction-induced Squeal of Rotating-sliding Friction

For further studies of the formation mechanism of friction-induced squeal from a rotating-sliding friction system, a multifunctional friction testing machine was utilized to investigate the effects of sliding speeds, contact pressures and surface topographies on the squeal, by applying the single-factor experimental method. The experiments find that the friction-induced squeal occursed mostly at the conditions of a relatively low sliding speed, a large contact pressure and a negative coefficient- velocity slope. The relative sliding velocity, contact pressure and surface roughness might not affect the frequency of squeal, but the squeal intensity shows a significant downward trend with the increases of surface roughness. The cross-correlation analysis demonstrates a better correlation between the normal vibration acceleration signals and the squeal signals, which provides a reference for the further understanding of the formation mechanism and prediction model of friction-induced squeal.