接触表面不平度对摩擦尖叫噪声的影响

针对摩擦尖叫的间歇性特点,建立了考虑摩擦接触表面不平度的3自由度摩擦自激振动机理模型.应用数值方法分析了接触表面不平度倾角对系统稳定性及瞬态动力学特性的影响,并进行了基于销-盘装置的摩擦尖叫噪声试验研究.结果表明:系统的稳定性主要取决于系统自身的耦合特性,但也与摩擦特性和接触表面不平度倾角的综合作用有关.当接触表面不平度倾角增大时,系统趋向不稳定,会激发尖叫噪声.

Effects of Surface Roughness on the Friction-induced Squeal Noise

To investigate the intermittent characteristics of friction-induced squeal, a 3-degree-of-freedom (DOF) model of self-excited vibration was established taking into account the frictional surface roughness. The effects of incline angle of surface roughness on the system stability and transient response were analyzed by using numerical computation. A test rig of pin-on-disc was developed to verify the proposed theoretical results. The numerical and experimental results showed that the system stability was mainly dependent on the modal coupling effect of system itself, and was affected by the friction coefficient and the surface roughness as well. The system was prone to instability and producing squeal noise when the incline angle of surface roughness increased to some value.