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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.
According to the intermittent characteristics of the frictional screaming, a 3-DOF frictional self-excited vibrational mechanism model considering the surface roughness of the frictional contact was established. The numerical method was used to analyze the influence of the contact surface roughness on the system stability and transient dynamic characteristics , And the friction-screaming noise test based on pin-plate device was carried out. The results show that the stability of the system depends mainly on the coupling characteristics of the system, but also on the combination of frictional characteristics and contact surface roughness. When the contact surface roughness increases, the system tends to be unstable and will cause screaming noise.