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测量分析动态摩擦接触力是研究摩擦振动与噪声发生机理的关键.本文中建立了盘-销系统摩擦尖叫试验台架,成功再现了摩擦尖叫.采用三向力传感器对有无摩擦尖叫条件下的动态摩擦接触力进行了测量,并利用小波信号分解、概率密度函数、功率谱密度函数、时频分析等方法进行了分析和讨论.研究发现:在发生摩擦尖叫时,动态摩擦力和法向力发生高频波动,是系统噪声的激励源;无摩擦尖叫时的摩擦力和法向力的动态分量为典型的白噪声随机过程,呈非高斯分布;有摩擦尖叫时的摩擦力和法向力为窄带高频类谐波信号,摩擦力呈非高斯分布,而法向力近似为高斯分布;模态耦合是导致盘-销系统发生动态接触力高频波动以及摩擦尖叫的原因.
Measurement and analysis of dynamic frictional contact force is the key to study the mechanism of frictional vibration and noise.In this paper, a friction-screaming test stand of the disk-pin system was established and the screaming of friction was successfully reproduced.With a three-way force sensor, Dynamic frictional contact force was measured and analyzed by wavelet decomposition, probability density function, power spectral density function, time-frequency analysis and other methods.The study found that: in the event of a frictional scream, the dynamic friction And the normal force generated high frequency fluctuations, is the source of system noise excitation; frictionless frictionless and non-frictional dynamic component of the normal force is a typical white noise stochastic process, non-Gaussian distribution; friction screaming Friction and normal force are narrow-band and high-frequency harmonic signals, the frictional force is non-Gaussian distribution, and the normal force is approximately Gaussian distribution. The modal coupling leads to the high frequency fluctuation of dynamic contact force and the frictional tip The reason for calling.