In automotive industry, friction-induced noise and vibrations have been a critical cost factor because of customer dissatisfaction. Even though several decades efforts were made, friction-induced noise and vibrations still remains surprisingly unpredictable and poorly understood. There are many unique dynamic phenomena and underlying mechanisms associated with friction-induced noise and vibrations. The most prominent ones could be listed as follows: stick-slip due to difference between static and dynamic frictions; self excited vibrations due to velocity-dependent friction; modal couplings; non-smoothness effects; transient contact separation or vibro-impact effects; random excitation; impulsive excitation, sprag-slip; complex vibrations due to complicated friction laws such as rate-dependent friction; parametric vibrations of system with variable normal force and friction; instability due to gyro-effects; vibrations due to nonlinear properties such as nonlinear contact stiffness; time-varying effects due to radical interface change such material generation and removal; uncertainty such as interface wear; combinations and interaction of varied mechanisms. In general sense, friction-induced noise and vibrations have time-varying, nonlinear stochastic features.[Chen G (2013) Friction-Induced Noise and Vibrations: Diagnosis and Prognosis]
Last date updated on April, 2024
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