Abstract: Based on the single-degree-freedom model of the disc brake, the influence of torque ripple on the creep groan are analyzed. The vibration modes and the stability of equilibrium points are discussed based on Stribeck friction model. The disc brake without torque ripple may exhibit different kinds of vibrations, such as pure slip, stick-slip, stick-slip with conversion. During the stick-slip conversion, the vibration with small amplitude appears. Period excitation can separate the vibration (without excitation) into two parts. Those two parts are converted when the excitation at its maximum or minimum value. The excitation also influences the separatrix which makes the dynamics more complex. The stick-slip motion can also be introduced by changing the frequency of the excitation. The amplitude of the vibration will be gradually increased with the increase of braking pressure. Under the same braking pressure, the amplitude of the vibration with torque ripple is bigger than without. This work can provide references for revealing the influencing factors of the creep groan of the disc brake.

Key words: Nonlinear Vibration, Disc Brake, Torque Ripple, limit cycle, Stick-slip motion

摘要： 基于汽车盘式制动器单自由度模型研究了转矩扰动对其颤振行为的影响。依据Stribeck模型分析了盘式制动器的振动模式和不同模式下的平衡点及稳定性。在未受转矩激励下，制动系统轨线可能穿越Stick，Stick-slip和Slip三个区域，且在一定的制动压力下还会出现极限环振动；在转矩扰动激励下，制动系统的振动同样会穿越三个区域，但由于分界线也受到激励的影响，导致振动行为更加复杂；无论是否受到激励，随着制动压力的增加，制动系统的振幅都将逐渐增加；在相同制动压力下，当制动系统受到转矩激励时，振动幅值大于未受激励情况。研究可为揭示制动器颤振的影响因素提供参考。

关键词: 非线性振动, 制动器, 转矩扰动, 极限环, 粘滑运动