Abstract: Based on the complex eigenvalue method, the finite element simulation model for the brake noise analysis of an automobile disc brake is established in this paper. The brake noise is analyzed from the simulation results of frequency, modal shape, negative damping ratio, modal participation coefficient and modal strain energy, which provides a theoretical basis for noise, vibration and harshness (NVH) development of automobile disc brake system. The results show that the possibility of braking noise of the automobile disc brake system is the greatest near 8 337 Hz. At 8 337 Hz, the real part of the complex eigenvalue is the maximum of 45.5, the negative damping ratio is the minimum of –0.545 6%, the participation coefficient in Z direction is the maximum, the strain energy ratio of the brake disc and the brake pad is large, and the unstable mode is mainly caused by the modal coupling between the brake disc and the brake pad.

Key words: Disc brake; Brake noise; Complex eigenvalue analysis; Finite element analysis

摘要： 论文主要基于复特征值法，建立了某汽车盘式制动器制动噪声分析的有限元仿真模型， 包括从频率、振型、负阻尼比、模态参与系数、模态应变能等仿真结果进行制动器制动噪声 分析，为汽车盘式制动器系统的噪声、振动与声振粗糙度（NVH）开发提供理论依据。结果 表明，该汽车盘式制动器系统在 8 337 Hz 频率附近发生制动噪声的可能性最大，在 8 337 Hz 时复特征值实部为最大值 45.5，负阻尼比为最小值–0.545 6%，Z 方向的参与系数值最大，制 动盘和制动块的应变能比值较大，且该不稳定模态主要是由于制动盘和制动块之间发生模态 耦合引起的。

关键词: 盘式制动器；制动噪声；复特征值分析；有限元分析