Nonlinear vibration and transient stress analysis of disc brake based on computer simulation technology

The nonlinear vibration and dynamic stress characteristics of disc brakes are key factors affecting braking noise and safety. Based on the working principle of disc brake, a six-degree-of-freedom dynamic model was constructed, and the amplitude-frequency response of vibration under diverse braking pressures and initial velocities was acquired. The modal characteristics of the brake disc were computed using the finite element simulation approach, and the natural frequency and vibration mode were obtained. The accuracy of the modal calculation was verified by means of the laser detection method. In order to study the dynamic stress variation law more accurately, a coupled model of temperature and displacement was established, and transient stresses on different paths were obtained. The results indicate that the finite element model has high accuracy, with a maximum calculation error of only 5.1 % for the natural frequency. Besides, temperature variations will lead to thermal deformation of the brake disc, which intensifies the random vibration characteristics associated with the friction process.