可变外激励下制动器低频振动的实验与数值仿真

Experimental and Numerical Study on Low-frequency Vibration of Brakes with Variable External Excitation

在实验和数值仿真的基础上,利用三自由度模型来预测制动系统的动力响应,即可变外激励下的制动器低频振动。实验中制动器参数可调,外激励可变。采用事件驱动法对制动器低频振动进行数值仿真,实验和数值仿真中均可测得制动器低频振动,证明数值模拟结果可靠。通过实验与数值仿真观测制动系统参数变化以及外激励对其低频振动的影响,发现制动系统低频振动对其自身参数改变十分敏感;同时,选取适当形式的外激励可以抑制制动器的低频振动。

The low-frequency vibration of brakes under variable external excitation is studied experimentally and numerically. In the experiment, the mechanical parameters are changeable and the external excitation is variable, which is realized by using an external exciter with a waveform generator. The low-frequency data of the brake system is obtained.Then, a 3-DOF model is established to predict the dynamic behavior of the brake system. The numerical simulation is carried out using the event-driven method. The results of low-frequency vibration are compared with those of the experiment and the correctness and reliability of the numerical simulation are verified. The influence of the mechanical parameters and the external excitation on the low-frequency vibration is analyzed. It is shown that the low-frequency vibration of the brake system is sensitive to the variation of the mechanical parameters, and the pertinent selection of the external excitation can effectively suppress the low-frequency vibration of the brake system.