中介轴承多点故障动力学建模和仿真分析

针对中介轴承故障理论尚不完善这个缺点,特别是中介轴承多点故障机理认识不清,基于非线性Hertz接触理论,采用时变位移激励函数对中介轴承内、外圈同时存在的故障进行描述,建立中介轴承多点故障4自由度动力学模型.搭建中介轴承故障实验台,对中介轴承多点故障进行试验模拟,通过对比试验数据与动力学数值仿真结果发现,故障特征频率仿真...

Dynamic Modeling and Simulation Analysis of Inter-Shaft Bearing with Multi-Point Faults

At present the theory of inter-shaft bearing fault is not perfect, especially the mechanism of multi-point faults of inter -shaft bearing is unclear. Based on the nonlinear Hertz contact theory, the time-varying displacement excitation function is used to describe the simultaneous faults in the inner and outer rings of the inter-shaft bearing, and a 4-DOF dynamic model of the inter-shaft bearing multi-point faults is established. An inter-shaft bearing fault test bench is built to simulate the multi-point faults of the inter-shaft bearing. By comparing the experimental data with the dynamic numerical simulation results, it is found that the error between the simulation results and the experimental results of fault characteristic frequency is less than 1%, which verifies the validity of the dynamic model. Based on the model, the influence of defect width, radial load and speed ratio on characteristic parameters of typical faults is analyzed. The results show that with the increase of defect width, radial load and speed ratio, both the peak value and the root mean square value tend to increase, but the kurtosis factor changes in a complicated way. When the bearing is in fault mode, the kurtosis factor is always larger than 3, while the waveform factor is not sensitive to the fault.