The influence of test bench support on the recognition accuracy of dynamic characteristic coefficient of sliding bearings

There are many factors affecting the test accuracy of the dynamic characteristics of sliding bearings, among which the test bed parameters are very important and need to be considered. In this paper, the inverted dynamic characteristic test bench is taken as the research object. The influence of supporting parameters on the test accuracy of sliding bearing dynamic characteristic is analyzed. Based on the positive and negative problems of dynamics, the testing process of sliding bearing dynamic characteristics is simulated by simulation method, and the evaluation method of dynamic characteristics identification accuracy is proposed. Considering the different excitation frequency, the influence law of support stiffness and support damping of the test bench on the identification accuracy of the main stiffness and main damping of bearing is studied. The reasonable excitation frequency and support parameter range are determined according to the analysis results. The results show that the vibration frequency of the inverted bearing dynamic characteristic test bed is recommended to be between 30~280 Hz. The bearing stiffness should be greater than the stiffness of the bearing under test. The greater the bearing stiffness, the better the bearing dynamic characteristic identification accuracy. The value of support damping almost does not affect the recognition accuracy.