Research On Acceleration Test Method Of Self-Lubricating Spherical Plain Bearing On High Frequency Light Load

High-frequency light-load self-lubricating articulated bearings are mainly used in aviation aircraft systems,and its main characteristics are self-centering,selflubricating,and working under high-frequency light load conditions.Due to the harsh working conditions,once a failure occurs,it will have an impact on the helicopter system and threaten the life safety of the pilot.Therefore,the prediction of the life of the joint bearing is of great significance to the design,maintenance,life and other aspects of the current stage.It is necessary to study a self-lubricating joint bearing suitable for high-frequency and light-load conditions,and accurately predict its life to achieve the conditions of use.The main failure mode of self-lubricating joint bearings is that after the self-lubricating material has reached a certain amount of wear,the gap between the inner ring and the outer ring will increase and cannot be used normally.However,under normal operating conditions,the wear of articulated bearings is very slow,making life prediction difficult.Accelerated testing can shorten the test time and predict the life of the product in advance.Combining the life prediction of the joint bearing with the acceleration test can accurately predict the life of the high-frequency light-load self-lubricating joint bearing and guide the improvement of the joint bearing.This article starts with self-lubricating materials for self-lubricating joint bearings,analyzes the failure modes of self-lubricating materials in depth,and improves the existing life model of joint bearings to obtain a self-lubricating joint suitable for highfrequency light-load conditions Bearing life model.Combined with the accelerated test theory and method,a set of high-frequency light-load self-lubricating joint bearing accelerated life test method is obtained to predict the life and reliability of the joint bearing.This paper analyzes the range of values ??of various impact factors in the existing standard articulated bearing life formula under high-frequency light-load conditions.For high-efficiency coefficients of self-lubricating spherical bearing life,high-frequency light-load self-lubricating spherical bearing accelerated test The life test of the self-lubricating joint bearing is carried out under the condition of high frequency and light load.The wear and tear process of the self-lubricating pad is recorded.By observing the characteristics of the self-lubricating pad material,the wear mechanism is studied to determine the correct value of the life coefficient.Based on the wear life of high-speed light-load self-lubricating joint bearings,a complete life model was established.Based on the basic theory of accelerated life test,the acceleration test,acceleration factor and acceleration scheme were selected,and the high-frequency light-load self-lubricating joint bearing acceleration test program was developed.At the same time,the analysis method of Weibull distribution data under the test scheme is proposed to improve the accuracy of the parameters,so as to reasonably estimate the life of the product,and predict the reliability of the life,and propose a set of high-speed light-load self-lubricating joint bearings The accelerated life test method can be used to guide the design and implementation of high-speed light-load self-lubricating joint bearing life test in actual engineering.