Study On The Life Prediction Model Of Self-lubricating Spherical Plain Bearings Under The Condition Of Low Speed And Heavy Loading

Self-lubricating spherical plain bearings are widely applied to a variety of domains such as aerospace, traffic and water conservancy facilities because they have many advantages such as compact structure, impact resistance, high safe reliability, and self-lubricating. The life prediction of self-lubricating spherical plain bearings is the basic of the aviation weapon equipment safety and reliability, and it is the key of researching new kind of self-lubricating spherical plain bearings.In this paper, a new improved life prediction model of self-lubricating spherical plain bearings was presented, and this model could be used under the condition of low speed and heavy loading. Scientific and reasonable wear life tests of self-lubricating spherical plain bearings were conducted, and the tests could acquire the data which deduced the life prediction model. The experimental scheme was designed. The experimental materials,sample size, test conditions and test steps were confirmed.Every life factor of the standard self-lubricating spherical plain bearing life formula was analyzed. The experiments were conducted under the condition of low speed and heavy loading by using wear testing machine. The main life factors were load life factor and speed life factor. The wear process of self-lubricating liner was recorded. The wear mechanism was studied by observing the liner surface. The failure mode of the self-lubricating liner affirmed to be wear-out failure.The test data was processed using the improved method of Bootstrap. This method can reduce the impact of the small sample size. The change rule of life factors were found by analyzing the test data of self-lubricating spherical plain bearings.The life formula of self-lubricating spherical plain bearing was presented, and the formula could be used under the condition of low speed and heavy loading. Different kinds of self-lubricating spherical plain bearing tests were done and the life formula was verified with the inspection method of wilcoxon matched pair rank test. The wear life of self-lubricating spherical plain bearings odeyed the weibull distribution, which was determined by the statistical inference.