Reliability Analysis Of Wear Performance And Residual Life Prediction Of Microstructure Unfolding Wheel

The unfolding wheel is the most core part of the wheel bearing steel ball testing equipment.Because the whole surface of the steel ball is unfolded by friction,it is very easy to wear and fail in the use process.With the development of biomimetic tribology,a new idea is provided to improve the friction and wear resistance of the unfolding wheel,that is,to add microstructure on the surface of the unfolding wheel.In this paper,the microstructure unfolding wheel is taken as the research object,aiming at the problems of less research on the wear performance reliability of the microstructure unfolding wheel,large error in the life prediction method,and the need for a large number of experimental data,which realizes the wear performance reliability analysis and the remaining life prediction under the condition of lack of information data.Firstly,through theoretical analysis,the contact relationship between the steel ball and the unfolding wheel is point contact,and the main wear form is adhesive wear.Based on Holm Archard equation,the wear model between the steel ball and the driving surface of the unfolding wheel is established,and the optimal microstructure of the driving surface of the unfolding wheel is determined to be diamond by simulation analysis.According to the characteristics of diamond microstructure morphology,a new concept of wear performance reliability of the unfolding wheel with microstructure is proposed,and the wear performance reliability of the unfolding wheel is graded to provide theoretical basis for the next research.Secondly,we use the self-service resampling method to expand the data sample.Based on the principle of maximum entropy,the probability density function model of the sample data is constructed,and the confidence interval of the random variable of the reliability of the wear performance of the unfolding wheel is obtained according to the principle of small probability event.Then,the frequency of thesample data of the wear performance of the unfolding wheel falling outside the confidence interval is calculated by using the Poisson process,and the relative reliability of the wear performance of the unfolding wheel in the future is obtained.The wear performance reliability of the unfolding wheel is analyzed.Finally,based on the grey system theory,the remaining life of the unfolding wheel is predicted,and the weakening buffer operator is introduced to process the data,and three weakening buffer operators are constructed.The monotonous increasing time data series are obtained by accumulation.Based on this,the whitened differential equation of the GM(1,1)model of the grey system is established,and the accuracy of the model is analyzed with the 12 th group of experimental data.The relative error of the model is small,and then the residual life of the wheel can be predicted under the lack of information.In this paper,the whole life of the unfolding wheel is demarcated again.Under the condition lack of information and small sample data,the reliability analysis of the wear performance and the prediction of the remaining life of the unfolding wheel are completed,which provides a scientific reference for the research of the whole life of the unfolding wheel.