Research On Dynamic And Wear Reliability Of Automobile Parts

The research of the reliability of the parts of automobile isn't as same as the electronic reliability which analyzes the reliability of the products by a large number of experiments,so it is more practical to study the reliability of the automobile parts it through the theory.The research of the reliability of the automobile parts mainly developed from the mechanical reliability.In the early research,the reliability research it was the static reliability research,which could only reflect its early reliability.In recent years,the research of the dynamic reliability made large progress,which model met the actual requirements better.In this paper,the research on the dislocation probability of the valve mechanism,the strength and wear of dynamic reliability of the automobile parts are made.Specific content is as follows:Chapter 1 Based on the background of reliability research,the status of the development of reliability theory is discussed,and the research contents are briefly introduced.Chapter 2 This paper introduces various methods and mathematical theories which are frequently used in the reliability study,and focuses on the specific methods of dynamic reliability and dynamic wear reliability.It is used to analyze the off-line probability,dynamic reliability and wear dynamic Reliability provides a theoretical basis.Chapter 3 The force analyzing of the valve train of the internal combustion engine is carried out,and the valve train is simplified as a single-degree-of-freedom model with damping,and the disconnection probability's mathematical model of reliability of the valve train is obtained by random perturbation and probabilistic reliability analyzing method.It is found that the basic stochastic variables of the valve train obey the normal distribution.Besides,the disconnection probability of the valve train in the cam acceleration section,uniform speed section and working section is calculated.And the disconnection probability is also calculated at different rotation speed.The paper puts forward to some improvement measures to reduce the disconnection of valve train.It provides some theoretical help for the research of the reliability of the valve train.Chapter 4 The reliability state equation with time is established by using the theories of strength degradation,order statistics and stochastic load history.The dynamic reliability and failure rate of the front axle,connecting rod and rear axle of the vehicle are calculated and simulated by Monte Carlo.Studies have shown that the reliability of auto parts decreases with time,but the failure rate would increase gradually.Chapter 5 Wear is one of the main failure modes of automotive components.The reliability of automotive components in the wear position has been studied,finding that when the wear depth exceeds the maximum.wear depth is allowed to fail.The second-order moment and random perturbation method are used to obtain the dynamic reliability of wear.The wear of the front pin of the front axle and the connecting rod is calculated and simulated by Monte Carlo,and the dynamic reliability of wear is reduced by time.And the dynamic reliability of the wear at the same time is multiplied by the dynamic reliability.The dynamic reliability of the front axle and the connecting rod is obtained,which provides a theoretical basis for the study of the wear strength reliability of automobile parts.Chapter 6 The research results of this paper are further summarized and its shortcomings are analyzed,which pointing out the direction for the future research.By studying the strength and wear reliability of automobile front axle and connecting rod,it provides a way for analyzing and improving the reliability of automobile parts in the future.