The Maintenance Decision Method Research Of Automobile Transmissions

With the development of economic globalization,science and technology,and industrial equipment becoming precise treatment,complexity,and high-performance, the manufacturing enterprises are in order to improve their manufacturing ability and satisfy customers' requirements in the global market,so they must improve the product quality,raise the service and maintenance level.And as followed,the enterprises must spend a lot of human resources and maintenance resources.From this point,this article has been done the following studies:First,through the theory of FMEA analysis and discussion,find a method to apply FMEA to automobile transmission maintenance decision-making.Through the analysis of CAS5-20A transmission,list the failure mode and effect analysis,possible failure modes of the transmission parts,and determine the fault level.Then quantify the failure mode by density of infection calculation.Users can see the density of infection of every failure mode clearly,and then can maintain the transmission properly.Second,through the theory of FTA analysis and discussion,construct the fault tree of CAS5-20A transmission.And then do the qualitative analysis of the fault tree; find its minimum cut set.The can find out the bottom events or assemble of the bottom event which can cause the Top Event to happen,in order to prevent the fault to happen.Then do quantitative analysis of the fault tree,calculate the incidence of top event and the importance of bottom events.Third,through the theory of AHP analysis and discussion,analyze the feasibility of maintenance decision of the transmission.Based on the reliability,maintainability and economic factors,construct the transmission modal of AHP.Then construct judgment matrixes by empirical data,and inspection their consistency.Finally, calculate the weight of three maintenance method,such as breakdown maintenance, preventive maintenance and regulation maintenance.For the maintenance of automobile transmission theory provide valuable reference.Finally,synthesized the research results,and develop decision support system of the automobile transmission maintenance.It can carry out analysis FMEA analysis and FTA analysis of automobile transmission,and it can be used AHP to decide the best maintenance methods.