Risk Assessment Of Axle Crack Based On Fuzzy AHP Comprehensive Evaluation

Nowadays,the rural population transfer to the city in China,the scattered living patterns are gradually replaced by centralized urban living patterns,which led to the rapid development of rail transportation and we are facing more and more challenges.The security of the rail vehicle is the most important thing.As far as the vehicle itself is concerned,the bogie carries the whole load of the vehicle,and the load in the bogie is transmitted to the wheel through the axle.It is thus clear,the safety of the axle can directly affect the safety of the whole vehicle.Detection of the risk of the axle in advance,in a timely manner to exclude the failure of the axle,will bring great guarantee to the safety of railway vehicles.This paper discusses how to use the acoustic emission signal of the axle crack to evaluate the risk,and to provide reference and support for the management and control of the risk of railway vehicle axles.In this paper,fuzzy analytic hierarchy process(F-AHP)and fuzzy comprehensive evaluation are applied to the risk assessment of axle cracks.Relevant theoretical knowledge and specific implementation steps of fuzzy analytic hierarchy process and fuzzy comprehensive evaluation are introduced in detail.The signal acquisition experiment of acoustic emission of simulate axle,get the the experimental data of risk assessment.The dimensionless method is led into transforming the experimental values of the experimental parameters into the parameter evaluation values.Using analytic hierarchy process(AHP)to construct the hierarchical structure model of the AE signal of the axle crack,and establishes the fuzzy consistent judgment matrix to calculate the weight of each index.According to the evaluation value of the parameter,the membership matrix is obtained,and then the fuzzy comprehensive evaluation of the index weight vector and membership matrix is used to get the evaluation result of the axle that is safety level.The evaluation results of risk assessment of five groups of the experimental data and experimental process are basically consistent,which validates the effectiveness of the risk assessment model.The risk assessment model established in this paper not only makes use of the acoustic emission signal index,but also makes use of the mathematical method.Systematically deal with a variety of quantitative and qualitative factors.It reflects the organic unification of fault detection technology and mathematical method,which provides theoretical reference for the management of railway vehicle risk.