Performance Analysis And Optimization Of C70E General Gondola Car Body

The railway gondola car is one of the main vehicle equipments for railway transportation.With its versatility and adaptability,it plays an irreplaceable role in railway transportation.Countries have achieved enormous economic and social benefits through the development of gondola car transportation.The development of gondola cars in China is a process of continuous improvement in design and production level of gondola cars.However,with the rapid development of the national economy,the railway transportation capacity is becoming increasingly tense,resulting in the continuous improvement of vehicle turnover rate,which has brought serious challenges to the performance of vehicles.Some problems and shortcomings have also been exposed in the process of railway transportation by the side door opening of C70E general gondola car,which affects the order of Railway transportation and brings hidden dangers to the safety of vehicle transportation.Therefore,on the basis of studying the structural type of the open door and the causes of the problems of the door joint,a new design scheme of the side door was proposed,and the optimized car body was analyzed by finite element method.In this paper,the optimized C70E gondola car body is taken as the research object.According to the requirements of TB/T 1335-1996 "Code for Strength Design and Test Evaluation of Railway Vehicles" and AAR M-1001-2007 "Railway Vehicle Design and Manufacture Specification",the static analysis,modal analysis,linear buckling and fatigue evaluation of the structure of C70E gondola car body are carried out,and the static strength test and modal test of the car body are carried out.The research work mainly includes:1)Analyze the cause of side door failure of C70E gondola car,through changing the material of door plate,changing the door sealing structure and other optimization schemes,ensure the performance of the door and optimize the body structure.The finite element model of car body steel structure is established by using HyperMesh software of Altai Company,USA,and the calculation conditions are determined.The static strength of the model is analyzed by using ANSYS software of ANSYS Company.2)In order to predict the natural vibration frequency,vibration mode and structural stability of the C70E gondola body structure,verify the modified car body structure and study the dynamic performance of the optimized car body structure,the modal analysis and linear buckling analysis of the car body structure are carried out by software.3)Evaluate the fatigue life of the C70E gondola car body structure,select the fatigue performance data according to AAR M-1001-2007 "Railway Vehicle Design and Manufacture Specification",and use ANSYS software to carry out finite element analysis of the car body structure under fatigue condition.Calculate the fatigue damage of the key welded structure of the car body.4)The test method,test process and test results of static strength test and modal test of car body are introduced,and the results are compared with the analysis results.The rationality and scientific of the structure design are guaranteed from two aspects of analysis,calculation and test.The results show that the structure strength of the optimized gondola car body is enough,the stability is good,the performance meets the requirements of railway transportation,and solved the problem of the gondola car doors defects.