Research On Carbody Performance Of General Box Car With 23.5 Ton Axle Load

Railway freight transportation is one of the basic transportation methods of land freight transportation,and it has now become a booster for the development of the national economy.Among them,boxcars,as one of the main transport models of railway cargo transportation,are mostly used to transport railway cargo that cannot be exposed to rain or sun.It has many advantages such as strong applicability,a wide range of transportable cargo types,high utilization rate,and low transportation costs.It occupies a large proportion of the total number of railway freight cars and also has a huge potential market.Nowadays,my country’s railways have gradually implemented separate passenger and freight transportation,and high valueadded goods have higher and higher requirements for railway transportation.Therefore,we design and develop more new railway box cars that meet the needs of users to further increase the load and utilization of railway box cars.Rate has become a very urgent research topic at the moment.However,while increasing the weight and utilization of the boxcar,the safety and reliability of the boxcar body must also be guaranteed.Therefore,this paper takes the 23.5-ton axle load general boxcar body as the research object,and conducts research on its static strength,stiffness,modal,fatigue,and lightweight.The main research contents of this paper are as follows:(1)Introduced the structural composition and characteristics of the 23.5-ton axle load general boxcar body,used Hyper Mesh software to establish the finite element model of the boxcar body,and determined it according to TB/T 3550-2019 "Specifications for Strength Design and Test Appraisal of Locomotives and Rolling Stocks" Four kinds of static strength calculation conditions are calculated,and then the ANSYS simulation calculation software is used to calculate and analyze them;(2)According to TB/T 3550-2019 "Specifications for Strength Design and Test Appraisal of Locomotives and Rolling Stocks",carry out static strength and stiffness tests on the box car body,introduce the load application method and patch position during the test,and compare the test results with simulation The calculation results are compared,and the reasons for the error are analyzed.(3)According to the basic theories and related requirements of modal analysis and stability analysis,carry out modal analysis and buckling analysis on the box car body to obtain the natural frequency,mode shape and unstable parts of the car body structure,and perform analysis on the car body.The stability was evaluated.(4)Based on the "BS 7608-1993" standard,the welded joints are selected,and combined with the load spectrum in the "AARM-1001-2007" standard,the fatigue life of the weak parts of the box car body under three fatigue loads is predicted.(5)Based on the sensitivity analysis method,the Opti Struct optimization module is used to screen the main structure of the car body underframe,and then the size is optimized.On the basis of meeting the structural strength,the end beams,cross beams,longitudinal beams,side beams and other structures of the car body were optimized for weight reduction,and the static strength calculation results before and after optimization were compared and analyzed.