Structural Improvement and Optimal Design of Large Axle Load Freight Carbody
As an important development direction of freight cars,heavy load and axle load are very important to ensure the safe use of the car body while improving the load and axle load.Cracking problem was studied in depth during large axle weight truck body in the process of application.Firstly,the force situation of the vehicle body structure was analyzed,the data measurement of the vehicle pivoting and blocking process was carried out,the hook load and blocking seat strain data of the blocking process were extracted,the maximum working load was projected according to the measured data,the body strength analysis of the vehicle body was carried out according to the maximum load,the conclusion that the abnormal load leads to cracking was drawn,and an improvement plan for the vehicle body was proposed by combining the finite element method and shape optimization theory.Secondly,the sub-modeling technique is applied to the dimensional optimization of the vehicle body underframe by combining the sub-modeling technique with the agent model,and the experimental design is carried out by Latin hypercube sampling,and the Kriging response surface is established according to the experimental design results,and the multi-objective optimization is carried out with the objectives of minimizing the mass of the underframe and minimizing the maximum Von.mises stress of the underframe,and the mass of the vehicle body underframe is reduced by 3.8%after optimization,and it can meet the optimized underframe mass is reduced by 3.8%and can meet the requirements of longitudinal pulling and blocking of the vehicle,and the feasibility of the optimized results is approved by combining with simulation methods.
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