Optimization Research On Headcar Body Structure Of Straddle-Type Monorail Vehicle

With the sustained and rapid development of Chinese cities and urbanization process,traffic problems are becoming increasingly prominent,and solving the increasingly serious urban rail transit problem through a three-dimensional rapid rail transit problem is a new direction for the future development of the city.For the development of rail transit vehicles,on the basis of ensuring safety,it is still very important to save manufacturing costs,improve the utilization rate of materials,and achieve better economic benefits,so lightweight design is an important research direction.In this paper,the finite element software is used to simplify the geometric model of the head car of a straddle monorail vehicle in China,and the finite element model is established on this basis.According to BS EN 12663-1: In 2010 "Railway Application--Structural Requirements of Railway Vehicle Body",the finite element analysis of eleven working conditions was carried out,and the results show that the car body structure meets the specified strength,stiffness and modal standards.From the results,it can be seen that the strength and stiffness of the car body have a large margin,indicating that the material is not fully utilized,and the lightweight design of the structure can be carried out to improve the utilization rate of the material.Based on Opti Struct software and submodel analysis method,the submodel is extracted and its validity is verified.The middle part of the underframe model was selected as the design domain,which was optimized based on the topological optimization method,and the optimized cross-sectional distribution of the underframe was designed according to the calculation results.After optimization,the weight of the chassis is reduced by 0.24 t,and the weight of the chassis is reduced by 17.3%.Based on the layout design of the optimized cross-sectional gluten plate of the underframe,27 design variables were selected through sensitivity analysis to optimize the size of the car body.The static strength,stiffness and modal analysis results of the optimized vehicle all meet the requirements of relevant standards or specifications.After two times of optimization,the final weight loss rate of the car body is 8.1%.