Performance Simulation Analysis And Optimization Design Of The Metro Vehicle Head

In order to meet the lightweight requirements of rail vehicles,composite materials are widely used in rail vehicles due to their superior performance.At the same time,with the subway becoming an important means of urban rail transit,its performance requirements are gradually improved.As an important component of metro vehicles,the structure and performance of the head of metro vehicles is very important to ensure the safe operation of trains.The new composite materials with better mechanical properties,smaller density,higher specific strength,higher specific stiffness,better fire-retardant and sound insulation performance are used,and the combination of material ratio,ply design and structural optimization is used to meet the requirements of component reliability,safety,reducing maintenance and repair costs,while further realizing the lightweight of the structure and improving the static and dynamic performance of the vehicle head.Based on the finite element theory,composite laminate theory,robust optimization theory and structural optimization theory,the performance analysis and optimization design of the cover and frame of the subway car are carried out by means of simulation analysis.The main work of this paper is as follows:First of all,the performance simulation analysis and equivalent design of the structure performance of the subway car head are carried out.Reasonably simplify the structure of the subway car head,use Hyper Mesh to establish the finite element model,based on en12663-2010 standard,load 7 kinds of combined working conditions;in addition,based on the hyperlaminate composite modeling technology,carry out the equivalent design of the composite car head cover,put forward two design schemes of all carbon fiber and glass / carbon hybrid fiber,and the equivalent design of the composite car head cover finite element The modal analysis and static strength analysis of the model are carried out;the preliminary comparative analysis of the equivalent design results is carried out to complete the initial optimization design,which lays the foundation for the multi-objective optimization design of the composite front cover.Secondly,a multi-objective optimization method is proposed for the cover of composite metro car.In this paper,the static and dynamic single-objective optimization design is carried out and the reference data for multi-objective optimization design are obtained for the equal generation design of glass / carbon hybrid fiber metro car front cover.In addition,the weight coefficient of each working condition is determined by AHP,and the comprehensive objective function of static stiffness and dynamic frequency is defined by eclectic programming method to achieve multi-objective freedom Finally,through the optimization of the size and the order of the pavement,the specific scheme of the pavement optimization is obtained.Finally,based on the Taguchi design method and genetic algorithm,the robust optimization design of the head frame of metro vehicle is carried out.In order to improve the load-carrying capacity of the front frame and the robustness of the front frame,two methods are used for the robust optimization design of the front frame.The sensitivity analysis of the headstock is carried out to screen out the design variables that have a great impact on the target response;the parameter design of the headstock is completed by Taguchi robust optimization design method,and the best combination of profile plate thickness parameters is determined by the intuitive analysis method;the headstock robust optimization based on Genetic algorithm is established,and the response surface robust optimization model is established with the maximum signal-to-noise ratio as the optimization target,In addition,the optimization results obtained by the two methods above are compared with the mean value and variance of the original target response.The results show that the robustness of the target response after optimization is improved to some extent.