| With the acceleration of urbanization, the pattern of the city develop towards the polycentric and balanced direction, and the central and the surrounding areas are deeply interconnected, which producing a large amount of commuter traffic. Because of the advantages of environmentally-friendly, large capacity, punctuality, public transport operation mode, suburban express, that increasing popularity by the decision maker, is become the first choice to solve the traffic problem between urban centers. Vehicle as a tool for carrying passengers, is one of the suburban express key technologies. Therefore, the study of suburban express vehicles adapted to our national conditions is necessary.First of all, the essay introduce the development of suburban express at home and abroad. On this basis, the essay summarize the characteristics of suburban express vehicles and some suggestions on development of suburban express vehicles in China. According to the function and specific features of Chengdu Metro Line 18, the essay propose the principles that the lectotype of vehicle technology plan should follow, and then according to operation needs, the essay discuss the service standard, max operation speed and train current collection mode of the vehicle. According to the main technology requirements of the vehicle, the essay discuss the lectotype of the technology plan of the vehicle main parts, and obtains the vehicle technology plan that adapting the needs of Chengdu Metro Line 18.Based on multi-body dynamics theory, the essay reasonably make simplification and assumption of the vehicle system and, do force analysis of rigid bodies that compose the vehicle, and then establish a simulation mode for dynamic calculation in multi-body dynamic simulation software SIMPACK. The essay introduce the method and standard of the assessment of vehicles dynamics performance, and then optimize the primary and second suspension of suburban express vehicle by getting a comprehensive performance including lateral stability, ride comfort and curve negotiation. According to the optimal suspension parameter, the essay assess and predict the dynamic performance of Tc and Mp car running in empty and overload mode by multi-body simulation software SIMPACK. The prediction result shows that:the critical speed of new wheel and wear wheel of the two type car running in empty and overload mode meet the requirements. The max lateral acceleration and vertical acceleration of the two type car running in empty and overload mode meet the requirements of UIC-518, and lateral and vertical stability index are less than 2.5, reaching GB/T5599-1985 excellent standards. The curve negotiation performance including wheel/rail lateral force, lateral wheelset force, derailment, rate of wheel load reduction, overturning coefficient of the two type car running in empty and overload mode, which simulating 7 kinds of curves, meet the range of requirements of GB/T5599-1985. The wave length and depth of welded joints of the rails has a significant influence on W/R action force.When the wave length is short than 0.5m or the wave depth is deeper than 0.7mm, the line should be maintained to guarantee operational safety. The offset distance of wheel centroid has a significant influence on W/R action force. Reasonable control of the offset distance of wheel centroid can effectively improve the dynamic action between wheel and rail.According to the function and basic characteristic of Chengdu Metro Line 18, the essay discus the lectotype of suburban express vehicle’s main parameters and technical plan, and optimize the suspension parameters. Finally the essay assess and predict the vehicle dynamic performance, which providing a theoretical foundation for our country’s suburban express vehicle research. |
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