Impact Resistance Subway Vehicles Energy-absorbing Structure

With the development of traffic and transportation and the development of main railway line, the urban rail transportation (subway and light rail) has come into a new developmental climax. However, in the process of the development of railway traffic and transportation, the running safety of the railway vehicles has becoming the focus of the public. So the crashworthy car-body whose design conception is " focusing on people" has becoming technical characteristic and developmental trend of the new type car-body of train.Taking the vehicles of subway for example, this paper studies the general design method of energy-absorbing structures of crashworthy car-body. It divides the energy-absorbing process of the head car impact into four steps: the first step is the rubber buffer of the buffer equipment of vehicle coupler; the second is the buffer with collapsible tube; the third is the cut bolt of vehicle coupler; and the fourth is the special energy-absorbing structures and the anti-climbers on the underframe of head car. And it carries out the theoretical research on the dynamic problems of nonlinear, large deformations, and large strain in vehicles colliding based on explicit dynamic finite element. Based on the research of the typical energy-absorbing equipments, it designs the energy-absorbing structures, studies the anti-climber performance of the subway vehicle, and carries out both impacting experiments of trolley and numerical calculations and their correlative analysis. All the results indicate that the energy-absorbing structures have good mechanical property and energy-absorbing effect. In the later the paper sets up nonlinear finite element model of the head car to conduct numerical calculations in some impacting cases. During the process of impacting, steady and ordered flexed plastic deformation occurs on the component from anticipative part, and only elastic deformation occurs on the load-bearing structures of the car-body. A majority of the impacting kinetic energy (more than 80%) dissipates due to the plastic deformation of the components. Results show that the car-body has good crashworthy effect. The work done in this paper is of theoretical significance and practical value.