| Currently, the rail vehicle is mankind’s most important mechanical transport.It has been widely used. Compared to other modes of transport, high speed railvehicles, once a impact that would cause significant casualties and damage. Railvehicles are now installed in the buffer, each of the vehicles use the same type ofbuffer, and have the same performance. However, when the impact occurs, thesections of the vehicle are not at the same impact, the impact force of the vehicleis exposed, the degree of deformation, the impact of the initial velocity,acceleration, and energy absorption are not the same. When the rail vehicle inimpact, the impact of impact interface buffer is larger than the others, this caneven lead to buffer failures, but the rest of the vehicle suffered received smallerimpact, not even to play its due role. Therefore, analysis of the response of eachbuffer crash to decrease the impact of impact interface buffer is meaningful.This paper describes the working principle of the buffer, the buffer isequivalent to the elastic element and dampers. As an example to six-car subwaycars marshalling, establish the dynamic model of moving vehicle marshallingimpact with the stationary vehicle. Removed the rigid freedom that may occur inthe impact by increasing a minimal constraint. Simulated the impact byMATLAB, determine the response of each vehicle impact corresponding buffer.Determined that the cushion stroke, impact force and the rate of energyabsorption of the buffer in impact interface is the max. Simulate the impact ofmarshalling vehicle impact with a rigid fixed wall to verify the conclusion.Change the damping coefficient and elastic coefficient of each vehicle,analysis of these parameters change during the impact of the impact forcesuffered by the interface buffer, the buffer stroke, and the change ratio of theaverage energy absorption rate of absorption of all the buffers and the totalenergy absorbed by the buffer. The results show that the maximum impact force on impact interface depend on the damping coefficient of impact interface bufferbut independent of the rest of the buffers. Change the damping coefficient andelastic coefficient of the buffer on the impact interface and others can reduce theproportion of energy absorbed by the buffers on the impact interface of the totalenergy. Analysis of six subway car marshalling vehicle impact with a rigid fixedwall, changed the damping and elastic coefficient of each vehicle, then comparedwith the previous conclusion. |
