EFFECT OF SPECTRUM CHARACTERISTICS OF SEISMIC WAVE ON DERAILMENT OF HIGH-SPEED TRAIN
In order to investigate the dynamic responses of a high-speed train under earthquake and the effect of spectrum characteristics of seismic wave on high-speed railway vehicle derailment,a coupling vehicle/track dynamic model with an earthquake excitation is put forward,in which the vehicle is modelled as a 35 DOF multi-body system with nonlinear suspension characteristic and the slab track is modelled as a discrete elastic support model,which consists of rails fasteners,track slabs and a Cement Asphalt Mortar layer.Rails are assumed to be Timoshenko beams supported by discrete rail fasteners,and the slabs are modelled as solid finite elements.A moving track support model is used to simulate the effect of the periodical discrete track supports on the vehicle/track interaction,and the earthquake motions are simplified as cyclic lateral sine waves for the boundary input of the coupling vehicle-track system.The detailed numerical simulation makes an investigation into the dynamic behaviour of a high-speed railway vehicle excited by the earthquake excitation,and focuses on analyzing the effect of seismic wave spectrum on derailment mechanism of a high-speed vehicle.Through the numerical analysis,it is found that the spectrum characteristics of seismic wave have a great effect on the dynamic responses and derailment mechanism,also the operation safety of a high-speed railway vehicle.