Study Of Carbody Fatigue Strength Of High-Speed Train Under Aerodynamic Load

Car body aerodynamic load fatigue damages are mainly caused by these aerodynamic pressure load difference of loading on the inside and outside of car body. Car body aerodynamic load has an enormous effect on train driving safety and car body strength. The higher speed the vehicle has, the more aerodynamic load, and it is very indispensable to develop the strength study of car body under aerodynamic load.This thesis provides detailed introduction about car body strength analysis, test research and car body strength standard research at home and abroad. By modeling a car body finite element model of high-speed EMU middle train, reference to EN12663:2000, JIS7106 and strength design test appraisal temporary stipulation for 200km/h and higher speed railway train, it finishes the static strength analysis, modal analysis and assesses car body fatigue strength. By use of car body finite element model, simulating different load style of inside aerodynamic load and outside aerodynamic load when car body has aerodynamic load, and analysis influences of two different load methods, meanwhile, analysis influences which was caused by aerodynamic load of car body structural strength, and it brings a necessary reference to car body aerodynamic fatigue test rig.A detailed assessment method of car body aerodynamic load fatigue strength was also introduced, the thesis assesses car body aerodynamic load fatigue strength refer to the method, illustrated by the case of EMU car body structure, preliminary suggestions of aerodynamic load was introduced. Finally, car body aerodynamic load transient analysis research was carried out in the thesis. The basic theory of transient analysis was accounted. Car body aerodynamic load-time history was got by simulating train rendezvous when the train operates in open field and 380km/h. By use of finite element method transient analysis, response of car body structure was got when car body has aerodynamic load. Analysis stress-time history, the paper assesses influence of car body structure strength under transient aerodynamic load.