Study On The Wind-Induced Security Of High-Speed Trains

With the development of high speed railway and train speed, interaction between train and air fluctuates violently. A series of aerodynamic problems deteriorating running safety demand a prompt solution. The interaction between high-speed trains and air becomes an important engineering problem related to safe operation of high-speed railway, and it is a key technical problem which must be solved in the development of high-speed railway in China. This thesis combines aerodynamics and multi-body system dynamics to study the characteristics of wind-induced security of high speed trains on the flat ground, embankment and viaduct.Based on the the 3-D steady and incompressible Navier-Stokes equation, and standard k-s turbulence model, this thesis establishes a dynamic simulation model of high-speed trains with the help of computational fluid dynamics software FLUENT, and calculates the external fluid fields of high-speed trains under different running speeds, different wind speeds, different wind angles and different road conditions (flat ground, embankment and viaduct), then analyses the impact of running speeds, wind speeds, wind angles and road conditions on the aerodynamic loads.In order to study the running safety of high-speed trains under side-winds, this thesis uses the multi-body system dynamic simulation software to establish a multi-body system dynamic model, on which the aerodynamic loads are dealt with as external loads to study the influence of side-winds on the running safety of high speed trains. With this model, this thesis simulates the response of high-speed trains running on the flat ground, embankment and viaduct under the different train speeds and different wind speeds, and calculates the safety indexes of the coefficient of derailment, rate of wheel load reduction, lateral force of wheel axle and vertical force of wheeltrack. With reference to the "Testing of High-speed Electic Multiple Unit on Completion of Construction", this paper gives the running security domain of high-speed trains under side-winds on the open line, which provides reference to the safe operation of high-speed trains under side-winds.