Numerical Analysis And The Real Vehicle Experiment Study On The Aerodynamic Load Of The Feeder And Fixture In High-speed Railway Tunnel

Many tunnels exist in the high-speed railway, worse more; the tunnel proportion of the total line length is very high. Compression waves and expansion waves generate when the head and the tail of the train run into the tunnel, which are bounced back and stacked up constantly, so the pressure changes and loads on the auxiliary facilities. The result of this process is to brake or fatigue the equipments in the tunnels. The aerodynamic forces loaded on the feeder and its fixture were obtained under different speed levels. The results have great practical significance to ensure the safety using of the auxiliary facilities, otherwise, it not only can guide the design in future, but also can check the design rationality.Based on the principle of aerodynamics, the combination research methods of the numerical analysis and real vehicle experiment is used to measure the aerodynamic load of the feeder and its fixture in tunnels. When the trains run in open air and cross each other in tunnel, the feeder and its fixture variation of the aerodynamic load long with time was researched. The train velocity, the monitoring point position and the length of the feeder are all systematically considered. The results of the numerical calculation and real vehicle experiment are consistent.After the mechanics analysis and bearing capacity verification,the conclusion is that all forces loaded on the fixture is less than the recommended values of bearing capacity,so the feeder fixtures using in tunnel can satisfy the design requirements.