Experimental Research Of Aerodynamic Load On Sound Barrier Of High-speed Railway

In recent years, building a high-speed railway is more and more popular around the world. At present, the train which has reached speed of350km/h has rolled off the production line, and the train project that will come up with the speed of more than400km/h is going on. However, with the rapid development of high-speed railway traffic, the aerodynamic noise pollution caused by the train is more and more serious. Noise barrier is one of the most important and effective ways to reduce noise pollution. The acceleration of the train speed makes the aerodynamics loads more and more intense, it alse makes a dramatic structural response to the sound barriers.Thus it threats the safety of railway system. In order to ensure the sound barrier structure can work safety,it is requested to reduce the noise well, also to have a good structure for dynamic performance.In this paper, I’m based on the high-speed train’s experimental research of the aerodynamic load on the sound barrier. The main work is as follows:(1) Does a research on test system of the high-speed railway noise barrier on aerodynamic load. It makes a selection and application of the test system software and hardware modules. Then debugs and verificates the system hat based on the testing theory. The rusult shows that the test system can achieve the function of stable data acquisition.The rusult between wind tunnel’s experiment and theoretical value shows a low deviation rate, so the test performance of the system is high and effective.(2) Designs the program of aerodynamic load. In order to effectively test the aerodynamic load of key position, this paper analyzes and demonstrates the program, finally designs to meet the requirements of the study in the test plan.Based on this, completes the aerodynamic load test under the condition of different train operation.(3) Studies the fluctuating pressure on the surface of noise barrier. Based on the experimental test results,this paper anylies the time and frequency domain properties of fluctuating pressure,then anylies the spatial distribution and speed characteristics of the peak value of fluctuating pressure. Also,it studies the influence on the fluctuating pressure of the train’s models and gives the empirical formula of the maximal peak value of fluctuating pressure and the impact strength. The rusult shows that:the peak value of fluctuating pressure have a symmetry distribution in horizontal direction and is on the decline in the vertical direction; The peak value of fluctuating pressure is proportional to2power of train speed, the impact strength is directly proportional to3.5power of train speed.(4) Studies the dynamic response characteristics of noise barrier structure. Based on the experimental test results,this paper anylies the time and frequency domain properties of root’s stress of H-beam pillar,then anylies the spatial distribution and speed characteristics of the peak value of root’s stress. Also,it studies the influence on the fluctuating pressure of the train’s models and gives the empirical formula of the maximal peak value of root’s stress. The rusult shows that:the peak value of fluctuating pressure have a symmetry distribution in horizontal direction; The peak value of normal stress is proportional to2.5power of train speed, the peak value of negative stress is directly proportional to3.5power of train speed.