Study on Aerodynamic Load Characteristic of Noise Barrier for High-speed Railway

So the noise barrier has been the mainly measure to reduce noise along the railway, the aerodynamic noise will raise sharply as the running speed of the train continues to increase and transient impact caused by train operation impact on the noise barrier is increasing as well. Therefore, it's necessary to grasp the characteristics of aerodynamic load when high-speed trains passing through the noise barrier. Using the finite element method, a two-dimensional numerical simulation model was established to calculate the insertion loss of the high-speed railway sound barrier and evaluate the acoustic performance of the sound barrier. Then, we designed a new form of high-speed noise barrier combining the advantages of the Schroder diffuser and the micro-perforated acoustic barrier. Based on the aerodynamics theory, the three-dimensional model of sound barrier and high-speed train is established and the fluid simulation software is used to simulate the process of the train passing through the noise barrier. We have gotten the distribution of pulsating pressure on the surface of the noise barrier with different structures and the pulsating time history characteristics of the sound barrier surface in measuring points.