Parametric Prediction Model of Micro-Pressure Wave Outside the Tunnel

Abstract

Based on the existing micro-pressure wave calculation model, the micro-pressure wave parametric prediction model is put forward. The micro-pressure wave is obtained by using the high order spectrum difference and perfectly matched layer boundary condition technologies. Then the function relationship between micro-pressure wave and spatial distance is discussed. The relevant parameters of the model are got at last .The results are compared with the experimental results. Conclusions are drawn as follows: The peak sound pressure of the micro-pressure wave is proportional to the tunnel axial distance r-0.87, r-0.86, r-0.85, r-0.83 at 200km/h, 250km/h, 300km/h and 350km/h speed, respectively. Comparing the computing results with the experimental results shows the model is of high precision.