Analysis of aerodynamic noise at inter-coach space of high speed trains based on biomimetic analogy

생체모방공학을 적용한 고속철 차간 공간의 공력소음 연구

  • 한재현 (홍익대학교 기계공학과) ;
  • 김태민 (홍익대학교 기계공학과) ;
  • 김정수 (홍익대학교 기계시스템디자인공학과)
  • Published : 2011.10.27

Abstract

Today, high-speed trains enjoy wide acceptance as fast, convenient and environment-friendly means of transportation. However, increase in the speed of the train entails a concomitant increase in the aerodynamic noise, adversely affecting the passenger comfort. At the train speed exceeding 300 km/h, the effects of turbulent flows and vortex sheddding are greatly amplified, contributing to a significant increase in the aerodynamic noise. Drawing a biomimetic analogy from low-noise flight of owl, a method to reduce aerodynamic noise at inter-coach space of high-speed trains is investigated. The proposed method attempts to achieve the noise reduction by modifying the turbulent flow and vortex shedding characteristics at the inter-coach space. To determine the aerodynamic noise at various train speeds, wind tunnel testing and numerical CFD (Computational Fluid Dynamics) simulation for the basic inter-coach spacing model are carried out, and their results compared. The simulation and experimental results reveal that there are discrete frequency components associated with turbulent air flow at constant intervals in the frequency domain

Acknowledgement

Grant : 생체모방공학을 활용한 공학디자인 방법론 개발

Supported by : 한국연구재단