Development of aerodynamic noise measurement method for high-speed trains

Minseung Jung; Jaehwan Kim; Hyung-Suk Jang; Jonghwan Kim; Cheolung Cheong; Kwongi Lee

doi:10.7776/ASK.2024.43.1.131

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2024 Vol.43, Issue 1 Preview Page Next Page

Research Article

Development of aerodynamic noise measurement method for high-speed trains 고속철도차량의 공력소음 측정 시험법 개발

31 January 2024. pp. 131-137

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Abstract

Aerodynamic noise generated by the surrounding flow of a train traveling at high speed affects both outdoor and indoor noise. This study’s goal is to develop a test method to measure and quantitatively evaluate aerodynamic noise through pressure perturbation data on the train surface. To accurately evaluate aerodynamic noise, it is important to separate and evaluate the compressive and incompressible pressure fluctuations mixed in the acquired surface pressure fluctuation data. This is because the noise transmission characteristics of the two pressure fluctuations are different. First, the installation length and interval of the microphone were determined to acquire surface pressure fluctuation data, and wavenumber-frequency analysis was performed to separate incompressible pressure fluctuation and compressible pressure fluctuation to obtain a sound pressure level spectrum. Finally, as a result of comparing the test results measured in the train head and trail, It was confirmed that the pressure fluctuation on the train head surface was greater than that on the tail.

Keywords

High-speed trains

Aerodynamic noise

Wavenumber-Frequency analysis

Interior noise

고속으로 주행하는 열차의 주변 유동에 의해 발생하는 공력소음은 실외소음과 실내소음에 모두 영향을 미친다. 본 연구는 열차표면의 압력섭동데이터를 통해 공력소음을 측정하고 실내소음에 영향을 미치는 성분을 정량적으로 평가하기 위한 시험법을 개발하고 분석하는 것이다. 실내소음을 정확히 평가하기 위해서는 취득한 표면 압력섭동 데이터에서 혼재되어 있는 압축성 압력섭동과 비압축성 압력섭동을 각각 분리하여 평가하는 것이 중요하다. 이는 두 압력섭동의 소음 전달 특성이 다르기 때문이다. 먼저 마이크로폰의 설치 길이와 간격을 결정하여 표면 압력섭동 데이터를 취득하였고, 파수-주파수 분석을 수행하여 비압축성 압력섭동과 압축성 압력섭동을 분리하여 음압 스펙트럼을 취득하였다. 마지막으로 전두부와 후두부에서 측정한 시험 결과값을 비교한 결과 전두부 표면 압력섭동이 후두부 압력섭동보다 더 큼을 확인하였다.

키워드

고속열차

공력소음

파수-주파수 분석

실내소음

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 43
No :1
Pages :131-137
Received Date : 2023-12-06
Revised Date : 2024-01-04
Accepted Date : 2024-01-15
DOI :https://doi.org/10.7776/ASK.2024.43.1.131

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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