Theoretical Analysis on the Array Microphone Measurement for  Noise from Rails

Jungsoo Ryue; Seungho Jang; Hyu-Sang Kwon

doi:10.7776/ASK.2014.33.4.238

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2014 Vol.33, Issue 4 Preview Page Next Page

Theoretical Analysis on the Array Microphone Measurement for Noise from Rails 배열 마이크로폰을 이용한 레일 방사 소음 측정에 관한 이론 해석

31 July 2014. pp. 238-247

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Abstract

In this paper, rail vibration and its sound radiation are investigated, then the rail noise measurement by using microphone array is explored theoretically. A concrete slab track for domestic high speed trains is modeled as a Timoshenko beam on elastic support, regarding the moving of the excitation force on the rail. From the radiation characteristics of rail noise generated by a line source, the effect of moving load on sound radiation is obtained. Also it is found that the beam angle of the microphone array is a prominent factor to measure the rail noise level reliably because the rail noise propagates as a plane wave. In this investigation, a proper beam angle for the rail noise measurement by microphone array is suggested.

Keywords

Rail noise

Moving load

Microphone array

본 논문에서는 철도 전동 소음의 주요 소음원인 레일 소음의 방사 특성을 이론적으로 해석하고 배열 마이크로폰을 이용한 레일 소음 측정 시 발생하는 현상들에 관해 이론적으로 고찰하였다. 철도 궤도는 국내 고속철도 콘크리트 도상 궤도를 대상으로 하였으며, 레일에 고속의 이동 하중이 작용하는 경우에 대한 진동 및 소음 방사 특성을 해석하였다. 본 연구를 통해 이동 하중이 작용할 때 발생하는 레일의 소음 방사 특성을 파악하였으며, 배열 마이크로폰을 이용한 레일 소음 측정시 빔 각도가 배열 마이크로폰 출력 음압에 중요하게 작용함을 확인하였다. 따라서 배열 마이크로폰을 이용해 레일 소음을 규명하기 위해서는 레일의 방사 특성을 반영한 배열 마이크로폰 빔 각도 설정이 필요함을 이해하였다.

키워드

레일 소음

이동 하중

배열 마이크로폰

References

1.D. J. Thompson, Railway Noise and Vibration: Mechanisms, Modelling and Means of Control (Elsevier, Oxford, 2009), Chapter. 2.

2.D. J. Thompson, P. Fodiman, and H. Mahe, “Experimental validation of the TWINS prediction program, part 2: results,” J. Sound Vibration 193, 137-147 (1996).

3.H.-M. Noh, S. Choi, S.-Y. Hong, and S.-W. Kim, “Designing a microphone array system for noise measurements on high-speed trains” (in Korean), J. Kr. Soc. Railway 14, 477-483 (2011).

4.H.-M. Noh, J.-H. Cho, S. Choi, and S.-W. Kim, “Noise sources localization on high-speed trains by using a microphone Array” (in Korean), J. Kr. Soc. Railway, 15, 23-28 (2012).

5.T. Kitagawa and D.J. Thompson, “Comparison of wheel/rail noise radiation of Japanese railways using the TWINS model and microphone array measurements,” J. Sound Vibration 293, 496-509 (2006).

6.T. Kitagawa and D.J. Thompson, “The horizontal directivity of noise by a rail and implications for the use of microphone arrays,” J. Sound Vibration 329, 202- 220 (2010).

7.J. Ryue and S. Jang, “Comparison of track vibration characteristics for domestic railway tracks in the aspect of rolling noise” (in Korean), J. Kr. Soc. Railway 16, 85-92 (2013).

8.S. Jang and J. Ryue, “Study on the rolling noise model using an analysis of wheel and rail vibration characteristics” (in Korean), J. Kr. Soc. Railway 16, 175-182 (2013).

9.J. Ryue and S. Jang, “Characteristics of vibration and sound radiated from rails of concrete slab tracks for domestic high speed trains” (in Korean), Trans. Kr. Soc. Noise Vibration Eng. 23, 605-616 (2013).

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 : 33
No :4
Pages :238-247
Received Date : 2014-03-03
Revised Date : 2014-04-18
Accepted Date : 2014-05-19
DOI :https://doi.org/10.7776/ASK.2014.33.4.238

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

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