Comparison of models for sound propagation of low frequency wind turbine noise

SungSoo Jung; Taeho Park; ByungKwon Lee; JinHyeong Kim; TaeMuk Choi

doi:10.7776/ASK.2024.43.2.162

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2024 Vol.43, Issue 2 Preview Page Next Page

Research Article

Comparison of models for sound propagation of low frequency wind turbine noise 풍력발전기의 저주파 소음 전파 모델 비교

31 March 2024. pp. 162-167

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Abstract

Low frequency noise emitted by wind turbines is one of the most noise complaints. In this study, the reliability of the models was examined by comparing the measured sound pressure levels with the predicted levels based on Denish model and commercial programs of the SounPLAN and the ENPro based on ISO 9613. As a result of applying it to representative 3 MW wind turbines, on lnad, the measured and the predicted values differed within a maximum of 5 dB in the frequency range of 12.5 Hz to 80 Hz. It may be due to the change in the acoustic power levels because the wind turbines have been in operation for more than 7 years. However, considering that the Boundary Element Method (BEM) predicted value, which is known to be the most accurate in the low frequency band, the predicted values are well matched within 2.5 dB, the models of this study are expected to be used as deviation within 3 dB.

Keywords

Wind turbine noise

Low frequency noise

Background noise

Sound power level

Sound pressure level

풍력발전기에서 방사되는 저주파 소음은 가장 관심이 높은 불만족 사항 중의 하나이다. 이에 본 연구에서는 공학적으로 유용하게 사용할 수 있는 덴마크 모델과 ISO 9613에 기초한 상용 프로그램인 SoundPLAN과 ENPro에 의한 풍력발전기 저주파 소음 예측값들과 측정값을 비교함으로써 모델들에 대한 신뢰성을 살펴보았다. 육상에서 대표적인 3 MW급 풍력발전기를 대상으로 적용한 결과 주파수 12.5 Hz에서 80 Hz 범위에서 측정값과 예측값은 최대 5 dB 이내의 차이를 보였다. 이러한 원인으로는 대상 풍력발전기는 7년 이상 운영되었기 때문에 음향파워레벨의 변화가 생겼기 때문으로 추정할 수 있다. 하지만 저주파 대역에서 가장 정확하다고 할 수 있는 Boundary Element Method(BEM) 예측값과 다른 모델에 의한 예측값 그리고 측정값은 2.5 dB 이내로 잘 일치한 점을 고려할 때 본 연구 대상의 모델들은 3 dB 이내의 편차로 활용될 수 있을 것으로 기대된다.

키워드

풍력발전기 소음

저주파 소음

배경소음

음향파워레벨

음압레벨

References

S.-C, Kim and M. J. Choi, "Harmfulness of infrasound and wind turbine noise managements" (in Korean), J. Acoust. Soc. Kr. 40, 73-83 (2021).

Ministry of Environment, "Low frequency noise management guideline" (in Korean), 2018.

The Danish Ministry of the Environment, "Statutory order on noise from wind turbines," Translation of Statutory Order no. 1284, 2011.

ISO 9613-1, "Acoustics-attenuation of sound during propagation outdoors - Part 1: Calculation of the absorption of sound by the atmosphere," 1993.

ISO 9613-2, "Acoustics-attenuation of sound during propagation outdoors - Part 2: General method of calculation," 1996.

IEC 61400-11, "Wind turbines - Part 11: Acoustic noise measurement techniques," 2012.

G.-S. Lee, C. Cheong, H.-T. Kim, and W.-H. Joo, "Time domain prediction and analysis of low frequency noise from wind turbine using hybrid computational aeroacoustics (CAA) method" (in Korean), J. Acoust. Soc. Kr. 32, 369-376 (2013). 10.7776/ASK.2013.32.5.369

E. Blumendeller, L. Gaßner, F. J. Y. Müller, J. Pohl, G. Hübner, J. Ritter, and P. W. Cheng, "Quantification of amplitude modulation of wind turbine emissions from acoustical and ground motion recordings," Acta. Acust. 7, 1-19 (2023). 10.1051/aacus/2023047

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 :2
Pages :162-167
Received Date : 2023-12-11
Accepted Date : 2024-01-08
DOI :https://doi.org/10.7776/ASK.2024.43.2.162

The Journal of the Acoustical Society of Korea ISSN:1225-4428(Print) 2287-3775(Online) 한국음향학회지

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