Investigation of the time dependent nature of infrasound measured near a wind farm

Branko Zajamsek; Kristy Hansen; Colin Hansen

Investigation of the time dependent nature of infrasound measured near a wind farm

Branko Zajamsek, Kristy Hansen, Colin Hansen

Research output: Contribution to conference › Paper › peer-review

Abstract

It is well-known that wind farm noise is dominated by low-frequency energy at large distances from the wind farm, where the high frequency noise has been more attenuated than low-frequency noise. It has also been found that wind farm noise is highly variable with time due to the influence of atmospheric factors such as atmospheric turbulence, wake turbulence from upstream turbines and wind shear, as well as effects that can be attributed to blade rotation. Nevertheless, many standards that are used to determine wind farm compliance are based on overall A-weighted levels which have been averaged over a period of time. Therefore the aim of the work described in this paper is to investigate the time dependent nature of unweighted wind farm noise and its perceptibility, with a focus on infrasound. Measurements were carried out during shutdown and operational conditions and results show that wind farm infrasound could be detectable by the human ear although not perceived as sound.

Original language	English
Publication status	Published - 1 Jan 2014
Event	43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control - Melbourne, Australia Duration: 16 Nov 2014 → 19 Nov 2014 Conference number: 43

Conference

Conference	43rd International Congress on Noise Control Engineering
Abbreviated title	INTERNOISE 2014
Country	Australia
City	Melbourne
Period	16/11/14 → 19/11/14

Keywords

Crest factor
Infrasound
Ohc threshold
On and off wind farm
Wind farm noise

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title = "Investigation of the time dependent nature of infrasound measured near a wind farm",

abstract = "It is well-known that wind farm noise is dominated by low-frequency energy at large distances from the wind farm, where the high frequency noise has been more attenuated than low-frequency noise. It has also been found that wind farm noise is highly variable with time due to the influence of atmospheric factors such as atmospheric turbulence, wake turbulence from upstream turbines and wind shear, as well as effects that can be attributed to blade rotation. Nevertheless, many standards that are used to determine wind farm compliance are based on overall A-weighted levels which have been averaged over a period of time. Therefore the aim of the work described in this paper is to investigate the time dependent nature of unweighted wind farm noise and its perceptibility, with a focus on infrasound. Measurements were carried out during shutdown and operational conditions and results show that wind farm infrasound could be detectable by the human ear although not perceived as sound.",

keywords = "Crest factor, Infrasound, Ohc threshold, On and off wind farm, Wind farm noise",

author = "Branko Zajamsek and Kristy Hansen and Colin Hansen",

year = "2014",

month = jan,

day = "1",

language = "English",

note = "43rd International Congress on Noise Control Engineering : Improving the World Through Noise Control, INTERNOISE 2014 ; Conference date: 16-11-2014 Through 19-11-2014",

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TY - CONF

T1 - Investigation of the time dependent nature of infrasound measured near a wind farm

AU - Zajamsek, Branko

AU - Hansen, Kristy

AU - Hansen, Colin

N1 - Conference code: 43

PY - 2014/1/1

Y1 - 2014/1/1

N2 - It is well-known that wind farm noise is dominated by low-frequency energy at large distances from the wind farm, where the high frequency noise has been more attenuated than low-frequency noise. It has also been found that wind farm noise is highly variable with time due to the influence of atmospheric factors such as atmospheric turbulence, wake turbulence from upstream turbines and wind shear, as well as effects that can be attributed to blade rotation. Nevertheless, many standards that are used to determine wind farm compliance are based on overall A-weighted levels which have been averaged over a period of time. Therefore the aim of the work described in this paper is to investigate the time dependent nature of unweighted wind farm noise and its perceptibility, with a focus on infrasound. Measurements were carried out during shutdown and operational conditions and results show that wind farm infrasound could be detectable by the human ear although not perceived as sound.

AB - It is well-known that wind farm noise is dominated by low-frequency energy at large distances from the wind farm, where the high frequency noise has been more attenuated than low-frequency noise. It has also been found that wind farm noise is highly variable with time due to the influence of atmospheric factors such as atmospheric turbulence, wake turbulence from upstream turbines and wind shear, as well as effects that can be attributed to blade rotation. Nevertheless, many standards that are used to determine wind farm compliance are based on overall A-weighted levels which have been averaged over a period of time. Therefore the aim of the work described in this paper is to investigate the time dependent nature of unweighted wind farm noise and its perceptibility, with a focus on infrasound. Measurements were carried out during shutdown and operational conditions and results show that wind farm infrasound could be detectable by the human ear although not perceived as sound.

KW - Crest factor

KW - Infrasound

KW - Ohc threshold

KW - On and off wind farm

KW - Wind farm noise

UR - http://www.scopus.com/inward/record.url?scp=84923556819&partnerID=8YFLogxK

M3 - Paper

T2 - 43rd International Congress on Noise Control Engineering

Y2 - 16 November 2014 through 19 November 2014

ER -