Characterizing tonal amplitude modulation of wind farm noise

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Abstract

In addition to the overall noise level, periodic variations in the loudness of wind turbine noise, known as amplitude modulation (AM), also significantly contribute to the annoyance experienced by residents living near wind farms. Due to the high dependence of AM on meteorological conditions and the type of wind turbines, the level and duration of AM are hard to predict. These characteristics have an important impact on the annoyance response of residents. The level of annoyance is expected to depend on the AM depth, the number of AM occurrences and the AM continuity. The aim of this paper is to investigate AM characteristics in the vicinity of two wind farms in South Australia. It has been found that to successfully quantify tonal AM based on the “Reference Method” proposed by the UK Institute of Acoustics, removing the A-weighting, changing the range of band-pass filter frequency and reducing the prominence ratio are also necessary. AM density at night-time is much higher than at day time (25% versus 15%). However, there is not significant difference between AM depth at night-time and day time. Furthermore, AM is more likely to occur when the wind turbines are operating significantly below their maximum rated power.

Original languageEnglish
Title of host publicationAustralian Acoustical Society Annual Conference (AAS 2018)
Place of PublicationToowong QLD
PublisherAustralian Acoustical Society
Pages581-590
Number of pages10
ISBN (Electronic)9781510877382
Publication statusPublished - 2019
Event2018 Australian Acoustical Society Annual Conference, AAS 2018 - Adelaide, Australia
Duration: 6 Nov 20189 Nov 2018

Publication series

NameAustralian Acoustical Society Annual Conference, AAS 2018

Conference

Conference2018 Australian Acoustical Society Annual Conference, AAS 2018
CountryAustralia
CityAdelaide
Period6/11/189/11/18

Bibliographical note

Authors are permitted to share the published version of their conference papers in their institution's repository without restriction.

Keywords

  • wind farm noise
  • tonal amplitude
  • modulation

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