Precision Measurements of Wind Turbine Noise using a Large Aperture Microphone Array

Stuart Bradley, Torben Krogh Mikkelsen, Sabine Von Hünerbein, Mathew Legg

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Experiments are described with a large microphone array (40 m scale) recording wind turbine noise. The array comprised 42 purpose-designed low-noise microphones simultaneously sampled at 20 kHz. Very high quality, fast, meteorological profile data was available from nearby 80 m masts and from the turbine nacelle, giving wind speed, wind direction, and turbulence data. A speaker was mounted at the base of the turbine tower, for determining the spatial characteristics of coherence, and for compensating for local wind variations. This speaker emits a continuous dual tone (allowing continuous time-of-flight at each microphone). An experiment was also run recording the sound from a continuous tone speaker mounted near the tip of a turbine blade, allowing testing of signal processing to correct for the very substantial Doppler shift. These various experiments are targeted at obtaining very high spatial and temporal resolution acoustic images of the sound emitted from turbine blades. An overview of some of the first results from this work will be given.
Original languageEnglish
Title of host publicationProceedings of the 6th Berlin Beamforming Conference
Number of pages11
Publication date2016
Publication statusPublished - 2016
Event6th Berlin Beamforming Conference 2016 - Berlin, Germany
Duration: 29 Feb 20161 Mar 2016

Conference

Conference6th Berlin Beamforming Conference 2016
Country/TerritoryGermany
CityBerlin
Period29/02/201601/03/2016

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