Noise monitored for planned wind farm
A
Bruel and Kjaer product story
Edited by the Engineeringtalk editorial team
Dec 11, 2008
Bruel and Kjaer has provided noise management terminals for Meridian, an energy provider in Wellington, New Zealand, to monitor background noise prior to the installation of a wind farm.
As one of the windiest cities in the Southern hemisphere, Wellington is ideal for wind farming, but the plans for installing up to 68 wind turbines caused locals to raise concerns about the potential noise impact.
Local energy provider, Meridian, was asked to monitor background noise at five of its wind farm locations before building of the site began, but wind turbine noise is notoriously difficult to measure, as the low sound does not trigger sound level monitors.
By using several noise management terminals from Bruel and Kjaer, Meridian was able to set up timed recordings to carry out its investigation.
The equipment used consisted of an environmental noise management server (Version 2) Type 3642, five noise monitoring terminals Type 3639-E-203 with weatherproof microphone units Type 4198, and MM-0256 weather stations.
A time trigger recording option was created, to capture sound recordings and the data saved as WAV files (instead of MP3) for subsequent tone assessment.
In the UK, many local authorities receive complaints about low-frequency noise, but subsequent investigations are difficult and time-consuming.
With the introduction of noise monitoring instruments, such as Bruel and Kjaer's 2250 hand-held analyser - with built-in sound recording and logging 1/3 octave frequency spectrum - the procedure for practical assessment has been simplified.
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