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Resource Documents by Bakker, H.H.C.

Bakker, H.H.C.; Rapley, Bruce; and Elliott, R.
Environmental Noise: Better Measures and Reporting Needed
ABSTRACT: In measuring the environmental noise level for such purposes as compliance monitoring and nuisance noise assess- ment, the most often used statistic is the A-weighted sound pressure level (SPL), often reported as a percent ex- ceedance level (e.g. L10 or L90) averaged over a time interval such as 10 minutes or 24 hours. This statistic can not be relied upon in situations where noise has ‘special audible characteristics,’ such as modulation or tonality, since increases in the sound pressure . . . Complete article »

Bakker, H.H.C.; Bennett, D.J.; Rapley, Bruce; and Thorne, R.
Seismic Effect on Residents from 3-MW Wind Turbines
Abstract Residents on a river plain at the foot of the Tararua Ranges, New Zealand, experience ongoing noise problems, including sleep deprivation, thought to emanate from a nearby wind farm in the ranges to the east (closest V90 turbine is 3 km away). The problem is worst when wind is from the eastern quadrant. Installation of ‘Hush Glass’ only partly alleviated the problem indoors. Continuous time series recording of seismic noise using a buried L4 geophone and acoustic surface microphone . . . Complete article »

Bakker, H.H.C.; and Rapley, Bruce
Problems measuring low frequency sound levels near wind farms
ABSTRACT: It is current practice to measure sound pressure levels (SPL) from wind farms at a handful of locations in the surrounding countryside. These can be placed near sensitive areas such as residences to provide an indication of the SPL at that point and are used in conjunction with sound level prediction software to infer sound level throughout the affected areas. This paper reports a literature review of human perception of low-frequency sound before describing investigations into sound levels at . . . Complete article »

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