Resource Documents by Rapley, Bruce

Alves-Pereira, Mariana; Bakker, Huub; Rapley, Bruce; and Summers, Rachel
Infrasound and low-frequency noise – does it affect human health? 
Biomedical engineer Dr Mariana Alves-Pereira recently studied the impact of ILFN from wind turbines in Ireland, concluding that noise regulations need updating to reflect noise levels that endanger human health. Complete article »

Rapley, Bruce; Bakker, Huub; Alves-Pereira, Mariana; and Summers, Rachel
Case Report: Cross-Sensitisation to Infrasound and Low Frequency Noise 
Abstract – This Case Report describes an episode experienced by two noise-sensitised individuals during a field trip. Exposed to residential infrasound and low frequency noise due to coal mining activities, the subjects reacted suddenly, strongly and unexpectedly to pressure pulses generated by a wind farm located at a different town, approximately 160km by road from their residence. Simultaneous physiological data obtained in one subject and subjective sensations occurring during the episode are reported. Acoustical evaluations of the location of the episode . . . Complete article »

Rapley, Bruce
Letter to AMA: audibility and effects of infrasound 
I recently became aware of your position statement on wind farms and health dated 14 March, 2014. I have to say that this public statement has given me great concern with respect to a number of points which I will outline for you. Your opening statement: “Wind turbine technology is considered a comparatively inexpensive and effective means of energy production.” This raises a number of issues that I feel are inappropriate for a medical organisation to comment on. Firstly, line . . . Complete article »

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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