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Resource Documents: Technology (142 items)

RSSTechnology

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Unless indicated otherwise, documents presented here are not the product of nor are they necessarily endorsed by National Wind Watch. These resource documents are shared here to assist anyone wishing to research the issue of industrial wind power and the impacts of its development. The information should be evaluated by each reader to come to their own conclusions about the many areas of debate. • The copyrights reside with the sources indicated. As part of its noncommercial effort to present the environmental, social, scientific, and economic issues of large-scale wind power development to a global audience seeking such information, National Wind Watch endeavors to observe “fair use” as provided for in section 107 of U.S. Copyright Law and similar “fair dealing” provisions of the copyright laws of other nations.


Date added:  October 4, 2019
Noise, TechnologyPrint storyE-mail story

Use of synthesised or actual wind turbine noise for subjective evaluation purposes

Author:  Cooper, Steven

ABSTRACT—
There are technical difficulties in producing an accurate wind turbine noise signal for subjective testing of the noise characteristics for different operational scenarios of wind turbines. There are differences in the subjective response when limiting the test signals to infrasound only versus the use of full spectra. The concept of “nocebo” effect that has been presented has relied upon the use of “synthesised wind turbine infrasound” that does not reflect the signature or pressure pulsations observed in full-spectrum field measurements. The validity of “synthesised wind farm infrasound signals” that have been used in such testing is examined and compared with full-spectrum signals.

Turbine noise emission components with building and human body resonances superimposed

Steven Cooper, The Acoustic Group, Australia

Proceedings of the 23rd International Congress on Acoustics, 9–13 September 2019, Aachen, Germany: pages 912–919

Download original document: “The use of synthesised or actual wind turbine noise for subjective evaluation purposes

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Date added:  October 2, 2019
Noise, TechnologyPrint storyE-mail story

Simplified method for determination of “amplitude modulation” of audible and inaudible wind turbine noise

Author:  Cooper, Steven

ABSTRACT—
The operation of a wind turbine results in a series of pulses where there is a significant instantaneous increase in the amplitude of the pressure signal dependent upon the loading (power output and wind strength) of the wind turbine. Such amplitude variations can be significant. The modulation of the amplitude of the acoustic signature for wind turbines is often referred to as “amplitude modulation”. One method of assessment of the degree of amplitude modulation for a wind turbine used in the UK is complex, time-consuming and expensive to undertake. A simplified method has been developed that is not just restricted to the dBA level and can be used to cover both inaudible and audible dynamically pulsed amplitude modulation. This simplified analysis method is not just restricted to wind turbine noise but has uses for other pulsating noise sources. Investigation of recreational music and industrial noise sources that give rise to the generation of pulsations occurring at an infrasound rate using the simple methodology is discussed.

Steven Cooper, The Acoustic Group, Australia

Proceedings of the 23rd International Congress on Acoustics, 9–13 September 2019, Aachen, Germany: pages 920–927

Download original document: “A simplified method for determination of “amplitude modulation” of audible and inaudible wind turbine noise

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Date added:  September 20, 2019
Health, Noise, TechnologyPrint storyE-mail story

Influence evaluation of infrasound by using both of biological information and infrasound sensors in the vicinity of wind turbine facilities

Author:  Nagamatus, Megumi; and Yamamoto, Masa-yuki

ABSTRACT—
In recent years, wind power generation attracts attention. However, problem of low frequency sound generated by wind turbines and its influence on human beings have been gradually taken up in society. We investigated the influence of ultra-low frequency sound generated from wind turbines on human subjects/testers from both aspects of measurement of audible/infrasonic sound and multiple biometric information sensing systems. In the experiment outside, portable electroencephalographs and pulse wave sensors are used because only such small equipment can be used to perform biological information sensing outdoor, in the vicinity of a wind turbine facility. In order to calculate relax trends from the obtained biological information, a method based on previous analyses for obtaining relaxation degrees R is used. It is coming from the fact that content rate of each frequency band included in the electroencephalogram waveform varies depending on the human mental state in the brain wave. Also, in analyzing the heart beat wave, we used an analytical method to find stress degrees S by using the balance of autonomic nerve that can be calculated from the heart beat signal fluctuations. Here we would like to introduce the result using the above analyses methods for almost 30 examples.

Megumi NAGAMATSU, Masa-yuki YAMAMOTO
Kochi University of Technology, Japan

Proceedings of the 23rd International Congress on Acoustics, 9–13 September 2019, Aachen, Germany: pages 2992–2999

Download original document: “Influence evaluation of infrasound by using both of biological information and infrasound sensors in the vicinity of wind turbine facilities

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Date added:  September 19, 2019
Noise, Regulations, Sweden, TechnologyPrint storyE-mail story

In situ measured facade sound insulation of wind turbine sound

Author:  Thorsson, Pontus

ABSTRACT—
In most countries there are regulations of wind turbine sound level outdoors at dwellings. Often there are also regulations of the sound levels inside the dwelling, however not often directly aiming at wind turbine sound. The sound level indoors from wind turbines has attracted more interest in the latest years, and then especially in the low frequency region (up to 200 Hz). Studies on the in situ sound level difference between outside and inside of dwellings are however scarce. This paper presents the in situ measured sound level difference for two Swedish houses in rural locations, both using a loudspeaker and using the wind turbine sound as exciting signal. This is possible due to a 2 month long measurement series with simultaneous sound recordings outside and inside. The sound pressure level differences from the two methods are shown to differ substantially.

Pontus THORSSON, Akustikverkstan, Lidköping, Sweden

Proceedings of the 23rd International Congress on Acoustics, 9–13 September 2019, Aachen, Germany: pages 3826-3830

Download original document: “In situ measured facade sound insulation of wind turbine sound

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