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Tag: infrasound

10- Comparison analysis of noise generated by wind turbines with the other noise source in outdoor environment13-

Napisane przez admin w dniu . Opublikowano w Publikacje.

The paper presents a comparison analysis of the noise generated by wind turbines and the one generated by a ventilation shaft of a working coal mine. The aim of the research was to compare the frequency and amplitude distribution of those sources, especially in the infra range. The ultimate aim it is evaluate possible environmental impact on human annoyance or severity. During the research noise signals were recorded utilizing low frequency microphones, shielded by windscreens. Microphones were localized at the heights of 0.0 m, 1.5 m (approximate location of a human ear in a standing position) and 4 m. Additionally, a measurement position of a microphone in relation to the ground surface was observed. Measurements at ground level were performed according to the standard PN-EN 61400-11:2013-07 and in vertical position, where the microphone was mounted „upside down” with the grid flush with the board. The possible influence of wind speed was also monitored. The results of the measurements are discussed.

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7- Review of evaluation criteria for infrasound and low frequency noise in the general environment

Napisane przez admin w dniu . Opublikowano w Publikacje.


It has been suggested that infrasound (IS) and low frequency noise (LFN) may be responsible for adverse health effects in people living in the vicinity of wind farms. Many studies have indicated that the basic noise measure − an A-weighted sound pressure level (SPL) − is a less suitable descriptor for assessing the effects of IS and/or LFN. Thus, this paper reviews existing or proposed methods for evaluating infrasound and LFN in residential areas with regard with their impact on human health and wellbeing.

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2- Experimental Verification of the Usefulness of Selected Infrasound and Low-frequency Noise (ILFN) Indicators in Assessing the Noise Annoyance of Wind Turbines

Napisane przez admin w dniu . Opublikowano w Publikacje.

This paper presents an overview of the indices used in evaluating ILFN noise, based on C and G weighting curves and LC-LA difference parameter, as well as curves compared to the loudness threshold curve. The research section includes measurement results of wind turbine (WT) noise along with proposed indicators for evaluating this noise in the infrasound and low-frequency bands at distances of 250 m, 500 m and 1000 m from the turbine. The results obtained indicate low noise levels in the infrasound band, lower than the threshold curves from a dozen or so dB in the upper part of this band to nearly 60 dB in the lower part. The L C-L A indicator has been shown to be of poor utility for evaluating low-frequency noise, with the LG indicator reasonably useful for evaluating infrasound noise.

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