Location and quantification of noise sources on a wind turbine

Oerlemans, Stefan; Sijtsma, Pieter; López, Beatriz Méndez

doi:10.1016/j.jsv.2006.07.032

Cited by 363 publications

(204 citation statements)

References 20 publications

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“…Oerlemans [13,14] presents a theoretical model that explains directivity observed in the field. In summary, noise levels are expected to be low in the plane of the wind turbine blades, but fluctuation strength is strong, leading to an expected maximum in fluctuation strength at angles close to but not coinciding with the plane of the blades.…”

Section: Origins Of Wind Turbine Noisementioning

confidence: 99%

Reduction of Wind Turbine Noise Annoyance: An Operational Approach

Bockstael¹,

Dekoninck²,

Can³

et al. 2012

Acta Acustica united with Acustica

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This paper investigates the relationship between wind turbine noise annoyance, exposure indicators, operational characteristics and environmental variables. A six-month field experiment at an industrial site near a residential area includes regular on-line annoyance reports, continuous 1/3-octave band noise level registrations, periodic sound recordings, data on electricity production per minute and meteorological observations. Here the risk of high annoyance does not only depend on the angular blade velocity, but also on the wind turbines' nacelle position relative to the location of the dwellings, i.e. the wind direction. This directivity effect can be captured when noise parameters such as the background noise level caused by other sources and a so-called fluctuation-indicator are introduced, the latter calculated from the 1/3-octave band spectra to quantify the periodic part of wind turbine noise. In addition, the calculated turbine's specific emission levels are closely related to the angular blade velocity, and an important parameter to predict the risk of high annoyance. Finally, these results suggest that operational restrictions based on wind direction together with the angular blade velocity might help to reduce noise annoyance while preserving cost-effectiveness.

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Section: Origins Of Wind Turbine Noisementioning

confidence: 99%

Reduction of Wind Turbine Noise Annoyance: An Operational Approach

Bockstael¹,

Dekoninck²,

Can³

et al. 2012

Acta Acustica united with Acustica

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show abstract

“…The sound from modern wind turbines is mainly generated from the turbulent boundary layer at the blade's trailing edges [4] and is commonly described as a "swishing" sound by nearby residents [2]. In an earlier study, Persson-Waye and Öhrström [5] investigated how several psycho-acoustic parameters influence the perception of wind turbine noise.…”

Section: Introductionmentioning

confidence: 99%

Listening Test Comparing A-Weighted and C-Weighted Sound Pressure Level as Indicator of Wind Turbine Noise Annoyance

Bolin¹,

Bluhm²,

Nilsson³

2014

Acta Acustica united with Acustica

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A listening test was conducted to investigate whether A-or C-weighed sound levels are most suitable as indicator of annoyance due to wind turbine noise. The tests consisted of fifteen different wind turbine noises presented at eight sound levels together with pink noise signals as reference sounds. A total number of 31 persons performed the listening test divided into two subgroups. The first group comprising of 20 students conducted the test in a semi anechoic chamber, and the second group of 11 residents annoyed by wind turbine noise in their homes, conducted the test in their own homes. Results from both subgroups showed that A-weighed sound levels were a more accurate description of wind turbine noise annoyance than C-weighed sound levels. The residents found the same wind turbine noises more annoying than the students, indicating a higher sensitivity to wind turbine noise among persons a priori annoyed by this noise and exposed to this source in their residential settings.

QC 20140915

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“…The aerodynamic noise is generally considered to be the dominant source of noise generated by a modern large-scaled wind power plant (Oerlemans et al 2007). However, the mechanism of generating the aerodynamic noise has not been hydrodynamically elucidated yet owing to the complicated structures.…”

Section: Introductionmentioning

confidence: 99%

“…Although some investigations on the aerodynamic noise have been carried out (Bjorkman 2004;Oerlemans et al 2007;Pedersen and Waye 2004, 2007, 2008Pedersen et al 2009;Pedersen 2011;Zhang et al 2012;Genescà et al 2013), an argument about the relationship between the aerodynamic noise and the human physiological condition has not been fully settled yet. In particular, not only any mechanism of generating the infrasound noise with extremely low-frequency bands, but also any influence on human physiology has not been elucidated.…”

Section: Introductionmentioning

confidence: 99%

Analysis of aerodynamic sound noise generated by a large-scaled wind turbine and its physiological evaluation

Inagaki

Nishi

2014

Int. J. Environ. Sci. Technol.

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Aerodynamic noise generated from a modern large-scale wind turbine was measured and analyzed from an engineering point of view. The measurement items were the sound, the sound pressure level (including the infrasound with extremely low-frequency band) and the corresponding physiological evaluation. Fifteen test subjects received various sound stimuli, including the recorded aerodynamic noise and a synthetic periodical sound, were examined with an electroencephalogram as a physiological evaluation. It was observed from the mapping patterns of brain waves that alpha 1 rhythm, which indicates a relaxed and concentrated state, after the sound stimulus with the frequency band of 20 Hz, showed the lowest value among the other cases. That is, the test subjects cannot keep relaxed and their concentration after hearing the sound stimulus at the frequency band of 20 Hz. The induced rate of alpha 1 rhythm almost decreased when the test subjects listened to all the sound stimuli, and further decreased with decreased frequency. Meanwhile, beta 1 rhythm, which shows a strain state, after the sound stimulus with the frequency band of 20 Hz, showed the highest value among the other cases. Therefore, the infrasound (e.g., low frequency and inaudible for human hearing) was considered to be an annoyance to the technicians who work in close proximity to a modern large-scale wind turbine.

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Location and quantification of noise sources on a wind turbine

Cited by 363 publications

References 20 publications

Reduction of Wind Turbine Noise Annoyance: An Operational Approach

Reduction of Wind Turbine Noise Annoyance: An Operational Approach

Listening Test Comparing A-Weighted and C-Weighted Sound Pressure Level as Indicator of Wind Turbine Noise Annoyance

Analysis of aerodynamic sound noise generated by a large-scaled wind turbine and its physiological evaluation

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