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Long range sound propagation over a sea surface
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
2009 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 126, no 5, 2191-2197 p.Article in journal (Refereed) Published
Abstract [en]

This paper describes methodology and results from a model-based analysis of data on sound transmission from controlled sound sources at sea to a 10-km distant shore. The data consist of registrations of sound transmission loss together with concurrently collected atmospheric data at the source and receiver locations. The purpose of the analysis is to assess the accuracy of methods for transmission loss prediction in which detailed data on the local geography and atmospheric conditions are used for computation of the sound field. The results indicate that such sound propagation predictions are accurate and reproduce observed variations in the sound level as function of time in a realistic way. The results further illustrate that the atmospheric model must include a description of turbulence effects to ensure predicted noise levels to remain realistically high during periods of sound shadow. (C) 2009 Acoustical Society of America. [DOI: 10.1121/1.3238236]

Place, publisher, year, edition, pages
2009. Vol. 126, no 5, 2191-2197 p.
Keyword [en]
ATMOSPHERIC-TURBULENCE
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-13967DOI: 10.1121/1.3238236ISI: 000271507000017Scopus ID: 2-s2.0-70449346064OAI: oai:DiVA.org:kth-13967DiVA: diva2:328659
Note
QC 20100705Available from: 2010-07-05 Created: 2010-07-05 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Wind Turbine Noise and Natural Sounds: Masking, Propagation and Modeling
Open this publication in new window or tab >>Wind Turbine Noise and Natural Sounds: Masking, Propagation and Modeling
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Wind turbines are an environmentally friendly and sustainable power source. Unfortunately, the noise impact can cause deteriorated living conditions for nearby residents. The audibility of wind turbine sound is influenced by ambient sound. This thesis deals with some aspects of noise from wind turbines. Ambient sounds influence the audibility of wind turbine noise. Models for assessing two commonly occurring natural ambient sounds namely vegetation sound and sound from breaking waves are presented in paper A and B. A sound propagation algorithm has been compared to long range measurementsof sound propagation in paper C. Psycho-acoustic tests evaluating the threshold and partial loudness of wind turbine noise when mixed with natural ambient sounds have been performed. These are accounted for in paper D.

The main scientific contributions are the following.Paper A: A semi-empiric prediction model for vegetation sound is proposed. This model uses up-to-date simulations of wind profiles and turbulent wind fields to estimate sound from vegetation. The fluctuations due to turbulence are satisfactory estimated by the model. Predictions of vegetation sound also show good agreement to measured spectra.

Paper B: A set of measurements of air-borne sound from breaking waves are reported. From these measurements a prediction method of sound from breaking waves is proposed. Third octave spectra from breaking waves are shown to depend on breaker type. Satisfactory agreement between predictions and measurements has been achieved.

Paper C: Long range sound propagation over a sea surface was investigated. Measurements of sound transmission were coordinated with local meteorological measurements. A sound propagation algorithm has been compared to the measured sound transmission. Satisfactory agreement between measurements and predictions were achieved when turbulence were taken into consideration in the computations.

Paper D: The paper investigates the interaction between wind turbine noise and natural ambient noise. Two loudness models overestimate the masking from two psychoacoustic tests. The wind turbine noise is completely concealed when the ambient sound level (A-weighed) is around 10 dB higher than the wind turbine noise level. Wind turbine noise and ambient noise were presented simultaneously at the same A-weighed sound level. The subjects then perceived the loudness of the wind turbine noise as 5 dB lower than if heard alone.

Keywords: Wind turbine noise, masking, ambient noise, long range sound propagation

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. 35 p.
Series
Trita-AVE, ISSN 1651-7660 ; 19
Keyword
Wind turbine noise, models of natural sound sources, masking
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-10434 (URN)
Public defence
2009-05-26, F3, Lindstedtvägen 26, KTH, Stockholm, 10:15 (English)
Opponent
Supervisors
Note
QC 20100705Available from: 2009-05-14 Created: 2009-05-13 Last updated: 2010-07-20Bibliographically approved

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