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Research Papers: Alternative Energy Sources

Assessment of the Noise Generated by Wind Turbines at Low Frequencies

[+] Author and Article Information
Martino Marini

DADU,
University of Sassari,
Palazzo Pou Salit,
Alghero 07041, SS, Italy
e-mail: marini@uniss.it

Roberto Baccoli

DICAAR,
University of Cagliari,
Via Marengo 2,
Cagliari 09100, Italy
e-mail: rbaccoli@unica.it

Costantino C. Mastino

DICAAR,
University of Cagliari,
Via Marengo 2,
Cagliari 09100, Italy
e-mail: mastino@fisicatecnica-unica.it

Antonino Di Bella

DII,
University of Padova,
Via Venezia 1,
Padova 35131, Italy
e-mail: antonino.dibella@unipd.it

Carlo Bernardini

G.F.T.A (Technical Physics Association),
via G. Zurita 13,
Cagliari 09125, Italy
e-mail: bernardinicarlo@tin.it

Massimiliano Masullo

DADI,
Università degli Studi della Campania “Luigi Vanvitelli”,
Abbazia di San Lorenzo ad Septimum,
via S. Lorenzo,
Aversa 81031, CE, Italy
e-mail: massimiliano.masullo@unicampania.it

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received October 3, 2016; final manuscript received January 27, 2017; published online July 18, 2017. Assoc. Editor: Ryo Amano.

J. Energy Resour. Technol 139(5), 051215 (Jul 18, 2017) (11 pages) Paper No: JERT-16-1395; doi: 10.1115/1.4037088 History: Received October 03, 2016; Revised January 27, 2017

The noise production from wind turbines (WT) and its propagation into the surrounding environment have an impact on the receptors (RC) that have to be accurately predicted within the environmental impact assessment. The low-frequency noise (LFN) is of special concern for it is typical of wind systems and it involves specific computational issues. The purpose of this study is to apply and compare the assessment procedures currently used in different European countries for the prediction of LFN produced by wind turbines, with reference to a specific case. The results of the calculations for a planned wind farm in northern Sardinia, Italy, obtained by the available computational tools and with the help of the presented predictive models are presented and discussed. It can be deduced from this that the impact due to the low frequencies noise generated by wind turbines in the vicinity of sensitive receptors is negligible in terms of generated sound pressure levels (SPLs), even though further investigations on such a topic are needed.

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Figures

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Fig. 1

Hearing thresholds for low frequencies (source: Annex 9 of guide to exposure to infrasounds, ISPESL 2005)

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Fig. 2

Normalized curves of equal loudness level (source: Annex A—UNI ISO 226-2007)

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Fig. 3

Sound power level emitted Lw(A) for the frequency range 10 Hz to 10 kHz by WECSs type V112 for different wind speeds

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Fig. 4

Lw,eq(A) in the infra sound frequency range (10–160 Hz) and for the range (10 Hz to 20 kHz) for different wind speeds

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Fig. 5

Geometric scheme for calculation

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Fig. 6

Danish “standard” coefficients

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Fig. 7

Area of the wind farm and receptors

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Fig. 8

Map of the wind farm site and calculated pressure levels after ISO 9613

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Fig. 9

Cumulative sound pressure levels for all the receptors according to Danish model

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Fig. 10

Cumulative sound pressure levels for all the receptors according to ISO 9613

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