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    The Measurement of Infrasound and Low Frequency Noise for Wind Farms (English)

    In: Wind Turbine Noise 2013, WTN, International Conference on Wind Turbine Noise, 5 ; 33-47  ; 2013

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    The use of dB(A) for the assessment of large industrial wind turbines does not address low frequency noise (LFN) or infrasound due to the filter characteristics of the A-weighting curve. In seeking to address infrasound noise (typically identified as between 1 Hz and 20Hz) some acousticians for the wind industry have used dB(G) and dB(Z) results. Both of these weighting curves exhibit significant roll offs in the frequency domain below 6Hz that renders the use of such descriptors of no real value in addressing infrasound of wind turbine noise. In my opinion the correct procedure is to use Linear (unweighted) levels in both constant percentage 1/3 octave bands (to agree with current acoustical data) and narrow band analysis to identify the wind turbine signature. For infrasound noise it would appear consideration of the linear result over the bandwidth of 1 Hz - 20 Hz is appropriate and low frequency noise when considered as a separate exercise should be expressed i as a linear level restricted to the bandwidth of 20 - 200 Hz.

    Table of contents conference proceedings

    The tables of contents are generated automatically and are based on the data records of the individual contributions available in the index of the TIB portal. The display of the Tables of Contents may therefore be incomplete.

    1
    Infrasound Measurement, Interpretation and Misinterpretation
    Walker, Bruce et al. | 2013
    33
    The Measurement of Infrasound and Low Frequency Noise for Wind Farms
    Cooper, Steven et al. | 2013
    85
    Perception of low frequency components contained in wind turbine noise
    Yokoyama, Sakae / Sakamoto, Shinichi / Tachibana, Hideki et al. | 2013
    108
    Audible amplitude modulation - results of field measurements and investigations compared to psychoacoustical assessment and theoretical research
    Stigwood, Mike / Large, Sarah / Stigwood, Duncan et al. | 2013
    166
    Application of Phased Array Techniques for Amplitude Modulation Mitigation
    Buck, Steven / Palo, Scott / Moriarty, Patrick et al. | 2013
    176
    Evaluation of Secondary Windshield Designs for Outdoor Measurement of Low Frequency Noise and Infrasound
    Hansen, Kristy / Zajamsek, Branko / Hansen, Colin et al. | 2013
    267
    Hybrid Methods for Noise Prediction in Aeroacoustic Simulations of Small Vertical Axis Wind Turbines
    Weber, Johannes / Becker, Stefan / Scheit, Christoph / Kaltenbacher, Manfred et al. | 2013
    291
    The effect on noise emission from a wind turbine due to ice accretion on rotor blades
    Arbinge, Peter / Appelqvist, Paul et al. | 2013
    322
    Noise from one stage of helical gears by wind turbine load
    Park, Chan-Il et al. | 2013
    330
    A validated virtual prototyping approach for avoiding wind turbine tonality
    Sonja, Goris / Ribbentrop, Alexander / Markiewicz, Marian / Wartzack, Sandro / Desmet, Wim et al. | 2013
    359
    Noise Source Localization On A 8kW Wind Turbine Using A Compact Microphone Array With Advanced Beamforming Algorithms
    Ramachandran, Rakesh Chandran / Patel, Hirenkumar / Jiang, Yong / Shi, Xiaodong / Krishnamurth, Mahesh / Raman, Ganesh et al. | 2013
    694
    Environmental noise assessment of proposed wind farms using annual average Ldn
    Bliss, Mark et al. | 2013
    702
    Accuracy of noise predictions for wind farms
    Cooper, Jonathan / Evans, Tom et al. | 2013

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