The influence of periodic wind turbine noise on infrasound array measurements

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• 作者：Christoph Pilger ; ^{christoph.pilger@bgr.de" class="auth_mail" title="E-mail the corresponding author} ; Lars Ceranna ^{lars.ceranna@bgr.de" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Infrasound ; Wind turbine ; Aerodynamic noise ; Blade passing harmonics ; CTBT
• 刊名：Journal of Sound and Vibration
• 出版年：2017
• 出版时间：3 February 2017
• 年：2017
• 卷：388
• 期：Complete
• 页码：188-200
• 全文大小：5572 K

文摘

Aerodynamic noise emissions from the continuously growing number of wind turbines in Germany are creating increasing problems for infrasound recording systems. These systems are equipped with highly sensitive micro pressure sensors accurately measuring acoustic signals in a frequency range inaudible to the human ear. Ten years of data (2006–2015) from the infrasound array IGADE in Northern Germany are analysed to quantify the influence of wind turbine noise on infrasound recordings. Furthermore, a theoretical model is derived and validated by a field experiment with mobile micro-barometer stations. Fieldwork was carried out 2004 to measure the infrasonic pressure level of a single horizontal-axis wind turbine and to extrapolate the sound effect for a larger number of nearby wind turbines. The model estimates the generated sound pressure level of wind turbines and thus enables for specifying the minimum allowable distance between wind turbines and infrasound stations for undisturbed recording.

This aspect is particularly important to guarantee the monitoring performance of the German infrasound stations I26DE in the Bavarian Forest and I27DE in Antarctica. These stations are part of the International Monitoring System (IMS) verifying compliance with the Comprehensive Nuclear-Test-Ban Treaty (CTBT), and thus have to meet stringent specifications with respect to infrasonic background noise.