Abstract
Paper presents results of comparative analysis of infrasound noise generated by wind turbines of two types: asynchronous type REPOWER MM92 with power equal to 2 MW and synchronous type Vensys 62 with power equal to 1.2 MW. Frequency spectra of sound pressure levels generated during operation by both turbines for exemplary chosen wind speed values are depicted. Within the shown spectra the resonant frequencies have been indicated, for which sound pressure variations over time are shown. Based on the achieved frequency spectra it was stated that in general the asynchronous type turbine produces lower pressure levels, which are less stable over time, and indicates higher pressure values around the resonant frequencies as compared to the synchronous type turbine. Also it was stated that the asynchronous type turbine is more influenced by the wind conditions and generates higher pressure values by higher wind speeds then the synchronous type turbine. The main contribution of this paper lies in indication that the type of wind turbine generator has significant impact on the level of infrasound noise emitted to the environment.
Highlights
The problem of formation, propagation, level and possible impact of infrasound, generated by artificial sources on the natural environment and especially on living organisms, is still valid and important [1]
The results obtained due to experimental tests and measurements on real units can be referenced to the maximum allowable infrasound noise levels, which are defined in the standards related to the working environment (Regulation of the Minister of Labor and Social Policy 2002 on the maximum allowable concentrations and intensities of harmful factors at work)
The present study focuses on the measurement of the sound pressure level
Summary
The problem of formation, propagation, level and possible impact of infrasound, generated by artificial sources on the natural environment and especially on living organisms, is still valid and important [1]. This is true for wind power engineering, which infrastructure is dynamically developing in recent years in the world. The possibility of measurement and understanding the phenomena related to generation and propagation of low-frequency acoustic signals can contribute to determine the impact of sound pressure levels, emitted by wind turbines with set parameters, on the natural environment. Infrasound noise generated by modern high-power wind turbines is a problem frequently raised for opinions on their impact on the environment. If interested in other studies regarding generation of noise and vibration caused by electric power devices the reader is referenced to e.g. [20-21]
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