Comparisons of semi-porous fabric domes and cylindrical wind fence enclosures for infrasonic wind noise reduction

Abstract

This investigation compares the measured wind noise of two types of infrasonic wind noise reduction barriers. The first type is a set of 2.0 m diameter semi-porous fabric domes constructed and tested by the Army Research Laboratory [J. Acoust. Soc. Am. 136, 2139 (2014)]. The type second is a set of single and multi-layer cylindrically shaped variable-porous wind fence enclosures measuring 5.0 m and 10.0 m, constructed and tested by the National Center for Physical Acoustics [J. Acoust. Soc. Am. 134, 4161 (2013)]. Preliminary investigations showed that for wind speeds between 3—6 m/s the measured power spectra densities of the fabric domes were comparable to the measured power spectra densities of the single layer, 5.0 m diameter wind fence enclosures at mid-range porosities. The measured power spectra densities of the fabric domes were higher than the measured power spectra densities for the 10.0 m diameter and multi-layer wind fences enclosures. For wind speeds greater than 6 m/s, the measured wind noise for the fabric domes was comparable to or lower than the measured wind noise for the wind fence enclosures.