Abstract
In the ISO 16283 series for field measurement of sound insulation, a low-frequency procedure is specified for determining indoor average sound pressure level, which is the so-called corner method. In the procedure, additional measurements are required in the corners in addition to the default measurements in the central zone, and the indoor average level is corrected with the highest level in the corners. However, this procedure was empirically proposed, and its validity is not fully examined for façade sound insulation. In this paper, detailed experiments were performed in a mock lightweight wooden house for validating the low-frequency procedure for façade sound insulation measurement. The results suggest that a correction with energy-averaging level of all corners is more reliable than with the maximum level, and the uncertainty in the default procedure is sufficiently improved with additional measurements in four non-adjacent corners. Moreover, the effect of the detailed position of the microphone around the corner was clarified for a more specific instruction.
Highlights
In Japan, there have been gradually increasing residents’ complaints about lowfrequency noise, from industrial facilities and from household heat pumps for air conditioning and water heaters [1,2,3]
The measurements of airborne sound insulation of buildings and their elements are normally performed above 100 Hz, regardless of laboratory and field measurements, according to the methods specified by ISO or national standards
In the conventional measurements of airborne sound insulation, indoor average sound pressure level is usually determined with five microphone positions in the central zone of the room, which could lead to adverse significant deviation at low frequencies due to low-order normal modes
Summary
In Japan, there have been gradually increasing residents’ complaints about lowfrequency noise, from industrial facilities and from household heat pumps for air conditioning and water heaters [1,2,3]. The ISO 16283 series were published for field measurements of sound insulation, where a low-frequency procedure has been specified for determining the indoor average sound pressure level [10,11], based on the intensive study by Hopkins and Turner [12]. In the ISO series, the low-frequency procedure is applied for the 50 Hz, 63 Hz, and 80 Hz one-third octave bands, and for rooms with a volume of smaller than 25 m3 This procedure was empirically proposed, and its validity is not fully examined for various cases measurements of insulation between rooms were intensively carried out [12,13,14,15]. We have recently performed a 1/4-scale model measurement using a small house model installed in a semi-anechoic chamber [7], and the low-frequency procedure was roughly validated using the measured sound pressure levels at multiple grid points [16]
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