A chart for estimating the distance attenuation of flanking sound passing through open windows in the exterior wall of adjoining rooms and its experimental verification

Sound transmission between adjoining rooms is often influenced by a flanking sound passing through open windows placed in the exterior wall of the two rooms. It is important to predict such flanking sound propagation when considering the sound insulation between the adjoining rooms. In this paper, a chart for estimating the distance attenuation of the flanking sound, which is obtained from analysis using the boundary integral equation method, is first provided. Next, 1:10 scale model experiments are carried out. The experimental results are in good agreement with the chart, the effectiveness of the chart thus being verified.