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speaker system (TS-12S) was positioned in one of the class- rooms at a height of 1.5 m above the floor and a broadband noise was radiated. At the receiving points, omnidirectional microphones were positioned at a height of 1.2 m above the floor. From the measurement results, the sound pressure level (L p) in the octave band centered at 500 Hz was obtained and normalized by assuming that the sound power level of the sound source in the band was 100 dB. The above-mentioned numerical analysis was performed using the same classroom dimensions and measurement points. Table 1 lists the finishing materials of the surfaces in the classrooms and the sound absorption coefficient assumed in the numerical analysis. The spatial distribution of L pE obtained by the numerical analysis and that of L p obtained by the measurement are in fairly good agreement, as shown in Fig. 2. Thus, the numer- ical analysis method used in this study is confirmed to be useful for examining the sound transmission characteristics of open-plan type classrooms.

Study on sound transmission between open-type classrooms by numerical analysis