DIRECTION: Solve the problem below Determine the combined reverberant sound level and a direct sound level received by a person 5m away from the sound source of an air-condition unit to an enclosed room whose dimensions are: L=20m, W=13m, and H=8m with a half cylindrical ceiling. The wall is made of brick with absorption coefficient of 0.03, the ceiling is covered with suspended acoustical tile having 0.70 absorption coefficient. The floor is covered with carpet having absorption coefficient of 0.4. The window on both side has a dimension of 2m X 10m with 0.075 absorption coefficient, the floor is tiled with an absorption coefficient of 0.015. The door (1.8m X 0.7m) has an absorption coefficient of 0.01 while it is open at 75°. A canvas scenery 50m2 is hanged at the rear wall and front wall with 0.30 absorption coefficient. The seat occupied 100m2 at 0.45 absorption coefficient. Assume that the directivity factor is equal to 2. SPL=70dB
DIRECTION: Solve the problem below
Determine the combined reverberant sound level and a direct sound level received by a person 5m away from the sound source of an air-condition unit to an enclosed room whose dimensions are: L=20m, W=13m, and H=8m with a half cylindrical ceiling. The wall is made of brick with absorption coefficient of 0.03, the ceiling is covered with suspended acoustical tile having 0.70 absorption coefficient. The floor is covered with carpet having absorption coefficient of 0.4. The window on both side has a dimension of 2m X 10m with 0.075 absorption coefficient, the floor is tiled with an absorption coefficient of 0.015. The door (1.8m X 0.7m) has an absorption coefficient of 0.01 while it is open at 75°. A canvas scenery 50m2 is hanged at the rear wall and front wall with 0.30 absorption coefficient. The seat occupied 100m2 at 0.45 absorption coefficient. Assume that the directivity factor is equal to 2. SPL=70dB
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