Abstract
This paper presents an identification of the noise and vibration transmission in a building. The study includes noise measurements and noise mapping for two lecture rooms as well as vibration measurements on the floor in an office room. The results shows that the background noise level of the empty lecture rooms have exceeded the recommended limit by ANSI 12.2-2008, i.e. above 35 dB(A) due to the excessive noise radiated from the structure-borne source coming from the VAV system above the ceiling. The VAV system also transmits waves of vibration through the floor to the office on the level above causing annoying low frequency vibration. From the measured signal on the VAV, it is found that the system suffers from mechanical rotating looseness which must be solved to reduce the transmission of noise and vibration in the building.
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