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Title: Low frequency coupled interior sound fields due to vibrating sources on roof
Authors: Jiang, GS
An, LS
Mak, CM 
Keywords: Coupled sound fields
Exciting forces
Frequency response
Structure vibration
Issue Date: 2004
Publisher: 中國學術期刊 (光盤版) 電子雜誌社
Source: 哈爾濱工業大學學報 (Journal of Harbin Institute of Technology), 2004, v. 36, no. 3, p. 338-343 How to cite?
Journal: 哈爾濱工業大學學報 (Journal of Harbin Institute of Technology) 
Abstract: The coupled interior sound fields and its frequency response due to vibrating sources of low frequencies on the roof have been calculated by using of finite element method (FEM). The results show that there are some differences of mode frequencies between thin-walled and rigid walled of the same dimension rectangular rooms, and it is found that the difference will be larger since the mode frequency is larger. If the exciting forces frequency is near by the resonance frequency of room structure or the sound mode frequency of the room, the pressure level of coupled interior sound fields will be enhanced. When the structure resonance frequency is equal to the room's mode frequency, the sound pressure level in the room will become very high at this exciting frequency. So this case must be avoided in the engineering. The sound pressure level and the displacement on the all walls are separately calculated at the characteristic and non-characteristic frequency (80 Hz and 116 Hz). It reveals that the mostly sound energy radiated to the room is not always contributed by the roof, sometimes the other walls may be the mostly one.
ISSN: 0367-6234
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