Model study of reverberations in building

Pao Yue-kong Library Electronic Theses Database

Model study of reverberations in building


Author: Yau, Wing-hong
Title: Model study of reverberations in building
Degree: M.Sc.
Year: 1997
Subject: Sound -- Transmission
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: v, 54, [69] leaves : ill. (some col.) ; 30 cm
Language: English
Abstract: The objectives of this dissertation are to evaluate the accuracy and applicability of modelling techniques for predicting the reverberation time of a classroom. A 1:10 scale model was studied in the School of Architecture, Tsinghwa University, China. In the model study, each of the sound decay curve was recorded by two different methods, i.e. by using a tape recorder and by a computer program. Reverberation time predicted by Sabine's formula and Eyring's formulas and the reverberation time measured in the real classroom are also developed for comparison with the results of the model. The reverberation time obtained by the modelling method (especially the results recorded by the tape recorder) generally agreed with the measured results in the classroom. The error existed in the reverberation time recording by the computer program was attributed by the low sampling rate in the computer program. In the comparison, the less accurate reverberation time prediction method are the Sabine's and Eyring's formulas. Both formulas have shown inaccuracy in low and high testing frequencies. This concluded that the modelling technique is a useful tool to predict the reverberation time of room. It is recommended that a complete set of similar acoustical modelling equipment and procedures are to be set up in the Hong Kong Polytechnic University. This set up is useful for assessment of both reverberation time of an enclosure and the sound absorption characteristic of newly invented building material in future.

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