| Summary: | 碩士 === 國立臺灣科技大學 === 工程技術研究所建築學程 === 88 === After being used for 10 years since its construction of performance hall of County & City Cultural Center, portion of the equipment must be updated. The literature had indicated that due to improper use of inner decoration & repairing material in many halls, which had caused bad quality in sound effect. By collecting the sound absorption material frequently used domestically and the measurement taken by laboratory shown in the literature, the study has therefore estimated and analyzed the sound absorption feature of material for the compliance of summarizing and constructing the local sound absorption coefficient data. The information collection from literature is aiming at the material for indoor decoration and modification adjunct with the feature of sound absorption and fire resistance.
The collection of literature information and the measurement taken in laboratory, both have discovered that the sound absorption material usually has been proceeded the barrier spraying or surface treatment in order to reach fire resistance effect. The barrier spraying for fire resistance has usually selected the proper barrier material to increase the sound absorption coefficient for its barrier surface treatment. The better sound barrier material shall have the feature of sound absorption with fine pin hole, the sound absorption coefficient will be increase significantly in its middle or low frequency sound absorption field followed by the thickness of material and the thickness of rear air layer. If applies the density of material in low frequency sound absorption field, then the large the density, the better the sound absorption feature. The better sound absorption feature in middle or high frequency sound absorption field can adopt 1000Kg/m3 for the reference of design.
The sound absorption feature in combination use of lining porous material of hole through metal plate is better than its individual use, but the carpet with 5mm thickness and 1.72Kg/m2, the sound absorption effect of which is bad in low frequency field. If selects the carpet with more weight in its unit area, then it may improve the sound absorption feature in low frequency field. The thickness of air layer in porous material has reached the critical value of sound absorption coefficient and has been evaluated as “A” class by Sweden National Standard, the acquisition of critical value in consideration of its economy, that can be provided for the design reference.
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