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Sound absorption coefficient measuring device, the sound absorption coefficient measuring method and a sound absorption rate measurement program
Sound absorption coefficient measuring device, the sound absorption coefficient measuring method and a sound absorption rate measurement program
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机译：吸声系数测量装置，吸声系数测量方法和吸声率测量程序
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摘要
PROBLEM TO BE SOLVED: To obtain acoustic absorptivity capable of suppressing the influence of acoustic energy flowing from a periphery of a sound absorber.;SOLUTION: An acoustic absorptivity measurement method includes the steps of: calculating acoustic intensity Ie from measurement results of acoustic intensity level LIe at a plurality of portions on a sound absorber 1; and calculating acoustic powers P1 and P2 of a room both when the room is vacant and when the sound absorber is installed therein, from measurement results of acoustic pressure levels Lp in a reverberation room 10 both when the room is vacant and when the sound absorber is installed therein to calculate, from a difference between the measurements, an acoustic power Pa that is absorbed by the whole sound absorber. The acoustic absorptivity measurement method further includes the steps of: calculating acoustic energy Ee that flows from the periphery of the sound absorber, from the acoustic intensity Ie; acquiring an acoustic power Pc in which an influence of acoustic energy flowing from the periphery of the sound absorber is eliminated by subtracting acoustic energy Ee from the acoustic power Pa; acquiring equivalent sound-absorbing area Ac in which an influence of acoustic energy flowing from the periphery of the sound absorber is eliminated, from the acoustic power Pc and equivalent sound-absorbing area A of the whole sound absorber; and dividing the equivalent sound-absorbing area Ac by a sample area S to acquire acoustic absorptivity αc in which an influence of acoustic energy flowing from the periphery of the sound absorber is eliminated.;COPYRIGHT: (C)2013,JPO&INPIT
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