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It is well known that a large air space is needed for absorbing sound in low frequencies by using porous material. Therefore, porous material is neither realistic nor practical for use of absorbing wa...lls or ceilings in a small room such as a living room in a house. With these points as background, the authors have examined the absorbing structure in low frequencies by applying resonator absorbers and presented that the combination of three types of resonators makes good absorptions at three resonance frequencies and closing the opening of resonator with porous material of small flow resistance broadens the band width of absorbing frequencies. These results imply that resonator absorbers might realize good sound absorptions in low frequencies. In this paper, for making the thickness of the structure thin, the effects of the shape of resonators and the place of porous material in the resonators on the absorbing characteristics are examined by a numerical simulation based on FDTDM. Base on the results of the examinations, real panels are practically made, and the random incidence absorption coefficient of the panels is measured. Lastly apparent absorption coefficient of the panels is measured in an actual small meeting room.show more
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