Attenuation Characteristics of Double Orifice Silencer Jointed by Permeable Membrane (Measurement and Theoretical Analysis of Sound Transmission Loss)

Sakamoto, Shuichi; Miyairi, Toru; Hoshino, Akira; Kourakata, Itaru; Satō, Takashi

doi:10.1299/kikaic.79.3474

Cited by 2 publications

(3 citation statements)

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“…8. Through the back air space effect of the nonwoven fabric [9] as shown in Fig. 10, sound attenuation increased in comparison with that achieved with the basic silencer in a wide frequency range of 1000-3000 Hz.…”

Section: Attachment Of Sheets Of Nonwoven Fabricmentioning

confidence: 94%

“…We calculated the attenuating peak frequency of the throttle effect by the tail pipe as both ends opened using (8). Here, we calculated the open-end correction length using E = 0.4 for orifice [11] through (9). (8) (9) According to (9), open-end correction length for both ends is 16 mm.…”

Section: Addition Of a Tail Pipe To The Openingmentioning

confidence: 99%

“…Here, we calculated the open-end correction length using E = 0.4 for orifice [11] through (9). (8) (9) According to (9), open-end correction length for both ends is 16 mm. Therefore, the length of an effective tail pipe (l t + ∆l 1 + ∆l 2 in (8)) can be estimated from this total to be 82 mm.…”

Section: Addition Of a Tail Pipe To The Openingmentioning

confidence: 99%

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Sound Attenuation Devices for Dogs Barking (Estimation of Aperture Ratio and Experimental Study of Silencer)

Sakamoto

Toyoshima²,

Murayama³

et al. 2014

IJMEA

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This paper reports a natural ventilation silencer for an animal cage having considerable sound insertion loss.Many veterinary hospitals face a serious problem that hospitalized animals are stressed from the barks of other dogs in the hospital. To address this problem, a solution that barely affects caged dogs' health is required. First, we estimated aperture ratio of the silencer device which was considered by physiological sustainability of dog. Next, we attempted to use a silencer with sound insertion loss by attaching it to an opening side of the cage. We constructed the tested prototype silencers by using the resonance of a rectangular room and a nonwoven fabric. We measured the acoustic characteristics of the silencers that were attached to the real scale model of the animal cage. We also measured their insertion loss by considering the estimated frequency characteristics of the dogs' barking sound. The result shows that proposed silencers have more than 10 dB insertion loss; therefore, they can maintain respiratory environment of a caged dogs along with good visibility.

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Section: Attachment Of Sheets Of Nonwoven Fabricmentioning

confidence: 94%