2008
DOI: 10.1299/jee.3.13
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Sound Attenuation by a Resonant Effect of a Rectangular Box Containing a Cylinder as a Model of a Ceiling-Mounted Ventilator

Abstract: A typical ceiling-mounted ventilator consists of a cylindrical fan unit and a rectangular box as an outer cover. When the box is appropriately closed by an orifice plate in front of the fan, the space enclosed by the box and plate acts as a sound resonator. In the present study, the performance and physical aspect of this resonator are investigated experimentally using a model of a rectangular chamber containing an internal cylinder placed in an infinite circular duct. The sound transmission loss of the chambe… Show more

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Cited by 2 publications
(7 citation statements)
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“…Such a large variation was not experienced in our earlier research using the other types of separator: a circular plate or a cylindrical pipe in domain I (2) . In addition, it is also remarkable that the peak of each resonance maintains the same level of that of the without-separator case.…”
Section: Sound Attenuation Effect (Frequency Response)contrasting
confidence: 53%
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“…Such a large variation was not experienced in our earlier research using the other types of separator: a circular plate or a cylindrical pipe in domain I (2) . In addition, it is also remarkable that the peak of each resonance maintains the same level of that of the without-separator case.…”
Section: Sound Attenuation Effect (Frequency Response)contrasting
confidence: 53%
“…1), a space is formed as a combination of domains I and II. In our previous research (2) , the shape of this space was simplified axisymmetrically to obtain a basic understanding of the resonance in the space: the outer cover is replaced by a rectangular open box with a square cross-section; the fan casing is replaced by an inner cylinder; and the orifice plate is replaced by a side wall with a pipe inserted into it. In this research, the boundary between domains I and II is partially shut using a plate or plates called a "separator," as shown in Fig.…”
Section: Model Of Chambermentioning
confidence: 99%
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“…The basic property of the space surrounded by the orifice plate and the outer cover was clarified previously using an experimental model that consists of an infinite duct with a chamber having a simplified version of the space under consideration (2) . Based on the characteristic shape of the chamber, the chamber can be separated into two domains using a plate that partially closes off the intermediate area of the chamber.…”
Section: Introductionmentioning
confidence: 99%