Effect of acoustical damping with a porous absorptive layer in the cavity to reduce the structure-borne sound radiation from a double-leaf structure

Yairi, Motoki; Sakagami, Kimihiro; Morimoto, Masayuki; Minemura, Atsuo; Andow, Kei

doi:10.1016/s0003-682x(02)00120-2

Cited by 14 publications

(8 citation statements)

References 11 publications

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“…The coincidence effect of walls and the mass-air-mass resonance of double-leaf structures are not unique phenomena for airborne sound transmission. 11,12…”

Section: A Backgroundmentioning

confidence: 99%

Relationship between sound radiation from sound-induced and force-excited vibration: Analysis using an infinite elastic plate model

Yairi

Sakagami

Nishibara

et al. 2016

The Journal of the Acoustical Society of America

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Although sound radiation from sound-induced vibration and from force-excited vibration of solid structures are similar phenomena in terms of radiating from vibrating structures, the general relationship between them has not been explicitly studied to date. In particular, airborne sound transmission through walls and sound radiation from structurally vibrating surfaces in buildings are treated as different issues in architectural acoustics. In this paper, a fundamental relationship is elucidated through the use of a simple model. The transmission coefficient for random-incidence sound and the radiated sound power under point force excitation of an infinite elastic plate are both analyzed. Exact and approximate solutions are derived for the two problems, and the relationship between them is theoretically discussed. A conversion function that relates the transmission coefficient and radiated sound power is obtained in a simple closed form through the approximate solutions. The exact solutions are also related by the same conversion function. It is composed of the specific impedance and the wavenumber, and is independent of any elastic plate parameters. The sound radiation due to random-incidence sound and point force excitation are similar phenomena, and the only difference is the gradient of those characteristics with respect to the frequency.

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“…The coincidence effect of walls and the mass-air-mass resonance of double-leaf structures are not unique phenomena for airborne sound transmission. 11,12…”

Section: A Backgroundmentioning

confidence: 99%

Relationship between sound radiation from sound-induced and force-excited vibration: Analysis using an infinite elastic plate model

Yairi

Sakagami

Nishibara

et al. 2016

The Journal of the Acoustical Society of America

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“…These different models have also been used to optimize the effect of the porous layer and increase the transmission loss performance of the double panel structure. The optimization was mainly based on the blanket configuration, 7,[10][11][12] i.e., thickness, position and boundary conditions, or on the properties of the porous layer such as static airflow resistivity or bulk density. 3,7,11 Even though these aforementioned models allow one to predict quite accurately the effect of a blanket on the sound transmission loss of the double panel structure, it remains unclear what acoustical properties the absorbing blanket should own to optimize the sound transmission loss of the double panel structure.…”

Section: ͑1͒mentioning

confidence: 99%

“…The optimization was mainly based on the blanket configuration, 7,[10][11][12] i.e., thickness, position and boundary conditions, or on the properties of the porous layer such as static airflow resistivity or bulk density. 3,7,11 Even though these aforementioned models allow one to predict quite accurately the effect of a blanket on the sound transmission loss of the double panel structure, it remains unclear what acoustical properties the absorbing blanket should own to optimize the sound transmission loss of the double panel structure. Indeed, considering an unbounded blanket inside the cavity, this layer will dissipate acoustical energy by means of two main contributions: sound absorption in the air-gaps separating the blanket from the panels and sound transmission loss through the blanket.…”

Section: ͑1͒mentioning

confidence: 99%

Acoustic contributions of a sound absorbing blanket placed in a double panel structure: Absorption versus transmission

Doutres

Atalla

2010

The Journal of the Acoustical Society of America

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The objective of this paper is to propose a simple tool to estimate the absorption vs. transmission loss contributions of a multilayered blanket unbounded in a double panel structure and thus guide its optimization. The normal incidence airborne sound transmission loss of the double panel structure, without structure-borne connections, is written in terms of three main contributions; ͑i͒ sound transmission loss of the panels, ͑ii͒ sound transmission loss of the blanket and ͑iii͒ sound absorption due to multiple reflections inside the cavity. The method is applied to four different blankets frequently used in automotive and aeronautic applications: a non-symmetric multilayer made of a screen in sandwich between two porous layers and three symmetric porous layers having different pore geometries. It is shown that the absorption behavior of the blanket controls the acoustic behavior of the treatment at low and medium frequencies and its transmission loss at high frequencies. Acoustic treatment having poor sound absorption behavior can affect the performance of the double panel structure.

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“…Double-leaf structures are also suitable for the reduction of sound radiation from these types of force-excited vibration. To reduce the force-excited sound radiation from a doubleleaf structure, practical methods using porous layers in the cavity [8] and perforated board in combination with honeycomb layer systems [9] have been theoretically studied. Floor impact sound problems, such as footfall, are another typical source of force-excited sound radiation.…”

Section: Introductionmentioning

confidence: 99%

Relationship between sound radiations resulting from airborne-sound and point-force excitations of a double-leaf infinite elastic plate

Yairi

Sakagami

Okuzono

2019

Acoust. Sci. & Tech.

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This paper presents an expanded theory for relating airborne-sound-excited and forceexcited sound radiations from solid structures. Although the reduction of these two types of sound radiation is a fundamental issue in noise-control engineering, each of them has been historically treated as a separate issue. The reduction in the former is normally called airborne sound insulation and separated from the latter, especially in architectural acoustics. A previous study (M. Yairi et al., J. Acoust. Soc. Am., 140, 453-460 (2016)) established a fundamental relationship between the sound radiations from random-incidence sound-excited and point-force-excited vibrations of a single-leaf infinite elastic plate. A conversion function that relates the two excitation cases was presented in a simple closed form, not including the parameters of the plates, which included of only the specific impedance and the acoustic wavenumber of the medium surrounding the plate. In this paper, the applicability of the conversion function is expanded from a single-leaf infinite elastic plate model to a double-leaf infinite elastic plate model. The sound radiation from a double-leaf infinite elastic plate driven by random-incidence sound and that driven by point-force excitation are theoretically investigated. The conversion function derived from the present model successfully relates the two excitation problems at all analyzed frequencies and has been shown to agree with the previously established single-leaf theory.

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Effect of acoustical damping with a porous absorptive layer in the cavity to reduce the structure-borne sound radiation from a double-leaf structure

Cited by 14 publications

References 11 publications

Relationship between sound radiation from sound-induced and force-excited vibration: Analysis using an infinite elastic plate model

Relationship between sound radiation from sound-induced and force-excited vibration: Analysis using an infinite elastic plate model

Acoustic contributions of a sound absorbing blanket placed in a double panel structure: Absorption versus transmission

Relationship between sound radiations resulting from airborne-sound and point-force excitations of a double-leaf infinite elastic plate

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