Sound insulation characteristics of multi-layer structures with a microperforated panel

Mu, Rui; Toyoda, Masahiro; Takahashi, Daisuke

doi:10.1016/j.apacoust.2011.05.009

Cited by 43 publications

(24 citation statements)

References 8 publications

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“…15 Adding highly resistive MPPs either toward the source or the transmitting side may weaken the effects of the mass-air-mass (MAM) and half-wavelength resonances. 16 This results in a higher transmission loss (TL) around these resonances with respect to a non-perforated multi-layer structure, 17 albeit at the expense of a reduced TL out of the coincidence regions. Also, inserting MPPs inside the partition and bringing the Helmholtz frequency close to the MAM frequency may efficiently reduce the TL dip caused by the MAM resonance.…”

mentioning

confidence: 99%

Enhancing sound absorption and transmission through flexible multi-layer micro-perforated structures

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Maury

Pinhède

2013

The Journal of the Acoustical Society of America

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Theoretical and experimental results are presented into the sound absorption and transmission properties of multi-layer structures made up of thin micro-perforated panels (ML-MPPs). The objective is to improve both the absorption and insulation performances of ML-MPPs through impedance boundary optimization. A fully coupled modal formulation is introduced that predicts the effect of the structural resonances onto the normal incidence absorption coefficient and transmission loss of ML-MPPs. This model is assessed against standing wave tube measurements and simulations based on impedance translation method for two double-layer MPP configurations of relevance in building acoustics and aeronautics. Optimal impedance relationships are proposed that ensure simultaneous maximization of both the absorption and the transmission loss under normal incidence. Exhaustive optimization of the double-layer MPPs is performed to assess the absorption and/or transmission performances with respect to the impedance criterion. It is investigated how the panel volumetric resonances modify the excess dissipation that can be achieved from non-modal optimization of ML-MPPs.

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confidence: 99%

Enhancing sound absorption and transmission through flexible multi-layer micro-perforated structures

Bravo

Maury

Pinhède

2013

The Journal of the Acoustical Society of America

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“…By substituting (12) into (10) gives the total pressure on the left hand side of the surface of the panel:…”

Section: The Normal Incident Transmission Lossmentioning

confidence: 99%

“…By subdividing the air cavity in the air gap between the MPP and the back wall, it is shown that the transmission loss at mid frequencies can be improved. Most recently, Mu et al [12] present the sound insulation performance of a multilayer partition with a MPP (at the outer layer) to prevent the phenomenon of mass-air mass resonance. Similar study was also carried out by Putra et al [13], but for the case of MPP located between two solid plates.…”

Section: Introductionmentioning

confidence: 99%

Normal Incidence of Sound Transmission Loss from Perforated Plates with Micro and Macro Size Holes

Putra

Ismail

2014

Advances in Acoustics and Vibration

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This paper studies the sound transmission loss of perforated panels and investigates the effect of the hole diameter on the sound insulation performance under normal incidence of acoustic loading. The hole diameters are distinguished into micro (submillimeter) and macro (millimeter) sizes. In general, the transmission loss reduces as the perforation ratio is increased. However, by retaining the perforation ratio, it is found that the transmission loss increases as the hole diameter is reduced for a perforate with micro holes due to the effect of resistive part in the hole impedance, which is contrary to the results for those with the macro holes. Both show similar trend at high frequency where the fluid behavior inside the hole is inertial. Simple analytical formulae for engineering purpose are provided. Validation of the models with measurement data also gives good agreement.

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“…Hu et al (2012) developed a finite element model to evaluate the acoustic transmission performance of double-wall active sound packages. To increase the TL of a sandwich panel, multilayer absorbers were inserted between the double panels (Chen et al 2000;Chen 2001, 2003;Mu et al 2011). The shape effects of the periodically repeated cell on the acoustic attenuation performance have been investigated by many researchers (Kobayashi et al 2004;Lee et al 2010;Legault and Atalla 2010).…”

Section: Introductionmentioning

confidence: 99%

Optimum core design to improve noise attenuation performance and stiffness of sandwich panels used for high-speed railway vehicles

Yoon

Lee

2016

Struct Multidisc Optim

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In this study, we optimally design the core of a metal sandwich panel used in high-speed railway vehicles to minimize the amount of metal solid in the core and subsequently reduce its weight. The optimum core must satisfy constraints regarding sound transmission class (STC) and compliance. Because the solid-void layout in the core strongly affects the acoustic and static characteristics of sandwich panels, the core layout should be carefully designed when reducing the amount of metal solid. To this end, three topology-optimization problems and one size-optimization problem are formulated and sequentially solved. A single unit cell is periodically repeated in the core. Thus, structural and acoustic topology-optimization problems are first formulated and solved for the unit cell. Based on the optimal topologies obtained for the unit cell, a moderate initial solid-void layout in the unit cell is determined for the size-optimization problem to optimally design core. The effectiveness of the current design approach for the core of the sandwich panel is validated by comparing the STC and compliance values of the optimal core design and a reference design. Nomenclature A N n¼1 finite element assembly operator Bmatrix relating the element strain vector to its nodal displacement vector C m e a nc o m p l i a n c e C ini initial mean compliance c speed of sound in air D constitutive matrix d 1 thickness of thin flat plates at both ends in a sandwich panel d 2 thickness of the bar inside a sandwich panel dis (r,m) distance between the centers of the r th and m th elements E r (χ r ) Young's modulus of the r th element

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Sound insulation characteristics of multi-layer structures with a microperforated panel

Cited by 43 publications

References 8 publications

Enhancing sound absorption and transmission through flexible multi-layer micro-perforated structures

Enhancing sound absorption and transmission through flexible multi-layer micro-perforated structures

Normal Incidence of Sound Transmission Loss from Perforated Plates with Micro and Macro Size Holes

Optimum core design to improve noise attenuation performance and stiffness of sandwich panels used for high-speed railway vehicles

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