Development and Testing of Cabin Sidewall Acoustic Resonators for the Reduction of Cabin Tone Levels in Propfan-Powered Aircraft

Kuntz, H. L.; Gatineau, R. J.; Prydz, R. A.; Balena, F. J.

doi:10.3397/1.2827801

Cited by 13 publications

(10 citation statements)

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“…For extreme values of r, (r→0 and r→1), the behavior of the patchwork is fully governed by one of the two elements. However, for intermediary values of r, the asymptotic behavior of equations (10) and (11) can be analyzed to better understand the influence of the HR. Two different configurations are presented in Fig.7 to illustrate the influence of the HR tuning frequency f 0 when a HR is placed in a highly absorbing media (see properties in Table 2).…”

Section: Rigid Hr In Foammentioning

confidence: 99%

“…Selamet [6] studied the influence of the neck shape of the resonator and observed that this had an influence on resonance frequency and transmission loss behavior. A large amount of research is related to the wide use of HRs in a variety of technical applications in different fields of industry [7][8][9][10]. For aerospace application, a system used to protect the payloads against noise emission of expandable launch vehicles was proposed by [11].…”

Section: Introductionmentioning

confidence: 99%

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Numerical and experimental investigations on the acoustic performances of membraned Helmholtz resonators embedded in a porous matrix

Abbad

Atalla

Ouisse

et al. 2019

Journal of Sound and Vibration

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Acoustic performances of two concepts based on the integration of an elastic membrane in the front wall of a cavity and Helmholtz resonator embedded in a melamine matrix are studied. Membranes are made of acrylic material, this latter is first characterized with a uniaxial test in order to extract the mechanical properties needed to model the membrane. Analytical, numerical and experimental investigations are performed so as to determine the acoustical potential of the proposed systems in terms of absorption and transmission loss. The contribution to the sound absorption can be positive or negative at the resonator resonances, an analytical model is proposed to highlight the physical phenomena related to these effects. In addition, a multiphysics numerical model combining the acoustic-mechanical interaction has been developed and validated by comparison with the experimental data measured using an impedance tube. The studied concepts could offer significant enhancements of sound transmission loss properties in the low frequencies but also on acoustic absorption in specific frequency bands.

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Section: Rigid Hr In Foammentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical and experimental investigations on the acoustic performances of membraned Helmholtz resonators embedded in a porous matrix

Abbad

Atalla

Ouisse

et al. 2019

Journal of Sound and Vibration

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“…To reduce the transmission of acoustic noise, conventional Helmholtz resonators (HRs) with rigid cavity walls have been widely used as acoustic dampers in aircraft cabins [1][2][3]. Their damping mechanism is primarily due to thermo-viscous and vortex shedding losses [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Transmission Loss Analysis of a Parallel-Coupled Helmholtz Resonator Network with a Green's Function Approach

Zhao

2011

17th AIAA/CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference)

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To reduce the transmission of multiple tones or broadband noise, Helmholtz resonators with a narrow frequency bandwidth are typically used in aircraft cabins. However, the space available for applying such resonators is limited. To effectively use the space and to increase transmission loss (TL), a parallel-coupled Helmholtz resonator network, with two resonators connected via a thin compliant membrane, was designed and experimentally tested. It was found that the compliant membrane motion plays an important role in the production of additional TL peaks. A numerical model of a parallel-coupled resonator network was then developed to simulate the experiments. The rate of cavities volume change due to the presence of the compliant membrane is described in detail with the aid of the appropriate motion equation of the membrane by using Green's function approach. Good agreement between the numerical and experimental results is found. Furthermore, insight into the effect of membrane mechanical properties on the production of TL peaks was provided by the numerical model. Finally, to broaden the effective frequency range of the resonator network, the membrane vibration is actively controlled by implementing a trust-region Newton conjugate-gradient method. Transmission loss is found to increase to approximately 25 dB over a broad frequency range.

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“…According to the authors of Ref. 3, their idea stems from the works of Mason and Fahy, 4 Prydz et al, 5 and Kuntz et al, 6 where the HRs where attached directly on the panel. Sugie et al 3 suggested that including the resonant element within the fibrous sound package in between the two panels allows for a more flexible optimization of the HR effect and a low frequency sound insulation improvement.…”

Section: Haisam Osmanmentioning

confidence: 99%

Transfer matrix modeling and experimental validation of cellular porous material with resonant inclusions

Doutres

Atalla

Osman

2015

The Journal of the Acoustical Society of America

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Porous materials are widely used for improving sound absorption and sound transmission loss of vibrating structures. However, their efficiency is limited to medium and high frequencies of sound. A solution for improving their low frequency behavior while keeping an acceptable thickness is to embed resonant structures such as Helmholtz resonators (HRs). This work investigates the absorption and transmission acoustic performances of a cellular porous material with a two-dimensional periodic arrangement of HR inclusions. A low frequency model of a resonant periodic unit cell based on the parallel transfer matrix method is presented. The model is validated by comparison with impedance tube measurements and simulations based on both the finite element method and a homogenization based model. At the HR resonance frequency (i) the transmission loss is greatly improved and (ii) the sound absorption of the foam can be either decreased or improved depending on the HR tuning frequency and on the thickness and properties of the host foam. Finally, the diffuse field sound absorption and diffuse field sound transmission loss performance of a 2.6 m 2 resonant cellular material are measured. It is shown that the improvements observed at the Helmholtz resonant frequency on a single cell are confirmed at a larger scale.

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Development and Testing of Cabin Sidewall Acoustic Resonators for the Reduction of Cabin Tone Levels in Propfan-Powered Aircraft

Cited by 13 publications

References 0 publications

Numerical and experimental investigations on the acoustic performances of membraned Helmholtz resonators embedded in a porous matrix

Numerical and experimental investigations on the acoustic performances of membraned Helmholtz resonators embedded in a porous matrix

Transmission Loss Analysis of a Parallel-Coupled Helmholtz Resonator Network with a Green's Function Approach

Transfer matrix modeling and experimental validation of cellular porous material with resonant inclusions

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