Tunneling effect in sound transmission loss determination: Theoretical approach

Kim, Bong-Ki; Kang, Hyunju; Kim, Jae‐Seung; Kim, Hyun‐Sil; Kim, Sang-Ryul

doi:10.1121/1.1698815

Cited by 16 publications

(23 citation statements)

References 15 publications

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“…Regardless of the niche type, it is seen that negative differences become greater below 800 Hz as the niche depth increases, whereas positive and negative differences appear above 1 kHz in relation to the wavelength. The tendency at low frequencies is consistent with the previous experimental results and the theoretical explanations by Vinokur [11] and Kim et al [10]. Regarding the recessing niche, the variations of the STL difference reasonably well correspond with those for a larger glass pane in [12].…”

Section: Calculation Of Stlsupporting

confidence: 91%

“…Some decades ago, several experimental studies demonstrated the niche effect [5][6][7][8][9], which was later investigated in theoretical and numerical studies [10][11][12][13]. So far, the following general findings on the niche effect have been obtained: 1) the effect is significant below the critical coincidence frequency; 2) the effect depends on the position of the specimen in the niche; 3) the lowest STL is obtained when the sample is located in the middle of the niche; 4) the highest STL is obtained when the sample is mounted flush at one of the edges of the niche; 5) the effect depends on the sectional shape of the niche around the specimen.…”

Section: Introductionmentioning

confidence: 99%

“…However, this model is only valid for a low-frequency range below c 0 =S, where c 0 is the speed of sound and S is the aperture area. Secondly, Kim et al suggested that the acoustic field inside the niche modifies the vibration field of a plate, which increases the radiation efficiency at resonances [10]. This modal cou-pling effect can explain the decrease in STL in the intermediate frequency range below the critical frequency.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical examination of niche effect on sound transmission loss of glass panes

Sakuma

Inoue

Seike

2017

Acoust. Sci. & Tech.

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In the laboratory measurement of the sound transmission loss of platelike building elements, a specimen mounted between coupled rooms causes the so-called niche effect. Normally a specimen is mounted inside an aperture in a thick wall, whereas in a special case where a specimen is mounted flush with the wall, a projecting box frame is additionally installed outside the opening. Firstly, the measurements of a glass pane with the two types of niche are numerically modeled by vibro-acoustic simulation, and the niche effect is examined while changing the niche depth and specimen position. As a result, it is revealed that the effect of the projecting niche is generally smaller than that of the recessing niche. Secondly, regarding the cross-sectional shape of the recessing niche, the smaller effect of the staggered niche specified in ISO 10140 is validated by comparison with that of a flat niche. Additionally, the incidence angle dependence of the niche effect is clarified.

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Section: Calculation Of Stlsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical examination of niche effect on sound transmission loss of glass panes

Sakuma

Inoue

Seike

2017

Acoust. Sci. & Tech.

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“…For finitely bounded constructions, the influence of boundary conditions and additional factors in relation to the finiteness of the structure on sound transmission is no longer negligible, promoting the search of effective and accurate modeling means. The transmission 23,24 or radiation 22 of sound through finite single-leaf panels have been discussed from different viewpoints. Sgard et al 36 and Panneton and Atalla 37 employed finite element method ͑FEM͒ models to predict sound-transmission loss ͑STL͒ across finite-sized, double-panel sound barrier with poroelastic linings.…”

Section: Introductionmentioning

confidence: 99%

Vibroacoustic behavior of clamp mounted double-panel partition with enclosure air cavity

Xin

Lu²,

Chen³

2008

The Journal of the Acoustical Society of America

105

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A theoretical study on the vibroacoustic performance of a rectangular double-panel partition clamp mounted in an infinite acoustic rigid baffle is presented. With the clamped boundary condition taken into account by the method of modal function, a double Fourier series solution to the dynamic response of the structure is obtained by employing the weighted residual method (i.e., the Galerkin method). The double series solution can be considered as the exact solution of the problem, as the structural and acoustic-structural coupling effects are fully accounted for and the solution converges numerically. The accuracy of the theoretical predictions is checked against existing experimental data, with good agreement achieved. The influence of several key parameters on the sound isolation capability of the double-panel configuration is then systematically studied, including panel dimensions, thickness of air cavity, elevation angle, and azimuth angle of incidence sound. The present method is suitable for double-panel systems of finite or infinite extent and is applicable for both low- and high-frequency ranges. With these merits, the proposed method compares favorably with a number of other approaches, e.g., finite element method, boundary element method, and statistical energy analysis method.

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“…Often, the experimental measurements do not possess reproducibility, and different STL curves from different laboratories were obtained even though the same panels were compared [38]. According to Kim et al [53], this may be attributed to the so-called tunneling effect, and the different mounting conditions adopted in different laboratories should be another key factor. On the other hand, to the authors' best knowledge, the problem of sound transmission through a double-panel partition with air cavity fully clamped (different from being simply supported) on its edges has not been analytically solved.…”

Section: Introductionmentioning

confidence: 99%

Transmission of Sound Through Finite Multiple-Panel Partition

Xin

2014

Springer Tracts in Mechanical Engineering

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This chapter is organized as three parts: in the first part, the vibroacoustic performance of a rectangular double-panel partition with enclosed air cavity and simply mounted on an infinite acoustic rigid baffle is investigated analytically. The sound velocity potential method rather than the commonly used cavity modal function method is employed, which possesses good expandability and has significant implications for further vibroacoustic investigations. The simply supported boundary condition is accounted for by using the method of modal function, and double Fourier series solutions are obtained to characterize the vibroacoustic behaviors of the structure. Results for sound transmission loss (STL), panel vibration level, and sound pressure level are presented to explore the physical mechanisms of sound energy penetration across the finite double-panel partition. Specifically, focus is placed upon the influence of several key system parameters on sound transmission, including the thickness of air cavity, structural dimensions, and the elevation angle and azimuth angle of the incidence sound. Further extensions of the sound velocity potential method to typical framed double-panel structures are also proposed.In the second part, the air-borne sound insulation performance of a rectangular double-panel partition clamp mounted on an infinite acoustic rigid baffle is investigated both analytically and experimentally, and compared with that of a simply supported one. With the clamped (or simply supported) boundary accounted for by using the method of modal function, a double series solution for the sound transmission loss (STL) of the structure is obtained by employing the weighted residual (Galerkin) method. Experimental measurements with Al double-panel partitions having air cavity are subsequently carried out to validate the theoretical model for both types of the boundary condition, and good overall agreement is achieved. A consistency check of the two different models (based separately on clamped modal function and simply supported modal function) is performed by

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Tunneling effect in sound transmission loss determination: Theoretical approach

Cited by 16 publications

References 15 publications

Numerical examination of niche effect on sound transmission loss of glass panes

Numerical examination of niche effect on sound transmission loss of glass panes

Vibroacoustic behavior of clamp mounted double-panel partition with enclosure air cavity

Transmission of Sound Through Finite Multiple-Panel Partition

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