The transmission loss of finite sized double panels in a random incidence sound field

Cummings, A.; Mulholland, K.A.

doi:10.1016/0022-460x(68)90199-5

Cited by 35 publications

(16 citation statements)

References 3 publications

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“…For validation, the analytical solutions are compared with the existing experiment results [22], as shown in Fig. 1.3.…”

Section: Model Validationmentioning

confidence: 99%

“…1.3. A diffuse incident sound is assumed for the calculation of structural STL, with the structural dimensions and panel material properties same as those used in the experiment [22]. As mentioned above, an empirical value of the limiting elevation angle ' lim is usually assumed.…”

Section: Model Validationmentioning

confidence: 99%

“…For simply supported, finite rectangular double-panel structures, existing studies [3,[22][23][24][25][26][27][32][33][34][35][36][37] concerned mainly with the loss of sound transmission across the structure, without detailed analysis about the energy transmission, the vibroacoustic coupling effects, and the physical mechanisms of sound transmission process across the structure. In particular, previous studies on double-panel partitions focus on either infinite extent or finite extent, without exploring the natural relationship between the two.…”

Section: Introductionmentioning

confidence: 99%

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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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“…For validation, the analytical solutions are compared with the existing experiment results [22], as shown in Fig. 1.3.…”

Section: Model Validationmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Transmission of Sound Through Finite Multiple-Panel Partition

Xin

2014

Springer Tracts in Mechanical Engineering

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“…The model developed "rstly by Mulholland et al [18] will be used in this study, The advantages of the model are that the acoustical data is easily obtained. The model was later improved by Cummings and Mulholland and the theory proved to give good results [19]. In reference [18] the absorbent was located on the edges of the cavity.…”

Section: The Effect Of Cavity Absorbentsmentioning

confidence: 99%

“…In reference [18] the absorbent was located on the edges of the cavity. In reference [19] the panels themselves could have an absorption coe$cient. These models presuppose numerical integration to obtain di!use "eld transmission coe$cients and this model is therefore not a &&simple algebraic model'' in its pure sense.…”

Section: The Effect Of Cavity Absorbentsmentioning

confidence: 99%