An exact solution of three-dimensional elasticity for sound transmission loss through FG cylinder in presence of subsonic external flow

Daneshjou, K.; Talebitooti, Roohollah; Tarkashvand, A.

doi:10.1016/j.ijmecsci.2016.10.008

Cited by 21 publications

(17 citation statements)

References 44 publications

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“…The method can be used to model multi-layered noise control treatment for example, in functionally graded material and composite laminates. Daneshjou et al [33] employed this method to estimate the STL of a functionally graded cylinder under subsonic external flow. Effects of certain parameters such as the Mach number, incident angle, panel thickness and radius of the cylindrical structure on the STL were investigated.…”

Section: Transfer Matrix Methodsmentioning

confidence: 99%

“…Transition frequency where a reduction in STL first occurs especially for curved panels. [33,34] Critical…”

Section: Symbol Formula Definition Referencementioning

confidence: 99%

“…-Dip frequency at which the structural and acoustic wave number coincides. [34,36] Several studies of transmission loss for sandwich and composite DPS have revealed various important regions [33]. However, the transmission loss characteristics curve can be generally divided into three regions-the stiffness controlled region, the mass controlled region and the coincidence controlled region [34,[37][38][39][40][41] as depicted in Figure 1.…”

Section: Symbol Formula Definition Referencementioning

confidence: 99%

“…Moreover, at the resonance dip frequency, the STL curve of the ceramic-rich FGM shifted to a higher frequency than the metal and metal-rich FGM for all incident angles investigated. A three dimensional analytical model was developed by Daneshjou et al [33] to estimate the STL of a FGM cylindrical shell as shown in Figure 8. The graded constituents were also metal (i.e., aluminum) and ceramics (i.e., alumina and zirconia) as material of choice previously used by Chandra et al [84].…”

Section: Functionally Graded Materials Of Sandwich Structuresmentioning

confidence: 99%

“…However, for thick-walled cylindrical structures, increased densities do not necessarily increase the STL because during transmission loss of the structure, the mass controlled region disappears [85]. Moreover, the authors [33] took into consideration the external flow effect and various Mach numbers from −0.5 to 0.5 were studied. It was observed that the STL increased with Mach number at stiffness and coincidence controlled zones especially when the Mach numbers were negative.…”

Section: Functionally Graded Materials Of Sandwich Structuresmentioning

confidence: 99%

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Comparative Study of Sound Transmission Losses of Sandwich Composite Double Panel Walls

2020

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The increasing motivation behind the recently wide industrial applications of sandwich and composite double panel structures stems from their ability to absorb sounds more effectively. Meticulous selection of the geometrical and material constituents of both the core and panels of these structures can produce highly desirable properties. A good understanding of their vibro-acoustic response and emission index such as the sound transmission loss (STL) is, therefore, a requisite to producing optimal design. In this study, an overview of recent advances in STL of sandwich and composites double panels is presented. At first, some salient explanation of the various frequency and controlled regions are given. It then critically examines a number of parameter effects on the STL of sandwich and composite structures. Literatures on the numerical, analytical and experimental solutions of STL are systematically presented. Efficient and more reliable optimization problems that maximize the STL and minimize the objective functions capable of degrading the effectiveness of the structure to absorb sounds are also provided.

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Section: Transfer Matrix Methodsmentioning

confidence: 99%

“…Transition frequency where a reduction in STL first occurs especially for curved panels. [33,34] Critical…”

Section: Symbol Formula Definition Referencementioning

confidence: 99%