The influence of boundaries on sound insulation of the multilayered aerospace poroelastic composite structure

Talebitooti, Roohollah; Zarastvand, M.R.; Gohari, Hamed Darvish

doi:10.1016/j.ast.2018.07.030

Cited by 50 publications

(12 citation statements)

References 45 publications

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“…In this section, it is essential to create a coupling between fluid particle and shell surface in the internal and external spaces, therefore the following equations should be taken into account (Talebitooti et al, 2018c):…”

Section: Boundary Conditionmentioning

confidence: 99%

Investigating Hyperbolic Shear Deformation Theory on vibroacoustic behavior of the infinite Functionally Graded thick plate

Talebitooti

Zarastvand

Rouhani

2019

Lat. Am. j. solids struct.

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This paper applies acoustic analysis of Sound Transmission Loss (STL) through infinite Functionally Graded (FG) thick plate employing Hyperbolic Shear Deformation Theory (HSDT). The procedure for applying a FG plate is followed by considering the material properties are changed continually based on power-law distribution of the materials in terms of volume fraction. The main benefit of HSDT can be justified knowing the fact that, it uses parabolic transverse shear strain across thickness direction. Therefore, no need to enter the extra effect of shear correction coefficient factor. Besides, the displacement field is extended as a combination of polynomial as well as hyperbolic tangent function by neglecting the effect of thickness stretching. Furthermore, the equations of motion are obtained employing Hamilton's Principle. To provide an analytical solution based on HSDT, equations of motion are combined with acoustic wave equations. Moreover, some comparisons are made with the known theoretical and experimental results available in literature to verify the accuracy and efficiency of the current formulation. These comparisons reveal an excellent agreement. Consequently, some configurations are presented to demonstrate which parameters appear to be effective to improve the behavior of STL including the effects of modulus of elasticity and density in the thickness direction with respect to various power-law distributions.

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Section: Boundary Conditionmentioning

confidence: 99%

Investigating Hyperbolic Shear Deformation Theory on vibroacoustic behavior of the infinite Functionally Graded thick plate

Talebitooti

Zarastvand

Rouhani

2019

Lat. Am. j. solids struct.

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“…Denli and Sun [9,10] take the fiber lining direction as the design variable and increase the STL of a composite cylindrical shell as the optimization objective, which effectively improves the STL of the structure in the low-frequency region. Talebitooti et al [11] performed an acoustic analysis of the four sides that simply supported doubly curved composite shell interlayered with porous materials. Valvano et al [12] proposed a sound transmission analytical formulation considering fractional derivatives models for the viscoelastic damping for multilayered shells made of composite and viscoelastic layers.…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis of Cylindrical Shell Cavity Noise with Melamine Foam Lining

Yan

et al. 2021

Shock and Vibration

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To solve the problem of the harsh midlow frequency noise of rocket fairing, the cylindrical section of the protective precision instrument fairing is simplified as cylindrical shells, and different lining strategies of melamine foam (MF) are studied experimentally and numerically. Based on Virtual.Lab Acoustic software, a finite element model of the cylindrical cavity is established, and the correctness is verified by comparison with the measured data. On that basis, the influences of the lining position of different thickness MF on the noise reduction of cylindrical shells are investigated. It is shown that the thickness and location of the laying material have a significant effect on the noise reduction at the same specific gravity.

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“…In other works (Talebitooti et al, 2018d; Talebitooti and Zarastvand, 2018c), the focus was specially placed on the vibroacoustic behavior of the infinite shells based on the first and third order shear deformation theories. They also inspected the effect of a porous material on the sound insulation property of the infinite and finite doubly curved shells (Talebitooti and Zarastvand, 2018b; Talebitooti et al, 2018e). In addition, in other works (Talebitooti et al, 2017; 2019), an optimization method based on the genetic algorithm (GA) was used to optimize the STL of the poroelastic structures.…”

Section: Introductionmentioning

confidence: 99%

Acoustic performance prediction of a multilayered finite cylinder equipped with porous foam media

Gohari

Zarastvand

Talebitooti

2020

Journal of Vibration and Control

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This paper presents an analytical model to embed porous materials in a finite cylindrical shell in order to obtain the sound transmission loss coefficient. Although the circumferential modes are considered only for calculating the amount of the transmitted noise through an infinitely long cylinder, the present study employs the longitudinal modes in addition to circumferential ones to analyze the vibroacoustic performance of a simply supported cylinder subjected to the porous core based on the first order shear deformation theory. To achieve this goal, the structure is immersed in a fluid and excited by an acoustic wave. In addition, the acoustic pressures and the displacements are developed in the form of double Fourier series. Since these series consist of infinite modes, it is essential to terminate this process by considering adequate modes. Hence, the convergence checking algorithm is employed in the form of some three-dimensional configurations with respect to length, frequency and radius. Afterwards, some figures are plotted to confirm the accuracy of the present formulation. In these configurations, the obtained sound transmission loss from the present study is compared with that of the infinite one. It is shown that by increasing the length of the structure, the results are approached to sound transmission loss of the infinite shells. Moreover, a new approach is proposed to show the transverse displacement of a finite poroelastic cylinder at different frequencies. Based on the outcomes, it is found that by enhancing the length of the poroelastic cylinder, the amount of the transmitted sound into the structure is reduced at the high frequency domain. However, the sound insulation property of the structure is improved at the low frequency region when the radius of the shell is decreased.

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The influence of boundaries on sound insulation of the multilayered aerospace poroelastic composite structure

Cited by 50 publications

References 45 publications

Investigating Hyperbolic Shear Deformation Theory on vibroacoustic behavior of the infinite Functionally Graded thick plate

Investigating Hyperbolic Shear Deformation Theory on vibroacoustic behavior of the infinite Functionally Graded thick plate

Simulation Analysis of Cylindrical Shell Cavity Noise with Melamine Foam Lining

Acoustic performance prediction of a multilayered finite cylinder equipped with porous foam media

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