Vibroacoustic study on a multilayered functionally graded cylindrical shell with poroelastic core and bonded-unbonded configuration

Daneshjou, K.; Talebitooti, Roohollah; Kornokar, Mohammad

doi:10.1016/j.jsv.2017.01.001

Cited by 41 publications

(11 citation statements)

References 25 publications

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“…see Refs. [4][5][6][7][8]75] for full discussions). Therefore, redundant description of these standard features will be avoided here, and the main focus will be primarily made on performance of the implemented SMC controller in different regions.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…In the mass-controlled region (i.e. beyond the ring frequency), on the other hand, the SMC controller is not expected to contribute to STL enhancement, as it does not add any mass to the structural system, and other approaches should be sought [4][5][6]8,9]. The most interesting observation is perhaps the superior performance of ERF-based SMC controller in elegant avoidance of the highly undesirable structural/acoustic resonance-based dips within the stiffness-controlled region (particularly near the ring frequency), nearly regardless of angle of incidence.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…piping systems, ducts, aircraft fuselages, launch vehicles, pressure vessels, machine casings, highspeed trains, rockets, submarine hulls, torpedoes, etc.). In particular, the vibroacoustics of fluid-submerged cylindrical structures experiencing incident sound waves and/or wideband mechanical excitations is an imperative multi-physics (fluid/solid interaction) problem of fundamental interest that has been extensively investigated in the past few decades [1][2][3][4]. Reduction of sound transmission through (acoustic radiation from) such structures based only on the classical passive (viscoelastic/porous) sound insulation/absorption treatments (e.g., see [5][6][7][8][9]) is not eminently practical due to several reasons such as unfavorable increase in structural weight/volume, and deterioration of the vibration damping or sound absorbing material performance with environmental harshness and variations in frequency and temperature.…”

Section: Introductionmentioning

confidence: 99%

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Active damping of sound transmission through an electrorheological fluid-actuated sandwich cylindrical shell

Hasheminejad

Cheraghi

Jamalpoor

2018

Jnl of Sandwich Structures & Materials

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An exact model is proposed for sound transmission through a sandwich cylindrical shell of infinite extent that includes a tunable electrorheological fluid core, and is obliquely insonified by a plane progressive acoustic wave. The basic formulation utilizes Hamilton’s variational principle, the classical and ﬁrst order shear deformation shell theories, the Kelvin–Voigt viscoelastic damping model (for the electrorheological fluid-core layer), and the wave equations for internal/external acoustic domains coupled by the proper fluid/structure compatibility relations. The Fourier–Bessel series expansions are used to arrange the governing (coupled) system equations in state-space form. The classical Sliding Mode Control law is then applied to semi-actively reduce sound transmission through the composite cylinder by smart variation of stiffness and damping characteristics of the electrorheological fluid-core actuator layer according to the control command. Numerical results present both the uncontrolled and controlled sound transmission loss spectra of the sandwich cylindrical shell at three angles of incidence for three distinct sets of material input parameters that represent the electric-field dependency of the complex shear modulus of the electrorheological fluid-core layer. The superior soundproof performance of electrorheological fluid-based sliding mode control system in avoiding the highly detrimental sound transmission loss dips occurring throughout the critical resonance and coincidence regions is demonstrated. Likewise, remarkable enhancements in the sound insulation characteristics of the electrorheological fluid-actuated structure utilizing the first or second electrorheological fluid material model are achieved within the stiffness-controlled region, especially at lower frequencies in near-grazing incidence situation. A number of limiting cases are introduced and validity of the formulation is confirmed by comparison with the available data.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Numerical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Active damping of sound transmission through an electrorheological fluid-actuated sandwich cylindrical shell

Hasheminejad

Cheraghi

Jamalpoor

2018

Jnl of Sandwich Structures & Materials

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“…However, the core of the DPS can be made of FGM as demonstrated by Chandra et al [87]. Other notable authors [88][89][90][91][92] have adopted the FGM to model the vibro-acoustic response of structural panels. ceramic-rich FGM shifted to a higher frequency than the metal and metal-rich FGM for all incident angles investigated.…”

Section: Functionally Graded Materials Of Sandwich Structuresmentioning

confidence: 99%

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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“…Comparing and analyzing sound radiation from material parameters of laminates, the conspicuousness of material composition on response, and the coupling effect of material proportion on sound radiation is often of great significance [ 19 , 20 , 21 ]. In terms of structural parameters, the research on sound radiation has developed from the design of normal geometrical parameters (aspect ratio, thickness) of laminates to more complex structural forms such as periodically reinforced structures and non-uniform laying [ 22 , 23 , 24 , 25 ]. In addition, as a current hotspot, the investigation of acoustic radiation of functionally graded laminates comprehensively considers the effects of materials, structures, external excitations, and the environment [ 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Sound Radiation of Orthogonal Antisymmetric Composite Laminates Embedded with Pre-Strained SMA Wires in Thermal Environment

Huang

Zhang

et al. 2020

Materials

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The interest of this article lies in the sound radiation of shape memory alloy (SMA) composite laminates. Different from the traditional method of avoiding resonance sound radiation of composite laminates by means of structural parameter design, this paper explores the potential of adjusting the modal peak of the resonant acoustic radiation by using material characteristics of shape memory alloys (SMA), and provides a new idea for avoiding resonance sound radiation of composite laminates. For composite laminates embedded with pre-strained SMA, an innovation of vibration-acoustic modeling of SMA composite laminates considering pre-stain of SMA and thermal expansion force of graphite-epoxy resin is proposed. Based on the classical thin plate theory and Hamilton principle, the structural dynamic governing equation and the frequency equation of the laminates subjected to thermal environment are derived. The vibration sound radiation of composite laminates is calculated with Rayleigh integral. Effects of ambient temperature, pre-strain, SMA volume fraction, substrate ratio, and geometrical parameters on the sound radiation were analyzed. New laws of SMA material and pre-strain characteristics on sound radiation of composite laminates under temperature environment are revealed, which have theoretical and engineering functional significance for vibration and sound radiation control of SMA composite laminates.

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Vibroacoustic study on a multilayered functionally graded cylindrical shell with poroelastic core and bonded-unbonded configuration

Cited by 41 publications

References 25 publications

Active damping of sound transmission through an electrorheological fluid-actuated sandwich cylindrical shell

Active damping of sound transmission through an electrorheological fluid-actuated sandwich cylindrical shell

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

Sound Radiation of Orthogonal Antisymmetric Composite Laminates Embedded with Pre-Strained SMA Wires in Thermal Environment

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