Dynamic viscoelastic effects on sound wave scattering by an eccentric compound circular cylinder

Hasheminejad, Seyyed M.; Kazemirad, Siavash

doi:10.1016/j.jsv.2008.04.022

Cited by 11 publications

(6 citation statements)

References 57 publications

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“…At this point, before considering the full active sound radiation control problem, it is worthy to briefly study some important sound radiation and mechanical characteristics of the water-immersed circular piezo-laminated Ba 2 …”

Section: M=s) An Expansive Mathematicamentioning

confidence: 99%

“…Active abatement of low-frequency noise and vibration emitted from vibro-acoustic systems, as a complimentary approach to the inactive restraining techniques that are normally appropriate in the medium- and high-frequency range, 1,2 has been a subject of great interest during the past few decades. Two main strategies are generally adopted, namely, active noise control 3 and the active structural acoustic control (ASAC).…”

Section: Introductionmentioning

confidence: 99%

“…15,19,41–42 These elements are of realistic concern in advancement of intelligent micro-electromechanical systems, 43,44 for which precise movement control is essential. It can readily be combined with the classical passive control methods 1,2,45,46 and/or expediently be augmented with multiple pairs of electroded piezoelectric actuator/sensor segments in a multi-input multi-output (MIMO) active control framework 47–49 to effectively deal with the medium- and high-frequency acoustic radiation problems. 1,2 Finally, the accessible set of numerical simulations can aid as the reference for evaluation of results acquired by the merely algorithmic or asymptotic methods.…”

Section: Introductionmentioning

confidence: 99%

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Robust active sound radiation control of a piezo-laminated composite circular plate of arbitrary thickness based on the exact 3D elasticity model

Hasheminejad

Keshavarzpour

2016

Journal of Low Frequency Noise, Vibration and Active Control

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A multi-objective mixed H 2 /H 1 robust output feedback control synthesis with regional pole placement constraints in a linear matrix inequalities framework is adopted for active low-frequency sound radiation control of an arbitrarily thick, rigidly baffled, simply supported, multi-layered piezo-composite circular panel. The adopted control system concurrently captures the benefits of both H 2 transient control performance and H 1 robust stability in the face of external disturbances and system uncertainties. Also, the implemented volumetric sensing/actuation configuration avoids the typical problems associated with conventional (spatially discrete) piezoelectric sensor/actuator patches, where the total volume velocity can be effectively cancelled with the main contribution being to the long wavelength acoustic power emission. The elasto-acoustic analysis is based on the spatial state-space method in the context of exact 3D elasticity theory along with the Rayleigh integral formula where Neumann's addition theorem is incorporated in the associated Hankel transform representation to arrive at a computationally efficient expression for the nonaxisymmetric pressure field within the acoustic half-space, valid in both near and far fields. Subspace system identification of the fully coupled structure-fluid interaction problem is performed, and the truncated modes are considered as multiplicative uncertainties in synthesis of the mixed-norm controller. Numerical simulations establish the ability of the implemented volumetric sensing/actuation methodology in cooperation with the multi-objective robust active control scheme for restraining low-frequency sound radiation from a Ba 2 NaNb 5 O 15 /steel/PZT4 circular piezo-laminated plate, without provoking instability of the closed-loop system. Also, superior bandwidth frequency and tracking performance in comparison to the H 2 and H 1 controllers are observed. This work is believed to be the first such attempt to exactly model (and actively control) the 3D nonaxisymmetric acousto-elastodynamic frequency response of an arbitrarily thick, smart piezo-laminated circular plate in heavy fluid loading condition (i.e. without using any kind of far-field, low-frequency, and/or light fluid coupling approximations), with straightforward extensibility for any arbitrary through-thickness variation of distributed material properties.

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Section: M=s) An Expansive Mathematicamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Robust active sound radiation control of a piezo-laminated composite circular plate of arbitrary thickness based on the exact 3D elasticity model

Hasheminejad

Keshavarzpour

2016

Journal of Low Frequency Noise, Vibration and Active Control

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“…In particular, the nonstationary fluid-structure interaction of submerged cylindrical shell structures experiencing weak shock loads or wideband mechanical excitations is a challenging multi-physics problem of fundamental value that has been widely investigated over the past several decades (Hasheminejad, Mousavi-akbarzadeh, 2013; Leblond, Sigrist, 2010; Iakovlev et al, 2012;. Suppression of sound radiation from these structures based on the traditional passive control methods Hasheminejad, Kazemirad, 2008) is generally inadequate due to the degradation of the damping characteristics of such treatments under temperature and frequency deviations in addition to the cost of adding considerable weight or volume to the vibrating structure. Recent advances in the field of smart material technology in conjunction with the significant improvements in the computational ability of microcomputers have provided efficient means to reduce vibration and acoustic emission of distributed parameter structural systems (Crawley, de Luis, 1987; Hasheminejad, AlaeiVarnosfaderani, 2012; 2013; Hasheminejad, Keshavarzpour, 2013).…”

Section: Introductionmentioning

confidence: 99%

Active Transient Sound Radiation Control from a Smart Piezocomposite Hollow Cylinder

Hasheminejad¹,

Rabbani²

2015

Archives of Acoustics

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The linear 3D piezoelasticity theory along with active damping control (ADC) strategy are applied for non-stationary vibroacoustic response suppression of a doubly fluid-loaded functionally graded piezolaminated (FGPM) composite hollow cylinder of infinite length under general time-varying excitations. The control gain parameters are identified and tuned using Genetic Algorithm (GA) with a multi-objective performance index that constrains the key elasto-acoustic system parameters and control voltage. The uncontrolled and controlled time response histories due to a pair of equal and opposite impulsive external point loads are calculated by means of Durbin's numerical inverse Laplace transform algorithm. Numerical simulations demonstrate the superior (good) performance of the GA-optimized distributed active damping control system in effective attenuation of sound pressure transients radiated into the internal (external) acoustic space for two basic control configurations. Also, some interesting features of the transient fluid-structure interaction control problem are illustrated via proper 2D time domain images and animations of the 3D sound field. Limiting cases are considered and accuracy of the formulation is established with the aid of a commercial finite element package as well as comparisons with the current literature.

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“…1), previous works showed that the linear acoustic scattering [19][20][21] is significantly altered; bifurcation and resonance shifting occur, which amount to the degree of eccentricity. [22,23] How eccentricity affects the time-averaged radiation force remains to be fur-ther explored, which constitutes the main objective of this study. Interestingly, in addition to the radiation force effect, this work shows that a novel effect related to the time-averaged radiation torque (causing particle rotation) about its center of mass arises as well, which is not associated with sound absorption [15] as the eccentric fluid layered cylinder considered here is non-viscous.…”

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confidence: 99%

Acoustic radiation force and torque on a lossless eccentric layered fluid cylinder

Mitri¹

2020

Chinese Phys. B

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Exact analytical equations and computations for the longitudinal and transverse acoustic radiation force and axial torque components for a lossless eccentric liquid cylinder submerged in a nonviscous fluid and insonified by plane waves progressive waves (of arbitrary incidence in the polar plane) are established and computed numerically. The modal matching method and the translational addition theorem in cylindrical coordinates are used to derive exact mathematical expressions applicable to any inner and outer cylinder sizes without any approximations, and taking into account the interaction effects between the waves propagating in the layer and those scattered from the cylindrical core. The results show that longitudinal and transverse radiation force components arise, in addition to the emergence of an axial radiation torque component acting on the non-absorptive compound cylinder due to geometrical asymmetry as the eccentricity increases. The computations demonstrate that the axial torque component, which arises due to a geometrical asymmetry, can be positive (causing counter-clockwise rotation in the polar plane), negative (clockwise rotation) or neutral (rotation cancellation) depending on the size parameter of the cylinder and the amount of eccentricity. Furthermore, verification and validation of the results have been accomplished from the standpoint of energy conservation law applied to scattering, and based on the reciprocity theorem.

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Dynamic viscoelastic effects on sound wave scattering by an eccentric compound circular cylinder

Cited by 11 publications

References 57 publications

Robust active sound radiation control of a piezo-laminated composite circular plate of arbitrary thickness based on the exact 3D elasticity model

Robust active sound radiation control of a piezo-laminated composite circular plate of arbitrary thickness based on the exact 3D elasticity model

Active Transient Sound Radiation Control from a Smart Piezocomposite Hollow Cylinder

Acoustic radiation force and torque on a lossless eccentric layered fluid cylinder

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