Active control by using optical sensors on the acoustic radiation from square plates

Chen, K.T.; Chang, Shu Hua; Chou, C.H.; Liu, Y.H.

doi:10.1016/j.apacoust.2006.11.006

Cited by 2 publications

(1 citation statement)

References 21 publications

(27 reference statements)

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“…The piezoelectric materials are particularly used in new-generation high-performance smart structures for vibration and noise control owing to their low power consumption, lightweight, flexibility, wide dynamic range, and fast response time. 6,7 Also, a wide variety of control strategies, such as velocity feedback control, 8 optimal control, 9,10 neural network control, 11 adaptive control, 12 and scriptH2 13 and scriptH∞ robust control 14,15 theories, have been developed for active vibro-acoustic response control of oscillating fluid-coupled structures. Important among these control schemes are the scriptH∞ controllers that have the key advantage of systematically assuring the robust performance/stability along with optimized vibration eradication in the face of uncertainties in the nominal system model and external disturbances.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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The Total Acoustic Power of a Clamped Circular Plate Located at the Boundary of Three-Wall Corner Region

2011

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The energetic aspect of the sound radiation has been analyzed in the case of the three-wall corner region. This region is the part of space bounded by three baes arranged perpendicularly to one another. The Neumann boundary value problem has been solved assuming that the sound source is the vibrating circular plate embedded in one of the baes of the three-wall corner region. The KelvinVoigt theory of a visco-elastic plate has been used which allows to include internal attenuation existing in the plate material. It has been assumed that the sound source is excited to vibrations by the external pressure asymmetrically distributed on the plate surface. The modal coecients of the acoustic impedance have been obtained in the form of the expressions containing single integrals only. The formula describing the acoustic power of the analyzed sound source has been presented as a fourfold innite series containing the modal coecients of the acoustic impedance. The inuence of some asymmetric excitations on the acoustic power has been analyzed. The possibilities of the modelling some uniform excitations located on the plate fragment of the small area by the point force excitation has been examined. The inuence of the transverse baes on the acoustic power has also been investigated. It has been determined for which frequency the baes inuence on the acoustic power is the greatest.

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Active control by using optical sensors on the acoustic radiation from square plates

Cited by 2 publications

References 21 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

The Total Acoustic Power of a Clamped Circular Plate Located at the Boundary of Three-Wall Corner Region

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