Modal Control of Acoustic Plants

Dohner, Jeffrey L.; Shoureshi, R.

doi:10.1115/1.3269860

Cited by 18 publications

(4 citation statements)

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“…Most active control work by structural acousticians is based in the frequency domain [1,5,17], and while real-time predictions for structural velocity appear many times in literature [18][19][20][21][22][23], there is no one result that enables real-time acoustic pressure simulation from a two-dimensional vibrating structure to any point in space. Dohner et al [24] produced a state-space model for acoustic pressure in an enclosure excited by a simple volume velocity source. Where real-time predictions for acoustic pressure radiated from a vibrating structure into free space do exist the results are limited to directly above the structure, where acoustic pressure is in phase with the modal response [25,26].…”

Section: Introductionmentioning

confidence: 99%

Deriving time-domain models of structural-acoustic radiation into free space

Hill

Snyder

Cazzolato

2005

Mechanical Systems and Signal Processing

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Section: Introductionmentioning

confidence: 99%

Deriving time-domain models of structural-acoustic radiation into free space

Hill

Snyder

Cazzolato

2005

Mechanical Systems and Signal Processing

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“…[17][18][19] Compared with classical control theory, modern control theory has a number of advantages, as follows. ͑1͒ It is assured that the designed controller is causal because a control system is analyzed and designed in the time domain on the basis of the concept of state variables.…”

Section: Introductionmentioning

confidence: 99%

A state feedback electro-acoustic transducer for active control of acoustic impedance

Samejima¹

2003

The Journal of the Acoustical Society of America

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In this paper, a new control system in which the acoustic impedance of an electro-acoustic transducer diaphragm can be actively varied by modifying design parameters is presented and its effectiveness is theoretically investigated. The proposed control system is based on a state-space description of the control system derived from an electrical equivalent circuit of an electro-acoustic transducer to which a differentiating circuit is connected, and is designed using modem control theory. The optimal quadratic regulator is used in the control system design, with its quadratic performance index formulated for producing desired acoustic impedance. Computer simulations indicate that the acoustic impedance of the diaphragm can be significantly varied over a wide frequency range that includes the range below the resonance frequency of the electro-acoustic transducer. A computer model of the proposed control system is used to illustrate its application to semi-active noise control in a duct. It is demonstrated that the proposed control system provides substantial reductions in the noise radiating from the outlet of the duct, both in the stiffness control range and in the mass control range.

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“…Several studies on the application of modern control theory based on the state-space method for active control of sound fields have been published. Dohner et al [6] and Bai PAPER et al [7] developed active noise control systems using linear quadratic optimal control. In their system, the full sound field was regarded as a plant, however it was assumed that the modal parameters for describing the sound field in state space were known theoretically or experimentally.…”

Section: Introductionmentioning

confidence: 99%

Active modal control of sound fields by finite element modeling and H.INF. control theory.

Samejima¹,

Yamamoto²

2002

Acoust. Sci. & Tech.

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A new method of feedback control of sound fields that minimizes the total acoustic energy in a sound field of any shape excited by an unknown disturbance is presented. The proposed method is based on the finite element method and H 1 control theory, and achieves both robust performance and high stability. The structure of the acoustic plant is formulated such that the H 1 norm of the system transfer function expresses the total acoustic energy in the sound field. Computer simulations verify that the damping of a sound field can be increased without leading to instabilities of the closed loop system. It is also verified that the resonant peaks in the frequency spectrum of the total acoustic energy can be attenuated in the low-frequency range involved in the nominal model of the plant without exciting the residual mode dynamics in the high-frequency range. The control performance can be tuned by adjusting the weighting factor. Using this method, it is possible to dynamically alter the characteristics of a sound field.

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Modal Control of Acoustic Plants

Cited by 18 publications

References 0 publications

Deriving time-domain models of structural-acoustic radiation into free space

Deriving time-domain models of structural-acoustic radiation into free space

A state feedback electro-acoustic transducer for active control of acoustic impedance

Active modal control of sound fields by finite element modeling and H.INF. control theory.

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