Active control of interior noise in a three-dimensional enclosure

Balachandran, Balakumar; Sampath, Arun; Park, J

doi:10.1088/0964-1726/5/1/010

Cited by 53 publications

(33 citation statements)

References 12 publications

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“…They concluded that the use of vibration error signals in an adaptive feedforward active control system was a practical alternative to attenuate acoustic radiation of the panel via vibration control inputs. Balachandran et al (1996) developed analytical and experimental studies for controlling the interior noise in a rectangular enclosure with a flexible wall excited by an external speaker. The active control was implemented by using lead zirconate titanate piezoelectric (PZT) actuators bonded to the flexible wall.…”

Section: Active Controlmentioning

confidence: 99%

The influence of structural-acoustic coupling on the dynamic behaviour of a one- dimensional vibro-acoustic system

Kim

2009

The Journal of the Acoustical Society of America

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The aim of this thesis is to investigate the structural-acoustic coupling effects on the dynamic behaviour of a vibro-acoustic system under passive/active control. The simplest model of a vibro-acoustic system one can consider is a one-dimensional acoustic cavity driven by a single-degree-of-freedom (SDOF) structure. This simple model is used to demonstrate the physical characteristics of the coupling phenomenon. This simple analytical model can provide various degrees of structural-acoustic coupling, which are dependent upon (i) the structural-acoustic stiffness ratio, (ii) structural-acoustic natural frequency ratio, (iii) structural damping, and (iv) acoustic damping. In this case, although the geometric coupling factor is not included because the SDOF structure has a single mode, 80 percent of the factors that determine the degree of coupling can be accounted for by the simple analytical model. The coupling mechanism, in the simple vibro-acoustic system, is investigated using the mobilityimpedance approach. In order to provide the threshold of the degree of coupling, a coupling factor is calculated in terms of non-dimensional structural-acoustic parameters. Vibroacoustic responses are represented by the acoustic potential energy in the cavity and the kinetic energy of the structure coupled to the acoustic cavity.The vibro-acoustic responses are investigated for various coupled cases. The principles are demonstrated by controlling the acoustic potential energy in the one-dimensional finite acoustic tube driven by the SDOF structure. Three control strategies are applied; passive control, active feedforward control and decentralised velocity feedback control. Passive control is investigated to achieve physical insight into the relative benefits of passive control i treatments. In the more strongly coupled case, acoustical modifications were preferable for the reduction of the acoustic potential energy. On the other hand, in the more weakly coupled case, structural modifications were more effective. For harmonic disturbance, an active feedforward control strategy is considered for the control of the acoustic potential energy in the cavity driven by the structure under external harmonic excitation. For the active feedforward control systems, this study uses the concept of optimal impedance, which is defined as the ratio of the control force to the velocity of a secondary source when the acoustic potential energy is minimised. In the more strongly coupled case, all the acoustic modes were effectively suppressed at the resonance frequencies. On the other hand, in the more weakly coupled case, all the acoustic modes were controllable as in the more strongly coupled case. However, the structural mode was generally uncontrollable. For broadband disturbance, decentralised velocity feedback control is formulated to investigate the relative control effectiveness of structural and acoustic actuators for the control of the acoustic potential energy. In the more strongly coupled case, the control configuration of using the ...

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Section: Active Controlmentioning

confidence: 99%

The influence of structural-acoustic coupling on the dynamic behaviour of a one- dimensional vibro-acoustic system

Kim

2009

The Journal of the Acoustical Society of America

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“…Asymptotic modal analysis technique has been proposed [8] to analysis such problems and it is shown that this method has advantages over traditional methods used for solving dynamics problems with a large number of modes. A mechanics-based analytical model has been developed [9] to address the interactions between a panel and the sound field inside a rectangular enclosure. In this work, piezoelectric patches bonded to the panel are used as actuators, which are also included in the modeling.…”

Section: Introductionmentioning

confidence: 99%

Modeling of sound-structure interaction in a rectangular enclosure using finite element method

Mohamady

Montazeri

Kamil

2009

2009 IEEE Symposium on Industrial Electronics &Amp; Applications

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In this paper the effect of periodic noise traveling into a rectangular enclosure is simulated using finite element technique using COMSOL Multiphysics software. The acoustic wave which is generated by a point source outside an enclosure propagates through the enclosure wall and excites the flexible panel which is mounted on the enclosure. The behavior of transmission of sound into the cavity is investigated by computing the modal characteristics of the cavity. Base on the model proposed, simulation part is conducted to examine the natural frequency response of system as well as to compute the distortion effect of the structure response and the acoustic pressure observed within the enclosure. The simulation results were compared with previous experimental and analytical works for validation and a good match between them were obtained.

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“…Crane et al [11], Dungan et al [12], Wang [13], Kim et al [14], Bao et al [15], Ko and Tongue [16], Balachandran et at. [17] and recently, Pletner et al [18], represent only a few references in which theoretical and experimental efforts were made to apply active acoustical control to reduce noise levels. In some of the works [13][14][15][16][17][18], use was made of PZT patches acting to induce strains and to control and then attenuate interior noise.…”

Section: Introductionmentioning

confidence: 99%

Actuation and Sensing of Soft Core Sandwich Plates with a Built-In Adaptive Layer

Abramovich

Meyer-Piening

2001

Jnl of Sandwich Structures & Materials

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The present work presents experimental studies performed on soft core sandwich planar plates with a built-in adaptive layer. This adaptive layer consists of an aluminum plate equipped with piezoelectric ceramic transducers (PZT) bonded in pairs on its two faces. The PZT patches can sense deflections using the direct piezoelectric effect (producing charge under the application of stress) and can be also used as actuators to induce deflections to the structure, using the converse piezoelectric effect (inducing shear deformations to the host structure by its stretching or shrinkage under the application of voltage). This new configuration of the sandwich plate has the main advantage of protecting the brittle ceramic transducers by placing them inside the core. The outside sandwich faces then remain unobstructed. The usage of such planar sandwich plates is then discussed.

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Active control of interior noise in a three-dimensional enclosure

Cited by 53 publications

References 12 publications

The influence of structural-acoustic coupling on the dynamic behaviour of a one- dimensional vibro-acoustic system

The influence of structural-acoustic coupling on the dynamic behaviour of a one- dimensional vibro-acoustic system

Modeling of sound-structure interaction in a rectangular enclosure using finite element method

Actuation and Sensing of Soft Core Sandwich Plates with a Built-In Adaptive Layer

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