A new hybrid passive–active noise absorption system

Beyene, Samson; Burdisso, Ricardo A.

doi:10.1121/1.418105

Cited by 43 publications

(24 citation statements)

References 7 publications

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“…Beyene and Burdisso 7 provide both numerical and experimental studies of a new impedance-matching approach as applied to the cavity absorption problem. Again, a layer of sound-absorbing material is mounted a short distance away from an active wall.…”

Section: Introductionmentioning

confidence: 99%

A broadband passive–active sound absorption system

Smith

Johnson

Burdisso

1999

The Journal of the Acoustical Society of America

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In recent years, hybrid absorption systems have been implemented which achieve high sound absorption over a broad frequency range. This work is an experimental study of a broadband hybrid absorption system which is comprised of a layer of sound-absorbing material ͑the passive component͒ positioned at a distance from a movable wall ͑the active component͒ inside an impedance tube. The movable wall is used to impose desired boundary conditions in the cavity behind the passive layer, thereby increasing the absorption of the system at frequencies where the passive material is not independently effective. Both pressure-release ͑i.e., minimizing the pressure at the back surface of the layer͒ and impedance-matching ͑i.e., minimizing the reflected wave from the layer͒ boundary conditions are studied. The performance of the hybrid system for these two boundary conditions is compared for broadband disturbances over a frequency range of 100-1000 Hz. The unmodified passive system showed absorption coefficients greater than 0.7 only above 500 Hz, while the impedance-matching condition yielded absorption coefficients of 0.8 to 1.0 over the 100-1000-Hz range. The impedance-matching condition provided significantly better absorption than that achieved with the pressure-release condition. The sensitivity of these control approaches to system parameters is also investigated.

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Section: Introductionmentioning

confidence: 99%

A broadband passive–active sound absorption system

Smith

Johnson

Burdisso

1999

The Journal of the Acoustical Society of America

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“…Snyder and Hansen [7] demonstrated the essential of sound transmission control is impedance matching. Beyene and Burdisso [8] proposed the impedance matching technique was generally superior to the pressure-release method. Okada et al [9,10] analyzed ANC in duct by means of impedance.…”

Section: Introductionmentioning

confidence: 99%

An electro-acoustics impedance error criterion and its application to active noise control

Yang

2004

Applied Acoustics

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“…Because they utilized analog circuitry for the controller they were only able to operate the system effectively at individual frequencies, but they recognized that by using digital filters broadband performance could likely be achieved. Although there have been numerous studies examining the modification of the acoustic impedance of systems to achieve noise reduction or performance improvements [2][3][4] or to enhance absorption, [5][6][7][8][9][10] there have been many fewer studies of approaches to modifying the mechanical impedance of a control device to achieve a desired effect. Bras et al 11 applied the concept in a very interesting way.…”

Section: Introductionmentioning

confidence: 99%

Reduction of turbulent boundary layer induced interior noise through active impedance control

Remington¹,

Curtis²,

Coleman³

et al. 2008

The Journal of the Acoustical Society of America

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The use of a single actuator tuned to an optimum impedance to control the sound power radiated from a turbulent boundary layer (TBL) excited aircraft panel into the aircraft interior is examined. An approach to calculating the optimum impedance is defined and the limitations on the reduction in radiated power by a single actuator tuned to that impedance are examined. It is shown that there are too many degrees of freedom in the TBL and in the radiation modes of the panel to allow a single actuator to control the radiated power. However, if the panel modes are lightly damped and well separated in frequency, significant reductions are possible. The implementation of a controller that presents a desired impedance to a structure is demonstrated in a laboratory experiment, in which the structure is a mass. The performance of such a controller on an aircraft panel is shown to be effective, if the actuator impedance is similar to but not the same as the desired impedance, provided the panel resonances are well separated in frequency and lightly damped.

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A new hybrid passive–active noise absorption system

Cited by 43 publications

References 7 publications

A broadband passive–active sound absorption system

A broadband passive–active sound absorption system

An electro-acoustics impedance error criterion and its application to active noise control

Reduction of turbulent boundary layer induced interior noise through active impedance control

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