Control of Aircraft Interior Noise Using Globally Detuned Vibration Absorbers

Fuller, Christopher R.; Maillard, Julien P.; Mercadal, Mathieu; Flotow, Andreas H. von

doi:10.1006/jsvi.1996.0867

Cited by 49 publications

(37 citation statements)

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“…It can be seen from this graph that although there is a reduction in the kinetic energy at some frequencies, at other frequencies the tuned neutralizer actually causes an increase in global vibration. This has been observed by Fuller et al [16] in the control of sound transmission through structures, which is also a global control problem. The reason for this can be seen by examining the tuned dynamic sti!ness of the neutralizer.…”

Section: Global Control Using a Single Tunable Vibration Neutralizermentioning

confidence: 76%

“…It was found, in this case, that it was preferable to use de-tuned vibration neutralizers rather than resonant devices to reduce the global sound pressure level inside the cabin [16]. Charette et al [17] showed in an experimental investigation that detuned vibration neutralizers were e!ective in reducing sound radiation from a panel over a frequency range.…”

Section: Introductionmentioning

confidence: 96%

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Global Control of Vibration Using a Tunable Vibration Neutralizer

Brennan

Dayou

2000

Journal of Sound and Vibration

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Tunable vibration neutralizers are currently used to control harmonic vibration of structures at the point at which they are attached, and the way in which the characteristics of the neutralizers in#uence their e!ectiveness in this role are reasonably well understood. However, the use of tunable vibration neutralizers to control global vibration of a structure has not been so well explored, and the aim of this paper is to investigate the parameters of the neutralizer that in#uence the control of the vibrational kinetic energy of a structure. It is shown that in general a de-tuned rather than a tuned vibration neutralizer is required at most frequencies, o!ering a sti!ness-like or a mass-like impedance to the structure. However, because this control strategy requires a measure of the global vibration of the host structure, which can be di$cult and/or costly in practice, it is preferable to use a tuned vibration neutralizer. For this to be e!ective it is demonstrated that the tuned neutralizer needs to be appropriately positioned on the structure. If this is the case then such a device can be almost as e!ective as a de-tuned neutralizer over quite a wide range of frequencies. An expression to determine the optimum ratio of the neutralizer mass to the modal mass of the structure is also derived.

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Section: Global Control Using a Single Tunable Vibration Neutralizermentioning

confidence: 76%

Section: Introductionmentioning

confidence: 96%

Global Control of Vibration Using a Tunable Vibration Neutralizer

Brennan

Dayou

2000

Journal of Sound and Vibration

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“…Such devices were originally patented in 1911 [2]. They are widely used to control the vibration of civil [3][4][5], marine [6] and aerospace [7][8][9] structures and can operate in different ways depending on the application. The first way of operating such a device aims to suppress the vibration only at a particular forcing frequency, in which case the devices natural frequency is tuned to this excitation frequency.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of dynamic vibration absorbers to minimise kinetic energy and maximise internal power dissipation

Zilletti¹,

Elliott²,

Rustighi³

2012

Journal of Sound and Vibration

114

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“…Depending on the type of excitation, optimum performance is achieved by either placing numerous lightweight absorbers in close proximity to a heavyweight absorber or distributing them in a scattered manner on the enclosure walls. On the contrary, a later work by the same group realized further noise reduction by mistuning the DVAs [Fuller et al, 2000]. Consistently, they indicated the influence of positioning the DVAs on optimum noise reduction, which is extended by Huang and Chen [2000] albeit the consideration of heavyweight absorbers is not included.…”

Section: Dynamic Vibration Absorbermentioning

confidence: 81%

Acoustic Metamaterials: A Potential for Cabin Noise Control in Automobiles and Armored Vehicles

Ang

Koh²,

Lee

2016

Int. J. Appl. Mechanics

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The aim of this paper is to provide an overview of the existing industrial practices used for cabin noise control in various industries such as automotive, marine, aerospace, and defense. However, emphasis is placed on automobiles and armored vehicles. Generally, automobile cabins usually constitute of thin structural panels, where the fundamental frequency typically falls below 200[Formula: see text]Hz. If a specific structural mode couples with a specific acoustic mode of the cabin, booming noise occurs. As such, discomfort may be felt by the occupants. Fundamentally, vibroacoustics problems may be minimized if the acoustic modes and the structural modes are decoupled, which is achieved usually by structural modifications or acoustical treatments. However, if excessively performed, the weight limitation of an automobile design will be exceeded; not to mention the adverse effect of increased weight on several factors such as fuel efficiency, mileage life of tires and acceleration of the vehicle. Moreover, current solutions have several drawbacks in low frequency noise control. In light of this, it is of great interest to explore the feasibility of acoustic metamaterials as an alternative with hope to improve cabin noise.

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Control of Aircraft Interior Noise Using Globally Detuned Vibration Absorbers

Cited by 49 publications

References 0 publications

Global Control of Vibration Using a Tunable Vibration Neutralizer

Global Control of Vibration Using a Tunable Vibration Neutralizer

Optimisation of dynamic vibration absorbers to minimise kinetic energy and maximise internal power dissipation

Acoustic Metamaterials: A Potential for Cabin Noise Control in Automobiles and Armored Vehicles

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