Experimental evidence of energy pumping in acoustics

Cochelin, Bruno; Herzog, Philippe; Mattei, Pierre‐Olivier

doi:10.1016/j.crme.2006.08.005

Cited by 56 publications

(41 citation statements)

References 5 publications

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“…In the field of structural vibration, a wide variety of NES designs with different types of stiffness (cubic , non-polynomial, non-smooth nonlinearities...) has been proposed [4,5,6,7]. In the acoustic field, to the best of our knowledge only one type of vibro-acoustic NES design has been tested, see the series of papers [8,9,10,11,12]. It was demonstrated that a 20 passive control of sound at low frequency can be achieved using a vibroacoustic coupling between the acoustic field (the primary system) and a geometrically nonlinear thin clamped structure (the NES).…”

Section: Strongly Modulated Responses (Smr)[3]mentioning

confidence: 99%

“…It was demonstrated that a 20 passive control of sound at low frequency can be achieved using a vibroacoustic coupling between the acoustic field (the primary system) and a geometrically nonlinear thin clamped structure (the NES). In [8,9,12], the thin baffled structure consists of a simple thin circular latex (visco-elastic) membrane whereas in [10] a loudspeaker used as a suspended piston is considered. In both cases, the 25 thin baffled structure has to be part of the frontier of the closed acoustic domain (to be controlled).…”

Section: Strongly Modulated Responses (Smr)[3]mentioning

confidence: 99%

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Experimental study of a hybrid electro-acoustic nonlinear membrane absorber

Bryk

Bellizzi

Côte

2018

Journal of Sound and Vibration

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A hybrid electro-acoustic nonlinear membrane absorber working as a nonlinear energy sink (here after named EA-NES) is described. The device is composed of a thin circular visco-elastic membrane working as an essentially cubic oscillator. One face of the membrane is coupled to the acoustic field to be reduced and the other face is enclosed. The enclosure includes a loudspeaker for the control of the acoustic pressure felt by the rear face of the membrane through proportional feedback control. An experimental set-up has been developed where the EA-NES is weakly coupled to a linear acoustic system. The linear acousticsystem is an open-ended tube, coupled on one side to the EA-NES by a box, and on the other side to a source loudspeaker by another box. Only sinusoidal forcing is considered. It is shown that the EA-NES is able to perform resonance capture with the acoustic field, resulting in noise reduction by targeted energy transfer, and to operate in a large frequency band, tuning itself passively to any linear system. We demonstrate the ability of the feedback gain defining the active loop to modify the resonance frequency of the EA-NES, which is a key factor to tune the triggering threshold of energy pumping. The novelty of this work is to use active control combined to passive nonlinear transfer energy to improve it. In this paper, only experimental results are analyzed.

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Section: Strongly Modulated Responses (Smr)[3]mentioning

confidence: 99%

Section: Strongly Modulated Responses (Smr)[3]mentioning

confidence: 99%

Experimental study of a hybrid electro-acoustic nonlinear membrane absorber

Bryk

Bellizzi

Côte

2018

Journal of Sound and Vibration

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“…A series of papers [1,2,3,4] demonstrated that a passive control of sound at low frequencies can be achieved using a vibroacoustic coupling between the acoustic field (the primary system) and a geometrically nonlinear thin baffled structure (the nonlinear absorber). In [1,2], the thin baffled structure consists of a simple thin circular visco-elastic membrane whereas in [3,4] a loudspeaker used as a suspended piston is considered.…”

Section: Introductionmentioning

confidence: 99%

“…In [1,2], the thin baffled structure consists of a simple thin circular visco-elastic membrane whereas in [3,4] a loudspeaker used as a suspended piston is considered. In the four papers, theoretical and experimental results are reported considering transient and periodic external excitation.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, an acoustic medium (as in [1,2,3,4]) is considered as a primary system coupled to a simple thin circular visco-elastic membrane (as in [1,2]). However, two significant differences can be highlighted from these past studies: firstly, the acoustic medium is modeled using two modes and secondly the coupling effect between the primary system and the NES is analyzed under two different harmonic excitations.…”

Section: Introductionmentioning

confidence: 99%

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Responses of a two degree-of-freedom system coupled to a nonlinear damper under multi-forcing frequencies

Bellizzi

Côte

Pachebat

2013

Journal of Sound and Vibration

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In this paper, forced responses are investigated in a two degree-of-freedom linear system with a linear coupling to a Nonlinear Energy Sink (NES) subjected to quasi-periodic excitation. The quasi-periodic regimes associated to quasi-periodic forcing in the regime of 1:1-1:1 are studied analytically using the complexification method combined to the averaging method in terms of multi-time parameter. Local bifurcations of the quasi-periodic regimes are also analyzed using the excitation frequencies as control parameters. The nonlinear differential system is also solved numerically in time domain and the responses are analyzed in view of the analytical results. Stable and unstable quasi-periodic responses are found in good agreement with the analytical study, and strongly modulated responses are noticed. We observe that a single NES can be efficient for the reduction of two resonance peaks even if they are well separated, incommensurable, and excited simultaneously.

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Numerical and experimental study of the performance of a single‐sided vibro‐impact track nonlinear energy sink

Wang

Wierschem

Spencer

et al. 2015

Earthq Engng Struct Dyn

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Summary This paper proposes a single‐sided vibro‐impact track nonlinear energy sink (SSVI track NES) as an effective way to mitigate the effects of impulsive and seismic excitation on building structures. The SSVI track NES is a passive energy dissipation device, which consists of a mass moving along a track, the shape of which provides a nonlinear restoring force to the mass. Previous studies have analyzed the track NES, which considers the track shape to be smooth and symmetric. By introducing a discontinuity into the shape of the track (e.g., through impact), energy in the primary structure can be scattered to higher frequency responses where it can be dissipated at a faster rate. First, the SSVI track NES is analytically investigated and numerically optimized base on a two degree‐of‐freedom primary structure. The results of numerical simulations show that the SSVI track NES can be more efficient than both the track NES and tuned mass damper in reducing the response of the primary structure. Based on the analytical studies, the SSVI track NES is experimentally realized and investigated when subjected to both impulse‐like and seismic excitations, confirming the numerical predictions and validating the analytical model of the device. Finally, the robustness of the SSVI track NES is investigated numerically. The results of this investigation indicate that the SSVI track NES remains effective over a broad range of input excitation energy levels, as well as during significant changes in the stiffness of the primary structure. Copyright © 2015 John Wiley & Sons, Ltd.

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Experimental evidence of energy pumping in acoustics

Cited by 56 publications

References 5 publications

Experimental study of a hybrid electro-acoustic nonlinear membrane absorber

Experimental study of a hybrid electro-acoustic nonlinear membrane absorber

Responses of a two degree-of-freedom system coupled to a nonlinear damper under multi-forcing frequencies

Numerical and experimental study of the performance of a single‐sided vibro‐impact track nonlinear energy sink

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