Visualization of travelling waves propagating in a plate equipped with 2D ABH using wide-field holographic vibrometry

Lagny, Laure; Secail-Geraud, Mathieu; Meur, Julien Le; Montrésor, Silvio; Heggarty, Kevin; Pézerat, Charles; Picart, Pascal

doi:10.1016/j.jsv.2019.114925

Cited by 27 publications

(13 citation statements)

References 46 publications

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“…Experimental evidence of ABH effect using a variety of beam-like and plate-like structures are also numerous [6,[10][11][12][13]. Recent analytical advances for the exact solutions of ABHs in beam structures are shown in [14], and the numerical and experimental contributions that aims at optimizing the design of ABHs for vibration suppression have been discussed in [15][16][17][18][19] for various structures. In addition, applications of ABH to other areas, including elastic metastructures [20], energy harvesting [21], vibro-impact systems [22] and cochlear systems, have also been investigated.…”

Section: Introductionmentioning

confidence: 99%

Combining nonlinear vibration absorbers and the Acoustic Black Hole for passive broadband flexural vibration mitigation

Touzé

Pelat

et al. 2021

International Journal of Non-Linear Mechanics

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The Acoustic Black Hole (ABH) effect refers to a special vibration damping technique adapted to thin-walled structures such as beams or plates. It usually consists of a local decrease of the structure thickness profile, associated to a thin viscoelastic coating placed in the area of minimum thickness. It has been shown that such structural design acts as an efficient vibration damper in the high frequency range, but not at low frequencies. This paper investigates how different types of vibration absorbers, linear and nonlinear, added to the primary system can improve the low frequency performance of a beam ABH termination. In particular, the conjugated effects of the Acoustic Black Hole effect and a Tuned Mass Damper (TMD), a Nonlinear Energy Sink (NES), a bi-stable NES (BNES), and a vibro-impact ABH (VI-ABH) are investigated. Forced response to random excitation are computed in the time domain using a modal approach combined with an energy conserving numerical scheme. Frequency indicators are defined to characterize and compare the performance of all solutions. The simulation results clearly show that all the proposed methods are able to damp efficiently the flexural vibrations in a broadband manner. The optimal tuning of each proposed solution is then investigated through a thorough parametric study, showing how to optimize the efficiency of each solution. In particular, TMD and VI-ABH show a slight dependence on vibration amplitude, while the performance of NES and BNES have a peak of efficiency for moderate amplitudes.

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Section: Introductionmentioning

confidence: 99%

Combining nonlinear vibration absorbers and the Acoustic Black Hole for passive broadband flexural vibration mitigation

Touzé

Pelat

et al. 2021

International Journal of Non-Linear Mechanics

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“…The clean phase is shown in Figure 2g, the noisy phase is shown in Figure 2h, and the noisy phase obtained is shown in Figure 2i. The experimental setup and methodology to obtain such phase images is described in References [3,4]. The reader is invited to have a look at these papers for further details.…”

Section: Dataeval Databasementioning

confidence: 99%

“…Phases must be unwrapped in order to access the physical kinematic quantities of an object [2]. For example, digital holography permits us to investigate complex acoustic phenomena by using the method of ultra-fast digital holography with a sampling rate up to 100 kHz [3][4][5]. Regarding image de-noising, algorithms are generally designed with the assumption of additive Gaussian noise and there is a real need for new de-noising approaches able to cope with speckle noise and complex fringe patterns.…”

Section: Introductionmentioning

confidence: 99%

Towards Reduced CNNs for De-Noising Phase Images Corrupted with Speckle Noise

2021

Self Cite

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Digital holography is a very efficient technique for 3D imaging and the characterization of changes at the surfaces of objects. However, during the process of holographic interferometry, the reconstructed phase images suffer from speckle noise. In this paper, de-noising is addressed with phase images corrupted with speckle noise. To do so, DnCNN residual networks with different depths were built and trained with various holographic noisy phase data. The possibility of using a network pre-trained on natural images with Gaussian noise is also investigated. All models are evaluated in terms of phase error with HOLODEEP benchmark data and with three unseen images corresponding to different experimental conditions. The best results are obtained using a network with only four convolutional blocks and trained with a wide range of noisy phase patterns.

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“…The ABH literature today, as in March 2020, consists of around a hundred peer reviewed journal papers (in addition to numerous conference papers), among them 40 papers have been published in the Journal of Sound and Vibration (JSV). This Virtual Special Issue of JSV includes 11 papers listed below as references [1][2][3][4][5][6][7][8][9][10][11]. For convenience of the readers, references to other ABH papers published in JSV, that are not part of this VSI, are also provided in the same Reference List as references .…”

mentioning

confidence: 99%

“…A new method for wide-field vibrometry based on high-speed digital holographic interferometry is presented in paper [9]. Using this method, experimental investigation of travelling acoustic waves propagating in alloy plate equipped with a two-dimensional ABH is considered.…”

mentioning

confidence: 99%

Special issue: Recent advances in Acoustic Black Hole research

Gautier

Krylov

2020

Journal of Sound and Vibration

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Reduction of undesirable structural vibrations and of the associated structure-borne noise is a classical problem that remains important today. There are many ways of passive damping of structural vibrations. Unfortunately, most of them require addition of substantial amounts of damping materials, which is not always possible because of the mass and volume restrictions associated with structures' operational requirements. In this connection, development of new methods of vibration damping is always desirable, especially if they can avoid the mass or volume penalty. Among such new methods are those based on the Acoustic Black Hole effect (ABH), which is a topic of increasing interest in the vibroacoustic and noise control communities. In the majority of practical situations, this innovative technique for reduction of structural vibrations and of the associated noise is based on the propagation properties of flexural (bending) waves in thin structures of variable thickness. If a local thickness of a structure changes with wave propagation distance quickly enough, then such a structure may result in trapping the vibrations in the area of progressively decreasing thickness, in which a small patch of viscoelastic coating is sufficient to dissipate the localized energy very efficiently.The scientific literature on this subject has grown rapidly in recent years. In particular, a large number of research papers have been published in leading international journals

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Visualization of travelling waves propagating in a plate equipped with 2D ABH using wide-field holographic vibrometry

Cited by 27 publications

References 46 publications

Combining nonlinear vibration absorbers and the Acoustic Black Hole for passive broadband flexural vibration mitigation

Combining nonlinear vibration absorbers and the Acoustic Black Hole for passive broadband flexural vibration mitigation

Towards Reduced CNNs for De-Noising Phase Images Corrupted with Speckle Noise

Special issue: Recent advances in Acoustic Black Hole research

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