A virtual acoustic black hole on a cantilever beam

Quaegebeur, Samuel; Raze, Ghislain; Cheng, Li; Kerschen, Gaëtan

doi:10.1016/j.jsv.2023.117697

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A virtual acoustic black hole on a cantilever beam

Quaegebeur, Samuel; Raze, Ghislain; Cheng, Li et al.

2023 • In Journal of Sound and Vibration, 554, p. 117697

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/301487

DOI
10.1016/j.jsv.2023.117697

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Keywords :

Acoustic black hole; Active control; Vibration mitigation; Dynamic substructuring

Abstract :

[en] An acoustic black hole (ABH) consists of a tapered structure whose thickness follows a power-law profile. When attached to a host structure, an ABH localizes and traps the vibrational energy, which can then be dissipated through, e.g., a damping layer. However, effective vibration mitigation is known to occur only above a cut-on frequency which is inversely proportional to the length of the tapered structure. In this context, the main thrust of this paper is to replace a mechanical ABH by a digital controller so as to create a so-called virtual acoustic black hole (VABH), thus, freeing the ABH from possible mechanical constraints (e.g., compactness, manufacturing and fatigue issues). The proposed VABH is first detailed theoretically. The salient features and performance of the VABH are then demonstrated both numerically and experimentally using a cantilever beam as a host structure. Eventually, it is shown that the VABH significantly enlarges the applicability of the concept of an ABH.

Disciplines :

Mechanical engineering
Aerospace & aeronautics engineering
Engineering, computing & technology: Multidisciplinary, general & others

Author, co-author :

Quaegebeur, Samuel ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux

Raze, Ghislain ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux

Cheng, Li ; The Hong Kong Polytechnic University > Department of Mechanical Engineering

Kerschen, Gaëtan ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux

Language :

English

Title :

A virtual acoustic black hole on a cantilever beam

Publication date :

23 June 2023

Journal title :

Journal of Sound and Vibration

ISSN :

0022-460X

eISSN :

1095-8568

Publisher :

Elsevier BV

Volume :

554

Pages :

117697

Peer reviewed :

Peer Reviewed verified by ORBi

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]

Funding number :

PDR T.0124.21

Funding text :

This work was supported by the Fonds de la Recherche Scientifique - FNRS under Grant no. [FRS-FNRS PDR T.0124.21], which is gratefully acknowledged. Li Cheng also thanks the support from the Research Grant Council of the Hong Kong SAR (PolyU 152023/20E).

Available on ORBi :

since 05 April 2023

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