TY - JOUR
T1 - A virtual acoustic black hole on a cantilever beam
AU - Quaegebeur, Samuel
AU - Raze, Ghislain
AU - Cheng, Li
AU - Kerschen, Gaëtan
N1 - Funding Information:
This work was supported by the Fonds de la Recherche Scientifique — FNRS, Belgium 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 ).
Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/6/23
Y1 - 2023/6/23
N2 - 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.
AB - 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.
KW - Acoustic black hole
KW - Active control
KW - Dynamic substructuring
KW - Vibration mitigation
UR - http://www.scopus.com/inward/record.url?scp=85151777989&partnerID=8YFLogxK
U2 - 10.1016/j.jsv.2023.117697
DO - 10.1016/j.jsv.2023.117697
M3 - Journal article
AN - SCOPUS:85151777989
SN - 0022-460X
VL - 554
JO - Journal of Sound and Vibration
JF - Journal of Sound and Vibration
M1 - 117697
ER -