Passive suppression of vortex-induced vibrations using a nonlinear energy sink—Numerical and analytical perspective

This study investigates the suppression mechanism of instabilities induced by fluid–structure interactions (FSI) using passive vibration absorption devices, such as nonlinear energy sink (NES). The present FSI framework comprises a low-order phenomenological model, wherein the wake effect is modeled...

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Vydané v:Mechanical systems and signal processing Ročník 182; s. 109556
Hlavní autori: Chirathalattu, Abraham Thomas, Santhosh, B., Bose, Chandan, Philip, Rony, Balaram, Bipin
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Elsevier Ltd 01.01.2023
Academic Press
Predmet:
Aerospace Engineering
Averaging technique
Civil and Structural Engineering
Complex averaging
Complexification
Computer Science Applications
Control and Systems Engineering
Engineering, computing & technology
Fluid-structure interaction
Ingénierie mécanique
Ingénierie, informatique & technologie
Mechanical Engineering
Nonlinear energy sink
Signal Processing
Slow flow
Slow invariant manifold
Slow invariant manifolds
Strongly modulated response
Targeted energy transfer
Targeted energy transfers
Vortex induced vibration
Nonlinear energy sink
Slow invariant manifold
Targeted energy transfer
Strongly modulated response
Complex averaging
ISSN:0888-3270, 1096-1216, 1096-1216
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Popis
Shrnutí:This study investigates the suppression mechanism of instabilities induced by fluid–structure interactions (FSI) using passive vibration absorption devices, such as nonlinear energy sink (NES). The present FSI framework comprises a low-order phenomenological model, wherein the wake effect is modeled using the classical Van der Pol oscillator. The structure is represented as a cylindrical bluff body with degree-of-freedom along the cross-flow direction. The response of the NES-augmented structure exhibits specific relaxation type oscillations, referred to as strongly modulated response (SMR), passively suppressing the high amplitude vortex-induced vibrations (VIV). The underlying mechanism of SMR is studied using an analytical approach based on the Complexification-Averaging (CXA) technique. Using the CXA technique, the slow flow for the coupled FSI system with the NES attachment is modeled effectively, revealing nonlinear beating regimes and initiation of the targeted energy transfer (TET) mechanism. Subsequently, a transient resonance capture, implying a significant energy transfer from the structure to the NES, results in effective VIV suppression. The occurrence of SMRs is explained by analyzing the global dynamics using the slow invariant manifold (SIM) derived from the slow flow of the coupled system. The resultant SIM topology reveals a jump phenomenon between the stable branches, wherein the flow jumps from a lower stable branch to a higher stable branch through SMR. The novelty of this study lies in identifying the occurrence of SMRs as the mechanism of energy transfer and uses the CXA technique to explain the global dynamics by modeling the SIM for the 3-DOF coupled FSI framework with the NES attachment. Furthermore, the optimal operational parameter ranges for an efficient NES design are identified through a parametric study using the slow-flow model. •Suppression of vortex-induced vibrations of a fluid–structure system using a nonlinear energy sink.•The suppression mechanism is revealed using the complexification-averaging technique.•The existence of strongly modulated responses is explained using the topology of the slow invariant manifold.•Optimal parameter space for the maximum suppression is determined using the slow flow model.
Bibliografia:scopus-id:2-s2.0-85135814796
ISSN:0888-3270
1096-1216
1096-1216
DOI:10.1016/j.ymssp.2022.109556