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Critical roles of mass, spring, and damping ratios in nonlinear energy sink vortex-induced vibrational control: CFD & optimization

Year: 2025
Type: article
Abstract: Vortex-induced vibration (VIV) poses significant challenges in engineering. Structures subjected to fluid flows necessitate effective suppression mechanisms to avoid vibrations. This study investigates the ability of a nonlinear energy sink (NES) system to reduce VIV under a variety of reduced velocities ( U r ). Over 3 , 000 scenarios were examined to assess the impact of NES properties; mass ratio ( β = 0.01 − 0.5 ), spring ratio ( γ = 0.01 − 2.0 ), and damping ratio ( ξ = 0.01 − 2.0 ) on the vibrational response of structures using computational fluid dynamics (CFD) simulations utilizing Reynolds-averaged Navier–Stokes ( R A N S ) turbulence models. The numerical simulations were validated using experimental data demonstrating excellent agreement with the literature. Vibrational contour maps were developed from the CFD predictions over a wide range of U r , β , γ , a n d ξ . Our findings indicate that the process of tuning the NES parameters (β, γ, and ξ) can either diminish vibrational amplitudes ( A y / D ), or if not carefully optimized, can amplify them. With optimal NES parameter tuning, an amplitude reduction of 94 % was found to be possible. Furthermore, Sobol sensitivity analysis was performed, which revealed that while A y / D highly depends on U r , proper tuning of the β in combination with γ is critical, especially in regimes where parameter interactions become significant. While global optimization is challenging, it is recommended that the optimized NES parameters for the lock-in region differ from those for the lower-branch vibration region.
DOI: 10.1016/j.apor.2025.104852
Language: English
Open Access status: gold
Estimated APC paid: $2,950
OpenAlex ID: W4416105706
FWCI:
Cites: 20
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