RESPONSE MITIGATION OF FLOATING PLATFORM BY POROUS-MEDIA TUNED LIQUID DAMPERS

Document Type

Conference Proceeding

Publication Date

1-1-2022

Abstract

A porous-media tuned liquid damper (PMTLD) can serve as an eco-friendly, economical, and effective dynamic vibration absorber. Placing porous media within a water tank can improve the capacity for energy dissipation and optimize the performance by varying its material properties. The numerical simulations of the floating platform dynamics in waves coupled with the sloshing problem in PMTLD are emphasized. Two numerical methods are adopted for fluid computation. The first potential-based approach employs a mixed-type boundary value problem (BVP) solver, which is implemented by the boundary element method (BEM), coupled with a free surface particle tracker, which includes the nonlinear damping effects via a quadratic Forchheimer term for PMTLD. Another equivalent mechanical model is also used exclusively for solving the linear PMTLD. The coupling behavior between fluid and structure is solved by the Newmark method. The second viscous approach uses the finite element method (FEM) to spatially discretize the Navier-Stokes equations and handles the free surface via the volume of fluid (VOF) and the level set (LS) equations. The multiphase simulation is implemented by a computational modeling toolkit Proteus for the fluid phase and Chrono for the solid phase. The correlations between potential flow and Navier-Stokes (NS) models are presented. The PMTLD is designed for a floating platform by analogy with the tuned mass damper (TMD). Numerical results show that the PMTLD can effectively reduce the structure’s dynamic response in terms of vibration amplitude around resonance. Such damping devices have great potential for practical applications in offshore platforms and wind turbine design.

Publication Source (Journal or Book title)

Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE

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