Physics-based reduced-order modeling and experimental verification of a nonlinear porous-media tuned liquid damper for seismic vibration control
Journal
Ocean Engineering
Journal Volume
337
Start Page
121905
ISSN
0029-8018
Date Issued
2025-10
Author(s)
Abstract
Placing porous media in a water tank enhances the damping capacity of a tuned liquid damper (TLD) without bringing a mistuning effect, thereby enabling optimal structural vibration control. A physics-based reduced-order model (ROM) based on potential flow theory is developed for the porous-media tuned liquid damper (PMTLD). The nonlinear damping resulting from fluid sloshing within the porous medium is modeled using the Darcy-Forchheimer flow. Damping characteristics under harmonic excitations are quantified through free-decay and energy-loss methods, and a quadratic approximation is employed to relate the time-dependent damping ratio to the sloshing wave elevation. This approach reduces computational complexity by lowering the degrees of freedom associated with sloshing. The ROM is validated through shaking-table experiments of a PMTLD mounted on a single-degree-of-freedom (SDOF) pendulum under harmonic excitations. The optimal design of the PMTLD is verified through experimental measurements of displacement and acceleration frequency responses of the pendulum subjected to harmonic ground excitations at and near resonance. The PMTLD's effectiveness in mitigating structural vibrations due to seismic excitations is evaluated in both time and frequency domains. The phase response, energy transfer, and damping mechanism during excitation are also illustrated.
Subjects
Nonlinear sloshing damping
Porous media
Reduced-order model
Structural vibration control
Tuned liquid damper
SDGs
Publisher
Elsevier BV
Type
journal article