Tuned Liquid Damper with Porous Media

The tuned liquid damper filled with porous media is developed to promote an additional damping force for the conventional liquid dampers. Based on Darcy's law, the permeability of porous media and liquid viscosity form a damping force linearly proportional to fluid velocity. The equivalent mechanical models considering the damping due to porous media in are established. In contrast to the other operating TLDs with internal damping devices, the natural frequency and damping ratio of our TLD can be obtained without using empirical formulas.

The model was validated through impulsive and harmonic shaking-table experiments. The relationships between the equivalent damping ratio, wave amplitude, and ground displacement amplitude for the large-excitation cases are established to model the nonlinear damping effect. A modified mechanical model with a nonlinear damping mechanism is provided.

Project:
Theoretical Analysis, Numerical Method and Model Test of Porous Media Tuned Liquid Damper — funded by MOST of Taiwan (2019-2021)