多孔材質諧調液體阻尼器之非線性動力行為實驗研究

Abstract

本文研究針對具有不鏽鋼製多孔材質之液體阻尼器的沖激行為，透過實驗對理論進行驗證。以多孔材質於總水深高度的占比為主要變因，將容器內之流場依照多孔材質的有無區，分為兩個流體子域進行分析，討論多孔材質對兩個子域內之流體的物理特性與動力響應的影響，實驗透過振動台輸出衝擊波以及不同強制振幅與頻率之簡諧波，透過影像辨識獲得槽壁之波高歷時與透過荷重元等儀器獲得液體衝擊力歷時，並利用所獲之數據分析系統的暫態與穩態響應，以此探討系統的動力特性，期望當多孔材質占比下降的同時，仍能兼顧有效的阻尼效果，藉以提升多孔材質諧調液體阻尼器系統之工程經濟價值。

This study investigates the sloshing behavior of a liquid damper equipped with stainless steel porous media, aiming to validate the theoretical framework through experimental methods. The primary variable is the proportion of the porous media relative to the total water depth. The internal flow field of the container is divided into two fluid subdomains, regions with and without porous media, for separate analysis. In order to discuss the influence of the porous media on the physical characteristics and dynamic responses of the fluids in both subdomains. Experiments are conducted using a shaking table to generate impulsive waves as well as harmonic waves of varying amplitudes and frequencies. Wave elevation histories along the container wall are obtained via image recognition techniques, while fluid impact force time histories are recorded using load cells and other sensors. In this way, the impulsive and steady-state responses of the system can be determined and used to analyze its dynamic characteristics. The objective is to ensure effective damping performance even as the volume fraction of porous media is reduced, thereby enhancing the overall engineering and economic value of the system.。