具多孔材質之諧調液體阻尼器之特性研究

Study on Tuned Liquid Dampers with Porous Media

黃豊翔(Li-Hsiang Huang)

指導教授 ： 黃維信

國立臺灣大學/工學院/工程科學及海洋工程學研究所/碩士(2019年)

https://doi.org/10.6342/NTU201903322

摘要

本文研究具多孔材質之液體阻尼器的沖激行為，並以實驗的方式驗證理論的可靠性。假設流場為非旋性場及不可壓縮流，使得流場的速度勢滿足拉普拉斯方程式，並假設流場內的消能機制滿足達西定律，邊界條件為不可穿透性及自由液面的運動及動力條件，進而求解出暫態及穩態的速度勢。接下來建立阻尼器的等效模型，以方便分析阻尼器的動力行為。實驗方面，分別以衝擊及簡諧運動的方式驗證暫態及穩態的動力與水波特性。

關鍵字

沖激 ； 勢流理論 ； 諧調液體阻尼器 ； 多孔材質 ； 等效機械系統

並列摘要

The objective of the present thesis is to investigate the characteristics of tuned liquid dampers (TLD) with porous media. Assume that the flow in a tank is irrotational, incompressible and the damping force is proportional to fluid velocity based on Darcy’s law. TLDs with porous media represent the equivalent mechanical system that produces the equivalent forces developed by the sloshing fluid. The experimental studies involve impulse and sinusoidal excitations based on natural frequencies. Also, the energy dissipation has been studied.

並列關鍵字

Sloshing ； Potential flow theory ； Tuned Liquid Dampers ； Porous Media ； Equivalent Mechanical System

參考文獻

Abbaspour M, Hassanabad MG, “Comparing Sloshing Phenomena in a Rectangular Container with and without a Porous Medium Using Explicit Nonlinear 2-D BEM-FDM,” Scientia Kranica Trans. B-Mech. Eng. 17, pp. 93-101, 2010.

Carman PC, Flow of Gases Through Porous Media, Academic Press, 1956.

Chang PM, Lou JYK, Lutes LD, “Model identification and control of a tuned liquid damper,” Engineering Structures. 20(3), pp. 155-163, 1998.

Clough RW, Penzien J, Dynamic of Structures, McGraw-Hill, 1993.

Currie IG, Fundamental mechanics of fluids, CRC Press, 2003.