摘要
由液流阻尼器測試試驗結果，顯示遲滯圈會有偏斜的現象，此現象類似勁度效應，本文以考慮矽液之可壓縮性為出發點，建立一個新的液流阻尼器反應行為之數學模型，用以探討矽液之可壓縮性，與液流阻尼器遲滯圈偏斜的關聯性。
由探討之內容，可歸納出以下三個結論：
一、 液流阻尼器遲滯圈偏斜，也就是我們所謂的勁度效應，的確與矽液之可壓縮性具有密切關係，矽液所受之壓力與體積壓縮率之關係，對液流阻尼器遲滯圈之形狀，有非常大且直接的影響。
二、 在某一特定之液流阻尼器試驗中，就以理論推求之阻抗力而言，考慮矽液之可壓縮性比不考慮矽液之可壓縮性所求出之阻抗力與試驗數據比較之誤差，大約小 至 。
三、 假設流體為穩定層流，計算矽液流過孔隙之流量時，與試驗數據並不吻合，但可以常數性之修正係數予以線性修正之，此常數性之修正係數與頻率、振幅、液體種類、阻尼器尺寸…等因素有關。

Abstract
From the testing results of fluid dampers, it is observed that hysteresis loop can be tilted. This phenomena is similarly caused by the stiffness effect. Based on the compressibility of silicon glue, the goal of this article is to build a mathematical model of the fluid dampers, and to discuss the correlation between the compressibility of silicon glue and the result in the tilting of the hysteresis loop. The tilting of the hysteresis loop in fluid dampers,
Conclusions can be reached as follows:
1. The so-called stiffness effect, which causes the tilting of the hysteresis loop in fluid dampers is really closely related to the compressibility of silicon glue. The relation between the pressure of silicon glue and the rate of the volume being compressed influent directly over the shape of the hysteresis loop.
2. The error of the resisting force when compared to the experimental data can be reduced to 1/2 to 2/3 if the compressibility of the silicon glue is taken into account than that of incompressibility of the silicon glue is considered.
3. When calculating the volume of silicon glue to passing through the gap, the assumption that the liquid is a stable laminar flow does not agree with experimental figures. It needs to be verified by correction factor, which is recognized to be related with the factors such as frequency, amplitude, properties of the liquid and the size of the damper…etc.

參考文獻
1. Yang, J. N., “Overview of Protective System” ,橋樑隔減統應用研習會，台灣，pp.1-86.1996.
2. 李永峰，“結構液流阻尼器之設計及應用”，國立成功大學土木工程研究所碩士論文，民國八十六年六月。
3. 許伯銓，“液流阻尼器之特性分析及應用”，國立成功大學土木工程研究所碩士論文，民國八十八年六月。
4. 周尚儀，“液流阻尼器高頻特性之研究”，國立成功大學土木工程研究所碩士論文，民國八十八年六月。
5. 許文奕，“高強效液流阻尼器之研發”，國立成功大學土木工程研究所碩士論文，民國八十八年六月。
6. 毛壽彭，“流體力學”，pp.195-197,244-272，民國七十三年一月。.
7. 陳信元，“液流阻尼器物理特性之研究”，國立成功大學土木工程研究所碩士論文，民國九十年六月。
8. 張銘崑，“液壓學”，pp.87-88，民國八十四年五月三十日.
9. 王冠凱，“液流阻尼器全尺寸結構防振功能之振動台測試”，國立成功大學土木工程研究所碩士論文，民國九十一年六月。
10. 黃賜琳、“線性液流阻尼器阻尼係數之探討”，國立成功大學土木工程研究所碩士論文，民國九十一年六月。