Development and Application of Vibration Isolation System with Adaptive Stiffness Considering Potential Energy
|關鍵字:||勁度可變;隔震系統;結構控制;半主動控制;Potential energy;Semi-active control;near-fault earthquake;LSCIS|
In recent years, a study of semi-active isolation system named Leverage-type Stiffness Controllable Isolation System (LSCIS) was proposed. The main concept of the LSCIS is to adjust the stiffness in the isolator for the fundamental period of the superstructure by a simple leverage mechanism. Although great performance has been achieved with the support of an algorithm considering the least input energy in far-field earthquakes, some result still reveal that the proposed system is not suitable in application for near-fault strong ground motion. To overcome this problem, an upgraded algorithm is proposed by considering the potential energy effect in the semi-active structural control system in this study. Firstly, the new algorithm is developed with the combination of the potential energy and the kinetic energy as the control objective to reduce the structural displacement responses efficiently. The optimal weightings between the potential and kinetic energy are then determined through a series of near-fault earthquake simulation. In order to demonstrate the performance of the proposed algorithm, a single-degree-of-freedom structure is used as a benchmark in both numerical simulation and experimental verification. The results have shown that the dynamic response of the structure can be effectively alleviated by the proposed algorithm under both far-field and near-fault earthquakes, while the structural responses by the original algorithm may be worse than the pure passive control. The feasibility of implementing the proposed system has also been experimentally verified.
|Appears in Collections:||Thesis|