Modeling and experimental verification of a variable-stiffness isolation system using a leverage mechanism

Lyan Ywan Lu, Shih Yu Chu, Shih Wei Yeh, Chih Hua Peng

研究成果: Article同行評審

13 引文 斯高帕斯(Scopus)


Recent studies have discovered that conventional isolation systems may incur excessive isolator displacement in a near-fault earthquake with strong long-period wave components. To overcome this problem without jeopardizing isolation efficiency, a novel semi-active isolation system called a Leverage-type Variable Stiffness Isolation System (LVSIS) is realized in this study. By utilizing a simple leverage mechanism, the isolation stiffness of the LVSIS can be easily controlled by adjusting the position of the pivot point on the leverage arm. For accurate analysis, the dynamic equation based on a mathematical model that considers the actual situation of all friction forces within the LVSIS is derived in the study. The mathematical model is then verified experimentally by using a prototype LVSIS tested dynamically on a shaking table. Furthermore, to determine the on-line pivot position of the LVSIS, this study also proposes a semi-active control law whose feedback gain is decided by utilizing a linear active control algorithm, such as the LQR or modal control. By comparing the isolation performance of its uncontrolled passive counterpart, the test results also demonstrate that the LVSIS with the proposed control law is especially effective in suppressing the excessive base displacement induced by a near-fault earthquake.

頁(從 - 到)1869-1885
期刊JVC/Journal of Vibration and Control
出版狀態Published - 2011 10月

All Science Journal Classification (ASJC) codes

  • 材料力學
  • 機械工業
  • 航空工程
  • 一般材料科學
  • 汽車工程


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