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Smart Structures and Systems
  Volume 8, Number 5, November 2011 , pages 501-524

Experiment of an ABS-type control strategy for semi-active friction isolation systems
Lyan-Ywan Lu, Ging-Long Lin and Chen-Yu Lin

    Recent studies have discovered that a conventional passive isolation system may suffer from an excessive isolator displacement when subjected to a near-fault earthquake that usually has a long-period velocity pulse waveform. Semi-active isolation using variable friction dampers (VFD), which requires a suitable control law, may provide a solution to this problem. To control the VFD in a semi-active isolation system more efficiently, this paper investigates experimentally the possible use of a control law whose control logic is similar to that of the anti-lock braking systems (ABS) widely used in the automobile industry. This ABS-type controller has the advantages of being simple and easily implemented, because it only requires the measurement of the isolation-layer velocity and does not require system modeling for gain design. Most importantly, it does not interfere with the isolation period, which usually decides the isolation efficiency. In order to verify its feasibility and effectiveness, the ABS-type controller was implemented on a variable-friction isolation system whose slip force is regulated by an embedded piezoelectric actuator, and a seismic simulation test was conducted for this isolation system. The experimental results demonstrate that, as compared to a passive isolation system with various levels of added damping, the semi-active isolation system using the ABS-type controller has the better overall performance when both the far-field and the near-fault earthquakes with different PGA levels are considered.
Key Words
    anti-lock braking system; ABS system; shaking table test; seismic isolation; semi-active control; variable friction damper; piezoelectric actuator; near-fault earthquake.
Lyan-Ywan Lu : Department of Construction Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung, Taiwan
Ging-Long Lin : Department of Civil Engineering, National Chung Hsing University, Taichung, Taiwan
Chen-Yu Lin: National Center for Research on Earthquake Engineering, Taipei, Taiwan

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