When a strong earthquake occurs, many buildings are destroyed. For the inhabitants of such buildings, having sufficient time to take refuge is critical. This study presents the basic concept of a control system for stabilizing a plastic-deformed building by jetting out compressed gas while the inhabitants escape. This system features easy installation. Constant pressure gas is employed, and is controlled to jet or to stop jetting. The plastic-deformed building is modeled as a two-link inverted pendulum, and the design of the stabilizing controller is based on the sliding mode control theory. The validity of the system is confirmed by numerical simulations and model experiments. The results indicate that (1) an unstable structure can be stabilized by air jet pulses, (2) a robust bang-bang type controller can be derived by designing the switching surface to have an equivalent control input equal to zero, and (3) chattering of the control input is suppressed by setting an insensitive zone.
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February 2004
Technical Papers
Stabilization of a Plastic-Deformed Structure by Air Jet Pulse
Takeshi Kawashima
e-mail: kawasima@sd.kanagawa-it.ac.jp
Takeshi Kawashima
Kanagawa Institute of Technology, Department of System Design Engineering, 1030 Shimo-Ogino, Atsugi-city, Kanagawa, 243-0292, Japan
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Takeshi Kawashima
Kanagawa Institute of Technology, Department of System Design Engineering, 1030 Shimo-Ogino, Atsugi-city, Kanagawa, 243-0292, Japan
e-mail: kawasima@sd.kanagawa-it.ac.jp
Contributed by the Pressure Vessels and Piping Division for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received by the PVP Division November 8, 2002; revision received May 21, 2003. Associate Editor: G. C. Slagis.
J. Pressure Vessel Technol. Feb 2004, 126(1): 148-154 (7 pages)
Published Online: February 26, 2004
Article history
Received:
November 8, 2002
Revised:
May 21, 2003
Online:
February 26, 2004
Citation
Kawashima, T. (February 26, 2004). "Stabilization of a Plastic-Deformed Structure by Air Jet Pulse ." ASME. J. Pressure Vessel Technol. February 2004; 126(1): 148–154. https://doi.org/10.1115/1.1636788
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