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Structural Engineering and Mechanics
  Volume 25, Number 5, March30 2007, pages 541-564
DOI: http://dx.doi.org/10.12989/sem.2007.25.5.541
 


Energy balance and power demand assessment of actuators in base isolated structures supplemented with modified bang-bang control
Robert R. Sebastianelli, Jr. and Mark A. Austin

 
Abstract
    This paper investigates the feasibility of supplementing base isolation with active bang-bang control mechanisms. We formulate discrete approximations to energy-balance and power-demand equations for a base isolated structure supplemented with constant stiffness bang-bang (CKBB) control. Numerical experiments are conducted to: (1) Identify situations when constant stiffness bang-bang control is most likely to \"add value\" to system responses due to base isolation alone, and (2) Quantitatively determine the work done and power required by the actuators. A key observation from the numerical experiments is that \"overall performance\" of the actuators is coupled to \"input energy per unit time.\"
 
Key Words
    base isolation; bang-bang control; energy-based design.
 
Address
Dept. of Civil and Environmental Engineering, and Institute for Systems Research,University of Maryland, College Park, MD 20742, USA
 

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