Affiliations: Department of Civil Engineering, Indian Institute of
Technology Bombay, Mumbai, India
Note: [] Corresponding author: N.K. Chandiramani, Professor, Department
of Civil Engineering, Indian Institute of Technology Bombay, Powai, Mumbai
400076, India. Tel.: +91 22 25767311; Fax: +91 22 25767302; E-mail:
[email protected]
Abstract: Control of seismic response of a building fitted with
magnetorheological dampers is considered using Optimal Static Output Feedback
(OSOF) for desired damper forces. The Modified Bouc-Wen damper model is used
and two control voltage laws based on the MR constraint filter, i.e.,
Semi-inverse Quadratic Voltage Law and Semi-inverse On-Off Voltage Law, are
proposed. These appear to perform at least as well as an existing Clipped
Voltage Law. Comparisons with available results from a robust reliability-based
controller show OSOF control to be quite effective. Controlled response using
OSOF is compared with Linear Quadratic Guassian (LQG) and passive-on
controllers. Moderate to substantial reduction in maximum peak/RMS responses is
mostly obtained with base configuration of sensors when using OSOF control, and
controller CPU time reduces by two orders of magnitude. Parametric studies
regarding sensor configuration and state/control weighting matrices are
performed in order to obtain effective control. Effective OSOF control requires
drift feedback with drift sensor preferably collocated with damper.
Keywords: Optimal control, output feedback, MR damper, Bouc-Wen model
