Geology Reference
In-Depth Information
Chapter 13
Nonlinear Structural Control
Using Magnetorheological
Damper
Shaikh Faruque Ali
Swansea University, UK
Ananth Ramaswamy
Indian Institute of Science, India
ABSTRACT
This chapter provides an introduction to semi active control of base isolated buildings using magne-
torheological (MR) dampers. Recently developed nonlinear control algorithms are discussed. First a
fuzzy logic control (FLC) is designed to decide how much voltage is required to be supplied to the MR
damper for a desired structural response. The FLC is optimized using micro genetic algorithm. A novel
geometric approach is developed to optimize the FLC rule base. Experiments are undertaken to access the
efficacy of the optimal FLC. Secondly the chapter develops two model based control algorithms based on
dynamic inversion and integrator backstepping approaches. A three storey base isolated building is used
for experimental and numerical studies. A numerical comparison is shown with clipped optimal control.
INTRODUCTION
The consequences of their failure are catastrophic.
Devastations in the past and recent earthquakes
have shown that the understanding of building
physics under seismic motion has increased
which has improved the design of building and
international building codes too. But we are still
Civil engineering structures, e.g., tall buildings,
long span bridges, deep water offshore platforms,
nuclear power plants, etc., have become more
costly, complex and serve more critical functions.
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