Fuzzy control of piezoelectric friction dampers for seismic protection of smart base isolated buildings |
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| Authors: | Osman E Ozbulut Stefan Hurlebaus |
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| Institution: | (1) Department of Civil Engineering and Geological Sciences, University of Notre Dame, Notre Dame, USA |
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| Abstract: | This study proposes two fuzzy logic controllers (FLCs) for operating control force of piezoelectric friction dampers used
for seismic protection of base-isolated buildings against various types of earthquake excitations. The first controller employs
a hierarchic control strategy in which a higher-level supervisory controller operates a single sub-level FLC by modifying
its input normalization factors in order to determine command voltage of the damper according to current level of ground motion.
The second controller is a self organizing FLC that employs genetic algorithms in order to build a knowledge base for the
fuzzy controller. Numerical simulations of a base-isolated building are conducted to evaluate the performance of the controllers.
For comparison purposes, an optimal controller is also developed and considered in the simulations together with maximum passive
operation of the friction damper. Results for several historical ground motions show that developed fuzzy logic controllers
can effectively reduce isolation system deformations without the loss of potential advantages of seismic base isolation. |
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