FUZZY-LOGIC BASED VIBRATION SUPPRESSION CONTROL EXPERIMENTS ON ACTIVESTRUCTURES

This paper is concerned with the fuzzy-logic based vibration suppressi on control of active structures equipped with piezoelectric sensors an d actuators. The control methodology is based on the fuzzy logic contr ol of the variable structure system type. The sufficient condition for the closed-loop stability of the decentralized fuzzy control for the system equipped with collocated sensors and actuators is derived from the sufficient condition of the decentralized collocated variable stru cture system control. Hence, it is concluded that the fuzzy control is in fact the variation of the variable structure system control in thi s case. Comparison of the variable structure system to the fuzzy contr ol leads to a new fuzzy rule for the vibration suppression of the acti ve structure equipped with collocated sensors and actuators. It is sho wn that the fuzzy-logic control can be designed for the collocated sys tem without any knowledge of the system to be controlled. However, thi s may not be true in the case of multi-input and multi-output non-coll ocated systems. All the developments are demonstrated by means of a re al-time fuzzy control experiment on the cantilever beam with surface-b onded piezoceramic sensors and actuators. (C) 1996 Academic Press Limi ted