Seismic Vibration Control of Structural System using Interval Type2 Fuzzy Logic Controller and genetically tuned PID Controller Seismic Vibration Control of Structural System using Interval Type2 Fuzzy Logic Controller and genetically tuned PID Controller

In this paper, the problem of active vibration control of multi-degree-of-freedom structures is considered. Interval Type2 Fuzzy logic and genetically tuned PID controllers are designed to suppress structural vibrations against earthquakes under the non-linear soil-structure interaction. The advantage of the interval type2 fuzzy logic approach is the ability to handle the non-linear behavior of the system. Non-linear behavior of the soil is modeled in the dynamics of the structural system with non-linear hysteric restoring forces. One of the main shortcomings of the type-1 fuzzy systems is their inability to consider uncertainty in fuzzy rules. IT2FLS has the ability to handle this problem. The IT2FLC is designed for getting the maximum response reduction under different types of earthquake excitations. A structural system was simulated against the ground motion of the destructive Gadha earthquake (Mw = 6.9) in Jabalpur, India on 21 May 1997. At the end of the study the time history of the storey displacements and accelerations and the frequency responses of both the uncontrolled and the IT2FLC based controlled structures are presented. These results show that the proposed interval type2 fuzzy logic controller and genetically tuned PID controller has great potential in active structural control.