Earticle

In this paper we have discussed the development of a new approach for small low cost helicopter based UAV in which independency of control system is achieved and other features like power enhancement, development, flight of helicopter at fix altitude of highly cost effective, autonomous reconnaissance UAV, suitable for safe flights in close environments . Our approach is focused on development of reliable flight control system in which constituent subsystem are independent of each other. The constituent subsystems being,  Altitude Control Subsystem  Spin Lock Subsystem  Horizontal Drift Control Subsystem Auto Pilot, Helicopter, UAV, Independent Control Systems, Fix Altitude, Cost Effective UAV

This study introduces delay independent decentralized guaranteed cost control design method based on two controller structures for nonlinear uncertain interconnected large scale systems with time delays. First, a set of equivalent Takagi-Sugeno (T-S) fuzzy models are extended to represent the systems. Then a decentralized state-feedback guaranteed cost performance controller is proposed for the fuzzy systems. Based on delay independent Lyapunov functional approach, some sufficient conditions for the existence of the controller can be cast into the feasible problem of LMIs irrespective of the sizes of the time delays so that the system can be asymptotically stabilized for all considered uncertainties whose sizes are not larger than their bounds. Finally, the minimizing approach is proposed to search the suboptimal upper bound value of guaranteed cost function. Moreover, the corresponding conditions are extended into the generalized dynamic output-feedback close-loop system. Finally, the better control performances of the proposed methods are shown by the simulation examples.