High performance direct torque control of electrical aerodynamics load simulator using fractional calculus

Abstract

Electrical load simulator system (ELSS) is a test rig used to apply medium range aerodynamics loads on flight actuation system in real time experiments. A novel high performance fractional order adaptive robust torque control law is proposed for Electrical Load Simulator which is subjected to extra torque disturbance, friction, and parametric uncertainties. Adaptive fuzzy system is used to estimate extra torque disturbance and parametric uncertainty is estimated using discontinuous projection based adaptive control. A friction observer is used to compensate nonlinear friction. Stability of closed loop is derived using Lyapunov method.The proposed method ensures transient performance of ELSS system subjected to none zero initial conditions. Frequency testing and extra torque elimination tests are performed using PID, integer order sliding mode control and the proposed controller. The efficiency of proposed controller is verified using extensive numerical simulations.