TY  - JOUR
TI  - Disturbance observer based control of twin rotor aerodynamic system
AB  - Twin rotor aerodynamic system (TRAS) approximates the dynamics of helicopters and other vertical take
off rotor crafts. The nonlinear nature with significant cross-coupling between the inputs and outputs of the main and
tail rotors make the control of such system for either stabilization or reference tracking a challenging task. In this paper,
the problem of disturbance rejection for TRAS is addressed by designing disturbance observers through H∞ based
approach. The system is decoupled into main and tail rotors subsystems. For each subsystem, an inner loop disturbance
observer is synthesized that provides disturbance rejection, whereas to ensure stability and performance an outer loop
baseline feedback controller is designed. Two different cases are considered. In first case 2 proportional-integral-derivative
controllers are designed to use as outer loop baseline feedback controllers with disturbance observers whereas in the second
case linear quadratic Gaussian (LQG) controllers are designed. For both cases simulations are performed with nonlinear
Matlab Simulink model of TRAS and results are compared to determine which approach delivers better performance.
Simulation results show that the 2 conflicting requirements of reference tracking and disturbance rejection can be met
simultaneously with the proposed approach increasing the disturbance rejection capability of the closed loop system.
AU  - Shaikh, Inam Ul Hasan
AU  - Ali, Hamid
AU  - Ali, Ahsan
DO  - 10.3906/elk-1912-34
PY  - 2020
JO  - Turkish Journal of Electrical Engineering and Computer Sciences
VL  - 28
IS  - 4
SN  - 1300-0632
SP  - 2213
EP  - 2227
DB  - TRDizin
UR  - http://search/yayin/detay/513662
ER  -