Control and comparison of an electromechanically actuated control surface according to different sensor locations

In missile systems with a control actuation system, in terms of control methods, sensors and their locations have an important effect on control methods. Transmission mechanisms between the sensor measuring locations and control surfaces make control of system difficult due to their non-linear behavior. This nonlinear situation is caused by backlash and deformations between control surfaces and sensor position. In this study, differences between direct feedback and indirect feedback and differences caused by these differences in terms of controller will be examined. In order to study this situation, position sensors are placed on two different mechanism parts for an electromechanical fin actuation system, which is responsible for directing a missile. After this placement, system identification of the fin actuation system has been made with measurement from fin angle. After that, controllers have been designed. The first controller was designed by method of state feedback. In first simulation studies, it is observed that the controller made steady state errors under the disturbing effect. In order to eliminate the steady state error, an integrally effective outer loop has been added to the controller that the error resets. As an alternative to the controller designed with state feedback method, a PID controller with same roots has been designed. Then the controllers are in real time tested. In order to minimize the effects of measurement errors and nonlinearities, backlash and material deformations caused by the nature of the mechanism by using the feedback from two different sensors, it has been observed that the system response is cleared from the error values caused by the backlash and the system can be controlled more accurately. Keywords: Electromechanical, Sensor, Control