Loading...

Predictive and Nonlinear Control of Aircraft in Presence of Microburst Wind Shear

Jafari, Navid | 2014

457 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46367 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Pourtakdoust, Hosein
  7. Abstract:
  8. Airplanes usually experience minor position change and height loss during cruise flight, but under normal circumstances the aircraft total energy is adequately acceptable to maintain the trajectory and the desired performance without severe oscillations. On the other hand, if the airplane encounters a wind-shear or microburst during take-off or landing phases, it would be a dangerous situation, as the aircraft kinetic and potential energy levels are not as high.
    In this research, a model predictive controller is designed and investigated to allow a transport category aircraft to either escape or penetrate the microburst. In this regard, initially a DMC controller is designed for 6-DoF model of the airplane without considering the microburst for the two mentioned scenarios of escape and penetration . Subsequently, In order to investigate the effect of microburst, it is introduced as a disturbance to the system and the performance of the controller as well as the airplane response is investigated. Moreover, as microburst in not only as a disturbance, but can also be considered as a part of system's dynamic, its effects are included in the 6-DoF equations of motion. In this respect the dynamic equations of airplane including the microburst as a part of its dynamic, have been linearized and a DMC controller is redesigned. As the actual system will be time variant in this case, the linearization is performed at two working flight conditions for a better accuracy.
    The results of this research indicate that the DMC controller is capable of passing the aircraft through the microburst with acceptable safety. In this sense, the airplane has tracked the desired trajectory with a maximum height change of 33%, velocity change of 27% with acceptable range of angle of attack. It is important to note that the transitional escape maneuver is similar to the first result, obtained with burst as a disturbance, with a 40 seconds time delay in comparison to the first DMC design
  9. Keywords:
  10. Predictive Control ; Microburst ; Nonlinear Control ; Dynamic Matrix Control (DMC)

 Digital Object List

 Bookmark

No TOC