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A Robust Controller Approach for Configuration Selection for an Urban Transportation Electric Vertical Takeoff and Landing Aircraft (EVTOL)

Fattahi Massoum, Reza | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52933 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Malaek, Mohammad Bagher
  7. Abstract:
  8. This thesis addresses the problem of configuration selection for an urban air mobility EVTOL aircraft utilizing a robust controller approach.First of all, to arrive at a final configuration, different feasible concepts for an urban transportation EVTOL aircraft have been proposed and studied during several brainstorming sessions. As a result, five potentially viable configurations have been selected for further investigation and analysis. These preliminary designs have been nominated utilizing the method of decision matrices and considering the design team and control system designer’s selection criteria. Finally, a tilt-rotor tandem-wing configuration has been selected to go through the initial configuration development process.Secondly, the final configuration has been mathematically modeled, and the equations of motion have been derived. Next, various nonlinear control techniques have been studied, and a sliding mode control approach has been adopted to design the control system. Moreover, based on the control-configured-vehicle concept and during the early stages of configuration development, numerous modifications have been made so that the design could effectively satisfy the flight handling and ride quality requirements. For the final configuration, a stability and control analysis and a trimmability assessment have been carried out to approve the ongoing design process further.Ultimately, flight simulation has been carried out for different flight scenarios, involving hover, cruise, OEI, and coordinated turn maneuver. These simulations have been done in the presence of external disturbances and parametric uncertainties in takeoff weight, inertia matrix, and the location of the aircraft center of gravity. Final results indicate the successful implementation of the sliding mode control-based controller and adequate robustness for the system at hand. Thus, the EVTOL has been proved stable and controllable in different flight phases
  9. Keywords:
  10. Robust Control ; Sliding Mode Control ; UrbanTransport ; Handling Quality ; Electric Vertical Takeoff and Landing Aircraft (EVTOL) ; Electric Aircraft ; Configuration Selection Strategy

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