Pilotmodeller till flygmekanisk simulator för JAS 39 Gripen

Detta är en Master-uppsats från Linköpings universitet/Mekanik; Linköpings universitet/Mekanik

Sammanfattning:

Abstract

SAAB has for a long time used user controlled pilot models in ARES. ARES is a simulation tool used in the desktop environment for simulations and calculations of the JAS 39 Gripen fighter and other aircraft. ARES stands for ”Aircraft Rigid body Engineering Simulation”. To work with these pilot models has been both time-consuming and inefficient. In this master thesis, new pilot models are developed, where parameters are automatically generated, this will result in that the user doesn’t have to put a lot of work into adjusting the gains for different manoeuvres. This is called gain scheduling.

To make this possible, simple models of the aircraft were created at different points in the envelope. These models were then used to calculate optimal controllers using LQ-control and pole placement techniques. These models and controllers were then implemented in Simulink. Simulink was then used to test the controllers before they were implemented in ARES.

Control in all modes except roll attitude and speed by throttle are based on LQ-control in pitch-, roll- and yaw-angular velocity. And through these angular velocities the other angles are controlled by simple controllers, who is generating a reference in angular velocity. The roll attitude controller is based on direct pole placement based upon desired damping and undamped natural frequency, and the speed controller is based upon a model of throttle positions in trimmed states.

The new pilot models are usable to control:

  • Roll rate
  • Roll attitude
  • Pitch rate
  • Pitch attitude
  • Angle of attack
  • Load factor
  • Yaw attitude
  • Course angle
  • Climb angle
  • Mach number
  • Climb rate

These controllers can be combined so that the aircraft can perform desired maneuvers.

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