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2 nd SSS , July 2010, Christina Scholz

Performance Analysis of an Attitude Control System for Solar Sails Using Sliding Masses Christina Scholz Daniele Romagnoli Bernd Dachwald. 2 nd SSS , July 2010, Christina Scholz. Overview. Motivation on the project Introduction on the simulation Description of the controllers

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2 nd SSS , July 2010, Christina Scholz

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  1. Performance Analysis of an Attitude Control System for Solar Sails Using Sliding Masses Christina ScholzDaniele RomagnoliBernd Dachwald 2nd SSS , July 2010, Christina Scholz

  2. Overview Motivation on the project Introduction on the simulation Description of the controllers Presentation on simulation results Conclusion and future research objectives 2nd SSS, July 2010, Christina Scholz

  3. Motivation on the Project Preliminary study for an attitude control system of solar sails (Gossamer Project DLR) Analyze the capabilities of the attitude control system for the most chalanging cases Testing the behaviour of the attitude control system by changing the design parameters 2nd SSS, July 2010, Christina Scholz

  4. Simualtion Approach Objective • Closed loop with controller • Dynamics simulation reduced Assumptions • Perfect reflecting sail • Rigid body 2nd SSS, July 2010, Christina Scholz

  5. Equation of Motion With [Solar-Sail Attitude Control Design for a Sail Flight Validation Mission, by Wie, Murphy] 2nd SSS, July 2010, Christina Scholz

  6. Simulation Capabilities One, two and three body axis maneuvers Offset torques due to the displaced center of pressure with respect to the center of the geometry A non-diagonal inertia matrix External torques 2nd SSS, July 2010, Christina Scholz

  7. Control ApproachThe Controller Structure • The Controller has two degrees-of-freedom 2nd SSS, July 2010, Christina Scholz

  8. [Solar-Sail Attitude Control Design for a Sail Flight Validation Mission, by Wie, Murphy] Equation of Motion Used for the Feed Forward Controler Design 2nd SSS, July 2010, Christina Scholz

  9. Tasks of the Controller Feed Forward Controller • Design and computation of the desired trajectory • Handling of the torques due to the offsetvector Feed Back Controller • Compensating torques due to disturbances • Compensating simplifications in the model • Compensating non-diagonal elements in the inertia matrix • Compensating the change of the inertia principal elements 2nd SSS, July 2010, Christina Scholz

  10. Simulation Results Parameters of Test Case • 40x40m square sail • 1200m² sail surface • 2 sliding masses of 1kg each • 150kg satellite bus mass • inertia matrix • 1AU from Sun  4.563x10-6 N/m² [Solar-Sail Attitude Control Design for a Sail Flight Validation Mission, by Wie, Murphy] 2nd SSS, July 2010, Christina Scholz

  11. Presentation of a Default Maneuver • Two axis maneuver • 40° pitch • 10° yaw • Environmental torques • 0 Nm about the roll axis • 0 Nm about the pitch axis • 0.00001 Nm about the yaw axis • Offset vector • 0 m in x-direction • 0.1 m in y-direction • 0.04 m in z-direction 2nd SSS, July 2010, Christina Scholz

  12. Discussion of the Results 2nd SSS, July 2010, Christina Scholz

  13. Discussion of the Results 2nd SSS, July 2010, Christina Scholz

  14. Discussion of the Results 2nd SSS, July 2010, Christina Scholz

  15. ROLL PITCH YAW Discussion of the Results 2nd SSS, July 2010, Christina Scholz

  16. Influence of the Offset Vector on the Near-Optimal Maneuvertime for a Single 35° Yaw Maneuver 2nd SSS, July 2010, Christina Scholz

  17. Comparison of a Single 35° Reorientation With Different Disturbances Acting on the System 2nd SSS, July 2010, Christina Scholz

  18. Comparison of the Position of the Sliding Masses for Different Single Maneuvers 2nd SSS, July 2010, Christina Scholz

  19. Conclusion • An attitude controller for solar sails using sliding masses as control elements developed • Simulation for simplified dynamics and different disturbances • Controller allowes to perform two axes maneuvers simultaneously  reducing maneuver time Open Points • Establishing a maneuver-time optimization • Consider flexible structures • Develop coupled simulation of orbit and attitude  orbit control simulation • Exploration of possible couplings between thermal distributions and attitude dynamics 2nd SSS, July 2010, Christina Scholz

  20. Please Contact Us for Further Information Christina Scholz: christina.scholz@dialup.fh-aachen.de Daniele Romagnoli: Daniele.Romagnoli@dlr.de Bernd Dachwald: dachwald@fh-aachen.de 2nd SSS, July 2010, Christina Scholz

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