The Cassini spacecraft dynamics telemetry during long main engine burns has indicated the presence of stable limit cycles between 0.03 and 0.05 Hz frequencies. Even though these limit cycles have been observed in telemetry, they have not hindered the spacecraft performance to any degree of concern. The performance of the main engine thrust vector control system has been excellent throughout the prime and extended missions. However, it is important to understand these stable limit cycles from a controller design viewpoint. It is proposed that the observed limit cycles in the dynamics telemetry appear from a stable interaction between the unmodeled nonlinear elements and the linear main engine thrust vector control system. This paper focuses on one such nonlinearity that emerges from the gear backlash in the engine gimbal actuator system. The gear backlash nonlinearity is modeled via a describing function, and the interaction between the nonlinear element model and the overall dynamics of the spacecraft is studied. With this interaction, the stable limit cycle is reproduced analytically and in simulation. The results are compared with the actual telemetry from long burns like Saturn orbit insertion and main engine orbit trim maneuvers. The predicted stable limit cycle frequency and amplitude show good agreement within 6% error between the analytical, simulation, and telemetry results. This work claims that the stable limit cycles occur due to the stable interaction between the unmodeled nonlinear elements and linear main engine thrust vector control system.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Characterizing Limit Cycles in the Cassini Thrust Vector Control System


    Contributors:

    Published in:

    Publication date :

    2013-09-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





    Characterizing Observed Limit Cycles in the Cassini Main Engine Thrust Vector Control System

    Rizvi, F. / Weitl, R. / American Institute of Aeronautics and Astronautics; Conferderation of European Aerospace Societies | British Library Conference Proceedings | 2011