The nutation (wobble) of a spinning spacecraft in the presence of energy dissipation is a well-known problem in dynamics and is of particular concern for space missions. Even with modern computing systems, CFD type simulations are not fast enough to allow for large scale Monte Carlo analyses of spacecraft and launch vehicle dynamic behavior with slosh included. Simplified mechanical analogs for the slosh are preferred during the initial stages of design to reduce computational time and effort to evaluate the Nutation Time Constant (NTC). Analytic determination of the slosh analog parameters has met with mixed success and is made even more difficult by the introduction of propellant management devices such as elastomeric diaphragms. By subjecting full-sized fuel tanks with actual flight fuel loads to motion similar to that experienced in flight and measuring the forces experienced by the tanks, these parameters can be determined experimentally. Currently, the identification of the model parameters is a laborious trial-and-error process in which the hand-derived equations of motion for the mechanical analog are evaluated and their results compared with the experimental results. Of particular interest is the effect of diaphragms and bladders on the slosh dynamics and how best to model these devices. An experimental set-up is designed and built to include a diaphragm in the simulated spacecraft fuel tank subjected to lateral slosh. This research paper focuses on the parameter estimation of a SimMechanics model of the simulated spacecraft propellant tank with and without diaphragms using lateral fuel slosh experiments. Automating the parameter identification process will save time and thus allow earlier identification of potential vehicle problems.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Mechanical Analog Approach to Parameter Estimation of Lateral Spacecraft Fuel Slosh


    Beteiligte:
    Chatman, Yadira (Autor:in) / Gangadharan, Sathya (Autor:in) / Schlee, Keith (Autor:in) / Sudermann, James (Autor:in) / Walker, Charles (Autor:in) / Ristow, James (Autor:in) / Hubert, Carl (Autor:in)

    Kongress:

    48th AIAA Structures, Structural Dynamics, and Materials (SDM) Conference ; 2007 ; Honolulu, HI, United States


    Erscheinungsdatum :

    2007-04-23


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Mechanical Analog Approach to Parameter Estimation of Lateral Spacecraft Fuel Slosh

    Chatman, Yadira / Gangadharan, Sathya / Schlee, Keith et al. | AIAA | 2007


    Mechanical Analog Approach to Parameter Estimation of Lateral Spacecraft Fuel Slosh

    Chatman, Yadira / Gangadharan, Sathya / Marsell, Brandon et al. | AIAA | 2008


    Parameter Estimation of Lateral Spacecraft Fuel Slosh

    Sudermann, James E. / Schlee, Keith L. | NTRS | 2008


    Parameter Estimation of Spacecraft Fuel Slosh

    Schlee, Keith / Gangadharan, Sathya / Ristow, James et al. | AIAA | 2006


    Modeling, Simulation, and Parameter Estimation of Lateral Spacecraft Fuel Slosh

    Chatman, Yadira / Gangadharan, Sathya / Marsell, Brandon et al. | NTRS | 2008