Orion Crew Module (CM) touchdown detection is critical to activating the post-landing sequence that safe s the Reaction Control Jets (RCS), ensures that the vehicle remains upright, and establishes communication with recovery forces. In order to accommodate safe landing of an unmanned vehicle or incapacitated crew, an onboard automated detection system is required. An Orion-specific touchdown detection algorithm was developed and evaluated to differentiate landing impact from in-flight events. The proposed method would be used to initiate cutting of the parachute riser lines, decrease the probability of CM rollover, and to terminate RCS jet firing prior to submersion. The RCS jets continue to fire until touchdown to maintain proper CM orientation with respect to the flight path and to limit impact loads, but have potentially hazardous consequences if submerged while firing. The time available after impact to cut risers and initiate the CM Up-righting System (CMUS) is measured in minutes, whereas the time from touchdown to RCS jet submersion is a function of descent velocity, sea state conditions, and is likely on the order of a second or less. Evaluation of the detection algorithms was performed for in-flight events (descent under main chutes) using hi-fidelity rigid body analyses in the Decelerator Systems Simulation (DSS), whereas water impacts were simulated using a rigid finite element model of the Orion CM in LS-DYNA. In addition to simulation, parachute drop test data and vehicle mockup impact drop test data were analyzed to assess detection performance.


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    Titel :

    Assessment of an Automated Touchdown Detection Algorithm for the Orion Crew Module


    Beteiligte:
    R. S. Gay (Autor:in)

    Erscheinungsdatum :

    2011


    Format / Umfang :

    3 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch






    Assessment of an Automated Touchdown Detection Algorithm for the Orion Crew Module

    Gay, R. / Baldwin, M. / American Institute of Aeronautics and Astronautics; Conferderation of European Aerospace Societies | British Library Conference Proceedings | 2011


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