This paper presents an adaptive guidance system approach applied to hypersonic Reusable Launch Vehicles (RLVs). After an effector failure, it is assumed that the inner-closed-loop system utilizes a reconfigurable control algorithm to recover nominal maneuvering capabilities to the extent possible. However, nominal performance will typically not be fully recovered for RLVs, and the outer-loop guidance system must account for the degraded vehicle response. Two main approaches for the adaptive guidance system are presented. The first approach augments the existing production guidance system by adding adaptation capabilities. A case study shows that stability is maintained following a primary pitch effector failure. This is achieved by adapting gains in the guidance feedback loops. However, it is shown that the trajectory commands to the guidance loops must also be re-targeted in order to achieve a safe landing. The second approach employs an on-line optimal trajectory re- targeting algorithm. Here, the calculus of variations is used to generate a database of admissible neighboring extremals. This database is then encoded in an efficient manner to generate mappings between the current states and vehicle capabilities and the costates defining the admissible optimal trajectories. These mappings are interrogated on-line at regular intervals to obtain the optimal guidance commands. A proof-of-concept case study of this approach shows that the final landing conditions are achieved following a primary speed control effector failure.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Adaptive Guidance Systems for Hypersonic Reusable Launch Vehicles


    Contributors:
    J. D. Schierman (author) / D. G. Ward (author) / J. R. Hull (author) / J. F. Monaco (author) / M. J. Ruth (author)

    Publication date :

    2001


    Size :

    13 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    Adaptive guidance systems for hypersonic reusable launch vehicles

    Schierman, J.D. / Ward, D.G. / Hull, J.R. et al. | IEEE | 2001


    Hypersonic Aerothermoelastic Studies for Reusable Launch Vehicles

    McNamara, Jack / Thuruthimattam, Biju / Friedmann, Peretz et al. | AIAA | 2004


    Adaptive Guidance with Trajectory Reshaping for Reusable Launch Vehicles

    Schierman, John / Hull, Jason / Ward, David | AIAA | 2002



    Terminal area guidance for reusable launch vehicles

    Zhou, Min / Zhou, Jun / Guo, Jianguo | SAGE Publications | 2016