A major problem with operations of lifting reentry vehicle having and aft center-of-gravity location due to large engine mass at the rear is the required hypersonic trim to fight the desired trajectory. This condition is most severe for lifting maneuvers. As a first step toward analyzing this problem, this paper considers the lift requirement for some basic maneuvers in the plane of a great circle. Considerations are given to optimal lift control for achieving the maximization of either the final altitude, speed or range. For the maximum-range problem, phugoid oscillation along an optimal trajectory is less severe as compared to a glide with maximum lift-to-drag ratio. An explicit formula for the number of oscillations for an entry from orbital speed is proposed.


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    Title :

    Phugoid oscillations in optimal reentry trajectories


    Contributors:
    Vinh, N. X. (author) / Lin, C. F. (author) / Chern, J. S. (author)

    Published in:

    Publication date :

    1981-04-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English





    Phugoid oscillations at hypersonic speeds

    CHOU, Y. S. / LAITONE, E. V. | AIAA | 1965


    Phugoid oscillations at hypersonic speeds

    Laitone, E.V. / Chou, Y.S. | Engineering Index Backfile | 1965