Linear analyses are performed to examine the generic aspects of aerospace vehicle longitudinal long-period or trajectory modes of motion. The influence of Mach number, dynamic pressure, thrust-to-drag ratio, and propulsion system thrust laws on the longitudinal trajectory modes is presented in terms of phugoid frequency and damping and height mode stability. The results of these analyses are compared to flying qualities requirements where possible, and potential deficiencies in both the vehicle and the criteria are noted. A preliminary look at possible augmentation schemes to improve potential deficiencies is also presented. Interpretation of the practical consequences of the results is aided by typical time histories. Results indicate that propulsion system characteristics are the dominant influence on the longitudinal long-period flight dynamics of hypersonic aerospace craft. However, straightforward augmentation systems demonstrated the potential to accommodate these influences if the effects are included in the design process. These efforts may be hampered by a lack of design criteria for hypersonic aircraft.


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    Title :

    Longitudinal long-period dynamics of aerospace craft


    Contributors:

    Conference:

    AIAA Atmospheric Flight Mechanics Conference ; 1988 ; Minneapolis, MN, United States


    Publication date :

    1988-01-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English







    Thrust law effects on the long-period modes of aerospace craft

    Markopoulos, Nikos / Mease, Kenneth D. / Vinh, Nguyen X. | NTRS | 1989


    Thrust law effects on the long-period modes of aerospace craft

    MARKOPOULOS, NIKOS / MEASE, KENNETH / VINH, NGUYEN | AIAA | 1989