The report documents the derivation and evaluation of an automatic flight trajectory synthesis algorithm which has the capability to generate both time-free DOC-optimal and time-fixed fuel-optimal cruise trajectories for FMS applications. The algorithm is based on a regularly perturbed optimal control formulation of cruise at constant altitude. A nominal reduced-order model, featuring a U.S. Standard atmosphere and no winds-aloft, is used as a baseline in the present study. Complicating effects such as winds-aloft, off-nominal ambient temperatures, engine losses due to power extraction and bleedair, etc. are then embedded in the dynamic model using a regular perturbation approach. The capability of the algorithm to accurately predict (and possibly control) the arrival time is a direct consequence of the fact that the proposed procedure is capable of producing fairly accurate predictions of both initial and final state and control. In contrast to most recent studies dealing with automatic flight trajectory synthesis, a variable-weight dynamic model is used in the present work.


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    Title :

    Approach to On-Board Optimization of Cruise at Constant Altitude


    Contributors:

    Publication date :

    1989


    Size :

    53 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





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