A key challenge in designing the new High Speed Civil Transport (HSCT) aircraft is determining a good match between the airframe and engine. Multidisciplinary design optimization can be used to solve the problem by adjusting parameters of both the engine and the airframe. Earlier, an example problem was presented of an HSCT aircraft with four mixed-flow turbofan engines and a baseline mission to carry 305 passengers 5000 nautical miles at a cruise speed of Mach 2.4. The problem was solved by coupling NASA Lewis Research Center's design optimization testbed (COMETBOARDS) with NASA Langley Research Center's Flight Optimization System (FLOPS). The computing time expended in solving the problem was substantial, and the instability of the FLOPS analyzer at certain design points caused difficulties. In an attempt to alleviate both of these limitations, we explored the use of two approximation concepts in the design optimization process. The two concepts, which are based on neural network and linear regression approximation, provide the reanalysis capability and design sensitivity analysis information required for the optimization process. The HSCT aircraft optimization problem was solved by using three alternate approaches; that is, the original FLOPS analyzer and two approximate (derived) analyzers. The approximate analyzers were calibrated and used in three different ranges of the design variables; narrow (interpolated), standard, and wide (extrapolated).


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Design Process for High Speed Civil Transport Aircraft Improved by Neural Network and Regression Methods


    Beteiligte:


    Erscheinungsdatum :

    01.04.1998


    Medientyp :

    Sonstige


    Format :

    Keine Angabe


    Sprache :

    Englisch





    Neural Network and Regression Approximations in High-Speed Civil Aircraft Design Optimization

    Surya N. Patnaik / James D. Guptill / Dale A. Hopkins et al. | AIAA | 1998



    High-speed Civil Transport Aircraft Emissions

    Miake-Lye, Richard C. / Matulaitis, J. A. / Krause, F. H. et al. | NTRS | 1992


    High-Speed Civil Transport Aircraft Emissions

    R. C. Miake-lye / J. A. Matulaitis / F. H. Krause et al. | NTIS | 1992