Traditional commercial aircraft design attempts to achieve improved performance and reduced operating costs by minimizing gross takeoff weight (GTOW). From the point of view of an aircraft manufacturer, however, this method does not guarantee the financial viability of an aircraft program. A better design approach takes into account not only aircraft performance but also factors such as aircraft demand, market uncertainty, and development and manufacturing cost. This paper describes a design method resulting in an multidisciplinary optimization framework to consider both performance and finance in aircraft program design. The optimization procedure couples an aircraft performance model with a stochastic program valuation technique. The resulting program value is used as the new objective for the design optimization problem. The methodology and framework developed are applied to a design example for the Blended-Wing-Body aircraft concept. A traditional deterministic net present value metric is shown to be inappropriate for use as a design optimization objective function because the result is very sensitive to the choice of discount rate. Using the stochastic framework, value-based optimization yields a design with a 2.3% higher program value than that obtained via conventional minimum-GTOW optimization. Comparing the performance-optimized and value-optimized designs, it is shown that the optimizer chooses to trade aerodynamic efficiency for reduced manufacturing costs. The effect of varying the aircraft range on maximum-value designs demonstrates that incorporating value into the design process permits more fully-informed program decisions that have optimal financial impact.


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    Titel :

    Value-based multidisciplinary optimization for commercial aircraft design


    Beteiligte:
    Peoples, Ryan (Autor:in) / Willcox, Karen (Autor:in)


    Erscheinungsdatum :

    2004


    Format / Umfang :

    11 Seiten, 22 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch