Browsing by Author "Cramer, E.J."

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    Comparing Problem Formulation for Coupled Sets of Component
    (2007-11) Arroyo, S.F.; Cramer, E.J.; Frank, P.D.; Dennis, J.E. Jr.
    In this paper several formulations and comparative test results are presented for problems involving the general paradigm of coupled sets of components. This paradigm is general enough to include systems of systems (SoS) and multidisciplinary design optimization (MDO). It is assumed that these systems involve a (potentially inactive) coordinating component, or "Central Authority" and one or more, potentially interacting, subordinate components. The formulations differ in the amount of control given to the central authority versus the autonomy granted to the subordinate components. Comparative test results are given for several of the formulations on a NASA-generated, public domain, aircraft conceptual design problem.
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    On Alternative Problem Formulations for Multidisciplinary Design Optimization
    (1992-12) Cramer, E.J.; Frank, P.D.; Shubin, G.R.; Dennis, J.E.; Lewis, R.M.
    In this paper we introduce a perspective on multidisciplinary design optimization (MDO) problem formulation that provides a basis for choosing among existing formulations and suggests provocative, new ones. MDO problems offer a richer spectrum of possibilities for problem formulation than do single discipline design optimization problems, or multidisciplinary analysis problems. This is because the variables and the equations that characterize the MDO problem can be "partitioned" in some interesting ways between what we traditionally think of as the "analysis code(s)" and the "optimization code." An MDO approach can be characterized by what part of the overall computation is done in each code, how that computation is done, and what information is communicated between the codes.