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Bi-Level Integrated System Synthesis (BLISS)BLISS is a method for optimization of engineering systems by decomposition. It separates the system level optimization, having a relatively small number of design variables, from the potentially numerous subsystem optimizations that may each have a large number of local design variables. The subsystem optimizations are autonomous and may be conducted concurrently. Subsystem and system optimizations alternate, linked by sensitivity data, producing a design improvement in each iteration. Starting from a best guess initial design, the method improves that design in iterative cycles, each cycle comprised of two steps. In step one, the system level variables are frozen and the improvement is achieved by separate, concurrent, and autonomous optimizations in the local variable subdomains. In step two, further improvement is sought in the space of the system level variables. Optimum sensitivity data link the second step to the first. The method prototype was implemented using MATLAB and iSIGHT programming software and tested on a simplified, conceptual level supersonic business jet design, and a detailed design of an electronic device. Satisfactory convergence and favorable agreement with the benchmark results were observed. Modularity of the method is intended to fit the human organization and map well on the computing technology of concurrent processing.
Document ID
Document Type
Technical Memorandum (TM)
Sobieszczanski-Sobieski, Jaroslaw
(NASA Langley Research Center Hampton, VA United States)
Agte, Jeremy S.
(George Washington Univ. Hampton, VA United States)
Sandusky, Robert R., Jr.
(George Washington Univ. Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1998
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
NAS 1.15:208715
Funding Number(s)
PROJECT: RTOP 509-10-31-03
Distribution Limits
Work of the US Gov. Public Use Permitted.

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