Coupled Multi-Disciplinary Optimization for Structural Reliability and AffordabilityA computational simulation method is presented for Non-Deterministic Multidisciplinary Optimization of engine composite materials and structures. A hypothetical engine duct made with ceramic matrix composites (CMC) is evaluated probabilistically in the presence of combined thermo-mechanical loading. The structure is tailored by quantifying the uncertainties in all relevant design variables such as fabrication, material, and loading parameters. The probabilistic sensitivities are used to select critical design variables for optimization. In this paper, two approaches for non-deterministic optimization are presented. The non-deterministic minimization of combined failure stress criterion is carried out by: (1) performing probabilistic evaluation first and then optimization and (2) performing optimization first and then probabilistic evaluation. The first approach shows that the optimization feasible region can be bounded by a set of prescribed probability limits and that the optimization follows the cumulative distribution function between those limits. The second approach shows that the optimization feasible region is bounded by 0.50 and 0.999 probabilities.
Document ID
20030020428
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Abumeri, Galib H. (QSS Group, Inc. Cleveland, OH United States)
Chamis, Christos C. (NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
August 21, 2013
Publication Date
February 1, 2003
Publication Information
Publication: Ageing Mechanisms and Control Symposium