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There are a total of 22 record(s) matching your query.
Sorted by: Date Added To NTRS in Descending order
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Weight minimization of structural components for launch in space shuttle
Author(s): Patnaik, Surya N.; Gendy, Atef S.; Hopkins, Dale A.; Berke, Laszlo
Abstract: Minimizing the weight of structural components of the space station launched into orbit in a space shuttle can save cost, reduce the number of space shuttle missions, and facilitate on-orbit fabrication. Traditional manual ...
NASA Center: Glenn Research Center
Publication Year: 1994
Added to NTRS: 2008-08-04
Accession Number: 95N22805; Document ID: 19950016388; Report Number: E-8713, NAS 1.15:4586, NASA-TM-4586
Modal test/analysis correlation of Space Station structures using nonlinear sensitivity
Author(s): Gupta, Viney K.; Newell, James F.; Berke, Laszlo; Armand, Sasan
Abstract: The modal correlation problem is formulated as a constrained optimization problem for validation of finite element models (FEM's). For large-scale structural applications, a pragmatic procedure for substructuring, model ...
NASA Center: Glenn Research Center
Publication Year: 1992
Added to NTRS: 2006-09-29
Accession Number: 92N34221; Document ID: 19920024977; Report Number: E-7297, NAS 1.15:105850, NASA-TM-105850
A Cascade Optimization Strategy for Solution of Difficult Multidisciplinary Design Problems
Author(s): Patnaik, Surya N.; Coroneos, Rula M.; Hopkins, Dale A.; Berke, Laszlo
Abstract: A research project to comparatively evaluate 10 nonlinear optimization algorithms was recently completed. A conclusion was that no single optimizer could successfully solve all 40 problems in the test bed, even though most ...
NASA Center: Glenn Research Center
Publication Year: 1996
Added to NTRS: 2005-10-13
Accession Number: 96N23242; Document ID: 19960017711; Report Number: AIAA-96-1628, E-10161, NAS 1.15:107189, NASA-TM-107189
Improved accuracy for finite element structural analysis via a new integrated force method
Author(s): Patnaik, Surya N.; Hopkins, Dale A.; Aiello, Robert A.; Berke, Laszlo
Abstract: A comparative study was carried out to determine the accuracy of finite element analyses based on the stiffness method, a mixed method, and the new integrated force and dual integrated force methods. The numerical results ...
NASA Center: Glenn Research Center
Publication Year: 1992
Added to NTRS: 2005-08-25
Accession Number: 92N22227; Document ID: 19920012984; Report Number: E-5638, NAS 1.60:3204, NASA-TP-3204
An optimization program based on the method of feasible directions: Theory and users guide
Author(s): Belegundu, Ashok D.; Berke, Laszlo; Patnaik, Surya N.
Abstract: The theory and user instructions for an optimization code based on the method of feasible directions are presented. The code was written for wide distribution and ease of attachment to other simulation software. Although the ...
NASA Center: Glenn Research Center
Publication Year: 1994
Added to NTRS: 2005-08-25
Accession Number: 94N27865; Document ID: 19940023362; Report Number: E-8124, NAS 1.15:4552, NASA-TM-4552
Merits and limitations of optimality criteria method for structural optimization
Author(s): Patnaik, Surya N.; Guptill, James D.; Berke, Laszlo
Abstract: The merits and limitations of the optimality criteria (OC) method for the minimum weight design of structures subjected to multiple load conditions under stress, displacement, and frequency constraints were investigated by ...
NASA Center: Glenn Research Center
Publication Year: 1993
Added to NTRS: 2005-08-25
Accession Number: 94N24845; Document ID: 19940020372; Report Number: E-7325, NAS 1.60:3373, NASA-TP-3373
Integrated force method versus displacement method for finite element analysis
Author(s): Patnaik, Surya N.; Berke, Laszlo; Gallagher, Richard H.
Abstract: A novel formulation termed the integrated force method (IFM) has been developed in recent years for analyzing structures. In this method all the internal forces are taken as independent variables, and the system equilibrium ...
NASA Center: Glenn Research Center
Publication Year: 1990
Added to NTRS: 2005-08-25
Accession Number: 90N18081; Document ID: 19900008765; Report Number: E-4604, NAS 1.60:2937, NASA-TP-2937
Structural optimization of large structural systems by optimality criteria methods
Author(s): Berke, Laszlo
Abstract: The fundamental concepts of the optimality criteria method of structural optimization are presented. The effect of the separability properties of the objective and constraint functions on the optimality criteria expressions ...
NASA Center: Glenn Research Center
Publication Year: 1992
Added to NTRS: 2005-08-25
Accession Number: 92N25446; Document ID: 19920016203; Report Number: E-5506, NAS 1.15:105423, NASA-TM-105423
Parallel Computational Environment for Substructure Optimization
Author(s): Gendy, Atef S.; Patnaik, Surya N.; Hopkins, Dale A.; Berke, Laszlo
Abstract: Design optimization of large structural systems can be attempted through a substructure strategy when convergence difficulties are encountered. When this strategy is used, the large structure is divided into several smaller ...
NASA Center: Glenn Research Center
Publication Year: 1995
Added to NTRS: 2005-08-25
Accession Number: 96N29626; Document ID: 19960029063; Report Number: E-9504, NAS 1.15:4680, NASA-TM-4680
Functional approximation using artificial neural networks in structural mechanics
Author(s): Alam, Javed; Berke, Laszlo
Abstract: The artificial neural networks (ANN) methodology is an outgrowth of research in artificial intelligence. In this study, the feed-forward network model that was proposed by Rumelhart, Hinton, and Williams was applied to the ...
NASA Center: Glenn Research Center
Publication Year: 1993
Added to NTRS: 2005-08-25
Accession Number: 94N11254; Document ID: 19940006782; Report Number: E-7251, NAS 1.15:105820, NASA-TM-105820
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