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Efficient Analysis of Complex StructuresLast various accomplishments achieved during this project are : (1) A Survey of Neural Network (NN) applications using MATLAB NN Toolbox on structural engineering especially on equivalent continuum models (Appendix A). (2) Application of NN and GAs to simulate and synthesize substructures: 1-D and 2-D beam problems (Appendix B). (3) Development of an equivalent plate-model analysis method (EPA) for static and vibration analysis of general trapezoidal built-up wing structures composed of skins, spars and ribs. Calculation of all sorts of test cases and comparison with measurements or FEA results. (Appendix C). (4) Basic work on using second order sensitivities on simulating wing modal response, discussion of sensitivity evaluation approaches, and some results (Appendix D). (5) Establishing a general methodology of simulating the modal responses by direct application of NN and by sensitivity techniques, in a design space composed of a number of design points. Comparison is made through examples using these two methods (Appendix E). (6) Establishing a general methodology of efficient analysis of complex wing structures by indirect application of NN: the NN-aided Equivalent Plate Analysis. Training of the Neural Networks for this purpose in several cases of design spaces, which can be applicable for actual design of complex wings (Appendix F).
Document ID
20000021275
Acquisition Source
Langley Research Center
Document Type
Other
Authors
Kapania, Rakesh K.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 2000
Subject Category
Structural Mechanics
Funding Number(s)
CONTRACT_GRANT: NAG1-1884
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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