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A cascade optimization strategy for solution of difficult multidisciplinary design problems
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Patnaik, Surya N. Coroneos, Rula M. Hopkins, Dale A. Berke, Laszlo |
| Copyright Year | 1996 |
| Description | 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 optimizers successfully solved at least one-third of the problems. We realized that improved search directions and step lengths, available in the 10 optimizers compared, were not likely to alleviate the convergence difficulties. For the solution of those difficult problems we have devised an alternative approach called cascade optimization strategy. The cascade strategy uses several optimizers, one followed by another in a specified sequence, to solve a problem. A pseudorandom scheme perturbs design variables between the optimizers. The cascade strategy has been tested successfully in the design of supersonic and subsonic aircraft configurations and air-breathing engines for high-speed civil transport applications. These problems could not be successfully solved by an individual optimizer. The cascade optimization strategy, however, generated feasible optimum solutions for both aircraft and engine problems. This paper presents the cascade strategy and solutions to a number of these problems. |
| File Size | 653108 |
| Page Count | 9 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19960017711 |
| Archival Resource Key | ark:/13960/t8sb9145m |
| Language | English |
| Publisher Date | 1996-03-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Engine Design Multiphase Flow Transport Aircraft Aircraft Design Aircraft Engines Algorithms Supersonic Aircraft Cascades Turbofan Engines Air Breathing Engines Nonlinear Programming Aircraft Configurations Multidisciplinary Design Optimization Subsonic Aircraft Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
