Large scale structural synthesis |
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Authors: | Garret N Vanderplaats Hirokazu Miura Mladen Chargin |
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Institution: | Department of Mechanical Environmental Engineering, The University of California at Santa Barbara, Santa Barb Barbara, CA 93160, U.S.A.;NASA Ames Research Center, Moffett Field, CA 94035, U.S.A. |
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Abstract: | A general purpose optimization program is coupled to a large scale finite element program to provide an efficient tool for structural synthesis. The resulting interface program may be used to design structures for minimum weight, subject to constraints on stress, displacement, and vibration frequencies. A variety of state-of-the-art techniques are employed, including design variable linking, constraint deletion, reciprocal variables, and formal approximations. The capability is demonstrated with the design of a gear housing using 30 design variables and over 5000 nonlinear inequality constraints. The finite element model consists of over 1600 elements and 7000 displacement degrees of freedom. The design required six detailed finite element analyses and approximately one hour on a Cray-1s supercomputer. It is concluded that structures of practical size and complexity can be efficiently designed using numerical optimization. |
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