Minimum Weight Design of Stiffened Cylindrical Shells Using Structural Synthesis
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| Title: | Minimum Weight Design of Stiffened Cylindrical Shells Using Structural Synthesis |
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| Authors: | Heckelbeck, Joseph Eugene |
| Committee Members: | Block, David T.; David T. Block (Q57744499)University of Central Florida. College of Engineering [VIAF]University of Central Florida. College of Engineering [LC] |
| Summary: | Several search methods for unconstrained minimization in the minimum weight design of a stiffened cylindrical shell are investigated. The cylindrical shell, under study, is stiffened with bar shaped stiffeners in the longitudinal and circumferential directions, and capable of being loaded both axially and radially with up to ten separate load conditions. For this investigation, it was necessary to alter an unconstrained minimization program for use on the IBM 360 computer by employing double precision techniques. The computer runs obtained on this system are compared with those provided by the prior work of William Morrow and Lucien Schmit. The results show, as great as, a 7% reduction in the final weight. Either slight alterations in the initial stiffener and cylinder dimensions, or the conversion of the program to double precision is responsible for the change. Regardless of which, the sensitivity or inexactness of the minimization process is apparent. |
| URL: | https://stars.library.ucf.edu/rtd/14 |
| Database: | OpenDissertations |
| Abstract: | Several search methods for unconstrained minimization in the minimum weight design of a stiffened cylindrical shell are investigated. The cylindrical shell, under study, is stiffened with bar shaped stiffeners in the longitudinal and circumferential directions, and capable of being loaded both axially and radially with up to ten separate load conditions. For this investigation, it was necessary to alter an unconstrained minimization program for use on the IBM 360 computer by employing double precision techniques. The computer runs obtained on this system are compared with those provided by the prior work of William Morrow and Lucien Schmit. The results show, as great as, a 7% reduction in the final weight. Either slight alterations in the initial stiffener and cylinder dimensions, or the conversion of the program to double precision is responsible for the change. Regardless of which, the sensitivity or inexactness of the minimization process is apparent. |
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