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TECHNICAL PAPERS

Integrated Redesign of Large-Scale Structures by Large Admissible Perturbations

[+] Author and Article Information
Vincent Y. Blouin

Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921e-mail: vblouin@clemson.edu

Michael M. Bernitsas

Department of Naval Architecture and Marine Engineering, The University of Michigan Ann Arbor, MI 48109-2145e-mail: michaelb@umich.edu

Denby Morrison

Offshore Systems Technology, Shell International EP, Houston, TX 77001e-mail: br37dgm@shellus.com

J. Offshore Mech. Arct. Eng 125(4), 234-241 (Oct 01, 2003) (8 pages) doi:10.1115/1.1596236 History: Received May 01, 2001; Revised September 01, 2002; Online October 01, 2003
Copyright © 2003 by ASME
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References

Bernitsas, M. M., ed., 1994, RESTRUCT: Theoretical Manual, Report to The University of Michigan/Sea Grant/Industry Consortium in Offshore Engineering, Department of Naval Architecture and Marine Engineering, The University of Michigan, Ann Arbor, MI.
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Bernitsas,  M. M., and Blouin,  V. Y., 1999, “Structural Redesign for Forced Response Amplitude With Proportional Damping by Large Admissible Perturbations,” AIAA J., 37(11), pp. 1506–1513.
Blouin,  V. Y., and Bernitsas,  M. M., 2001, “Redesign of Submerged Structures by Large Admissible Perturbations,” ASME J. Offshore Mech. Arct. Eng., 123(3), pp. 103–111.
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Figures

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Schematic representation of DM algorithm
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Offshore tower finite element model
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Response time histories in x, y, z; total response; exact and approximated maximum amplitudes at node 1 (upper deck)
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Response time histories due to two different sources of excitation
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Modal anti-nodes for low excitation frequency
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Computational time vs. number of constraints: 16 element sets, 32 redesign variables, 20 extracted modes; computation of perturbation terms, T1 (solid line); optimization phase in absence of conflict, T2 (dots); optimization phase with conflict (dash line)
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Frequency response curves of tower at node 1 (upper deck) in x-direction, before and after redesign

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