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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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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