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TECHNICAL PAPERS

Selection of Variables for Structural Redesign by Large Admissible Perturbations

[+] Author and Article Information
Bonhyung Koo

Department of Naval Architecture and Marine Engineering,  University of Michigan, 2600 Draper Road, Ann Arbor, MI 48109-2145bonhyung@umich.edu

Michael M. Bernitsas

Department of Naval Architecture and Marine Engineering,  University of Michigan, 2600 Draper Road, Ann Arbor, MI 48109-2145michaelb@engin.umich.edu

J. Offshore Mech. Arct. Eng 127(2), 112-121 (Jun 19, 2003) (10 pages) doi:10.1115/1.1894413 History: Received June 19, 2003

Redesign or inverse design is the process of generating a new optimal design which satisfies performance specifications starting from a baseline design with undesirable performance. The LargE Admissible Perturbation (LEAP) methodology makes it possible to redesign a structure for large changes in performance objectives and redesign variables without trial and error or repetitive finite element analyses. The next level of challenge in redesign automation is to identify a priori the structural elements and their properties that have the biggest impact and use only those in redesign. Based on LEAP, guidelines are developed in this paper for identifying effective selection of redesign variables for improved accuracy and reduced CPU time. These guidelines enable the designer to define the elements to be redesigned, to partition those elements among redesign groups, and to specify redesign variables in each group. In the numerical applications, an offshore tower is used to verify the developed guidelines. Three models of this tower with 160, 320, and 480 elements are used.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 7

Study of effect of energy distribution within redesign groups for static displacement redesign of the 320 element offshore tower; displacement requirement from 0.8to0.37m

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Figure 8

Study of effect of energy distribution within redesign groups for static displacement redesign of the 480 element offshore tower; displacement requirement from 0.8to0.37m

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Figure 2

Offshore tower: 35m×0.6m×0.6m

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Figure 3

Study of number of redesign groups on speed and accuracy in modal dynamic redesign

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Figure 4

Study of number of redesign groups on speed and accuracy in static displacement redesign

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Figure 5

Study of effect of energy distribution within redesign groups for modal dynamic redesign of the 160 element offshore tower; frequency requirement 0.52–0.72Hz

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Figure 6

Study of effect of energy distribution within redesign groups for static displacement redesign of the 160 element offshore tower; displacement requirement from 0.80to0.37m

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Figure 1

Schematic representation of incremental algorithm

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