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Optimization of support positions to maximize the fundamental frequency of structures

✍ Scribed by D. Wang; J. S. Jiang; W. H. Zhang

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
249 KB
Volume
61
Category
Article
ISSN
0029-5981

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✦ Synopsis

Abstract

In this paper, the position optimization of simple supports is implemented to maximize the fundamental frequency of a beam or plate structure. Both elastic and rigid supports are taken into account. First, the frequency sensitivity with respect to the movement of a simple support is derived using the discrete method. By means of the shape functions of the finite element method, closed‐form sensitivity formulations are developed straightforwardly. Then, a heuristic approach, called evolutionary shift method, is presented for optimizing support positions with a fixed grid mesh scheme. Based on the design sensitivity analysis, the support with the highest efficiency is shifted in priority along the elementary edges with the interval (step) of the elementary size. To facilitate the convergence of the process, the interpolation technique is employed to evaluate the solution more accurately. Finally, three numerical examples are presented to demonstrate the validity of the sensitivity analysis and the effectiveness of the optimization method. Copyright Β© 2004 John Wiley & Sons, Ltd.

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