Reliability-Based Optimization and Application of Fuzzy Theory for Robust Structural Design

Chien-Jong Chih; Woe-Chun Liu; R.A.S. Wangsawidjaja

doi:10.6180/jase.1998.1.1.03

Reliability-Based Optimization and Application of Fuzzy Theory for Robust Structural Design

Mechanical Engineering

Chien-Jong Shih¹, Woe-Chun Liu¹ and R.A.S. Wangsawidjaja¹

¹Department of Mechanical Engineering Tamkang University, Tamsui, Taiwan 25137, R.O.C.

Received: January 20, 1998
Accepted: March 30, 1998
Publication Date: March 30, 1998

Download Citation: ||https://doi.org/10.6180/jase.1998.1.1.03

ABSTRACT

This paper present two robust design strategies in structural system that simultaneously optimize the design goal-performance and minimize its performance variability. As a result, the maximization of a predefined goal-reliability indicator is equivalent to the optimization of the goal-performance and the performance variation concurrently. Fuzzy set theory is applied to formulate another way of dealing with such robust designs. Both single and multiple goal problems are investigated with random design variables and probabilistic constraints. This optimization approach can produce the highest goal-reliability, which is higher than that of a fixed goal-performance.

Keywords: Structural optimization, Robust design, Multiobjective fuzzy optimization, Goal reliability.

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