文档介绍：6th World Congresses of Structural and Multidisciplinary Optimization
Rio de Janeiro, 30 May - 03 June 2005, Brazil
Reliability Based Aircraft Structural Design Optimization with Uncertainty about Probability
Distributions
Erdem Acar and Raphael T. Haftka
Research Assistant, University of Florida, Gainesville, FL, 32611-6250, USA. E-mail: ******@
Distinguished Professor, University of Florida, Gainesville, FL, 32611-6250, USA. E-mail: ******@
Abstract
Probabilistic structural design is beset with a credibility problem. Uncertainties associated with errors in structural and aerody-
namic modeling and quality of construction are not well characterized as statistical distributions. Therefore, many engineers are skep-
tical of the accuracy of failure probability predictions. We propose a probabilistic design optimization method, where the probability
of failure calculation is confined to failure stresses, to take advantage of the fact that statistical characterization of failure stresses is
required by FAA regulations. The stress distribution is condensed into a representative single value by utilizing inverse cumulative
distribution function of the failure stress. The method is demonstrated by performing the weight and safety optimization of a repre-
sentative posed of wing, horizontal tail and vertical tail. It is