Integration of equivalent model within reliability-based design optimization for reducing freedom degrees in dynamic structures

The Reliability-Based Design Optimization (RBDO) seeks to find the best compromise between cost and safety levels. This model often needs a very high computing time and leads to weak convergence stability. A hybrid method has been proposed to overcome these difficulties. However, when applying on real dynamic cases, we have a big number of degrees of freedom. In this paper, we present an efficient method using the equivalent model technique with object of reducing the degree of freedom.