Reliability Based Multi-disciplinary Design Optimization

Jang Hyuk Kwon, Suwhan Kim and Joongki Ahn

Korea Advanced Institute of Science and Technology

373-1 Guseong-dong, Yuseong-gu, Daejeon, 305-701, Korea

Tel: +82-42-869-3715, jhkwon@kaist.ac.kr

Multi-disciplinary Design Optimization (MDO) is the design method that integrates unit analysis technologies to contain complex interactions and it wishes to manage various phenomena that occur in manufacturing and to get a better shape compared with the reference shape. Reliability based Design Optimization (RBDO) is the design technology that considers uncertainties of the actual manufacturing of product or operating conditions and keeps the performance of product by the wanted level. That is, it wishes to raise the stability about the optimized shape through the technique that adds forced uncertainties about process errors in the existent deterministic design optimization methods. Recently there have been much efforts to combine MDO and RBDO.

In this paper, an efficient strategy for Reliability Based Multi-disciplinary Design Optimization (RBMDO) will be presented with examples to verify. Then the shape design optimization for a flexible aircraft wing will be presented. The flexible wing considers the structural deflection generated by the aerodynamic properties and describes the interaction between aerodynamics and structures through the static aero-elasticity. For the multi-disciplinary optimization, aerodynamic properties such as lift and drag coefficients and structural properties such as deflection and stresses are in the optimization formulation. For the reliability consideration, the first order reliability method(FORM) is used.