Double-level sequential optimization for strength/aeroelasticity comprehensive design of uncertain composite structures

Abstract

Composites have been applied more and more in aviation, which leads to a need of aeroelasticity design of composite structures. In this paper, the aeroelasticity and strength optimization design of composite structures is explored. In view of the low efficiency of the traditional aeroelasticity and strength optimization process, a sequential optimization process of aeroelasticity and strength is proposed, which decouples the aeroelastic analysis from the optimization process, reduces the number of calls of the aeroelastic analysis program, and thus shortens the optimization cycle and improves the optimization efficiency. The reliability design method is compared with the traditional deterministic design method. Considering the dispersion of composite materials, the reliability-based aeroelasticity/strength optimization method of composite structures is established. The uncertainty is introduced into the multidisciplinary optimization of composite structures. In the reliability optimization design, the double-layer sequential method is used to decouple the reliability analysis and aeroelastic analysis from the optimization process, which reduces the number of calls of aeroelastic analysis program and reliability analysis program, and improves the optimization efficiency. Compared with the traditional optimization method based on b-reference value and safety factor, better design results are obtained.