Optimization Design of Short Shell Structure of Rocket Fuel Tank Based on Kriging Surrogate Model

Abstract

Abstract Aiming at the weight reduction optimal design of short shell structure of rocket fuel tank, this paper deals with the structural optimization under the action of axial load. First, the accuracy of equivalent stiffness method is verified by post-buckling analysis of short shell in ABAQUS. Then, according to the parametric model of short shell, based on Kriging surrogate model and EGO algorithm, the optimal structure without and with fillet are obtained under the given design load. Finally, a parametric study is carried out on the influence of fillet on the bearing capacity per unit mass of short shell. The results show that when the width of rib or the spacing of transverse rib is small, and the height of rib, the thickness of skin or the spacing of longitudinal rib is large, processing large fillet for load-bearing purpose is less beneficial or even disadvantageous.