Double-scale grid stiffened cylindrical shell structure

Abstract

The invention relates to the technical field of aerospace structure main bearing component manufacturing and discloses a double-scale grid stiffened cylindrical shell structure. According to the structure, large-scale ribs are arranged on small-scale ribs of the existing grid stiffened structure. The arranging mode includes one large-scale rib is placed every a plurality of small-scale ribs in the circumferential and the axial directions, and therefore a staggered distribution pattern of the large-scale ribs and the small-scale ribs is formed. According to the structure, the large-scale ribs are arranged on the existing grid stiffened structure, the defect robustness of the existing grid stiffened cylindrical shell is improved, large ultimate bearing capacity reduction can be avoided during slight defects, and simultaneously, the ultimate bearing capacity is converged gradually to a certain value as the increase of the defect range. The amount, depth and width of sections of the large-scale ribs and the small-scale ribs can be determined by a numerical optimization method according to indicators of the diameter, length and the like of the structure. The structure is simple in processing technology and suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of manufacturing main load-bearing components of aerospace structures, and relates to the actual bearing capacity of grid-reinforced structures, in particular to a double-scale grid-reinforced cylindrical shell structure. Structural forms with reduced structural bearing capacity. Background technique [0002] The carrying capacity of a launch vehicle, ie the payload of a launch vehicle, is a very important aspect of its design. Reducing the weight of the launch vehicle rocket body can achieve the purpose of increasing the payload. Reducing the weight of the rocket body structural cabin is very effective in improving the payload of the launch vehicle. At the same time, the lightweight design of the structure has significant significance for reducing the launch cost. The structure of the rocket body structure cabin section is composed of a front bottom, a shell section, and a rear bottom. The shell section is...

AI Technical Summary

Problems solved by technology

The results show that the defect robustness of the light tube shell structure is extremely poor, and a small defect can cause a large reduction in the ultimate bearing capacity of the structure. With the increase of the defect amplitude, the ultimate bearing capacity decreases almost linearly; After sparse ribs, the structural robustness under slight defects is higher, but with the increase of the defect amplitude, the ultimate bearing capacity decreases linearly; after dense ribs are arranged for the light cylinder shell structure, the ultimate bearing capacity of the structure under slight defects remains the same. There is a large reduction, but with the increase of the defect range, the ultimate bearing capacity converges to a certain value

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