面向缺陷容忍的加筋筒壳快速优化设计

doi:10.7527/S1000-6893.2021.26430

Abstract

Abstract:

To improve the load-bearing efficiency of aerospace equipment structures such as the launch vehicle and realize the lightweight and detailed design of aerospace thin-walled cylindrical shell structures， this study investigates the aerospace thin-walled cylindrical shell structure sensitive to imperfections， designing the stiffened cylindrical shell oriented to imperfection tolerance. By considering the coupling relationship between structural design and critical buckling load and structural imperfection sensitivity in the design process， we simultaneously improve the buckling load and anti-defect ability of the cylindrical shell to realize the detailed design and lightweight design of the shell structure. In addition， in view of the time-consuming single analysis and low optimization efficiency of the imperfection-sensitive stiffened shell， we adopt the incomplete Reduced Stiffness Method （iRSM） instead of the nonlinear explicit post-buckling algorithm to perform the load-bearing analysis of the imperfect stiffened cylindrical shells. An accelerated optimization design framework oriented to imperfection tolerance for the stiffened shell is established based on the iRSM. An orthogonal grid stiffened cylindrical shell structure with a diameter of 1.6 m is taken as an example for illustration. The results show that the design load of optimized results can be improved by more than 10% with the same mass compared with the initial design， thereby effectively improving the bearing efficiency of aerospace stiffened cylindrical shells. Furthermore， the proposed method can reduce the calculation cost by more than 80% while ensuring stable optimization results to realize the efficient optimization design of the imperfection-tolerant stiffened cylindrical shell structure.

Key words: stiffened cylindrical shell, buckling, imperfection sensitivity, axial compression, structural design

CLC Number:

V214

Xiangtao MA, Fayao WANG, Yingjie ZHU, Peng HAO, Bo WANG, Guanri LIU. Accelerated optimization design of stiffened cylindrical shell for imperfection tolerance[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(1): 226430-226430.

Figures/Tables 12

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References 23

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变量	t_s/mm	t_r/mm	h_r/mm	N_A	N_C
上限	2.40	3.75	14.88	168	21
下限	0.80	1.25	8.93	108	13

变量	初始设计	基于iRSM优化设计	基于非线性显式后屈曲优化设计
t_s/mm	1.600	1.588	1.721
t_r/mm	2.500	2.410	1.385
h_r/mm	11.900	14.767	14.578
N_A	138	123	165
N_C	17	13	21
P_SPLA/kN	3 209.3	3 630.5	3 676.2
质量/kg	39.6	39.6	39.6
单次分析耗时/min		2.5	15
优化耗时/h		54	324

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Accelerated optimization design of stiffened cylindrical shell for imperfection tolerance

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