超大直径网格加筋筒壳快速屈曲分析方法

doi:10.7527/S1000-6893.2016.0209

Abstract

Abstract:

A rapid buckling analysis method is proposed in this paper for large-scale grid-stiffened cylindrical shells used in heavy-lift launch vehicles and large aircrafts. The analysis framework is established by combining asymptotic homogenization method with Rayleigh-Ritz method. A comparison with the buckling load results by smeared stiffener method demonstrates the high prediction accuracy of the proposed method. Evaluation of the analysis efficiency of grid-stiffened cylindrical shells in three different model scales shows that the average computational time by rapid buckling analysis method is only 6 s and which is not inftuenced by the model scale, highlighting the efficiency of the proposed method for large-scale structures. The widespread grid applicability of this method for four traditional grid types and two complicated hierarchical grid types is validated, and their prediction errors are all below 3.0%. Optimizations are performed to compare the load-carrying efficiency of these six grid types. Optimization results illustrate that the proposed hierarchical triangle grid type achieves an increase of load-carrying efficiency by 82.2% than the initial design, and can be considered as an innovative grid type for large-scale grid-stiffened cylindrical shells.

Key words: grid-stiffened cylindrical shell, asymptotic homogenization method, Rayleigh-Ritz method, buckling analysis, optimization design

CLC Number:

WANG Bo, TIAN Kuo, ZHENG Yanbing, HAO Peng, ZHANG Ke. A rapid buckling analysis method for large-scale grid-stiffened cylindrical shells[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(2): 220379-220387.

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A rapid buckling analysis method for large-scale grid-stiffened cylindrical shells

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