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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2017, Vol. 38 ›› Issue (2): 220379-220387.doi: 10.7527/S1000-6893.2016.0209

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

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

WANG Bo, TIAN Kuo, ZHENG Yanbing, HAO Peng, ZHANG Ke   

  1. State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, China
  • Received:2016-04-27 Revised:2016-07-06 Online:2017-02-15 Published:2016-08-15
  • Supported by:

    National Basic Research Program of China (2014CB049000); National Natural Science Foundation of China (11372062, 11402049); China Postdoctoral Science Foundation (2015T80246); "111" Project (B14013)

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

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