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| Morphological analysis and experimental validation of Helium bags of a cargo airship based on fluid-structure coupling |
| AKRAM Samy1，YUAN Xingfei1，CHEN Wujun2，WANG Xueming3，ZHANG Daxu2 |
1.Space Structures Research Center, Zhejiang University, Hangzhou 310058, China;
2.Space Structures Research Center, Shanghai Jiao Tong University, Shanghai 200240, China;
3.China Special Vehicle Research Institute, Jingmen 448035, China |
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Abstract In order to investigate morphological variations of unsaturated floating Helium bags in the ascending/descending and keeping flight of a rigid cargo airship, a scaled Helium bag model was fabricated.Structural dynamic analysis of Helium bag membrane structure was performed based on the vector form of the intrinsic finite element (VFIFE) method, considering geometric large deformation and boundary nonlinearity; fluid dynamics analysis of Helium domain and air domain was modeled with the finite element method.The governing equations were separately solved by self-programmed MATLAB code and ANSYS Flotran module respectively, and the data were transferred between the computational structural dynamics (CSD) and computational fluid dynamics (CFD) through the mapping grid to realize two-way fluid structure coupling.Finally, the scaled model test of the Helium bag was carried out.And the experimental displacement from the Helium bag during the deflation process was compared with the numerical simulation results.The results show that the morphological changes of the Helium bag under different filling ratio are in good agreement with the two-way fluid structure coupling analysis.It validates applicability of the numerical simulation method in the simulation of unstable morphological stage caused by the change of filling ratio.
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Received: 17 October 2019
Published: 28 February 2021
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