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工程力学  2015 

平流层飞艇充气柔性膜结构的区间不确定优化

DOI: 10.6052/j.issn.1000-4750.2013.11.1010, PP. 234-243

Keywords: 平流层飞艇,充气膜结构,非线性,大变形,不确定性优化

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Abstract:

根据随体坐标描述法,以变形后的构型作为参考基准,研究构建准确的充气膜结构应变/位移几何关系。利用虚功原理建立平衡方程,同时使用更新的拉格朗日格式(UL格式)保证膜结构分析求解的精度和稳定性。在充气柔性膜结构的分析和优化中引入不确定性参数,通过区间数学理论对其进行刻画。基于区间不确定性优化的模型和算法,对充气膜结构进行区间可靠性优化,为提高膜结构在复杂工况下的可靠性,降低失效概率提供借鉴和参考。

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