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工程力学  2015 

大尺度刚柔组合飞艇结构的静动态力学性能分析

DOI: 10.6052/j.issn.1000-4750.2013.12.1215, PP. 219-228

Keywords: 大尺度飞艇结构,刚柔组合体,力学性能,等效模型,附加质量,模态分析

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Abstract:

刚柔组合体的大变形行为和复杂连接接触给飞艇大尺度结构的力学分析、设计和制造带来了挑战。该文选择德国先进的ZeppelinNT飞艇作为研究对象,飞艇结构由内部骨架与外部蒙皮连接而成,是典型的刚柔组合体结构。飞艇骨架的主要结构单元为桁架梁,若采用精细化模型,建模工作量大,因此通过对代表性桁架梁进行精细化分析,得出梁的截面力学参数,建立了等效简化梁模型,使得计算成本大为降低。为了验证有限元方法对柔性结构模态分析的适用性,推导了无限长圆柱形膜结构的二维振动模态频率理论解,并与有限元模拟得到的数值结果进行比较,两者误差较小。将蒙皮振动引起周围空气运动的附加质量引入有限元分析模型,得到蒙皮与骨架结构合理的模态振动频率。该文建立了大尺度刚柔组合飞艇结构的力学分析方法,并验证了方法的可行性。

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