为研究飞艇主气囊结构模态特性，将飞艇内外气体假设为势流体，基于流固耦合理论和势流理论，建立薄膜与内外空气流场共同作用的理论模型。建立充气膜结构数值分析方法，在内、外流场的单面耦合和内外流场的双面耦合三种情况下，对薄膜充气管和模型飞艇进行湿模态分析，对比分析单面和双面气固耦合的分析结果，并通过模态试验对分析方法进行验证，结果表明采用双面耦合分析方法分析充气膜结构湿模态最合理。采用此方法对艇长5m、25m、50m和100m以及长细比为 1:3、1:3.5和1:4的双轴椭球外形飞艇主气囊在多种内压条件下进行湿模态分析，表明固有频率与艇长成反比，而长细比与内压对固有频率影响小。分析结果可以为飞艇的结构设计以及复杂充气膜结构模态分析提供参考。
Abstract
In order to analyze the modal characteristics of airship envelop, the air around the airship envelop is assumed as potential fluid, and based on the FSI (Fluid Structure Interaction) theory and potential flow theory, the theory on membrane and air flow field interaction is presented. Also a numerical method for pneumatic structure modal analysis is applied to study pneumatic membrane tube and airship model. Inner side coupling, outer side coupling and both sides coupling method are considered and compared, and experiments on the same subject demonstrate the validity of these methods. It results that the both sides coupling method is more suitable for pneumatic structure modal analysis. Therefore modal analyses on airship envelop with the slenderness ratios of 1:3, 1:3.5 and 1:4, and the lengths of 5m, 25m, 50m and 100m are completed, and it shows that natural frequency is in inverse proportion to length of airships, while the influence of slenderness ratios and internal pressures is little. The results can provide a reference for airship structure design and modal analysis of complex shape pneumatic membrane.
关键词
飞艇主气囊 /
模态分析 /
势流体 /
湿模态 /
流固耦合
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