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弹性耦合对直升机复合材料桨叶稳定性的影响

, PP. 143-148

Keywords: 直升机,复合材料桨叶,弹性耦合,气弹稳定性

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Abstract:

研究了弹性耦合对复合材料桨叶动特性和气弹稳定性的影响,所采用的结构模型考虑了剪切变形、剖面面外翘曲变形和复合材料弹性耦合。推导出同时考虑剪切和翘曲影响的小应变、中等变形梁的应变2位移关系,并构造出21个自由度梁单元,应用Hamilton原理推导出桨叶运动的有限元方程。在此基础上,对三种不同构型的复合材料桨叶进行固有频率计算和气弹稳定性分析。计算结果表明:尽管复合材料弹性耦合对桨叶固有频率的影响非常小,但却改变了固有振型分布,使桨叶挥舞-摆振-扭转运动之间存在耦合;弹性耦合对桨叶气弹稳定性有很大的影响;正的挥舞2扭转耦合使得摆振一阶稳定性增加,负的挥舞2扭转耦合却使摆振一阶稳定性下降。

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