具有复合材料柔性梁的无轴承旋翼气动弹性稳定性

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (22) : 151-156.

论文

具有复合材料柔性梁的无轴承旋翼气动弹性稳定性

高文杰

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AEROELASTIC STABILITY OF A BEARINGLESS ROTOR WITH A COMPOSITE FLEXBEAM IN HOVER

Gao Wen-jie

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摘要

建立了一种悬停状态下无轴承复合材料旋翼气动弹性稳定性分析的新模型。修正了Bauchau的大变形梁理论建立了无轴承复合材料旋翼桨叶的非线性应变-位移关系，根据复合材料的特点推导了桨叶的本构关系并构造了一个新的24自由度梁单元，桨叶视为多路传力系统，应用Hamilton原理建立了桨叶运动的有限元方程，分析了悬停状态下具有复合材料柔性梁无轴承旋翼气动弹性的稳定性。数值计算结果表明：（1）采用本文模型的无轴承旋翼气动弹性稳定性的计算结果与试验数据的吻合程度比传统的中等变形梁理论更好。（2）具有负变距-摆振耦合的复合材料柔性梁结构提高无轴承旋翼气动弹性的稳定性，正变距-摆振耦合的结构降低旋翼气动弹性的稳定性；负的铺层角比相同大小正的铺层角旋翼的气动弹性稳定性更好；铺层厚度减少有利于增加旋翼气动弹性的稳定性。

Abstract

A new approach is presented to analysis aeroelastic stability of a bearingless composite rotor in hover. Nonlinear strain-displacement relations are presented using a large deflection beam theory which is modified from Bauchau’s beam mode. Assuming the stress components in the cross-section are equal to zero, constitutive relations for a composite blade are built. A new 24 degree-of-freedom finite element is developed for analysis and the finite element equations of motion for a blade are obtained from Hamilton’s principle. Aeroelastic stability of a bearingless rotor with a composite flexbeam in hover is investigated. Numerical results show that a negative ply angle stabilizes the first lag mode while a positive ply angle destabilizes the first lag mode. Eastic pitch-lag couplings caused by ply layup of flexbeam have significant effect on aeroelastic stability of a bearingless composite rotor. Negative pitch-lag coupling has a stabilizing effect on the lag mode damping. Positive pitch-lag coupling has a destabilizing effect on the lag mode damping. A reduction in ply thickness increases lag mode stability.

导出引用

高文杰 . 具有复合材料柔性梁的无轴承旋翼气动弹性稳定性[J]. 振动与冲击, 2012, 31(22): 151-156

Gao Wen-jie. AEROELASTIC STABILITY OF A BEARINGLESS ROTOR WITH A COMPOSITE FLEXBEAM IN HOVER[J]. Journal of Vibration and Shock, 2012, 31(22): 151-156