【摘要】 直升机在前飞状态下的稳定性研究比悬停时复杂得多。主要针对直升机前飞状态下的空中共振的稳定性加以研究,建立了旋翼和机体的结构模型、气动力模型和平衡方程组;计算和分析了某些典型情况的特征值、特征向量和各自由度之间的相互作用。在方程组的周期系数处理以及前飞时的相关参数对直升机空中共振稳定性的影响等方面进行了研究。从分析各个自由度间的相互作用入手揭示了直升机空中共振的物理本质及影响因素。更多还原

【Abstract】 It is more difficult to investigate the helicopter dynamic stability in forward flight than in hover. Air resonance dynamic stability in forward flight is examined. The structure modeling, aerodynamic modeling and equations of motion of rotor and body are derived. The eigenvalues, eigenvectors and mutual excitation of different degrees of freedom of representative instances are calculated and analyzed. The equations with periodic coefficients are solved. The effect of parameters on air resonance dynamic stability is investigated. The influence of air resonance dynamic stability is investigated through the analysis of mutual excitation of different degrees of freedom.更多还原