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针对直升机飞行中通过过渡速度时产生的振动、抬头、偏转和倾斜等一系列现象,从旋翼动力学的角度进行了深入的研究,并且给出了系统的解释。首先,分析了旋翼尾涡对直升机状态的影响;然后,研究了桨涡干涉效应,发现桨涡干涉效应导致旋翼前行桨叶平均拉力增加、后行桨叶平均拉力减小,这是引起直升机抬头、倾斜和振动的根本原因;最后,研究了起飞和着陆中通过过渡速度时操纵对策的差异及其原因。
A series of phenomena, such as vibration, head-up, deflection and tilting, which occur during the flight of helicopter through the transitional speed, are studied deeply from the aspect of rotor dynamics and the systematic explanation is given. First of all, the influence of rotor wake on the state of helicopter is analyzed. Then, the interference effect of propeller vortex is studied. It is found that the interference effect of propeller vortex leads to the increase of average pulling force of rotor blade in front and the average pulling force of blade in the rear decreases, The root cause of the rise, tilt and vibration. Finally, the differences between the take-off and landing maneuver strategies and their causes were studied.