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建立了具有普遍性的考虑直升机空间机动飞行的尾传动轴动力学模型.分析了机动飞行对尾传动轴临界转速的影响,发现只有俯仰角速度、偏航角速度、横滚角速度和角加速度4个转动运动分量会影响尾传动轴的临界转速.通过算例着重分析了俯仰、偏航和横滚角速度对尾传动轴前3阶临界转速的影响规律.结果表明:俯仰角速度使尾传动轴的临界转速降低,但只对反进动第1阶临界转速有较大影响;偏航角速度对尾传动轴临界转速的影响效果与俯仰角速度完全相同;正向横滚角速度使尾传动轴的正进动临界转速提高,而使反进动临界转速降低;但对于反向横滚,在以横滚角速度等于某值的分界线之前,横滚角速度对尾传动轴临界转速的影响规律与正向横滚相反,前3阶临界转速变化曲线的分界线对应的横滚角速度分别为1.86,27.41,124.5rad/s.
A universal dynamic model of the rear propeller shaft considering helicopter space maneuver flight is established.The influence of maneuvering flight on the critical speed of the rear propeller shaft is analyzed and it is found that only the four rotations of pitch velocity, yaw rate, roll angular velocity and angular acceleration The influence of the pitch, yaw and roll angular velocity on the critical speed of the first three stages of the rear drive shaft is analyzed emphatically through the example.Experimental results show that the critical speed of the tail shaft But only has a significant effect on the first-order critical speed of anti-precession. The effect of the yaw rate on the critical speed of the final drive shaft is exactly the same as that of the pitch speed. The positive roll angular speed causes the forward drive threshold of the rear drive shaft However, for the reverse roll, the influence of the roll angular velocity on the critical speed of the rear propeller shaft is the opposite to that of the forward roll before the boundary line at which the roll angular velocity equals a certain value , The first three critical speed curve of the boundary line corresponding to the roll angular velocity were 1.86,27.41,124.5 rad / s.