飞行器机动飞行时发动机转子等变速运动的动力学特性研究

 建立了位于机动飞行器内单盘 Jeffcott转子系统的动力学模型,研究了飞行器飞行速度和加速度变化对飞行器内等加速、等减速两种等变速运行转子振幅响应曲线的影响,模拟了飞行器在垂直平面作正弦曲线轨迹运动时相应的响应曲线。结论表明飞行器的速度和加速度变化会改变飞行器内等变速转子的振幅大小和响应曲线趋势,飞行器在垂直平面作正弦曲线轨迹的机动飞行时,飞行器动作的幅度和周期的影响都很明显。对重力参数和不平衡参数的影响也作了研究。

DYNAMICS OF A MANEUVERING ROTOR IN CONSTANT ACCELERATION AND DECELERATION

The mathematical model of a maneuvering rotor is derived. The dynamical characteristics of a rotor during acceleration and deceleration are studied. The influences of the gravity and balance parameters are also considered. The conclusions show that: (1)if the velocity and acceleration of the aircraft are changed, the amplitude response of the rotor is varied too; (2)the velocity and acceleration of the aircraft in the vertical direction affect the response of the rotor obviously; (3)when the aircraft runs in the way of a sine curve in the vertical plane the response curve is also periodic after one or two periods; (4)in most cases studied in this paper, the response curve, mainly the amplitude value, is influenced by the gravity and unbalance parameters; (5)the response is influenced largely by the amplitude and period of the sine curve when the aircraft maneuvers in the vertical plane. The curve trend may be much different when the initial rotating speed is lower before acceleration or higher before deceleration. The change of gravity affects the trends of the response obviously. The unbalance parameter has little influence. The conclusion can be used to diagnose the faults of the aircraft rotor on line.