机动飞行下机载磁悬浮转子振动响应

Vibration Response of Airborne Magnetic Levitation Rotor under Maneuvering Flight

为了探究机动飞行对机载磁悬浮转子振动响应的影响,建立了飞机机动飞行下柔性转子的运动微分方程和磁悬浮轴承模型,使用基础运动的6个参数描述了飞机转弯和俯冲拉升2种机动飞行的完整过程,对1个磁悬浮轴承支承的单盘柔性转子进行了振动响应数值计算分析。仿真结果表明:采用比例-微分控制的磁悬浮轴承转子系统在飞机转弯和俯冲拉升时,转子进动中心会随着机动飞行过程发生偏移,转子振动增大,可能与磁悬浮轴承发生碰摩故障;采用比例-积分-微分控制时,磁悬浮轴承可以以增大控制电流为代价减小机动飞行对转子振动的影响。为了实现磁悬浮轴承在航空发动机等机载旋转机械上的应用,在磁悬浮转子系统设计时要充分考虑机动飞行对振动响应的影响。

In order to investigate the influence of maneuvering flight on vibration response of airborne magnetic levitation rotor,the motion differential equation and magnetic bearing model of flexible rotor were established under maneuvering flight. Six basic motion parameters were used to describe the complete flight process of aircraft turning,diving and pulling up. The vibration response of a single-disk flexible rotor supported by magnetic bearing was numerically analyzed. The simulation results show that the precession center of the magnetic bearing rotor system with proportional-derivative control will shift with the maneuvering flight process when the aircraft is turning,diving and pulling up, while the vibration of rotor increases,magnetic bearing rubbing fault may occur. When proportional-integral-derivative control is adopted,the influence of maneuvering flight on rotor vibration can be reduced at the cost of control current increasing. For airborne application of magnetic bearing in rotating machinery such as aeroengine,the influence of maneuvering flight on vibration response should be fully considered in the design of magnetic levitation rotor system.