推力和阻力作用下柔性自旋飞行器稳定性分析

The dynamics stability under thrust and drag load is researched for dynamics stability of a flexible spinning vehicle. Spinning vehicle is simplified as a non-uniform free-free Timoshenko beam model considering gyroscopic effect. The transverse vibration equation of spinning vehicle in the transient coordinate system is derived using rotor dynamics theory and finite element method. Dynamic stability and transverse vibration response effect of flexible spinning vehicle in the mean axis system and the transient coordinate system are analyzed from spinning speed, thrust and drag. Results show that the drag can be used to improve the stability of spinning vehicle, and the spinning speed has no effect on the instability region in the transient coordinate system; in the mean axis system, the drag leads to the reduction in the stability of vehicle and the decrease in critical thrust and critical speed, and the spinning speed can result in the increase in instability region and make the static instability become the dynamic instability. The moment of inertia and shear effect reduce the system stability. The shear effect has a greater influence especially on the second-order frequency compared with the moment of inertia of transient coordinate system.