诱导速度分布和挥舞摆振耦合对旋翼气动导数和直升机稳定性的影响

符号 β_0、β_0 β_s和ξ_0、ξ_0、ξ_0分别为挥舞和摆振系数f_β、f_ξ挥舞和摆振弯曲振型函数ω_x、ω_z直升机滚转和俯仰角速度Ω旋翼转速μ_x、μ_y、μ_z飞行状态特性系数.

THE INFLUENCES OF THE INDUCED VELOCITY DISTRIBUTION AND THE FLAPPING-LAGGING COUPLING ON THE DERIVATION OF THE ROTOR AND STABILITY OF THE HELICOPTER

The derivatives of the rotor are very important in the studies of the stability and control. Generally, the models considered in studies of the stability of the helicopter include only the flapping motion and the induced velocity with simple distribution.In this paper, the first harmonic variation of induced velocity distribution derived by Wang's generalized vortex theory is taken into account in detial, and the coupling of the first flapping-lagging bending mode of the blade elasticity is also considered.A sample calculation of a typical helicopter have been made. The influences of the induced velocity distribution and the coupling flapping-lagging on the derivatives of the rotor and the stability of the helicopter is described and drawn in detail, in particular, the derivatives of the rotor with u parameter. All the basic mechanical expressions of the hingeless rotor are presented.