计及诱速和风切变的直升机自转前飞特性

研究直升机自转前飞时在风切变条件下的稳定性和操纵性。风切变采用非线性模型，旋翼模型考虑桨叶的刚性挥舞运动，桨叶根部具有水平铰外伸量和弹性约束，诱速在桨盘处的分布采用固定涡系所表示的诱速非均匀分布模型，以Ｚ９飞机为算例，算出计及风切变与否的自转前飞平衡参数和稳定根及操纵响应，显示了风切变对自转前飞操稳特性的影响。

The Control and Stability of Helicopters in Autorotation Forward Flight with Windshear and Induced Velocity

A method is given to calculate the control and stability of helicopters in autorotation forward flight with windshear. Two models are used in this article, one is nonlinear windshear model, the other is rotor model, in which rigid flapping motion of blade and a blade hinge offset from the center of rotation with a spring above the flapping hinge is considered. The nonuniform distribution of induced velocity on the rotor disk which derived from wang's fixed vortex theory is taken into account. In this paper,Z9 helicopter is taken as an example. The calculation of helicopter trim, stability and control in autorotation forward flight with windshear have been made. The result are presented.