摘要
采用入流模型描述了非均匀定常垂直气流在旋翼上的分布,用改进的非线性VK S模型计算粘弹减摆器的复模量;分析了直升机从悬停到小速度前飞时,定常垂直气流的非均匀分布对直升机平衡操纵以及对系统摆振后退型模态阻尼的影响。分析结果表明:非均匀垂直气流对平衡时的周期变距操纵有较大影响;对减摆器具有非线性特性的直升机来说,非均匀垂直气流对其摆振后退型模态阻尼有显著影响,而减摆器具有线性特性时,则影响很小。
An inflow-type model was applied to reflect steady non-uniform vertical flow on the helicopter rotor. Complex modulus of elastomeric lag dampers was predicted from an improved nonlinear Voigt-Kelvin series model. The influences of non-uniform vertical flow on helicopter trim controls and regressive lag modal damping levels were analyzed in hovering and forward flight. The results demonstrate that the non-uniform vertical flow changes the rotor cyclic pitch controls for trim flight and significantly changes the regressive lag modal damping arising from nonlinear characteristics of blade lag dampers.
出处
《飞行力学》
CSCD
北大核心
2005年第3期32-36,共5页
Flight Dynamics
关键词
直升机
非均匀入流
操纵特性
空中共振
helicopter
nonlinear inflow
control performance
air resonance