悬挂式跷跷板旋翼桨叶拉力载荷的一种工程算法

在一阶诱导速度分布，一阶周期变距，三阶挥舞运动的基本假定下，提出了一种悬挂式跷跷板旋翼桨叶挥舞面内拉力载荷的工程算法。为此，首先推导了含有悬挂高度和桨叶预锥角影响的这类桨叶的挥舞运动方程。并用“法方程法”及“共轭斜量法”求解了一种属于矛盾方程的挥舞运动系数方程组，取得一致结果。随后，导出了气动拉力载荷表达式。最后，以××无人驾驶直升机悬挂式跷跷板旋翼桨叶为算例，计算了拉力载荷并分析了悬挂高度和预锥角对挥舞运动系数的影响关系。

A ENGINEERING ALGORITHM OF THRUST LOADS FOR THE HANGING TEETERING ROTOR

A engineering algorithm of thrust loads for the hanging teetering rotor is presented on the assumption that first induced velocity distribution,first cyclic pitch motion and three harmonics of flap motion in this paper.The flap motion equation for this rotor blade is established,in which the effects of the hang height and the blade precone angle are included.The equations of blade flap motion coefficients are a set of contradiction equations,and are calculated by means of the normal equation method and the conjugate gradient method.The correlation between the two calculations is good.The representation form of rotor aerodynamic thrust loads is founded.As examples,the calculations of thrust loads of the hanging teetering rotor for the remote pilotless helicopter are performed at the end.The effects of the hang height and blade precone angle are analyzed for the blade flap motion coefficients.