旋翼桨叶载荷与桨叶结构参数相关性研究

Correlation Study for Blade Loads and Blade Structure Properties of Rotor

基于CAMRAD Ⅱ软件,建立自由尾迹耦合柔性多体动力学的弹性桨叶结构载荷分析模型,针对某直升机旋翼桨叶结构设计与载荷分析问题,开展桨叶结构参数与桨叶载荷水平的相关性研究。通过典型飞行状态,包括超扭状态和大前进比前飞状态,研究桨叶剖面挥舞刚度、摆振刚度、扭转刚度等参数的变化对桨叶挥舞与摆振方向载荷水平的影响,并分析由结构共振引起的桨叶载荷突增现象。

This paper presented predictions of blade structure loads using free wake model and flexi- ble multibody dynamics method based on the CAMRAD II software. The research was focused on the problem of structure design and predictions of blade structure loads, and the relationship of blade structure properties and strttcture loads was studied. Two typical flight conditions were investigated including over- torque ease and high speed case. The blade section properties, such as flap ben- ding stiffness, lag bending stiffness and torsion stiffness were changed to observe how the loads changed. Meanwhile, the resonance phenomenon of blade loads was revealed.