地面开车状态下桨叶频率配置对载荷的影响分析

Analysis on the Effect of Blade Frequency Allocation to Blade Load During Ground Operation

以某模型旋翼为研究对象,开展地面开车状态下桨叶各阶频率与气动激振力频率耦合对桨叶各剖面载荷的影响的研究。绘制了旋翼真空中共振图以及空气中共振图,根据共振图得出旋翼各阶频率与气动激振力频率耦合时的转速。分别计算了孤立旋翼在挥舞、摆振、扭转频率与气动激振力频率耦合转速下地面开车的桨叶各剖面载荷,并与前飞状态进行对比。计算结果表明,在耦合转速下地面开车,桨叶各剖面动载小于前飞时桨叶各剖面动载,不会影响桨叶寿命。

This paper analyzed the effect of blade frequency allocation to blade load during ground operation depend on a model rotor. Presented the resonance graphs both in vacuum and air. Accord- ing to the resonance graph, found the rotation speeds when the rotor frequencies of each order and aerodynamic force frequencies were coupled. Calculated the blade loads of each section during ground operation at the speed when aerodynamic force frequencies were coupled with isolated rotor frequencies of different modes respectively, and contrast with the blade loads during forward flight. The calculation results indicated that, during ground operation, the blade dynamic loads of each sec- tion were smaller compare to that during forward flight, it would not affect the blade life.