直升机尾传轴系相对位置变化下啮合力分析

Analysis of Meshing Force of Helicopter Tail Drive System During Relative Position Changes of Shafting

直升机传动系统轴系结构复杂,轴系的相对位置变化将影响整个传动系统传递特性,文中以某型直升机尾传动系统——轴系相互垂直的螺旋锥齿轮系为对象,开展轴系相对位置变化下齿轮对啮合力变化特性研究。通过建立尾传轴系相对位置变化的动力学模型,结合多体动力学软件,仿真分析了不同轴系相对位置变化量、不同载荷、不同转速下,齿轮副啮合力变化规律。结果表明:平均啮合力随偏移位置增大而减小,随倾斜位置增大而增大;轴系的倾斜位置变化较偏移位置变化对齿轮啮合特性影响更大。本研究为直升机尾传动系统运行状态监测提供理论依据,对提高直升机传动系统运行稳定性,确保其安全高效运行等有着重要意义。

The shafting structure of helicopter transmission system is complex,then its relative position changes will affect the transfer characteristics of the whole transmission system.Using tail drive system of a certain helicopter-a pair of spiral bevel gears system with perpendicular shafts as the study object,the variation characteristics of the gear pair meshing force under relative position changes of shafting are studied.By establishing a dynamics model of the pair of spiral bevel gears system with relative position chan ges of shafting,and combining with the multi-body dynamics software,the variation characteristics of the gear pair meshing force are simulated and analyzed.The results show that the average meshing force decreases with the increase of offset position changes,and increases with the increase of inclined angle position changes.The inclined angle position changes have more serious influence on gear meshing characteristics than the offset position changes.This research can provide a theoretical basis for condition monitoring of helicopter tail drive system,and it is important to improve the stability of the helicopter transmission system and ensure its safe and efficient operation.