摘要
套齿连接结构广泛用于发动机低压转子的连接,其刚度/阻尼特性是影响转子动力学的关键。本文以航空发动机柔性套齿连接结构为研究对象,在定性分析其阻尼产生过程的基础上,结合迟滞回线建立了其刚度/阻尼特性的评估参数和计算方法,构建了典型柔性套齿连接结构非线性有限元仿真模型,全面揭示了其力学特性变化规律及其内在物理机制。结果表明:随着套齿连接结构的内外轴相对位移幅值增加,结构等效刚度逐渐下降,损耗因子呈现先快速增加后缓慢增加的变化规律;等效刚度主要受啮合齿接触面积影响,损耗因子变化规律则与接触面积变化速率密切相关,等效黏性阻尼系数随相对位移幅值增加先增加后降低。在参数影响规律上,摩擦系数、扭矩和齿宽对等效刚度的影响规律一致,但对损耗因子的影响规律有所区别。
The spline coupling structure is widely used to connect low-pressure rotors of engines,and its stiffness and damping characteristics are the key factors affecting rotor dynamics.The aero engine flexible spline coupling structure is taken as the research object in this paper.Based on qualitative analysis of the generation of the flexible spline coupling’s damping,the evaluation parameters and calculation method of its stiffness and damping characteristics are proposed with the hysteresis loop under cyclic load.Further,the nonlinear finite ele⁃ment simulation model of a typical flexible spline coupling structure is established.The mechanical characteris⁃tics and internal physical mechanism of the spline coupling structure are fully revealed,and the influence laws of key parameters are analyzed.The results show that the equivalent stiffness of the spline coupling structure de⁃creases with the increase of the relative displacement amplitude of internal and external axes.And the loss factor showed the characteristics of rapid increase-slow increase.The equivalent stiffness is mainly affected by the con⁃tact area of the meshing teeth,and the change of the loss factor is closely related to the change rate of the contact area.With the increase of relative displacement amplitude,the equivalent viscous damping coefficient increases first and then decreases.The effects of friction coefficient,torque and tooth width on the equivalent stiffness are the same,but the effects on the loss factor are different.
作者
蒋科
于平超
郑华强
陶玄君
蒋紫菡
李爽
JIANG Ke;YU Pingchao;ZHENG Huaqiang;TAO Xuanjun;JIANG Zihan;LI Shuang(College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Key Laboratory of Civil Aviation Aircraft Health Monitoring and Intelligent Maintenance,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;AECC Hunan Aviation Powerplant Research Institute,Zhuzhou 412002,China)
出处
《推进技术》
北大核心
2025年第9期273-287,共15页
Journal of Propulsion Technology
基金
国家自然科学基金(52372387)
民航飞机健康监测与智能维护重点实验室自主基金专项资金(NJ2024022)
江苏省自然科学基金(BK20211187)
南京航空航天大学研究生科研与实践创新计划项目(xcxjh20240721)。
关键词
航空发动机
转子动力学
套齿连接结构
迟滞曲线
等效刚度
损耗因子
Aero-engine
Rotor dynamics
Spline coupling structure
Hysteretic curve
Equivalent stiffness
Loss factor
