摘要
针对直升机超临界尾传动轴系动力学设计需求,开展了浮动花键-柔性轴系自激振动研究。根据浮动花键联接结构形式,分别建立了花键齿面接触模型以及定位面接触模型。参照某型直升机尾水平传动轴系结构,建立了含有浮动花键、膜片联轴器及转轴的多界面浮动花键-柔性轴系动力学模型,并讨论了花键副摩擦诱导下摩擦因数、外阻尼、不平衡量及转速等对系统自激振动的影响。研究结果表明:随着花键副摩擦因数增加,转轴和花键振动响应逐渐增加;在外阻尼和花键副摩擦满足一定条件时,系统可能发生自激振动;系统发生自激振动时处于超临界转速,其振动频率特征由转轴1阶弯曲频率主导,转速越靠近1阶临界转速,转轴振动响应幅值越高。
In order to meet the dynamic design requirements of a helicopter supercritical tail transmission shafting,the self-excited vibration of the floating spline-flexible shafting was analysed.According to the floating spline connection structure,the spline tooth surface contact model and the positioning surface contact model were established respectively.With reference to the horizontal transmission shafting structure of the helicopter tail,a dynamic model of the multi-interface floating spline-flexible shafting including the floating splines,diaphragm couplings and rotating shaft was established.The effects of friction coefficient,external damping,unbalance and rotational speed on the self-excited vibration of the system were discussed.The results show that with the increase of the friction coefficient of the spline pair,the vibration responses of the rotating shaft and the spline increase gradually;when the external damping and the friction of the spline pair reach certain conditions,the system may have self-excited vibration;when the self-excited vibration occurs,the system is in the state of supercritical speed,and its vibration frequency characteristics are dominated by the 1st-order bending frequency of the rotating shaft,and the closer the speed is to the 1st-order critical speed,the higher the amplitude of the rotating shaft vibration response.
作者
张润泽
马新星
李坚
张振果
朱晔
ZHANG Runze;MA Xinxing;LI Jian;ZHANG Zhenguo;ZHU Ye(AECC Hunan Aviation Powerplant Research Institute,Zhuzhou 412002,China;Institute of Vibration,Shock&Noise,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2024年第18期57-68,共12页
Journal of Vibration and Shock
基金
国家自然科学基金(51975354)。
关键词
转子系统
浮动花键
超临界
自激振动
rotor system
floating spline
supercritical
self-excited vibration
