考虑温度效应的风电增速箱动力学特性研究

针对风电增速齿轮箱温度异常现象,基于Block闪温理论与Hertz接触理论,提出一种考虑随机风载作用下齿面接触温度的计算方法.以该方法为理论基础,根据行星轮系耦合建模理论,建立风电增速齿轮箱动力学性能计算模型.模型不仅揭示了随机风载、齿面接触温度及齿廓热变形之间相互影响的函数关系,还展现了随机风载、齿面接触温度等非线性因素对风电增速箱动态响应的影响.结果表明,风电增速箱输入载荷的随机动态变化特性将引起其齿面的接触温度在一定范围内发生波动.这种动态的齿面接触温度将会导致齿轮齿廓产生热变形,进而影响齿轮的时变啮合刚度,最终对增速箱的动态特性产生影响.研究可为解释风电增速齿轮箱的温度异常现象提供理论参考依据.

Study on dynamic characteristics of wind power speed-increasing box considering temperature effect

Aiming at the abnormal temperature phenomenon of wind power speed-increasing gearbox, based on Block flash temperature theory and Hertz contact theory, a calculation method considering the contact temperature of tooth surface under random wind load is proposed. Based on this method, and according to the coupling modeling theory of planetary gear trains, a calculation model for the dynamic performance of the wind power speed-increasing gearbox is established. The model not only reveals the functional relationship between random wind load, tooth surface contact temperature and tooth profile thermal deformation, but also shows the effect of non-linear factors such as random wind load and tooth surface contact temperature on the dynamic response of wind power gearboxes. The results show that the random dynamic change characteristics of the input load of the wind power speed-increasing box will cause the contact temperature of the tooth surface to fluctuate within a certain range. The dynamic tooth surface contact temperature will cause thermal deformation of the gear tooth profile, thereby affecting the time-varying meshing stiffness of the gear, and ultimately affecting the dynamic characteristics of the gearbox. This study may provide a theoretical reference for solving the abnormal temperature phenomenon of wind power speed-increasing gearboxes.