计及齿轮分度圆误差的风电齿轮箱振动特性分析

Vibration characteristics research of wind turbine gearbox considering flank pitch error

齿轮分度圆误差下的振动特性研究对齿轮箱的状态监测及故障诊断具有指导意义。为了定量地探究齿轮分度圆误差对齿轮箱振动特性的影响,文章以某平行级直齿轮为研究对象,建立8自由度齿轮传动模型,将齿轮视为变截面悬臂梁处理,得到其理论时变啮合刚度(TVMS)。然后,建立分度圆误差几何模型及其对应的Simpack齿轮箱虚拟样机,对不同转速、不同分度圆误差下的振动信号进行时频域分析。分析结果表明:齿轮箱振动信号对于分度圆误差值的敏感程度与转速有关,转速越大,分度圆误差越大,振动越明显;当分度圆误差值达到0.001 rad时,啮合冲击力约为无误差状态时的3倍。

The research on the vibration characteristics under the tooth flank pitch error has guiding significance for the condition monitoring and fault diagnosis of the gearbox.In order to quantitatively explore the influence of gear indexing circle error on gearbox vibration characteristics,a parallel-level spur gear is taken as the research object,and its 8-degree-offreedom gear transmission model is established.The gear is regarded as a variable cross-section cantilever beam,and its theoretical time varying mesh stiffness(TVMS)is obtained.Then the geometric model of the flank pitch error and its corresponding Simpack gearbox virtual prototypes are established,and the time-frequency domain analysis of the vibration signal under different rotation speeds and flank pitch error values is carried out.The results show that the sensitivity of the gearbox vibration signal to the index circle error value is related to the speed.The greater the speed and the flank pitch error values,the more obvious the gearbox's vibration.When the flank pitch error value reaches 0.001 rad,the impact force is about 3 times of that under none-error state.