特定转速下的风机传动系统动态分析

Dynamic Analysis on Transmission System in Wind Turbine under Certain Rotating Velocity

以三级行星轮系风力传动系统为研究对象,基于非线性多体动力学理论,通过建立系统的集中参数模型研究复杂系统的动态响应。分析表明,在输入转速确定的条件下,考虑系统的啮合刚度与啮合阻尼建立的动力学模型,能够反映系统的非线性运行特性;在多级系统中,轮系中齿轮的周期性由齿轮啮合刚度和其轴承支承刚度决定,并且,其频率响应具有明显的调幅特性,调制波形频率与输入轴旋转频率直接相关。研究对多级行星轮传动系统的振动特性研究、故障诊断具有一定指导意义。

Based on nonlinear multi-body dynamics theory, this paper builds dynamic structure models using Lumped Parameter Method to study dynamic responses of the complex structure in wind turbine transmission system. By the result of frequency and chaos of the responses, the dynamic model which takes meshing stiffness and damping into account is reliable to expound non-linear characteristic. The periodicity of gears are determined by gear meshing stiffness and supporting stiffness, its frequency response has obvious amplitude modulation characteristics, and the frequency of modulation waveform correlate to the rotation frequency of the input shaft. These results provide reference for vibration characteristics analysis and fault diagnosis of the wind turbine transmission system.