弹性支撑下风电机组传动系统结构动力分析

ANALYSIS OF MOUNTING ON DRIVE TRAIN STRUCTURAL DYNAMICAL SPECIALITY OF A WIND TURBINE

考虑水平轴风力发电机组齿轮箱弹性支撑的柔性连接特性,基于集中质量思想和拉格朗日方法,建立风力发电机传动系统多体动力学模型,研究了齿轮箱弹性支撑对传动系统结构动力学特性的影响.利用动力学模型和模态分析方法,得到了由弹性支撑耦合到系统后的模态频率,并获取了在该模态激励下的模态动能分布.采用变参数方法进行传动系统模态对齿轮箱弹性支撑刚度变化的敏感性分析,利用模态叠加法进行齿轮箱体的动响应分析.数值求解结果和分析表明,考虑齿轮箱弹性支撑的传动系统某阶固有频率即为弹性支撑下齿轮箱体振动主模态;弹性支撑线刚度对传动系统低频率固有模态存在一定影响;齿轮箱体振动分析时应考虑1阶和2阶的低频模态较为合理.本研究工作对传动链系统方案可靠性设计和抑制传动链振动的加阻控制提供了一定理论基础.

A wind turbine multi-body dynamics model, which based on lumped mass method and Lagrange equa- tions, has been built to research the elastic mounting of the gearbox effect on the dynamics characteristics of the drive train after considering the flexible connection characteristics of the gearbox elastic mounting in the horizontal axis wind turbine. With the help of the dynamic model and the modal analysis method, the modal natural fre- quency has been obtained after coupling the system with gearbox elastic supporting, and the modal energy distri- bution by this method has been gotten. Using variable parameter of the gearbox elastic mounting, sensitivity of the drive train modal characteristics analysis is performed, and the dynamic response of gearbox housing is calcu- lated with mode superposition method. Numerical solution and analysis show that the modal natural frequency of the drive train system is the main gearbox mounting vibration modal caused by the gearbox elastic mounting, Lin- ear stiffness of the mounting has an impact on the low natural frequency of the drive train, It is reasonable to con- sider the first and second order modal of the This research provides a theoretical basis on suppress the vibration of the drive train system when doing the vibration analysis of the gearbox mounting. the reliability design of the drive train and damped control which