基于非对称模型的发电机转子-轴承系统动力特性分析

该文在旋转坐标下建立了发电机非对称转子 -轴承系统的数学模型 ,推导了非对称转子、轮盘和轴承的传递矩阵。针对传统传递矩阵法存在的对多自由度非对称转子 -轴承系统的数值不稳定问题 ,该文在构造系统非对称部件的传递矩阵时 ,引入了Riccati变换 ,使之适合于复杂实际非对称转子动力特性的求解。将这种方法应用于某 6 5 0MW核电发电机转子 轴承系统的动力特性计算 ,计算结果与实验结果吻合的较好 ,证明该方法能解决传统方法不能解决的实际非对称转子 轴承系统动力特性 (临界转速、不平衡响应和稳定性等 )的计算问题 ,为非对称电机转子的设计提供了更准确的计算方法。

DYNAMIC ANALYSIS OF UNSYMMETRICAL GENERATOR-BEARING SYSTEM

In this study, the unsymmetrical model of generator bearing system is presented in the rotating co ordinate and transfer matrices of elements are derived from motion equations of elements using the harmonic balancing method. Due to the calculating instability of the transfer matrix method, Riccati change is introduced to the derivation of transfer matrices, and applied to the dynamic calculation of complex generator bearing system. As an example, this method is employed to the dynamic calculation of a 650MW nuclear power generator bearing system, and the results of calculation and practical experiment are almost the same. It is proved that this method is more accurate and valid for dynamic calculation such as critical speed, unbalance response and instability of complex generator bearing system.