汽轮发电机组轴系扭振模型—四端网络模型的完善

The Improvement of Torsional Vibration Model -Four Terminal Network Model of Turbo-generator Set

四端网络模型是一种精确的低阶分布质量模型 ,在理想化扭振模型基础上 ,从满足现场生产实际角度出发 ,考虑了汽轮发电机组轴系扭振的阻尼和附加惯量的影响 ,对该模型作了进一步完善。详细推导了两种情况下轴系扭振特性传递方程式 ,虽然它们具有相似的方程形式 ,但方程式中的轴系扭振特性参数却是不同的。结合具体算例 ,比较了在不同阻尼系数比情况下 ,机组轴系各阶固有频率的变化。

Four terminal network is a precise model of low stage mass distributed. On the condition of regarding the damping and additional inertial of turbogenerator shafts, the four terminal network model is improved. The transmit characteristic functions of torsional vibration in the two cases are deduced in this paper, and the expression of these functions are similar, but the characteristic parameters in these functions are different. A simulation example is given in the paper, and the changes of characteristic frequencies of shafts' torsional vibration are compared with various damping coefficient.