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讨论了大型水轮发电机组主轴系统的建模问题，建立了一个具有局部非线性的多自由度轴系模型。各个导轴承的油膜作为非线性元件，并考虑回转效应、摆动惯性、剪切效应、发电机的电磁拉力、水的附加惯性等因素以及作用在轴上任意形式的机械、电磁和水动的激励力。瞬态响应的计算综合采用了Ｒｉｃｃａｔｉ传递矩阵法和Ｎｅｗｍａｒｋ－β数值积分法。推导了求解瞬态响应的公式，编制了通用的计算软件。以湖南凌源五强溪电厂的２４０ＭＷ大型水轮发电机组轴系为实例，给出了计算结果和讨论，为大型水轮发电机组的稳定性研究提供参考和技术支持。
The modeling problem of the main shaft system of a large hydroelectric generating set is discussed. A multi-degree-freedom shaft system model with local nonlinearity is established. The oil film of each guide bearing acts as a non-linear element and takes into account such factors as slewing effect, oscillating inertia, shearing effect, electromagnetic pull force of the generator, additional inertia of the water, and any mechanical, electromagnetic and hydro-motive forces acting on the shaft force. The transient response calculation uses the Riccati transfer matrix method and the Newmark-β numerical integration method. The formula to solve the transient response is deduced and a general calculation software is compiled. Taking the 240MW large hydrogenerator shaft of Lingqiang Wuqiangxi Power Plant in Hunan as an example, the calculation results and discussions are given to provide reference and technical support for the stability research of large hydrogenerator units.