水轮机组结构-液体系统的动态特性分析

Dynamic Behavior of Structure-Liquid System of Hydraulic Turbines

讨论了耦合系统自由振动的控制方程 ,着重对动水压力向量及附加质量阵的计算进行阐述 ,并对在水介质下的结构的动态特性计算的求解方法作简要说明 ,最后介绍一个实用例子得出的计算成果 ,该例表明考虑液体影响得出的机组自振频率比不考虑液体影响所得值明显下降 。

This paper discusses the free vibration governing equations of a coupled system with the emphasis on the calculation of dynamic water pressure vectors and the added mass matrix. It also makes a brief introduction about the solution of the dynamic behavior of structures under water medium. The calculation results obtained from a practical example are presented, which show that the basic frequency of the turbine obtained with the structure liquid coupling effect taken into consideration is less than that without the coupling effect, and that all the modes of vibration are obviously different from each other.