半速核电机组轴承座动刚度修正方法探讨

Dynamic Stiffness Correction of Bearing Pedestals in Half-speed Nuclear Power Units

基于三维有限元法,以某半速核电机组为原型,比较分析了轴承座真实支撑动刚度（轴瓦底部）与轴承座上盖法兰面动刚度的比例关系。有限元计算结果表明：在0~25 Hz内,轴承座真实支撑动刚度与轴承座上盖法兰面动刚度存在简单比例关系,可以由上盖法兰面的动刚度实测值推算轴承座的真实支撑刚度。

Based on 3D finite element method and taking the half-speed nuclear power unit as a prototype, the relationship was analyzed between real dynamic stiffness of bearing pedestal （at bushing bottom） and the dynamic stiffness of top head flange. FEA results show that within 0-25 Hz, there is a simple proportional relationship between above two kinds of dynamic stiffness, therefore the real dynamic stiffness of bearing pedestal can be deduced according to actual measurements of the top head flange.