汽轮发电机基座分析中转子动扰力计算方法改进研究  

Research on Improving the Calculation Method of Rotor Dynamic Disturbance in the Analysis of Turbine Generator Foundation

作　　者：刘森林 周光炳 LIU Senlin;ZHOU Guangbing(Southwest Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Chengdu 610021,China)

机构地区：[1]中国电力工程顾问集团西南电力设计院有限公司,四川成都610021

出　　处：《电力勘测设计》2025年第3期63-69,共7页Electric Power Survey & Design

基　　金：中国电力工程顾问集团西南电力设计院有限公司科技项目“高烈度百万机组汽轮发电机基座设计研究”(KQ0788)。

摘　　要：汽轮发电机基座良好的动力特性是保证机组平稳运行的重要保障。目前,不论是国家标准还是国际标准均假设动扰力为大小不变,围绕固定的轴承中心呈圆形旋转的离心力。但实际由于轴承处油膜刚度和阻尼的不确定,轴承中心呈现出不规则的轴心轨迹,离心力不再是一个理想的圆形分布。因此,本文基于轴承中心的运动轨迹为类椭圆形,根据转子动力学理论推导出轴心呈类椭圆运动的转子动扰力计算公式。改进后的动扰力更加符合实际情况,并且改进后的动扰力可能增大汽轮发电机基座稳态分析中控制点的振动响应峰值,从而采用改进后的动扰力进行基座动力分析能够更加保证汽轮发电机基座具备良好的动力特性。The good dynamic characteristics of the turbine generator foundation are important guarantees for ensuring the smooth operation of the unit.At present,whether it is the national standard or international standards,it is assumed that the dynamic disturbance force is a centrifugal force that remains constant in size and rotates in a circular shape around a fixed bearing center.But in reality,due to the uncertainty of oil film stiffness and damping at the bearing,the center of the bearing presents an irregular axis trajectory,and the centrifugal force is no longer an ideal circle.Therefore,the motion trajectory of the bearing center is based on a quasi elliptical shape,a formula for calculating the dynamic disturbance force of a rotor with an elliptical axis motion is derived based on rotor dynamics theory.The improved dynamic disturbance force is more in line with the actual situation,and the improved dynamic disturbance force may increase the peak vibration response of the control points in the steady-state analysis of the turbine generator foundation.Therefore,using the improved dynamic disturbance force for foundation dynamic analysis can better ensure that the turbine generator foundation has good dynamic characteristics.

关 键 词：汽轮发电机基座 转子动扰力 稳态分析 

分 类 号：TM621[电气工程—电力系统及自动化]