水轮发电机组轴长对自激振动的影响分析  

The Analysis for the Influence of Shaft Length of Turbine Generating Unit on the Self-Excited Vibration

作　　者：马薇[1] 南海鹏[1] 梁武科[1] 赵道利[1] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048

出　　处：《西安理工大学学报》2011年第2期196-199,共4页Journal of Xi'an University of Technology

基　　金：陕西省科技计划基金资助项目(SJ08E222);陕西省教育厅科学技术研究计划基金资助项目(08JK390)

摘　　要：研究了水轮发电机组轴长与机组临界转速的关系,通过理论分析和计算得知,水轮发电机组轴长对机组一阶临界转速影响甚微,对改变机组自激振动的作用有限。据此结论,对机组轴线进一步检查,通过采取改变相关敏感参数,如适当增加下导轴承间隙以及密封间隙等措施,有效解决了机组的振动问题,避免了无效机组改造给电站带来的巨额损失。长时间的生产运行实践表明,机组运行稳定。This paper studies the relationship between the shaft length of turbine generating unit and the critical rotating speed.It is obtained via theoretical analysis and calculation that the shaft length of turbine generating unit has bad little effect upon the first critical rotating speed,which has a limited effect upon changing self-excited vibration of the unit.Based on this conclusion,the further inspect is made in the unit axis.It has been found that the vibration problem can be solved by adopting changing corelative sensitivity parameters such as appropriately increasing the guide bearing clearance and the sealing clearance so as to avoid the huge losses caused by the invalidated transformation of the generating unit to the hydropower plant.The long-term practice of production operation indicates that the operation of generating unit is stable.

关 键 词：水轮发电机 临界转速 自激振动 轴长 

分 类 号：TK730.32[交通运输工程—轮机工程]