汽轮发电机组转子—轮盘—叶片系统耦合扭转振动研究

The Coupled Torsional Vibrations Research of Rotor-blade Disk-vane System in Steam Turbine

在传统的汽轮发电机转子系统强度及振动计算中 ,转子、叶片是分开考虑的 ,忽略了相互间的耦合作用。随着大扭曲长叶片的普遍采用 ,进行精确的转子—轮盘—叶片耦合振动分析对防止叶片、轮盘、转子事故已很有必要 ,本文提出了一种转子、轮系耦合扭转振动的分析方法 ,将耦合系统分为主部件转子和分支部件轮盘—叶片系统 ,分支部件的各阶模态可简化为等效的质量—弹簧系统 ,这样可以将原来大规模耦合振动系统降阶为低阶等效的小规模耦合系统 。

This paper presents an analysis method on coupled torsional vibration of rotor-blade disk-vane system in steam turbine. The coupled system is devided into main part(rotor) and other part(blade-disk-vane system). In the blade disk-vane system each modle is simple as an mass-elastic system. Therefore, the large scale coupled vibrations system is equal as low orders small scale couple system, and the modle are given.