汽轮发电机组扭振引起疲劳损伤评价  

Evaluation of fatigue damage of turbine generator shafting caused by torsional vibration

作　　者：翁建明 徐云柯 赵鹏程 沙万里 何新有 WENG Jianming;XUYunke;ZHAO Pengcheng;SHAWanli;HE Xinyou(Zhejiang Zheneng Jiahua Power Generation Co.,Ltd.,Jiaxing 314201,China;School of Energy,Power and Mechanical Engmeering,North China Electric Power University Beijing 102206,China)

机构地区：[1]浙江浙能嘉华发电有限公司,浙江嘉兴314201 [2]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《热力发电》2020年第1期91-97,共7页Thermal Power Generation

摘　　要：传统PSCAD/EMTDC仿真中轴系采用简单集中质量模型,难以准确描述轴系扭振特性,并且无法获取局部动态响应过程。本文在PSCAD仿真中建立了轴系的多段集中质量模型模块,更加准确仿真机网耦合振荡过程并获得局部扭应力响应;建立联轴器的有限元模型,对于不同工况下螺栓和螺孔的受力情况进行分析。结果表明,对轴系疲劳分析过程中的SN曲线进行修正,可以使得最终疲劳损伤评估计算结果更加准确。In conventional torsional vibration simulation study by PSCAD/EMTDC,the simplified lumped massspring shaft model is adopted,but it is difficult to describe the torsional vibration characteristics of the shafting system and the detailed dynamic mfbrmation of the shaft can hardly be obtained・In this paper,to remedy such a simulation,the multi-segment centralized mass model module of shafting is established in PSCAD simulation,which can more accurately simulate the torsional interaction oscillation of the machine network and obtain the local torsional stress response.In addition,the finite element model of coupling is built to analyze the torsional force of the bolts and screw hole.The results show that,correcting the S-N curves during the shafting system fatigue analysis can make the final fatigue damage assessment and calculation results more accurate.

关 键 词：汽轮发电机组 扭振 联合仿真 有限元分析 S-N曲线 疲劳损伤 

分 类 号：TK268.1[动力工程及工程热物理—动力机械及工程]