摘要
随着核电机组运行年限的增加,小支管的振动疲劳缺陷变得越来越突出,给核电厂的安全、经济运行带来了威胁。因此,为了保障核电厂的安全运行,需要对敏感管的约束结构进行改造和优化。本文以国内某核电厂小支管为研究对象,通过现场实测与理论分析相结合的手段,获得了小支管的模态特性,结合现场实测数据,用谱分析的方法计算得到小支管在运行工况下的振动响应,计算结果表明,该小支管疲劳应力超过了疲劳许用交变应力,即该小支管为敏感管。通过本文的计算分析,不仅准确地判断出了敏感管,更为后续小支管的约束结构改造和优化提供了理论依据。
With the extension of operating life of nuclear power plants,the vibration fatigue of the small branch pipes becomes more and more prominent,which poses a threat to the safety and economic of nuclear power plants.Therefore,to ensure the safe operation of nuclear power plants,it is necessary to reconstruct the constraint of the sensitive pipes.In this paper,a branch pipe of a nuclear power plant was taken as the research object,and experimental and numerical studies were performed to obtain the modal characteristics of the pipe.Spectrum analysis was conducted to calculate the vibration response of the pipe in the operation condition.The calculation results showed that the fatigue stress of the branch pipe exceeds the allowable alternating stress of fatigue,that is,the branch pipe is a sensitive pipe.According to the numerical analysis,not only the sensitive pipe was accurately judged,but also the theoretical basis was provided for the reconstruction and optimization of the constrained structure of subsequent branch pipe.
作者
赖姜
何超
孙磊
李朋洲
Lai Jiang;He Chao;Sun Lei;Li Pengzhou(Nuclear Power Institute of China,Chengdu,610213,China)
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2019年第A01期114-116,共3页
Nuclear Power Engineering
关键词
核电厂
小支管
模态特性
振动响应
Nuclear power plants
Branch pipe
Modal characteristics
Dynamic response
