基于EMD的核电站小支管振动研究  

Vibration Research on Little Branch of Nuclear Power Station Based on EMD

作　　者：徐浩[1] 符向前[1] 贾梧桐 陈英强[1] 

机构地区：[1]武汉大学动力与机械学院,武汉430072

出　　处：《科学技术与工程》2016年第10期135-139,共5页Science Technology and Engineering

基　　金：国家自然科学基金项目(51179135)资助

摘　　要：小支管振动是核电站管道系统的常见现象。根据国内外核电站运行经验,在剧烈振动下小支管与母管连接处的焊缝容易疲劳失效,导致输送介质泄露。由于小支管振动原因的复杂性,使得这类问题的解决非常困难。基于经验模态分解方法(EMD),以大亚湾核电站汽动给水泵系统一支管振动为例,将振动响应原始信号分解成若干个固有模式分量(IMF),选取与原始信号相关度高的分量进行信息重构,确定支管振动主频率。从测点振动信号幅频图可知,支管主振频率为145 Hz左右。结合CAESARII软件所计算的支管各阶固有频率结果,从而找出引起支管振动的原因。结果表明EMD方法能有效应用于核电站小支管振动分析。Little branch vibration of nuclear power station is a common phenomenon for pipe system,according to operating experience about domestic and foreign nuclear power station,it＇s prone to form fatigue failure on the weld joint between little branch and common header in intense vibration,thus increasing the leak risk of flow media.Basing on empirical mode decomposition（ EMD） and taking a little branch of daya bay nuclear power station steam feed pump system as an example,original vibration signals were divided into several Intrinsic Mode functions（ IMF）,selected components highly relevant to original signals and reconstructed them so as to eliminate irrelevant interfering signals and confirm the main vibration frequency of the branch.According to amplitude frequency diagrams of vibration signals,the main vibration frequency is about 145 Hz.Combining it with inherent frequencies of the branch by CAEARII,the vibration reason of the branch had been conformed.The result indicates that it plays an important role for the use of EMD to little branch vibration of nuclear power station.

关 键 词：小支管 振动 频率 EMD方法 

分 类 号：TH165.3[机械工程—机械制造及自动化]