摘要
为研究主进水阀的自激振动机理,首先基于瞬变流理论建立抽水蓄能电站过水系统精细化数值模型,计算得到上游测压管水位随时间的变化曲线。然后采用经验小波变换法(EWT)对电站采集的主进水阀自激振动信号和数值仿真信号进行特征提取和频谱分析,以验证数值模型的正确性。接着引入修正Morris参数筛选法,从众多性能参量中探明管道长度、管道的水击波速和主进水阀阀门间隙为敏感参量。最后,针对敏感参量设置3个方案分别进行数值模拟,以研究其对自激振动过程的具体影响。结果表明:主进水阀阀门间隙对自激振动的振幅增长速率及幅值影响大,但对系统的周期影响小;管道的水击波速及长度对自激振动的振幅增长速率、幅值以及周期影响极大。
In order to study self-excited vibration mechanism of the main inlet valve of a pumped storage power station,its waterflowing system’sprecision numerical simulation model was established based on the transient flow theory to obtain the variation curve of water level of the upstream pressure measuring pipe with time by calculation.The empirical wavelet transform(EWT)method was used to do feature extraction and spectral analysisfor self-excited vibration signals and simulatedonesof the main inlet valve,and verify the correctness of the numerical model.The modified Morris method was introduced to find pipeline length,pipelinewater hammer wave velocity and valve clearance of main inlet valve being sensitive parameters invarious performance ones.Finally,aiming at sensitive parameters,3 schemes were set to do numerical simulation,respectively and study their specific effects on self-excited vibration process.The results showedthat main inlet valve clearance has a large influence on self-excited vibration amplitude and its growth rate,but has little effect on system’s period;pipeline water hammer wave velocity and pipeline length have great influence on self-excited vibration amplitude,its growth rate and system’s period.
作者
李红辉
周建中
张勇传
许颜贺
田弟巍
王齐飞
LI Honghui;ZHOU Jianzhong;ZHANG Yongchuan;XU Yanhe;TIAN Diwei;WANG Qifei(College of Hydropower and Information Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2019年第19期52-57,76,共7页
Journal of Vibration and Shock
基金
国家重点研发计划(2016YFC0402205)
国家重点研发计划(2016YFC0401910)
国家自然科学基金青年科学基金项目(51809099)
关键词
主进水阀
自激振动
瞬变流理论
经验小波变换
修正Morris
maininlet valve
self-excited vibration
transient flow theory
empirical wavelet transform(EWT)method
modified Morris method