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요약정보
汽轮机阀门关闭试验中的噪声分析和信号处理 / Noise Analysis and Signal Processing in the Turbine Valve Closing Test
Resource Type
Academic Journal
Authors
梅益铭
;
顾伟飞
;
祝相云
;
朱宝
;
MEI Yiming
;
GU Weifei
;
ZHU Xiangyun
;
ZHU Bao
Source
中国电力 / Electric Power
. 52(9):154-160
Subject
汽轮机
汽阀关闭时间
噪声污染
FFT
波形比较
IIR数字滤波
Language
Chinese
ISSN
1004-9649
Online Access
Find it @ DONGA
초록
在进行汽轮机汽阀关闭试验时,可能会发生阀位信号受噪声污染的现象,从而无法计算准确的关闭时间,严重影响汽轮机安全评估的可靠性.针对某电厂汽阀关闭试验中被污染的信号,采用快速傅立叶变换(fast Fourie transform,FFT)对信号的构成进行了分析,采用波形比较的方法对单一正弦分量污染下的关闭时间进行了计算;采用无限脉冲响应(infinite impulse response,IIR)数字滤波法对多频率正弦噪声分量影响下的信号进行了滤波,比较了不同滤波器的滤波效果并对滤波后的关闭时间进行了计算.结果表明,波形比较法可用于单一分量污染下的关闭时间计算,巴特沃斯(Butterworth)滤波器和切比雪夫(Chebyshev)Ⅰ型滤波器可用于多频率正弦噪声分量影响下的信号滤波,基于巴特沃斯滤波的汽阀关闭时间计算结果略优于切比雪夫Ⅰ型.
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