Analysis of hydropower unit vibration signals based on variational mode decomposition

被引：21
作者：
An, Xueli [1 ]
Pan, Luoping [1 ]
Zhang, Fei [1 ]
机构：
[1] China Inst Water Resources & Hydropower Res, Beijing 100038, Peoples R China
来源：
JOURNAL OF VIBRATION AND CONTROL | 2017年 / 23卷 / 12期
基金：
中国国家自然科学基金;
关键词：
Hydropower unit; vibration; nonstationary signal; variational mode decomposition; mode mixing; FAULT-DETECTION;
D O I：
10.1177/1077546315605240
中图分类号：
O42 [声学];
学科分类号：
070206 ; 082403 ;
摘要：
The vibration signals of hydropower units are nonstationary when serious vortex occurs in the draft tube of the hydraulic turbine. The traditional signal analysis method based on Fourier transform is not suitable for the nonstationary signals. In the face of the nonstationarity of such signals and the limitation of the empirical mode decomposition method, a new nonstationary and nonlinear signal analyzing method based on variational mode decomposition (VMD) is introduced into hydropower unit vibration signals analysis. Firstly, VMD is used to decompose the signal into an ensemble of band-limited intrinsic mode functions components. Then, frequency spectrum analysis of these components is conducted to obtain the characteristic frequencies of the signal caused by the serious vortex of hydraulic turbine. Analysis of real test data shows that this proposed method can effectively suppress mode mixing. It can realize accurate analysis of nonstationary vibration signals. This provides a new way for analyzing hydropower unit vibration signals.
引用
收藏
页码：1938 / 1953
页数：16
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