A Novel Multidimensional Frequency Band Energy Ratio Analysis Method for the Pressure Fluctuation of Francis Turbine
Joint Authors
Chen, Qijuan
Wang, Weiyu
Liang, Xing
Yue, Xuhui
Dou, Jinzhou
Source
Mathematical Problems in Engineering
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-01-21
Country of Publication
Egypt
No. of Pages
10
Main Subjects
Abstract EN
The pressure fluctuation has multiple influence on the steady operation of Francis turbine, and the impact degree varies with the operation condition.
In this paper, for the analysis of pressure fluctuation in the Francis turbine, a novel feature extraction method of multidimensional frequency bands energy ratio is proposed based on Hilbert Huang Transform (HHT).
Firstly, the pressure fluctuation signal is decomposed into intrinsic mode functions (IMFs) by EEMD.
Secondly, the Hilbert marginal spectrum is utilized to analyze the frequency characteristics of IMFs.
Then, according to the inner frequency of IMFs, each of them is divided into high, medium, or low frequency band which are constructed based on the frequency characteristic of the pressure fluctuations in the Francis turbine.
Afterward, the energy ratio of each frequency band to the original signal is calculated, which is to realize the feature extraction of multidimensional frequency band energy ratio.
Actual applications verify that this method not only can extract the time-frequency characteristics but also can analyze the condition feature of the pressure fluctuation.
It is a novel method for extracting the feature of pressure fluctuation in the Francis turbine.
American Psychological Association (APA)
Wang, Weiyu& Chen, Qijuan& Liang, Xing& Yue, Xuhui& Dou, Jinzhou. 2018. A Novel Multidimensional Frequency Band Energy Ratio Analysis Method for the Pressure Fluctuation of Francis Turbine. Mathematical Problems in Engineering،Vol. 2018, no. 2018, pp.1-10.
https://search.emarefa.net/detail/BIM-1206857
Modern Language Association (MLA)
Wang, Weiyu…[et al.]. A Novel Multidimensional Frequency Band Energy Ratio Analysis Method for the Pressure Fluctuation of Francis Turbine. Mathematical Problems in Engineering No. 2018 (2018), pp.1-10.
https://search.emarefa.net/detail/BIM-1206857
American Medical Association (AMA)
Wang, Weiyu& Chen, Qijuan& Liang, Xing& Yue, Xuhui& Dou, Jinzhou. A Novel Multidimensional Frequency Band Energy Ratio Analysis Method for the Pressure Fluctuation of Francis Turbine. Mathematical Problems in Engineering. 2018. Vol. 2018, no. 2018, pp.1-10.
https://search.emarefa.net/detail/BIM-1206857
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1206857