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http://dx.doi.org/10.5050/KSNVN.2005.15.2.192

Analysis of Damped Vibration Signal Using Empirical Mode Decomposition Method  

Lee, Injae (한국과학기술연구원 트라이볼로지연구센터)
Lee, Jong-Min (한국과학기술연구원 트라이볼로지연구센터)
Hwang, Yoha (한국과학기술연구원 트라이볼로지연구센터)
Huh, Kunsoo (한양대학교 기계공학부)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.15, no.2, 2005 , pp. 192-198 More about this Journal
Abstract
Empirical mode decomposition(EMD) method has been recently proposed to analyze non-linear and non-stationary data. This method allows the decomposition of one-dimensional signals into intrinsic mode functions(IMFs) and is used to calculate a meaningful multi-component instantaneous frequency. In this paper, it is assumed that each mode of damped vibration signal could be well separated in the form of IMF by EMD. In this case, we can have a new powerful method to calculate natural frequencies and dampings from damped vibration signal which usually has multiple modes. This proposed method has been verified by both simulation and experiment. The results by EMD method whichhas used only output vibration data are almost identical to the results by FRF method which has used both input and output data, thereby proving usefulness and accuracy of the proposed method.
Keywords
Empirical Mode Docomposition(EMD); Hilbert-huang Transform; Intrinsic Mode Function(IMF); Intrinsic Mode Function; Damping;
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