경험 모드 분석법을 이용한 감쇠 진동 신호의 분석

Analysis of Damped Vibration Signal using Empirical Mode Decomposition Method

  • 이인재 (한국과학기술연구원 트라이볼로지연구센터) ;
  • 이종민 (한국과학기술연구원 트라이볼로지연구센터) ;
  • 황요하 (한국과학기술연구원 트라이볼로지연구센터) ;
  • 허건수 (한양대학교 기계공학부)
  • 발행 : 2004.11.01

초록

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 result by EMD method which has used only output vibration data is almost identical to the result by FRF method which has used both input and output data, thereby proving usefulness and accuracy of the proposed method.

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