Modes in operational analysis

ZHANG Yi-min;ZHANG Shou-yuan;LI He;WEN Bang-chun

Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (1) : 64-67.

PDF(1021 KB)
PDF(1021 KB)
Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (1) : 64-67.
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Modes in operational analysis

  • ZHANG Yi-min,ZHANG Shou-yuan,LI He,WEN Bang-chun
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Abstract

Abstract:There are lots of rotating machines in mechanical engineering field,which make input excitations don't meet the requirement of operational modal analysis(OMA).A simple and effective method of distinguishing the forced harmonic resonse from the measured vibration signal was presented through analysis of atatistical properties of stochastic signal and harmonic signal.This made OMA applicable to the situation existing harmonic excitation.An OMA and an experimental modal andlysis of a steel plate excited by a motor were carried out the harmonic components were succcessfully separated from the overall response with the proposed method.The comparison of the two experiment results proved the effectiveness of this method which provides a new way to distinguish the pseudo modes in an OMA.

Key words

operational modal analysis(OMA) / experimental modal analysis / harmonic mode

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ZHANG Yi-min;ZHANG Shou-yuan;LI He;WEN Bang-chun. Modes in operational analysis[J]. Journal of Vibration and Shock, 2009, 28(1): 64-67
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