Study on decay method for structure vibration damping test

Yin Bang-hui;Wang Min-qing;Wu Xiao-dong

Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (4) : 100-106.

PDF(1307 KB)
PDF(1307 KB)
Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (4) : 100-106.
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Study on decay method for structure vibration damping test

  • Yin Bang-hui, Wang Min-qing,Wu Xiao-dong
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Abstract

The technologies of reverse filtering, backward integral and energy level average are used to build the damping test data processing system for decay method; the relationship between the decay method test results and frequency-band damping in the sense of statistical energy analysis and the effect of modes outside the frequency band on damping test results are studied; in the end of this paper, a plate’s transient impact response data from finite element simulation are used to verify the relevant conclusions. The main conclusions include: if the difference of the modal damping of the modes in the frequency-band is small, the decay method results are close to frequency-band damping in the sense of statistical energy analysis while on the contrary the decay method results are less than frequency-band damping in the sense of statistical energy analysis; if there are modes with small damping outside the considered frequency-band, the damping test results will be strongly influenced by the mode; if the damping of each mode gently changes with frequency, the decay method test results are accurate, while on the contrary a large error will be caused.



Key words

Decay method / damping test / frequency-band averaged damping loss factor / statistical energy analysis

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Yin Bang-hui;Wang Min-qing;Wu Xiao-dong. Study on decay method for structure vibration damping test[J]. Journal of Vibration and Shock, 2014, 33(4): 100-106
PDF(1307 KB)

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