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.
Study on decay method for structure vibration damping test
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.
Decay method / damping test / frequency-band averaged damping loss factor / statistical energy analysis {{custom_keyword}} /
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