Negative Ten Decibels Method for Damping Identification of Light Damping Structure

Zhi Wei Guo; Mei Ping Sheng; Jian Gang Ma

doi:10.4028/www.scientific.net/AMM.577.170

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 577Negative Ten Decibels Method for Damping...

Negative Ten Decibels Method for Damping Identification of Light Damping Structure

Abstract:

Half power method is commonly used in structural damping identification because of its simplicity in algorithm. But when the damping is very small, half power method will lead a big error. In order to get more accurate result of small damping structure, this paper suggests using negative ten decibels method (N-10dB) instead of half power method. N-10dB method takes 10-dB bandwidth into consideration, differs from 3-dB of half-power method. The theory of this method is given firstly and proves that it is very simple in algorithm. Subsequent simulation and experiment show that, compared with half power method, N-10dB method have stronger noise resistance, higer precision and is more stable in repeated measurements. Except that, the N-10dB method is also practical in engineering test.

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Periodical:

Applied Mechanics and Materials (Volume 577)

Pages:

170-173

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.577.170

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Online since:

July 2014

Authors:

Zhi Wei Guo*, Mei Ping Sheng, Jian Gang Ma

Keywords:

Damping Identification, Light Damping, Loss Factor, Negative Ten Decibels Method

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