Negative Ten Decibels Method for Damping Identification of Light Damping Structure

Negative Ten Decibels Method for Damping Identification of Light Damping Structure

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 decibel...

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Veröffentlicht in:Applied Mechanics and Materials 2014-07, Vol.577 (Applied Decisions in Area of Mechanical Engineering and Industrial Manufacturing), p.170-173
Hauptverfasser: Sheng, Mei Ping, Guo, Zhi Wei, Ma, Jian Gang
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Sprache:eng
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Algorithms
Bandwidth
Computer simulation
Damping
Decibels
Errors
Noise
Test procedures
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container_issue Applied Decisions in Area of Mechanical Engineering and Industrial Manufacturing
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container_title Applied Mechanics and Materials
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creator Sheng, Mei Ping
Guo, Zhi Wei
Ma, Jian Gang
description 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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subjects Algorithms
Bandwidth
Computer simulation
Damping
Decibels
Errors
Noise
Test procedures
title Negative Ten Decibels Method for Damping Identification of Light Damping Structure
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