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Structural damage early warning method based on empirical mode decomposition

An empirical mode decomposition and structural damage technology, applied in the field of structural damage identification, can solve the problem of low reliability of the results, achieve the effects of improving the accuracy of early warning, accurate and intuitive results, and improving processing accuracy

Active Publication Date: 2014-01-22
QINGDAO TECHNOLOGICAL UNIVERSITY
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Problems solved by technology

However, noise is unavoidable in actual operation, and noise will also cause sudden changes in the graph of the intrinsic mode function. Since there is no specific quantitative index, the judgment of the structural damage state is somewhat subjective, especially when the degree of structural damage is small, the result is reliable. Sex is not high

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  • Structural damage early warning method based on empirical mode decomposition
  • Structural damage early warning method based on empirical mode decomposition
  • Structural damage early warning method based on empirical mode decomposition

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[0026] A structural damage early warning method based on empirical mode decomposition, comprising the following steps:

[0027] Step 1: Obtain the acceleration response signals of some measuring points before and after the structural damage, and calculate the vibration transmissibility function by Fourier transform:

[0028] T ij ( ω ) = A i ( ω ) A j ( ω ) - - - ( 1 )

[0029] In the formula, A i（ω） , A j（ω） Respectively are the Fourier transform of the response signals at points a and b; ...

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Abstract

The invention relates to the field of structural damage recognition, in particular to a structural damage early warning method based on empirical mode decomposition. The method comprises the steps that a vibration transmissibility function is constructed by utilizing structural response; an amplitude value of the vibration transmissibility function serves as an analysis signal; a natural mode function is obtained by an empirical mode decomposition technology; a waveform index of the natural mode function is calculated by reference to a definition of a waveform index in a signal waveform processing technology; waveform indexes before and after structural damage are compared to judge whether a structure is damaged; and structural damage early warning is performed. The method is high in operability; the processing precision is improved; and the early warning accuracy is improved.

Description

technical field [0001] The invention relates to the field of structural damage identification, in particular to a structural damage early warning method based on empirical mode decomposition. Background technique [0002] Due to the effect of load and the influence of the environment, civil engineering structures will be damaged to varying degrees during service. If they are not detected and taken measures in time, it will bring catastrophic consequences. Therefore, it is necessary to carry out research on early warning of structural damage. At present, many structural damage early warning methods have been researched and proposed. Among them, the structural damage early warning method based on vibration response analysis is closer to the actual situation because it does not need to measure the excitation and only uses the structural response to evaluate the health status of the structure. A method with broad application prospects. [0003] At present, the structural respon...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M99/00
Inventor 刁延松任红陈家宝曹亚东孙玉婷华盼盼徐东锋
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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