Structural damage identification method based on step-by-step deletion model

A technology for structural damage and identification methods, which is applied in complex mathematical operations, geometric CAD, sustainable transportation, etc. It can solve the problem of unclear damage location judgment, and achieve the effects of automatic data processing, wide application range and strong robustness.

Active Publication Date: 2020-04-24
HOHAI UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to provide a structural damage identification method based on a step-by-step deletion model to solve the defects in the prior art that cause noise and measurement error causes unclear damage location judgment

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  • Structural damage identification method based on step-by-step deletion model
  • Structural damage identification method based on step-by-step deletion model
  • Structural damage identification method based on step-by-step deletion model

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Embodiment Construction

[0061] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0062] In a statistical sense, damage identification is essentially to find outliers whose structural unit behavior is different from the overall law. In actual engineering, the damage area is local and small-scale to the overall structure, so the characteristics of the observation data in the non-damage area are dominant and dominant in the overall observation data, while the characteristics of the observation data in the damage area are different from those in the non-damage area. The characteristics of the observation data in the damage observation area, so finding outliers that are inconsistent with the overall data is the mathematical essence of structural damage identification. According to the curve characteristics of the curvature mode dif...

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Abstract

The invention discloses a structural damage identification method based on a step-by-step deletion model. The method comprises the following steps of obtaining a curvature modal difference between a current state and an intact state of a structure; establishing a curvature modal difference polynomial regression model; carrying out matrix processing on the regression model, and carrying out parameter estimation; deleting the curvature modal difference of a certain node, re-establishing a polynomial regression model and carrying out matrix processing, and carrying out parameter estimation; analyzing the difference of regression coefficients before and after node deletion by using MWK statistics, and searching a node set which is judged to be possibly damaged; wherein the node with the maximum MWK statistical magnitude absolute value in the possible damage node set is judged as a damage node; and deleting residual sample data of the node with the maximum MWK statistic absolute value in the damage set, and repeating the steps until all damage points are found out. According to the method provided by the invention, the parameter extraction process is suitable for a single-damage or multi-damage condition, and the technical problem of unclear damage position judgment caused by noise and measurement errors in existing power damage identification can be solved.

Description

technical field [0001] The invention relates to the technical field of engineering detection, in particular to a structural damage identification method based on a step-by-step deletion model. Background technique: [0002] The damage research method based on dynamic fingerprints comprehensively uses interdisciplinary technologies such as structural vibration theory, vibration testing technology and data processing technology, and is considered to be the most promising structural nondestructive testing method at present. In the damage diagnosis method of dynamic fingerprint, the curvature mode shows high sensitivity to local damage, which has become a research hotspot in the field of structural engineering. However, the sensitivity of the curvature mode is high, and it is easily affected by random errors and measurement errors, which makes the index less robust. Contents of the invention [0003] The purpose of the present invention is to provide a structural damage ident...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/13G06F17/18
CPCG06F17/18Y02T90/00
Inventor 朱瑞虎王启明郑金海王宁罗孟岩车宇飞郭健王军磊曾海坤
Owner HOHAI UNIV
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