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Structural Reliability Sensitivity Analysis Method Based on Lamb Wave Defect Quantification

A technology of reliability and quantitative results, applied in the field of detection, can solve the problems of lack of quantification of the influence of local unit defects on the overall reliability of the structure, difficulty in establishing unit quantitative models, etc.

Active Publication Date: 2022-06-03
BEIHANG UNIV +1
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Problems solved by technology

[0003] Current research mainly focuses on the influence of unit defects on the reliability prediction results of the unit itself. It is difficult to establish a quantitative model between the unit defect size and the overall reliability of the structure. There is still a lack of corresponding quantification of the impact of local unit defects on the overall reliability of the structure. research methods

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  • Structural Reliability Sensitivity Analysis Method Based on Lamb Wave Defect Quantification
  • Structural Reliability Sensitivity Analysis Method Based on Lamb Wave Defect Quantification
  • Structural Reliability Sensitivity Analysis Method Based on Lamb Wave Defect Quantification

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[0083] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the related invention, but not to limit the invention. In addition, it should be noted that, for the convenience of description, only the parts related to the related invention are shown in the drawings.

[0084] It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0085] figure 1 Shown is a structural reliability sensitivity analysis method based on Lamb wave defect quantification of the present invention, and the method includes the following steps:

[0086] S1. Build a quantitative model of Lamb...

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Abstract

The invention provides a structural reliability sensitivity analysis method based on Lamb wave defect quantification. The method includes: using the Lamb wave damage detection signal to construct a Lamb wave defect quantitative model, and constructing a Lamb wave by means of the maximum likelihood method Defect quantitative uncertainty model, using the strain energy release rate theory to construct a unit defect size-performance parameter model, using the Paris formula to construct a unit fatigue crack growth model, and combining the finite element theory to construct an overall dynamic model of the structure with local defects. In order to predict the reliability, the sensitivity analysis method is used to quantify the influence of the quantitative uncertainty of local unit defects in the structure on the reliability of the structure. The invention quantifies the impact of the uncertainty distribution parameters of the parameters in the Lamb wave defect quantitative model and the fatigue crack growth model on the overall reliability of the structure, which is convenient for reducing the uncertainty of the reliability evaluation and life prediction results, and has a strong practicality.

Description

technical field [0001] The invention belongs to the technical field of detection, in particular to a structural reliability sensitivity analysis method based on Lamb wave defect quantification. Background technique [0002] Sensitivity analysis mainly analyzes the influence of the uncertainty of the input variables of the quantitative model on the output of the model, so that the uncertainty of each input variable can be optimized to reduce the uncertainty of the prediction results. During the service process of the structure, the elements in the structure will inevitably have accumulated damage due to fatigue, corrosion, aging and other reasons, which will easily lead to structural failure. Therefore, real-time monitoring of the damage in the structure and prediction of the reliability and remaining life of the structure according to the damage situation can avoid serious consequences caused by the failure of the structure. However, due to the uncertainty in the damage qua...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F17/18G06F119/02G06F119/04
CPCG06F30/23G06F17/18G06F2119/02G06F2119/04Y02T90/00
Inventor 何晶靖关雪飞栾超
Owner BEIHANG UNIV
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