Cross-correlation-based Lamb wave sensing signal length compensation method

A technology of sensing signal and length compensation, which is applied in the processing of detected response signals, analysis of solids using sonic/ultrasonic/infrasonic waves, and material analysis using sonic/ultrasonic/infrasonic waves, etc. It can solve damage identification and characterization errors, affecting signals Analysis results, limited data acquisition system storage space and other issues, to increase the sampling length, improve accuracy, and promote the effect of application

Inactive Publication Date: 2018-03-13
中国人民解放军空军勤务学院
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Problems solved by technology

[0003] However, limited by the storage space of the data acquisition system, the length of the Lamb wave sensing signal collected by the single-channel data acquisition system is limited, which seriously affects the subsequent signal analysis results, resulting in large damage identification and characterization errors

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  • Cross-correlation-based Lamb wave sensing signal length compensation method
  • Cross-correlation-based Lamb wave sensing signal length compensation method
  • Cross-correlation-based Lamb wave sensing signal length compensation method

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[0034] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0035] This method first arranges another compensation sensor near the original sensor, and the two sensors collect the Lamb wave signal synchronously; then calculates the cross-correlation function of the two Lamb wave sensing signals, and obtains the delay time; Compensate the sense signal length.

[0036] Such as figure 1 As shown, this method is to arrange another Lamb wave sensor B near the original Lamb wave sensor A; the two Lamb wave sensors A and B collect synchronously to obtain the Lamb wave sensing signal f A (t) and f B (t); two Lamb wave sensing signals f collected synchronously A (t) and f B (t) Carry out the cross-correlation operation to obtain the cross-correlation function R(n); according to the relative delay time t corresponding to the maximum point of the cross-correlation function R(n) N and f A (t) signal time length T, calculate f B (t...

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Abstract

The invention discloses a cross-correlation-based Lamb wave sensing signal length compensation method and belongs to the technical field of engineering structure health monitoring. The method comprises arranging a compensation sensor close to an original sensor, synchronously acquiring Lamb wave signals through the two sensors, calculating a cross-correlation function of the two Lamb wave sensingsignals, calculating delay time, intercepting the compensation signal, and carrying out compensation on the Lamb wave sensing signal length. The method reduces Lamb wave sensing signal requirements onthe storage space of the data acquisition system, increases the sampling length of the Lamb wave sensing signal, improves the accuracy of subsequent Lamb wave sensing signal processing and analysis and promotes the use of the Lamb wave-based structural health monitoring method in the field of engineering structure health monitoring.

Description

technical field [0001] The invention relates to the technical field of engineering structure health monitoring, in particular to a cross-correlation-based Lamb wave sensing signal length compensation method. Background technique [0002] Structural health monitoring technology has important scientific research significance and broad application prospects for preventing major accidents, improving structural safety, reducing economic losses, reducing structural maintenance costs, and ensuring the construction of major engineering projects. The structural health monitoring method based on Lamb waves has the advantages of high damage monitoring sensitivity, large monitoring range, online application and offline application, active damage monitoring and passive impact monitoring, and monitoring of metal structures and composite materials. structure and so on. Therefore, the structural health monitoring method based on Lamb waves has been widely studied at home and abroad, and it...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/44
CPCG01N29/041G01N29/50
Inventor 刘彬孟凡芹耿光辉宋生奎石永春王朝晖贾丽王文娟曹泽煜陈利安徐克明赵鹏程
Owner 中国人民解放军空军勤务学院
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