Signal compensation method based on polynomial fitting and linear piezoelectric sensor array

A piezoelectric sensor and polynomial fitting technology, applied in the detection of response signals, instruments, scientific instruments, etc., can solve problems such as damage identification and characterization errors, affecting signal analysis results, and limited storage space in data acquisition systems. Increase the sampling length, improve the accuracy, and promote the effect of the application

Inactive Publication Date: 2018-02-23
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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  • Signal compensation method based on polynomial fitting and linear piezoelectric sensor array
  • Signal compensation method based on polynomial fitting and linear piezoelectric sensor array
  • Signal compensation method based on polynomial fitting and linear piezoelectric sensor array

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Embodiment Construction

[0042] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0043]In this method, a linear piezoelectric sensor array is first arranged near the original sensor, and the Lamb wave signal is collected synchronously; then, the compensation signal is selected from the nearest one to the original sensor in sequence; the signal to be compensated and the compensation signal are first timed Delay and then synthesize; perform polynomial fitting on the synthesized signal; use the fitting formula to calculate the synthesized error between the time-delayed signal to be compensated and the compensated signal; finally select the synthesized signal corresponding to the minimum value point of the synthesized error as the best synthesized signal to realize Compensation for Lamb wave sensing signals.

[0044] Such as figure 1 As shown, a linear piezoelectric sensor array is arranged near the original sensor, and the Lamb wave signal is colle...

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Abstract

The invention discloses a signal compensation method based on a polynomial fitting and a linear piezoelectric sensor array, belonging to the technical field of engineering structure health monitoring.The method comprises the following steps: arranging a linear piezoelectric sensor array nearby an original sensor, and synchronously acquiring a Lamb wave signal; sequentially selecting compensationsignals from the near to the distant from one signal closest to the original sensor; performing time delay on to-be-compensated signals and the compensation signals, and synthesizing the signals; performing polynomial fitting on the synthesized signals; calculating composite errors of the to-be-compensated signals and the compensation signals after time delay by using a fitting formula; and finally, selecting a synthesized signal corresponding to the minimum composite error as an optimal synthesized signal, thereby realizing compensation of the Lamb wave sensing signal. According to the methoddisclosed by the invention, the requirement of Lamb wave sensing signal acquisition on a storage space of a data acquisition system is lowered, the sampling length of the Lamb wave sensing signal isincreased, and the subsequent Lamb wave sensing signal processing and analyzing accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of engineering structure health monitoring, in particular to a signal compensation method based on polynomial fitting and a linear piezoelectric sensor array. 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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/36G01N29/24
CPCG01N29/041G01N29/245G01N29/2468G01N29/36G01N2291/023G01N2291/0289G01N2291/0427
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校云鹏
Owner 中国人民解放军空军勤务学院
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