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Phased array structure health monitoring Lamb wave compression and reconfiguration method

A technology of health monitoring and phased array, which is applied in the processing of detection response signals, the generation of ultrasonic/sonic/infrasonic waves, and the use of sound waves/ultrasonic/infrasonic waves to analyze solids, etc., which can solve the problems of long experiment time, large amount of collected signal data, Issues such as high signal processing and storage pressure in the later stage achieve the effect of low equipment requirements

Inactive Publication Date: 2015-03-04
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

However, in the process of phased array structural health monitoring, the sensor array contains a large number of sensors, and when sampling according to the traditional Nyquist sampling theorem, the data length of each Lamb wave response signal collected is relatively long
Due to the large amount of collected signal data, it leads to problems such as long experiment time, high signal processing and storage pressure in the later stage

Method used

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  • Phased array structure health monitoring Lamb wave compression and reconfiguration method
  • Phased array structure health monitoring Lamb wave compression and reconfiguration method
  • Phased array structure health monitoring Lamb wave compression and reconfiguration method

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Embodiment Construction

[0026] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] Concrete steps of the present invention have been described in the summary of the invention, as figure 1 shown.

[0028] In this embodiment, the structural object to be monitored is LF-21M antirust aluminum plate, figure 2 The size of the LF-21M anti-rust aluminum plate and the layout of the piezoelectric array are given. The structural size of the aluminum plate test piece is 1200mm×2000mm×1.5mm, and 8 piezoelectric sheets (labeled 0, 1, 2 , 3, 4, 5, 6, 7) to form a piezoelectric array, the piezoelectric sheet adopts PZT piezoelectric sheet, the diameter of the piezoelectric sheet is 8mm, the thickness is 0.48mm, the distance between the centers of two adjacent piezoelectric sheets is 12mm. The distance from the coordinate origin of the phased array to the left edge of the LF-21M antirust aluminum plate is 759mm, and the distanc...

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Abstract

The invention discloses a phased array structure health monitoring Lamb wave compression and reconfiguration method. The method comprises the steps of establishing a piezoelectric line array, directionally exciting and receiving a Lamb wave signal according to a phased array principle, carrying out sparse representation on an acquired Lamb wave response signal, projecting and transforming the signal by selecting a measuring matrix, establishing a reconfiguration algorithm so as to precisely restore the Lamb wave response signal, and comparing the restored Lamb wave response signal with an original signal. Based on the compression sensing principle, the data transmission amount is reduced, the efficacy of a sensor array is improved, and the precise reconfiguration of the Lamb wave signal acquired a phased array sensor array in a low sampling rate can be realized.

Description

technical field [0001] The invention belongs to the technical field of intelligent structure health monitoring, and in particular relates to a Lamb wave compression and reconstruction method for phased array structure health monitoring. Background technique [0002] Intelligent structural health monitoring technology uses sensor technology and advanced digital signal processing methods to monitor the status and faults of intelligent structures online in real time at the early stage of structural damage, timely and accurately identify damage in structures, ensure the safe operation of engineering systems, and reduce or avoid catastrophic accidents. is of great significance. Phased array structural health monitoring controls the monitoring direction of the Lamb wave beam by controlling the time delay between the transmission and reception of each sensor in the sensor array, so as to realize the directional scanning of the structure and identify the damage in the complex struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/34G01N29/44
Inventor 孙亚杰姜剑张永宏季赛
Owner NANJING UNIV OF INFORMATION SCI & TECH
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