Ultrasonic Lamb wave local circulation scanning probability reconstruction tomography method

A technology of cyclic scanning and imaging method, which is applied in the direction of analyzing solids by using sound wave/ultrasonic wave/infrasonic wave, which can solve the problems that it is difficult to eliminate the influence of external interference and electromagnetic interference in the detection area, low detection resolution, and influence on fault detection results, etc.

Inactive Publication Date: 2015-07-08
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] The above method has the following defects: (1) It is difficult to eliminate the influence of external interference and electromagnetic interference in the detection area, which may easily cause misjudgment and missed judgment; (2) When there are multiple faults in the detection area, especially when the

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  • Ultrasonic Lamb wave local circulation scanning probability reconstruction tomography method
  • Ultrasonic Lamb wave local circulation scanning probability reconstruction tomography method
  • Ultrasonic Lamb wave local circulation scanning probability reconstruction tomography method

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Embodiment Construction

[0048] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0049] refer to figure 1 , a method for probabilistic reconstruction tomography of ultrasonic Lamb wave local circulation scanning, comprising the following steps:

[0050] 1) Sensor installation: plan the detection area, establish a coordinate system, divide the grid as the detection pixel point coordinates (x, y), arrange a clock-shaped sensor array on the component to be detected, and record the sensor position coordinates (x k ,y k );

[0051] 2) Select the Lamb wave mode and design the excitation signal: according to the type of damage, select the damage-sensitive mode, and calculate the maximum velocity and minimum speed;

[0052] 3) Acquisition of reference signals: In the structurally intact state, the center sensor is used as the excitation first, and the circumference sensor is used as the receiving end; then the sensors on the circumference are used as...

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Abstract

An ultrasonic Lamb wave local circulation scanning probability reconstruction tomography method includes following steps: (1) planning a detection zone and arranging a sensor array on a detection part; (2) selecting a Lamb wave modal and designing an excitation signal, and respectively collecting reference signals and damage signals relative to the sensor pairs; (3) dividing the detection zone to obtain a plurality of sectors, wherein several adjacent sectors are employed as a sub zone; (4) when detection in a sub zone is completed every time, clockwisely rotating the sub zone by a position of one sector to form a next cyclic detection sub zone; (5) performing data selection pre-processing, calculating an valid data length according to the distance among the sensor pairs and the modal speed of the selected Lamb wave; (6) performing local circulation probability reconstruction tomography calculation; and (7) finally performing data fusion and image splicing. The method is strong in anti-jamming capability, is high in precision, can effectively eliminate the influence of multiple faults and the like on the method, and can increase detection resolution rate in multi-fault damage.

Description

technical field [0001] The invention belongs to the field of mechanical structure health monitoring, and relates to an ultrasonic Lamb wave partial circular scanning probability reconstruction tomography method. Background technique [0002] Lamb wave is a kind of ultrasonic guided wave, which has the characteristics of high detection efficiency, weak attenuation, and sensitivity to damage in structures. It is regarded as the most potential damage detection method for plate and shell structures. In the implementation process, the sensor array is generally used to obtain the propagation signal of the Lamb wave in the structure, and the detection and evaluation of the damage can be realized by extracting the characteristic parameters sensitive to the fault. Probabilistic reconstruction tomography is an effective means of detecting structural damage. This method uses the signal difference between the reference signal and the real-time signal in the normal state as the characte...

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Application Information

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IPC IPC(8): G01N29/04
Inventor 林京曾亮高飞华佳东黄利平罗志
Owner XI AN JIAOTONG UNIV
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