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Ultrasonic scattering coefficient optimal computation method for crack direction recognition

A crack, computer technology, applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze solids and process the response signals of detection, which can solve problems such as increasing the amount of calculation and increasing the complexity of analysis problems.

Active Publication Date: 2015-01-14
BEIJING UNIV OF TECH
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Problems solved by technology

In actual problem analysis, too many indicators will increase the amount of calculation and increase the complexity of the analysis problem

Method used

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  • Ultrasonic scattering coefficient optimal computation method for crack direction recognition
  • Ultrasonic scattering coefficient optimal computation method for crack direction recognition
  • Ultrasonic scattering coefficient optimal computation method for crack direction recognition

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Embodiment Construction

[0046] The validity of the method of the present invention will be described in detail below using the data obtained from CIVA simulation and detection experiments.

[0047] Using the ultrasonic simulation module in CIVA software, the ultrasonic phased array defect detection is simulated. In CIVA software, a simulation model containing crack defects at an angle of 15° to the horizontal direction is established, such as Figure 4 shown. Wherein, the base material is aluminum, and the crack length is 3 mm. The center frequency of the excitation signal is 5MHz, the sampling frequency is 100MHz, the phased array detection mode is the full matrix data acquisition mode, and the basic parameter settings of the probe are shown in Table 1.

[0048] Table 1 Basic parameters of the probe

[0049] Table1Basic parameters of the probe

[0050]

[0051] Step 1: Collect full matrix data of crack defects

[0052] Export the full matrix data of the detected crack defects from CIVA softw...

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Abstract

The invention relates to an ultrasonic scattering coefficient optimal computation method for crack direction recognition, belonging to the field of nondestructive examination. According to the method, an ultrasonic phased array detection system is used for acquiring full-matrix data of a crack defect; firstly, the acquired data are used for performing full-focusing imaging on the defect to determine the position of the defect and then a scattering coefficient space distribution of the crack defect is computed to determine an angle of the crack; the quantity of wafers included in a sub array and the quantity of wafers between adjacent sub arrays greatly affect the measurement precision of the crack angle. A plurality of evaluation indexes are used for evaluating the quantity of a crack angle measurement result according to the quantities of the wafers included in different sub arrays and the wafers between the adjacent sub arrays, and the measurement result is comprehensively evaluated by a main component analysis method to obtain an optimal measurement result; corresponding parameters, namely the quantities of the wafers included in the sub arrays and the quantity of the wafers between the adjacent sub arrays, are optimal detection parameters.

Description

technical field [0001] The invention belongs to the field of non-destructive testing, and in particular relates to an optimization calculation method for ultrasonic scattering coefficients, which is used for identifying the direction of crack defects. Background technique [0002] During long-term service, the structure is subject to environmental factors such as fatigue load, impact, corrosion, and high temperature, and is prone to various defects. Cracks are one of the most common and most harmful types of defects, and are considered to be the root cause of structural failure. At the same time, cracks have obvious directionality, and cracks in different directions have different degrees of damage to the structure. When the direction of the crack is perpendicular to the bearing capacity of the structure, the damage of the crack is the greatest, and the structure is prone to sudden fracture. Therefore, timely detection and direction identification of crack defects in the s...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/44
Inventor 焦敬品马婷何存富吴斌
Owner BEIJING UNIV OF TECH
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