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Phased array curved surface full-focusing imaging optimization method and system for sound field threshold segmentation

A technology of threshold segmentation and optimization method, which is applied in the analysis of solids by using sound wave/ultrasonic wave/infrasonic wave, material analysis and material analysis by using sound wave/ultrasonic wave/infrasonic wave. Participate in calculations, improve algorithm efficiency and imaging signal-to-noise ratio, and ensure the effect of defect imaging quality

Active Publication Date: 2021-11-23
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the present invention provides a phased array curved surface all-focus imaging optimization method based on sound field threshold segmentation, which can realize high-resolution and fast ultrasonic full-focus imaging of metal parts with different curvature convex / concave section geometry Imaging, to solve the serious problem of surface full-focus imaging noise, use the array element sound field simulation to determine the effective imaging area, improve the imaging quality and increase the imaging rate at the same time

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  • Phased array curved surface full-focusing imaging optimization method and system for sound field threshold segmentation
  • Phased array curved surface full-focusing imaging optimization method and system for sound field threshold segmentation
  • Phased array curved surface full-focusing imaging optimization method and system for sound field threshold segmentation

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Embodiment 1

[0043] Such as figure 1 As shown, the water immersion all-focus detection system of the embodiment of the present invention includes a water tank, a curved surface part to be tested, a linear ultrasonic phased array probe, an ultrasonic phased array detector and a computer, wherein ultrasonic detection software is installed in the computer. The ultrasonic testing software mainly implements the phased array curved surface all-focus imaging optimization method of sound field threshold segmentation.

[0044] The phased array curved surface all-focus imaging optimization method for sound field threshold segmentation in the embodiment of the present invention mainly includes the following steps:

[0045] Step (1): Determine the detection parameters such as probe frequency f, number of array elements N, array element width d, array element spacing p, and water layer height h according to the material of the curved surface part to be tested and the curvature of the curved surface;

[...

Embodiment 2

[0087] Such as Figure 4 As shown, the goal of this embodiment is the detection of the curved surface area of ​​the aero-engine air intake casing ring forging: the convex area R=15mm, and the transverse through hole defect with a diameter of 1.2mm is processed; the concave area R=20mm, respectively processed with a diameter of 0.5mm , 1.0mm and 1.5mm transverse through-hole defects, the material is titanium alloy TC2, the longitudinal wave sound velocity is 6163m / s, and the density is 4.55g / cm3 .

[0088] The ultrasonic all-focus detection and imaging optimization of the aero-engine casing ring forging in the embodiment of the present invention includes the following steps:

[0089] Step (1): The present invention adopts a linear phased array probe water immersion method to detect, the probe frequency is 10MHz, the number of probe array elements is N=64, the array element interval is p=0.3mm, and the distance between the center of the convex surface and the height of the probe...

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Abstract

The invention discloses a phased array curved surface full-focusing imaging optimization method for sound field threshold segmentation. The phased array curved surface full-focusing imaging optimization method comprises the following steps: determining detection parameters according to a curved surface part to be detected; immersing the to-be-detected curved surface part into water, detecting the convex surface and concave surface positions of the to-be-detected curved surface part, and collecting full-matrix data; dividing a to-be-measured area into a convex surface area and a concave surface area, and simulating each array element sound field in the double-medium curved surface; taking a certain proportion of the maximum value of the sound field intensity of each array element as a threshold value, carrying out threshold value segmentation on each array element imaging region, generating an effective region coefficient matrix, and obtaining a full-focus optimized image of the curved surface of the part; and analyzing the defect sizes and positions of the convex surface area and the concave surface area of the to-be-detected curved surface part. According to the method, the imaging quality is ensured, the full-focusing imaging rate is effectively improved, and the method has important industrial application value for water immersion ultrasonic full-focusing high-sensitivity detection and rapid imaging of complex parts.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic nondestructive testing, and in particular relates to a phased array curved surface all-focus imaging optimization method for sound field threshold segmentation, which is suitable for ultrasonic testing of metal parts with different curvature convex / concave geometric features. Background technique [0002] Ultrasonic phased array adopts multi-array element focusing imaging, which has better defect characterization ability and higher detection accuracy, and is widely used in aerospace, petrochemical, wind power nuclear energy and rail transportation and other fields. Especially for the non-destructive testing of curved surface components such as special-shaped rings of aviation casings, oil pipelines, and wind power bearing raceways, ultrasonic phased arrays have more advantages. At present, for complex curved surface components, ultrasonic phased array flexible probes or curved surface array pro...

Claims

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Application Information

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IPC IPC(8): G01N29/06G01N29/28G01N29/26G01N29/44
CPCG01N29/069G01N29/28G01N29/262G01N29/4427G01N29/4472G01N2291/0234G01N2291/0289G01N2291/106
Inventor 汪小凯关山月华林钱东升李一轩
Owner WUHAN UNIV OF TECH
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