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CN-121978213-A - Dual-mode focusing-based power transmission hardware crimping zone ultrasonic sensor control method, system, storage medium and equipment

CN121978213ACN 121978213 ACN121978213 ACN 121978213ACN-121978213-A

Abstract

The invention discloses a method, a system, a storage medium and equipment for controlling an ultrasonic sensor in a crimping area of a power transmission fitting based on dual-mode focusing, and relates to the technical field of ultrasonic detection of the power compression fitting, comprising the following steps of S1 system initialization, configuration of pulse width parameters of two scans; the method comprises the steps of S2, performing first wave scanning, S3, performing second wave scanning, S4, data acquisition, S5, fusion processing, S5, wherein the first wave scanning is performed by controlling a central core array element group to emit first long pulses, the peripheral edge array element group to emit first short pulses to form a central depth focusing sound field, the second wave scanning is performed by controlling the central core array element group to emit second short pulses, the peripheral edge array element group to emit second long pulses to form an edge high-resolution focusing sound field, the S4 data acquisition is performed by synchronously acquiring and storing full-matrix echo data of two waves, and the S5 fusion processing is performed by carrying out fusion processing on the full-matrix data of the two waves to reconstruct a three-dimensional acoustic image inside the compression fitting and carrying out automatic identification and positioning of defects.

Inventors

  • HAN YU
  • LIN HUA
  • LI PENG
  • ZHUANG YUAN
  • YIN HONGTAO
  • KONG XIANGHUAN

Assignees

  • 徐州华电电力勘察设计有限公司检测分公司
  • 国网江苏省电力有限公司徐州供电分公司

Dates

Publication Date
20260505
Application Date
20251231

Claims (15)

  1. 1. The utility model provides a transmission of electricity gold utensil crimping district ultrasonic sensor control method based on dual mode focus which characterized in that includes: S1, initializing a system, namely configuring pulse width parameters of two scans; s2, performing first wave scanning, namely controlling a central core array element group to emit first long pulses, and simultaneously controlling a peripheral edge array element group to emit first short pulses to form a central depth focusing sound field; S3, executing second wave scanning, namely controlling a core array element group of a center to emit second short pulses and simultaneously controlling a peripheral edge array element group to emit second long pulses to form an edge high-resolution focusing sound field; S4, data acquisition, namely synchronously acquiring and storing full matrix echo data of two wave times; s5, fusion processing is carried out on the full matrix data of the two wave times, a three-dimensional acoustic image inside the compression fitting is rebuilt, and automatic identification and positioning of defects are carried out.
  2. 2. The method for controlling the ultrasonic sensor in the crimping region of the power transmission hardware based on the dual-mode focusing according to claim 1 is characterized in that: s2, executing first wave scanning, which is specifically as follows: the controller sends a first excitation time sequence instruction to all the transmitting modules in the ultrasonic array module; controlling 13 core modules positioned in a central array element group of a central area of the array to emit ultrasonic pulses lasting 15 ms; simultaneously controlling the array element group at the peripheral edge to emit ultrasonic pulses lasting for 3 ms; and focusing and deeply focusing the energy of the sound beam to the inner central area of the crimping fitting.
  3. 3. The method for controlling the ultrasonic sensor in the crimping region of the power transmission hardware based on the dual-mode focusing according to claim 2 is characterized in that: S2, after the first wave scanning is finished, S3 is carried out to execute a second wave scanning, and the method is specifically as follows: The controller sends a second excitation time sequence instruction to the ultrasonic array module; controlling 13 core modules positioned in a central array element group of a central area of the array to emit ultrasonic pulses lasting for 3 ms; simultaneously controlling the array element group at the peripheral edge to emit ultrasonic pulses lasting 15 ms; deflection and focusing of the acoustic beam energy to the inner edge and near-surface region of the crimp fitting.
  4. 4. The method for controlling the ultrasonic sensor in the crimping region of the power transmission hardware based on dual-mode focusing according to claim 3, wherein the method comprises the following steps: s4, data acquisition, namely, the following steps: the ultrasonic array module receives a reflected echo from the inside of the hardware fitting; the controller records and stores the complete scan signal data sets of S2 and S3, respectively.
  5. 5. The method for controlling the ultrasonic sensor in the crimping region of the power transmission hardware based on the dual-mode focusing, which is disclosed in claim 4, is characterized in that: s5, fusion processing, namely carrying out fusion imaging and defect identification on the detection data acquired and stored in the S4, wherein the fusion imaging and defect identification are specifically as follows: carrying out data layer fusion on the depth data of the central area acquired in the step S2 and the high-resolution data of the edge area acquired in the step S3; Constructing a three-dimensional acoustic image inside the crimping fitting; and automatically identifying and positioning the defects based on the image features.
  6. 6. The method for controlling the ultrasonic sensor in the crimping region of the power transmission hardware based on the dual-mode focusing, which is disclosed in claim 5, is characterized in that: And S2, fusing the depth data of the central region acquired by the step S2 with the high-resolution data layer of the edge region acquired by the step S3, adopting a weighted superposition algorithm, distributing proper weights for different data sets according to the signal-to-noise ratio and the source of the signals, and synthesizing a three-dimensional acoustic image for displaying a deep structure and accurately representing the edge defect.
  7. 7. The method for controlling the ultrasonic sensor in the crimping region of the power transmission hardware based on the dual-mode focusing, which is characterized by comprising the following steps of: the weighted overlap algorithm is specifically as follows: two-channel image reconstruction, namely respectively carrying out three-dimensional imaging processing on the full matrix data acquired by the first wave time and the second wave time to generate a central depth focusing three-dimensional image Ic and an edge high-resolution focusing three-dimensional image Ie; calculating pixel-level self-adaptive weights, namely calculating corresponding fusion weights Wc (x, y, z) and We (x, y, z) according to signal characteristics of each point P (x, y, z) in the image space at the point on the basis of the first wave time and the second wave time respectively, wherein the signal characteristics at least comprise local signal-to-noise ratio and spatial position information of the point; The weight is calculated by respectively extracting signal segments Sc (t) and Se (t) of points P in the original A scanning signals corresponding to Ic and Ie, and the formula for calculating the signal energy is as follows: , And calculating the weight ratio: According to the weight ratio, calculating the proportion of the primary wave and the secondary wave, counting Wc (x, y, z) and We (x, y, z), and then carrying out weight calculation according to the following formula: 。
  8. 8. The method for controlling the ultrasonic sensor in the crimping region of the power transmission hardware based on the dual-mode focusing, which is characterized by comprising the following steps of: The synthesis of three-dimensional acoustic images showing deep structures and precisely characterizing edge defects is specifically as follows: The synthesis algorithm is that the amplitude I (P) of any pixel point P (x, y, z) in the three-dimensional acoustic image is synthesized by the following formula: Wherein N is the total array element number of the ultrasonic array, s ij (t) is the A scanning time domain signal recorded when an array element i is transmitted and an array element j is received, d i is the space geometric distance from a pixel point P to the transmitting array element i, d j is the space geometric distance from the pixel point P to the receiving array element j, v is the sound velocity of ultrasonic waves in the tested hardware fitting material, (d i + d j )/v is the total propagation time required by the sound waves from the transmitting array element i to the point P and then reflected back to the receiving array element j, and I is the envelope of a signal, obtained through Hilbert transformation, so that the amplitude information of an image is obtained instead of the oscillating radio frequency signal; The amplitude information of each point is fused to form a composite three-dimensional acoustic image.
  9. 9. The method for controlling the ultrasonic sensor in the crimping region of the power transmission hardware based on the dual-mode focusing, which is disclosed in claim 5, is characterized in that: the automatic identification and positioning of the defects based on the image features are specifically as follows: image preprocessing and noise suppression, namely, suppressing background noise on the fused three-dimensional acoustic image data by adopting an adaptive filtering algorithm, and simultaneously keeping the definition of the defect edge; Contrast enhancement, namely enhancing the contrast of weak reflection signal microcracks and the background in the image by applying a histogram equalization algorithm; dividing a defect area, namely dividing a pixel area suspected to be defective in an image from a background material by adopting a threshold dividing algorithm, wherein the formula is as follows: Where μ (x, y, z) is the arithmetic average of the gray values of all pixels within the local window. C is a constant offset, is a positive value, is set to 5 to 15 gray levels and is used for controlling the split sensitivity, and the larger the C value is, the fewer the split areas are; feature extraction, namely calculating a group of quantified morphological and acoustic feature vectors for each divided suspected defect area; Three-dimensional space positioning, namely calculating three-dimensional centroid coordinates (X, Y, Z) of each identified defect based on a coordinate system of a three-dimensional acoustic image, determining a space boundary frame of the three-dimensional centroid coordinates, and mapping the coordinates back to an actual physical coordinate system of the hardware fitting to realize millimeter-level accurate positioning of the defect.
  10. 10. The method for controlling the ultrasonic sensor in the crimping region of the power transmission hardware based on the dual-mode focusing, which is characterized in that: The quantified morphological and acoustic feature vectors specifically comprise geometric features, acoustic response features and spatial position features; Wherein the geometric characteristics comprise volume, equivalent diameter, surface area, length-width ratio, sphericity and main axis direction; the acoustic response characteristics comprise average echo amplitude, maximum echo amplitude, echo amplitude standard deviation and signal energy integration; the spatial position features include the distance of the defect center from the hardware surface, from the center of the crimp zone, and from the edge.
  11. 11. The method for controlling the ultrasonic sensor in the crimping region of the power transmission fitting based on the dual-mode focusing according to any one of claims 2 to 10, wherein the method comprises the following steps: The ultrasonic pulse of 15ms is a wideband or narrowband coded excitation signal; The ultrasonic pulse of 3ms is a narrow pulse excitation signal.
  12. 12. A system for the dual mode focus based power transmission hardware crimp zone ultrasonic sensor control method of any one of claims 1-11, comprising: The ultrasonic array module comprises a central core array element group and a peripheral edge array element group, and is used for transmitting scanning signals and receiving reflected echoes; And the controller is used for controlling the emission scanning signals of the ultrasonic array module and recording, processing and storing the reflected echoes of the ultrasonic array module.
  13. 13. The system according to claim 12, wherein: the central core array element group consists of 13 ultrasonic sensors which are arranged in 7 groups of transverse and 7 groups of vertical and vertical crossed arrays; The peripheral edge array element group is provided with a plurality of groups at the periphery of the central core array element group.
  14. 14. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method for controlling an ultrasonic sensor in a crimping zone of a power transmission fitting based on dual mode focusing according to any one of claims 1-11.
  15. 15. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of the method for controlling an ultrasonic sensor for a crimping zone of power transmission hardware based on dual mode focusing according to any one of claims 1-11.

Description

Dual-mode focusing-based power transmission hardware crimping zone ultrasonic sensor control method, system, storage medium and equipment Technical Field The invention relates to the technical field of ultrasonic detection of electric power compression fittings, in particular to a method for controlling an ultrasonic sensor in a crimping area of a power transmission fitting based on dual-mode focusing. Background The crimping power transmission hardware fitting is a key connecting part in a high-voltage power transmission line, and the internal crimping quality of the crimping power transmission hardware fitting directly determines the mechanical strength and the electric conductivity of a wire. The interior defects such as cracks, uncompacted and overburning are strong in concealment, the traditional detection method such as X-rays has the problems of radiation safety, heavy equipment and the like, and the traditional ultrasonic detection has poor effect due to complex hardware structure and difficult effective coverage of the whole crimping area by sound beams. Although the existing phased array ultrasonic technology can realize deflection and focusing of sound beams, when a crimping area with obvious anisotropism is detected, a single focusing mode is difficult to be compatible with the detected penetrating power and resolution. The center focusing mode has strong penetrating power but insufficient edge resolution, and the edge focusing mode has high resolution but weak detection capability in the center region. Disclosure of Invention The invention aims to provide a method, a system, a storage medium and equipment for controlling an ultrasonic sensor in a crimping area of a power transmission fitting based on dual-mode focusing, so as to solve the problems in the prior art proposed by the background technology. In order to achieve the purpose, the invention provides the following technical scheme that the power transmission hardware crimping area ultrasonic sensor control method based on dual-mode focusing comprises the following steps: S1, initializing a system, namely configuring pulse width parameters of two scans; s2, performing first wave scanning, namely controlling a central core array element group to emit first long pulses, and simultaneously controlling a peripheral edge array element group to emit first short pulses to form a central depth focusing sound field; S3, executing second wave scanning, namely controlling a core array element group of a center to emit second short pulses and simultaneously controlling a peripheral edge array element group to emit second long pulses to form an edge high-resolution focusing sound field; S4, data acquisition, namely synchronously acquiring and storing full matrix echo data of two wave times; s5, fusion processing is carried out on the full matrix data of the two wave times, a three-dimensional acoustic image inside the compression fitting is rebuilt, and automatic identification and positioning of defects are carried out. Preferably, S2 performs a first wave scan, specifically as follows: the controller sends a first excitation time sequence instruction to all the transmitting modules in the ultrasonic array module; controlling 15 core modules positioned in a central array element group of a central area of the array to emit ultrasonic pulses lasting 15 ms; simultaneously controlling the array element group at the peripheral edge to emit ultrasonic pulses lasting for 3 ms; and focusing and deeply focusing the energy of the sound beam to the inner central area of the crimping fitting. Preferably, after the first wave scanning is performed in S2, the second wave scanning is performed in S3, which is specifically as follows: The controller sends a second excitation time sequence instruction to the ultrasonic array module; controlling 13 core modules positioned in a central array element group of a central area of the array to emit ultrasonic pulses lasting for 3 ms; simultaneously controlling the array element group at the peripheral edge to emit ultrasonic pulses lasting 15 ms; deflection and focusing of the acoustic beam energy to the inner edge and near-surface region of the crimp fitting. Preferably, the S4 data acquisition is specifically as follows: the ultrasonic array module receives a reflected echo from the inside of the hardware fitting; The controller records and stores the complete a-scan signal data sets of S2 and S3, respectively. Preferably, the S5 fusion processing, the fusion imaging and defect identification of the detection data collected and stored in the S4 are specifically as follows: carrying out data layer fusion on the depth data of the central area acquired in the step S2 and the high-resolution data of the edge area acquired in the step S3; Constructing a three-dimensional acoustic image inside the crimping fitting; and automatically identifying and positioning the defects based on the image features. Preferably, the depth data