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A true-time-delay frequency-dispersion-free SH0 wave phased array used for plate-shaped structure detection

A structure detection and true time delay technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, and processing response signals of detection, etc. , low efficiency and other problems, to achieve the effect of intuitive imaging, high detection efficiency, and improved detection accuracy

Inactive Publication Date: 2017-11-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional ultrasonic phased array has problems such as small detection range, large attenuation, low efficiency, and difficulty in visually imaging the damage in the plate in the detection of plate-like structures.

Method used

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  • A true-time-delay frequency-dispersion-free SH0 wave phased array used for plate-shaped structure detection
  • A true-time-delay frequency-dispersion-free SH0 wave phased array used for plate-shaped structure detection
  • A true-time-delay frequency-dispersion-free SH0 wave phased array used for plate-shaped structure detection

Examples

Experimental program
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Effect test

Embodiment 1

[0059] A True Time-Delay Dispersion-Free SH for Damage Detection of Plate Structures 0 wave phased array systems such as image 3 As shown, it includes: controller 1, multi-channel D / A converter 2, multi-chip SH wave phased array probe 3, multi-channel relay 4, multi-channel A / D conversion acquisition card 5, imaging display 6,

[0060] The electrical signal of the controller 1 is connected to the multi-channel D / A converter 2, and the multi-channel D / A converter 2 is connected to the multi-chip SH wave phased array probe 3 through the electrical signal of the multi-channel relay 4;

[0061] The multi-chip SH wave phased array probe 3 is connected to the multi-channel A / D conversion acquisition card 5 through the multi-channel relay 4 electrical signal, the multi-channel A / D conversion acquisition card 5 is connected to the controller 1 by electrical signal, and the electrical signal of the controller 1 is connected to the imaging monitor6.

[0062] The multi-channel digital...

Embodiment 2

[0096] Using LISA numerical simulation running on GPU, the model is an aluminum plate with a size of 800mm×500mm×1.6mm, Young’s modulus is 71.0GPa, Poisson’s ratio ν is 0.33, and density is 2700kg / m 3 . 16 pieces of d with a size of 7×7×0.5mm 36 Each piezoelectric film is spaced at 1 mm to form a phased array system located in the center. The excitation signal is a 3-cycle narrowband signal (tone-burst signal) modulated by 16 Hanning windows with different time delays.

[0097] The time delays of the 16 piezoelectric sheets are respectively calculated according to the delay formula in Example 1, so that they are focused at 100mm, 0°, because there is no dispersion SH 0 A wave is an in-plane wave, so in Figure 11 Only the in-plane x-direction and y-direction displacement component plots are shown in . It can be seen from the figure that the true time delay has no dispersion SH 0 The wave phased array has a very strong displacement in the y direction, which proves that the...

Embodiment 3

[0108] In addition to the wave field measurement results in the z direction of the laser vibrometer, the control true time delay without dispersion SH 0 The time delay sequence of the wave phased array detection system makes the focus point increase from 50mm to 250mm in steps of 25mm, and the focus angle increases from -90° to 90° in steps of 15°, scanning the entire area to be detected, using passive A phased array system receives the signal and determines the location of the damage. The damage is Figure 20 shown. The size of the permanent magnet is 38.1mm×12.7mm, which is pasted on the 150mm of the aluminum plate at 0° to simulate damage. The center frequency of the excitation signal is 40kHz, and the signal sampling frequency is 1MHz.

[0109] Dispersion-free SH in healthy and damaged conditions respectively 0 Wave passive phased array received signal storage and analysis. The signal received by the sensor is as Figure 21 As shown, the difference signal of the damag...

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Abstract

A true-time-delay frequency-dispersion-free SH0 wave phased array used for plate-shaped structure detection is disclosed. The system includes a controller, a multichannel digital / analog converter, a multi-chip SH wave phased array probe, a multichannel replay, a multichannel analog / digital conversion collecting card, and an imaging display. The multi-chip SH0 wave phased array probe converts a voltage signal into a fluctuation signal through an inverse piezoelectric effect and the fluctuation signal is excited in a structure. In a receiving stage, a fluctuation signal reflected by damage is converted into an electric signal according to a direct piezoelectric effect. An emission signal of the multichannel digital / analog converter is connected to the multi-chip SH0 wave phased array probe by the multichannel replay in an emission stage, and the multi-chip SH0 wave phased array probe is connected to the multichannel analog / digital conversion collecting card after the emission stage is finished and is used for collecting damage echo signals. As SH0 wave itself has a characteristic of no frequency dispersion, damage of a plate-shaped structure is detected by the system, the spatial domain resolution ratio is increased, and damage reflected signals are amplified.

Description

technical field [0001] The patent of the present invention relates to a true time-delay non-dispersion SH for plate structure detection 0 wave phased array system. Background technique [0002] Ordinary ultrasonic testing is a structural damage detection method with a single probe, and the obtained one-dimensional signal cannot be imaged intuitively in a single measurement, while the phased array detection method composed of multiple probes can detect and image structural damage. Ultrasonic phased array damage detection originated from phased array radar in the military, both of which are based on the Huygens principle: one transmits and receives ultrasonic beams for damage detection, and the other uses electromagnetic waves for target tracking. The probe of the ultrasonic phased array is composed of a group of piezoelectric transducer (PZT) units independent of each other, each unit can transmit and receive ultrasonic waves independently, and the phases of ultrasonic waves...

Claims

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Application Information

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IPC IPC(8): G01N29/04G01N29/06G01N29/44
CPCG01N29/041G01N29/069G01N29/4427
Inventor 王文韬李惠
Owner HARBIN INST OF TECH
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