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Arrayed omnidirectional type horizontal shear modal magnetostrictive transducer

A horizontal shear, magnetostrictive technology, applied in the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, ultrasonic/sonic waves/infrasonic waves to generate, etc.

Active Publication Date: 2015-11-04
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on sensors that can excite omnidirectional horizontal shear mode guided waves in plates

Method used

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  • Arrayed omnidirectional type horizontal shear modal magnetostrictive transducer
  • Arrayed omnidirectional type horizontal shear modal magnetostrictive transducer
  • Arrayed omnidirectional type horizontal shear modal magnetostrictive transducer

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with drawings and embodiments.

[0033] Based on the magnetostrictive effect, an array type omnidirectional horizontal shear mode magnetostrictive sensor is designed, and the sensor is used to excite a SH with a single mode and a consistent circumferential direction on the aluminum plate. 0 Modal guided waves.

[0034] The structure diagram of the array omnidirectional horizontal shear mode magnetostrictive sensor is as follows: figure 1 As shown, it includes a support sleeve 1, a NdFeB magnet 2, a fan-shaped array-type folded coil 3 in a flexible circuit board, and a circular nickel sheet 4. The detection object is an aluminum plate with a specification of 1000×1000×1 (unit: mm). Figure 6.1-6.2 is the ultrasonic guided wave group velocity and phase velocity dispersion curve of the aluminum plate above. When the wavelength λ is determined, the frequency of the generated horizontal shear wave can be...

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Abstract

The present invention provides a double-layer sector array folded coil structure integrated in a flexible circuit board, and designs and develops an arrayed omnidirectional type horizontal shear modal magnetostrictive transducer. Based on the magnetostrictive effect of ferromagnetic material nickel, the transducer realizes excitation of omnidirectional horizontal shear modal SH wave in the plate structure. Test verifies that the developed arrayed omnidirectional type horizontal shear modal magnetostrictive transducer can excite single SH0 modal waveguide inaluminum plate, and verifies that the developed omnidirectional type horizontal shear modal magnetostrictive transducer has better frequency response characteristics. The developed omnidirectional type horizontal shear modal magnetostrictive transducer and an array combined imaging algorithm can achieve efficient defect imaging on plate structure in wide range and board structure, and has very great value and potential in health monitoring and non-destructive evaluation of the plate structure.

Description

technical field [0001] The invention is an arrayed omnidirectional horizontal shear mode magnetostrictive sensor, which belongs to the field of ultrasonic nondestructive testing, and can excite SH propagating along a 360° direction in a plate structure. 0 Modal guided waves. Background technique [0002] Sheet metal structures are widely used in aerospace, civil engineering, machinery and other fields. In the process of production and use, the metal plate structure will inevitably be damaged, which greatly reduces the service life of the material. In order to ensure the safety of the use of metal plate structures, it is necessary to carry out non-destructive testing on them. As a fast and efficient nondestructive testing method, ultrasonic guided wave technology has been widely used in nondestructive evaluation and health testing of various engineering structures such as plates, pipes and rods. The ultrasonic guided wave detection test needs to select the appropriate dete...

Claims

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Application Information

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IPC IPC(8): G01N29/34G01N29/04
Inventor 龚裕谢穆文吉美宁胡亚男刘增华何存富吴斌
Owner BEIJING UNIV OF TECH
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