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Piezoelectric Transducer for Pipeline Ultrasonic Guided Wave Flaw Detection and Its Control Method and Application

A piezoelectric transducer, ultrasonic guided wave technology, used in the generation of ultrasonic/sonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, instruments, etc. Energy conversion efficiency and other issues

Active Publication Date: 2018-12-04
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the deformation of the thickness shear piezoelectric transducer tends to be simple shear without pressure, so the shear deformation is difficult to be effectively transmitted to the pipeline.
The pressurization device makes the dry-coupled piezoelectric transducer larger
On the other hand, the thickness-shear piezoelectric transducer has a high resonant frequency, usually much higher than the excitation frequency of the guided wave, so the transducer cannot be excited near the resonant frequency to improve energy conversion efficiency
The above two points make the dry-coupled piezoelectric transducer only suitable for pipeline nondestructive testing and not suitable for pipeline health monitoring

Method used

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  • Piezoelectric Transducer for Pipeline Ultrasonic Guided Wave Flaw Detection and Its Control Method and Application
  • Piezoelectric Transducer for Pipeline Ultrasonic Guided Wave Flaw Detection and Its Control Method and Application
  • Piezoelectric Transducer for Pipeline Ultrasonic Guided Wave Flaw Detection and Its Control Method and Application

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Embodiment 1

[0044] In order to further illustrate the effectiveness of the zero-order torsional guided wave T(0,1) of the piezoelectric transducer excitation single mode of the present invention, a design is used to excite the zero-order torsional wave T (0, 1) in a wall thickness of 3mm, an outer diameter of 100mm aluminum tube A piezoelectric transducer with an order torsional guided wave T(0,1). The design center frequency of the piezoelectric transducer is 150kHz, and the five-period sinusoidal signal modulated by the Hanning window is used as the excitation signal, so the highest frequency in the working frequency band is 210kHz. Depend on Figure 4 It can be seen that within 0-210 kHz, the highest circumferential order of the curved guided wave F(N,1) is 31, so the number of curved transducer plate units is 32. The curved surface transducer plate unit is made of polarized PZT-5H ceramics, the shape is square, the length of the upper surface is 6mm, and the minimum thickness h is 1....

Embodiment 2

[0047] In this embodiment, the piezoelectric transducers with 32 curved transducer plate units prepared in Embodiment 1 are used as sensors.

[0048] Figure 7 (a) shows the ultrasonic guided wave signal that is excited at 150kHz by a piezoelectric transducer with 12 transducer plates as a brake and received by a piezoelectric transducer with 12 transducer plates. It can be seen that besides the zero-order torsional guided wave T(0, 1), there are also curved guided wave modes excited. Figure 7 (b) shows that when the piezoelectric transducers with 32 curved transducer plate units prepared by the present invention are used as sensors, only the zero-order torsional guided wave T(0, 1) is detected, and the curved guided wave mode is detected filtered out. This shows that the invention can be used as a filter sensor, can greatly reduce the complexity of receiving signals, and has important application value.

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Abstract

The invention discloses a piezoelectric transducer used for ultrasonic guided wave based flaw detection of a pipeline as well as control methods and application thereof. The piezoelectric transducer is characterized in that the upper surfaces of n-numbered curved surface transduction plate units are uniformly boned with the lower surface of a flexible substrate; the upper surface of each curved surface transduction plate unit is a plane and the lower surface is a curved surface and clings to the outer surface of a tested pipeline as a working surface; the n-numbered parallel curved surface transduction plate units surround the outer surface of the tested pipeline by a circle. The piezoelectric transducer excites and receives the zero-order torsional guided wave T (0,1) in a single mode. The piezoelectric transducer provided by the invention has high energy conversion efficiency, small volume and compact size, can be directly jointed with the surface of the pipeline, is quite suitable for pipeline health monitoring and can be predicted to powerfully promote development of ultrasonic guided wave based pipeline health monitoring.

Description

technical field [0001] The invention relates to intelligent material and structural health monitoring technology, in particular to a piezoelectric transducer used for ultrasonic guided wave flaw detection of pipelines and its control method and application. Background technique [0002] As an important means of transportation, pipelines play an irreplaceable role in petroleum, chemical and other fields. By the end of 2013, my country had built more than 60,000 kilometers of natural gas pipelines, more than 26,000 kilometers of crude oil pipelines, and more than 20,000 kilometers of refined oil pipelines. Pipelines have become important infrastructure related to the lifeline of the national economy. In recent years, due to corrosion, accidental damage, wear and other factors, pipeline safety accidents at home and abroad have occurred frequently, resulting in huge loss of life and property. Therefore, the detection and evaluation of pipeline integrity is of great significance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/24G01N29/34
CPCG01N29/2437G01N29/346G01N2291/0289G01N2291/2636
Inventor 李法新苗鸿臣宦强王强中
Owner PEKING UNIV
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