Ultrasonic guided wave long-distance detection method based on axial local scanning of pipeline
An ultrasonic guided wave and distance detection technology, which is applied in the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, can solve the problems of long-distance pipeline identification and positioning difficulties, eliminate the influence of interference modes, and improve the signal-to-noise ratio of detection signals , the effect of reducing the effect of dispersion
Pending Publication Date: 2022-07-01
XI AN JIAOTONG UNIV
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
These factors lead to a large number of multi-mode echo signals with unknown mechanisms in the ultrasonic guided wave time-domain signal, making it very difficult to identify and locate defects in long-distance pipelines. The traditional single-point guided wave detection method and signal processing method have certain limitations. limitation
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0023] The technical solutions of the present invention will be further described and described in detail below in conjunction with the specific embodiments of the present invention and the corresponding accompanying drawings. The described embodiments are only some, but not all, embodiments of the invention. All other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.
[0024] Example steps such as figure 2 shown, the details are as follows:
[0025] S1. Such as figure 1 As shown in the figure, the non-contact ultrasonic guided wave probe is covered in the scanning area, and the probe is moved along the axial direction of the pipeline for scanning detection. The probe detection mode is a single probe mode with self-excitation and self-test. The excitation signal is a sinusoidal 4-period series pulse, the excitation frequency is 260kHz, the wavenumber is 50rad / m calculated according to the disp...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses an ultrasonic guided wave long-distance detection method based on axial local scanning of a pipeline, and belongs to the field of ultrasonic nondestructive detection. The method comprises the following steps: firstly, carrying out one-dimensional axial scanning of a local area on a detected pipeline by using an ultrasonic guided wave probe, obtaining a group of long-distance detection time domain signals of ultrasonic guided waves at different positions, and then carrying out frequency-wavenumber domain two-dimensional filtering processing on the obtained time domain signal set to obtain a detection signal set for noise reduction and interference signal removal; and finally obtaining a single-mode time domain signal easy to analyze through delay superposition virtual focusing enhancement, and obtaining a guided wave detection signal with a high signal-to-noise ratio. For ultrasonic guided wave detection of a long-distance pipeline, the method has the advantages that the signal-to-noise ratio of a detection signal can be effectively and greatly improved, the influence of an interference mode is eliminated, the frequency dispersion influence of long-distance guided wave transmission is reduced, and the like, so that the detection sensitivity of defects of the long-distance pipeline is improved.
Description
technical field [0001] The invention relates to the technical field of ultrasonic guided wave non-destructive testing, in particular to an ultrasonic guided wavelength distance detection method based on axial local scanning of pipelines, which can realize modal purification, noise reduction and echo of long-distance pipeline guided wave detection signals distinguish. Background technique [0002] The pipeline structure is widely used in various important industrial fields such as petrochemical industry and power energy. During the long-term service process, due to thermal stress, fluid erosion, etc., the pipeline wall is prone to various defects such as corrosion and cracks. In order to avoid such defects It is necessary to conduct regular and efficient non-destructive testing for pipeline cracking, leakage and other problems. Ultrasonic guided wave nondestructive testing technology takes advantage of the fact that guided waves can propagate for a long distance and in a lar...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G01N29/04
CPCG01N29/04G01N2291/0289
Inventor裴翠祥刘天浩解晨曦陈振茂
OwnerXI AN JIAOTONG UNIV