Ultrasonic detecting method of defects in thick-wall composite tubular structure

A tubular structure, ultrasonic testing technology, applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, processing the response signal of detection, etc., can solve the problem of not considering the diversity of defects, and achieve the effect of quantitative analysis and high precision

Active Publication Date: 2016-03-09
PEKING UNIV
View PDF6 Cites 28 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are still some deficiencies, which are mainly reflected in: 1) the research object is only a simple small-scale structure of all-composite materials; 3) the research problem is mainly focused on the detection method of a single defect, and the...

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ultrasonic detecting method of defects in thick-wall composite tubular structure
  • Ultrasonic detecting method of defects in thick-wall composite tubular structure
  • Ultrasonic detecting method of defects in thick-wall composite tubular structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings.

[0038] Such as figure 1 As shown, the ultrasonic inspection device for defects in the thick-walled composite tubular structure of this embodiment includes: an ultrasonic longitudinal wave probe 2, an ultrasonic pulse generator / receiver 3, a digital oscilloscope 4, and a computer 5; The outer surface of the structure; the ultrasonic longitudinal wave probe is vertically pressed on the surface of the structure to be tested coated with coupling agent; the ultrasonic pulse generator / receiver emits ultrasonic waves as the incident wave to the structure to be tested 1, and the reflected wave reflected by the structure to be tested is generated by the ultrasonic wave The longitudinal wave probe receives; the received reflected wave is converted into a digital signal by the ultrasonic pulse generator / receiver, and then transmitted to the digital o...

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

No PUM Login to view more

Abstract

The invention discloses an ultrasonic detecting method of defects in a thick-wall composite tubular structure. The ultrasonic detecting method includes the steps that original signal data are obtained, final signal data are obtained with signal processing methods such as noise reduction, fast Fourier transforming and continuous wavelet transforming, and a wavelet-coefficient-amplitude-time graph is generated; according to the generated wavelet-coefficient-amplitude-time graph, the positions and the sizes of inside damage of a composite material layer and the positions and the sizes of the unsticking portions of the boundary between the composite material layer and a metal layer are extracted, and distribution of the thickness of the metal layer is calculated. The ultrasonic detecting method can be used for detecting the multiple defects of the tubular structure composed of composite materials and metal, damage positioning and size assessing are carried out through the corresponding signal processing technology, and quantitative analysis of the whole structure performance can be achieved; the ultrasonic detecting method is high in accuracy, free of reference signals, simple, easy to operate and capable of being used for field detecting.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to an ultrasonic testing method for defects in thick-walled composite tubular structures. Background technique [0002] Composite materials are widely used in aerospace, national defense, industry and other fields due to their excellent properties such as high strength, high rigidity, and good fatigue resistance. Composite tubular structures, as their basic structural methods, have also been greatly developed. The thick-walled composite tubular structure lined with metal combines the advantages of good performance of the full-composite tubular structure and low cost of metal gas cylinders, and has gradually become the main implementation method for gas cylinders, pipelines, oil tanks and other equipment. However, due to the complex manufacturing process and long service life of this structure, there will be various defects such as internal damage of the co...

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
no application Login to view more
IPC IPC(8): G01N29/04G01N29/44
CPCG01N29/04G01N29/44
Inventor 励争高桂云陈建霖卜宏利
Owner PEKING UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap