CN-121994156-A - DIC-based pressure cylinder equipment deformation evaluation method

CN121994156ACN 121994156 ACN121994156 ACN 121994156ACN-121994156-A

Abstract

The invention discloses a deformation evaluation method of pressure cylinder equipment based on DIC, which is characterized in that strain test tests and DIC test tests are respectively carried out, standard deviation between radial deformation of a tank body under different inflation pressures of the two methods is calculated, if the standard deviation is larger than a set threshold value, an image of a change curve of the inflation pressure-radial deformation corresponding to the strain test is input into a feature extraction network to extract features, and the extracted features and the image of the change curve of the inflation pressure-radial deformation corresponding to the DIC test are input into a generation network together to obtain corrected images. And acquiring a change curve of the target inflation pressure-radial deformation based on the corrected image, so as to evaluate the deformation condition of the pressure cylinder device. The engineering application of the deformation monitoring of the pressure cylinder equipment provides a convenient and effective thought, and has important scientific significance for deformation monitoring and structure evaluation.

Inventors

Xian Zijin
DAI ZHIHAO
ZENG JIAO

Assignees

四川凌峰航空液压机械有限公司

Dates

Publication Date: 20260508
Application Date: 20251224

Claims (6)

1. A DIC-based pressure cylinder apparatus deformation assessment method, comprising the steps of: Step S1, carrying out a pressure cylinder strain test, arranging a plurality of strain gauges on the circumferential direction of the outer side of the pressure cylinder, and collecting strain data of the strain gauges; S2, calculating radial deformation of the tank body under different inflation pressures based on circumferential strains of the pressure cylinder under different inflation pressures, and drawing a change curve of the inflation pressure-radial deformation; Step S3, building a DIC test platform, developing a DIC test of the pressure cylinder, obtaining radial deformation of the tank body under different inflation pressures based on DIC analysis and processing, and drawing a change curve of the inflation pressure-radial deformation; Step S4, calculating standard deviation between the radial deformation of the tank body under different inflation pressures based on the radial deformation of the tank body in the step S2 and the step S3, and converting the change curves of the inflation pressure-radial deformation in the step S2 and the step S3 into images if the standard deviation is larger than a set threshold value; Step 5, constructing a feature extraction network based on the neural network, and inputting the image correspondingly converted in the step 2 into the feature extraction network to extract features; and S6, acquiring a change curve of the target inflation pressure-radial deformation based on the corrected image, so as to evaluate the deformation condition of the pressure cylinder device.
2. The DIC-based pressure cylinder apparatus deformation evaluation method according to claim 1, wherein in the step S2, the calculation formula of the radial deformation amount of the tank under different inflation pressures is: (1); (2); (3); wherein L is the circumferential length of the tank body before deformation; L' is the circumferential length of the deformed tank body; Δl is the difference in circumferential length of the can before and after deformation; Epsilon is the circumferential strain of the tank body; Δr is the radial deformation of the tank; r' is the radial deformation amount of the tank body after deformation; And r is the radial deformation amount of the tank body before deformation.
3. The DIC-based pressure cylinder apparatus deformation evaluation method according to claim 2, wherein the step S2 is to calculate the radial deformation amount of the tank body at different inflation pressures based on the average circumferential strain of the pressure cylinder at different inflation pressures.
4. The DIC-based pressure cylinder apparatus deformation assessment method according to claim 1, wherein in the step S3, the DIC test platform comprises a test bench and a high-speed camera, the test bench is provided with a pressure cylinder to be tested, one side of the test bench is provided with the high-speed camera, and the pressure cylinder is sprayed with speckles, and the high-speed camera is used for tracking and photographing speckle images of the surface of the pressure cylinder.
5. The DIC-based pressure cylinder apparatus deformation evaluation method according to any one of claims 1-4, wherein the step S2 and the step S3 obtain the variation curves of the inflation pressure-radial deformation amount in the ranges of 0 to 16 MPa, 16 to 42 MPa, and 42 to 56 MPa, and 56 to 84 MPa, respectively.
6. The DIC-based pressure cylinder apparatus deformation evaluation method according to claim 5, wherein in the step S4, the standard deviation of the radial deformation amount of the tank in different ranges is calculated under different inflation pressure ranges.

Description

DIC-based pressure cylinder equipment deformation evaluation method Technical Field The invention belongs to the technical field of deformation monitoring of pressure-bearing equipment, and particularly relates to a pressure cylinder equipment deformation evaluation method based on DIC. Background Conventional measurement techniques have significant limitations with respect to deformation monitoring of the pressure cylinder. For example, although the resistance strain foil method has high measurement accuracy, the method is essentially discrete point measurement, and has inherent defects that the layout of measuring points depends on priori knowledge, and the whole deformation field of the structure and an unknown stress concentration area are difficult to comprehensively capture. In addition, the strain gauge mounting process is complex, is sensitive to environmental factors such as temperature, electromagnetic interference and the like, and stability is challenging in long-term monitoring. On the other hand, the classical optical measurement method represented by electronic speckle interferometry can realize full-field measurement, but the measurement accuracy is seriously dependent on an optical platform with strict vibration isolation, is extremely sensitive to environmental vibration, and greatly limits the wide application of the method in industrial field environments. Digital Image Correlation (DIC) presents significant overall advantages as a non-contact, full-field optical measurement technique. The method has the core technology that the accurate reconstruction of the full-field displacement and the strain field of the to-be-detected area is realized by tracking the speckle image of the surface of the object. The method not only avoids complex sensor layout and wire connection, but also can intuitively reveal the global deformation behavior of the structure without omission, and is particularly good at locating unexpected stress concentration and local instability areas. The DIC technology has higher tolerance to environmental vibration, does not need strict vibration isolation conditions, has wide-range measurement capability from micro-strain level to large-scale buckling, and can be combined with a high-speed photographic technology to realize accurate capture of a dynamic deformation process. Therefore, the DIC technology effectively overcomes the defects of incomplete traditional point measurement information and poor field applicability of the classical optical method, and provides a powerful technical means for laboratory research and industrial field detection. In the field of pressure cylinder structural deformation monitoring, digital Image Correlation (DIC) techniques exhibit significant advantages over conventional measurement methods. The non-contact optical measurement technology can realize the accurate reconstruction of the global three-dimensional deformation field by tracking and analyzing the time sequence image of the random speckle field on the surface of the pressure-bearing equipment under the load effect. The method has the core value that on one hand, the limitation of point-type measuring methods such as a resistance strain gauge is broken through, the complete strain distribution including stress concentration areas on the surface of the cylinder body can be captured without omission, global visual data support is provided for nonlinear behavior analysis such as local buckling, plastic hinge formation and the like, and on the other hand, compared with an optical method such as electronic speckle interferometry and the like which is harsh to vibration isolation conditions, the DIC technology has stronger industrial field adaptability, and can still maintain micro-strain level measuring accuracy under the condition of no strict vibration isolation. By combining the stereoscopic vision and speckle preparation process, the method can be effectively applied to full-field strain and deformation monitoring of the pressure cylinder, provides an irreplaceable technical means for ultimate bearing capacity evaluation and failure mechanism research of pressure equipment, and has important scientific value and engineering significance. Disclosure of Invention The invention aims to provide a deformation evaluation method of pressure cylinder equipment based on DIC, aiming at monitoring and evaluating the deformation of the pressure cylinder equipment based on a DIC test means. The invention is realized mainly by the following technical scheme: a DIC-based pressure cylinder apparatus deformation assessment method comprising the steps of: Step S1, carrying out a pressure cylinder strain test, arranging a plurality of strain gauges on the circumferential direction of the outer side of the pressure cylinder, and collecting strain data of the strain gauges; S2, calculating radial deformation of the tank body under different inflation pressures based on circumferential strains of the press