Simulation method for steel rail welding seam detection based on CIVA

Abstract

The invention relates to the technical field of steel rail welding seam detection, in particular to a simulation method for steel rail welding seam detection based on CIVA. Based on a CIVA simulation technology, simulation of sound beam propagation and interaction between sound beams and defects or workpieces can be carried out; simulation can simulate the whole detection process; different probes, workpieces and defects are simulated; when the method is applied to steel rail welding seams, the understanding and learning of flaw detection personnel on phased array ultrasonic detection can be effectively improved, the effects of various welding seam flaw detection processes can be quickly simulated, and the method has the advantages of quantification and visualization.

Description

Technical Field

[0001] The invention relates to the technical field of rail weld detection, and in particular to a simulation method for rail weld detection based on CIVA. Background Art

[0002] At present, most urban rail transit track systems use 25m standard fixed-length rails for on-site welding to achieve seamless lines. Compared with the high-speed rail integral track bed that uses 100m or 500m fixed-length rails for on-site welding, the number of welds produced by on-site welding is 4 times or 20 times that of the above two methods respectively.

[0003] In terms of rail base material flaw detection, there are rail flaw detection vehicles and double-track rail flaw detectors that can quickly detect during driving, which has improved efficiency compared to traditional manual operations. However, since there is a weld point every 25m for rail welds, and there is no continuous detection method due to the influence of fasteners and limits, it has become a difficult problem for the line department to improve the efficiency of flaw detection. Research on automated weld detection to improve the efficiency of single weld detection has become a major technical breakthrough.

[0004] At present, rail weld flaw detection accounts for more than 80% of the total workload of rail flaw detection. As the service life of the track increases, the number of rail welds caused by replacing damaged rails continues to increase, which further increases the workload of weld flaw detection and makes it more difficult to complete the weld flaw detection plan within a fixed period. Therefore, if there is no breakthrough in the efficiency of rail weld flaw detection, the safety of rail welds will be more difficult to ensure in the future, which will affect the safety of driving.

[0005] At present, the research on rail weld flaw detection technology is still carried out by calculation and actual testing. In theoretical calculation, the propagation path of ultrasonic wave in the workpiece is inferred based on the ultrasonic probe parameter information, the shape, size and material of the workpiece to be inspected.

[0006] The disadvantage is that the theoretical calculation process of phased array ultrasonic wave is complicated and difficult, and the results are abstract and not intuitive, which is not conducive to the learning and understanding of flaw detectors. In addition, the actual test method is limited by the influence of the physical object, and a large number of probes and test blocks with different parameters need to be produced, which is costly. Summary of the invention

[0007] The object of the present invention is to solve the deficiencies of the prior art and to provide a simulation method for rail weld detection which quantifies and visualizes the interaction between an acoustic beam and a defect or a workpiece.

[0008] To achieve the above object, the present invention provides a simulation method for rail weld detection based on CIVA, and the specific steps are as follows:

[0009] S1. Call or build a simulation model of rail weld and phased array ultrasonic probe;

[0010] S2. define and set the parameters of defects or damage in the constructed rail weld simulation model;

[0011] S3. Parameter settings before simulation testing, including parameters of the rail weld simulation model and parameters of the phased array probe simulation model;

[0012] S4. Start the simulation test to simulate the interaction between the propagation process of ultrasonic waves in the rail weld and the defects or damages;

[0013] S5. Collect the data from the above simulation tests, and organize and analyze the data according to needs.

[0014] Preferably, the simulation model in step S1 includes a two-dimensional model or a three-dimensional model.

[0015] Preferably, the parameters in step S2 include the location, size and properties of the rail weld simulation model.

[0016] Preferably, the parameters of the rail weld simulation model in step S3 include settings of a detection surface, a bottom surface, and a side surface.

[0017] Preferably, the parameters of the phased array probe simulation model in step S3 include focus, main acoustic beam and scanning mode.

[0018] Preferably, step S4 includes calculating, quantifying and imaging the ultrasonic signals of the ultrasonic waves received by the probe and the structure, defects or damage of the workpiece by computer.

[0019] Preferably, the step S5 includes outputting the simulation test data into a corresponding fan-scan imaging diagram or a line-scan forming diagram, and finally displaying it in the form of a two-dimensional or three-dimensional simulation model.

[0020] Compared with the prior art, the technical solution proposed in the present application has the following beneficial effects: the present invention is based on CIVA simulation technology, which can simulate the propagation of the sound beam and the interaction between the sound beam and the defect or workpiece; the simulation can simulate the entire detection process; simulate different probes, workpieces and defects; the application of this method in rail welds can effectively improve the understanding and learning of phased array ultrasonic testing by flaw detectors, and can quickly simulate the effects of various weld flaw detection processes, and its performance has the advantages of quantification and visualization. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0022] Figure 1 The figure is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe and discuss the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings of the present invention. Obviously, what is described here is only a part of the examples of the present invention, not all the examples. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] The present invention provides a simulation technology based on CIVA, which can simulate the propagation of sound beams and the interaction between sound beams and defects or workpieces; the simulation can simulate the entire detection process; simulate different probes, workpieces and defects. The application of this method in rail welds can effectively improve the understanding and learning of phased array ultrasonic testing by flaw detectors, and can quickly simulate the effects of various weld flaw detection processes, and its performance has the advantages of quantification and visualization.

[0027] The specific steps are as follows:

[0028] 1. Call or build a 2D / 3D simulation model of rail weld from the local simulation model library, including the physical information related to ultrasonic propagation such as the dimensions, material and welding method of the inspected workpiece;

[0029] 2. Call or build a 2D / 3D simulation model of defects or damage from the local simulation damage library, including the nature of the defects or damage (such as cracks, pores and slag inclusions, etc.), size and other physical information related to ultrasonic propagation;

[0030] 3. Combine the constructed rail weld simulation model with defects (damage). Defects (damage) can be defined at any part of the rail weld simulation model, such as rail head, rail waist, rail bottom, etc., and are not limited in quantity and form;

[0031] 4. Call or build a two-dimensional or three-dimensional simulation model of a phased array ultrasonic probe from the local probe simulation library, including physical information related to ultrasonic propagation, such as the wedge size and material, number of array elements, and center distance of array elements of the phased array ultrasonic probe;

[0032] 5. Import the rail weld simulation model into the project and set the inspection information of the inspected workpiece, such as the inspection surface, bottom surface and side surface;

[0033] 6. Import the phased array ultrasonic probe into the project and input the position of the probe on the test surface according to the coordinate axis;

[0034] 7. Using the focusing law of ultrasonic phased array technology, the angle, focus, number of excitation array elements, main sound beam and other physical information of the phased array ultrasonic probe can be set at the interface, and the probe scanning mode can be selected as fan scanning / cross scanning;

[0035] 8. Excite the phased array ultrasonic probe simulation model to simulate the interaction between the propagation process of ultrasonic waves and defects (damage) in the rail weld simulation model. Through computer calculation, quantify and visualize the ultrasonic signals received by the probe and the workpiece structure and defects (damages). Output the corresponding sector scan image or line scan image, and then present it in the form of a two-dimensional / three-dimensional simulation model.

[0036] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and one or more of the above embodiments are combined into one embodiment. Those skilled in the art can make various changes or modifications or combinations within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

Claims

1. A simulation method for rail weld detection based on CIVA, characterized in that: The specific steps are as follows: S1. Call or build a simulation model of rail weld and phased array ultrasonic probe; S2. define and set the parameters of defects or damage in the constructed rail weld simulation model; S3. Parameter settings before simulation testing, including parameters of the rail weld simulation model and parameters of the phased array probe simulation model; S4. Start the simulation test to simulate the interaction between the propagation process of ultrasonic waves in the rail weld and the defects or damages; S5. Collect the data from the above simulation tests, and organize and analyze the data according to needs.

2. The simulation method for rail weld detection based on CIVA according to claim 1, characterized in that: The simulation model in step S1 includes a two-dimensional model or a three-dimensional model.

3. The simulation method for rail weld detection based on CIVA according to claim 1, characterized in that: The parameters in step S2 include the location, size and properties of the rail weld simulation model.

4. The simulation method for rail weld detection based on CIVA according to claim 1, characterized in that: The parameters of the rail weld simulation model in step S3 include settings of the detection surface, bottom surface, and side surface.

5. The simulation method for rail weld detection based on CIVA according to claim 1, characterized in that: The parameters of the phased array probe simulation model in step S3 include focus, main acoustic beam and scanning mode.

6. The simulation method for rail weld detection based on CIVA according to claim 1, characterized in that: The step S4 includes calculating, quantifying and imaging the ultrasonic signals of the ultrasonic waves received by the probe and the structure, defects or damage of the workpiece by computer.

7. The simulation method for rail weld detection based on CIVA according to claim 1, characterized in that: The step S5 includes outputting the simulation test data into a corresponding fan-scan imaging diagram or a line-scan forming diagram, and finally displaying it in the form of a two-dimensional or three-dimensional simulation model.

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