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Flexible method for detecting quality of curved surface of head of high-speed train

A quality inspection method, high-speed train technology, applied in the direction of measuring devices, optical testing flaws/defects, instruments, etc., can solve the problems of blank high-precision inspection methods for large parts, and achieve complex surface inspection in space, easy storage, and inspection Informative and comprehensive effect

Inactive Publication Date: 2018-06-05
DALIAN JIAOTONG UNIVERSITY
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Problems solved by technology

[0011] According to the technical problems raised above, a flexible quality detection method for the curved surface of the high-speed train head is provided, which is used to solve the problem that the application of the existing three-dimensional scanning technology in quality detection is still limited to general small parts. Before scanning small parts, it is often necessary to clamp and position the parts to ensure the reliability of the positioning, and then scan and measure the parts. However, the high-precision detection method for large parts is still blank.

Method used

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  • Flexible method for detecting quality of curved surface of head of high-speed train

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specific Embodiment approach

[0049] The specific implementation method comprises the following steps:

[0050] S1. Paste the mark points and code points on the surface of the tested part. The layout requirements of the mark points are: adjacent mark points, the distance between the two points is 5cm-10cm, arranged in an irregular triangle in random order, and do not Put it on the corner of the object.

[0051] In step S1, the marking point is a circular sticker with reflective material on the inner circle and a black circle on the outer circle; the coding point is a square tile with reflective material arranged irregularly inside.

[0052] The part to be tested is a large frame part with a length exceeding 4 meters.

[0053] S2. Fix a high-precision measuring scale in the area to be scanned. The measuring scales should be placed perpendicular to each other and must be stable.

[0054] S3. Use the close-range three-dimensional photogrammetry system to take all-round and multi-angle shots of the measured ...

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Abstract

The invention discloses a flexible method for detecting the quality of the curved surface of a head of a high-speed train, and the method comprises the following steps: S1, pasting a mark point and acoding point on the surface of a detected part; S2, fixing a high-precision measurement scale in a scanned region; S3, carrying out the omnibearing and multi-angle shooting of the detected part of thehead of the high-speed train through a close-shot three-dimensional photogrammetry system, and constructing a global coordinate system; S4, scanning the surface of the head of the high-speed train through three-dimensional scanning equipment, and obtaining the point cloud data of the surface of the head. According to the invention, the method combines the close-shot three-dimensional photogrammetry system and a hand-held three-dimensional scanner, achieves the precise measurement of the head, exceeding a measurement range, of the high-speed train, effectively controls the registration precision of multi-view point cloud in a three-dimensional scanning process, guarantees the measurement precision of a large-scale part, and solves a problem that the manufacturing quality of the curved surface of the head of the high-speed train is difficult to detect.

Description

technical field [0001] The invention relates to the technical field of quality detection, and relates to a flexible detection method for the quality of a complex curved surface of a high-speed train head. Background technique [0002] During the running of high-speed trains, the locomotive is the main part of the windward force, and the manufacturing accuracy of its surface is directly related to the windward force distribution and operation safety of the high-speed train. The quality inspection of the front part of the high-speed train has always been a difficult point in the inspection technology. [0003] In the current production process, the front of the car is mainly tested by making a special model, which is a rigid solution. [0004] Its main disadvantages are manifested in the following aspects: [0005] (1) It can only be limited to the measurement of a single quality parameter, and it is necessary to make a variety of different inspection tools for the detection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24G01N21/88
CPCG01B11/24G01N21/8851G01N2021/8887
Inventor 尤学文曲宝章卢碧红李照祥徐超孙介夫
Owner DALIAN JIAOTONG UNIVERSITY
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