Method for measuring the deformation of large-sized workpiece

A measurement method and large-scale technology, applied in the field of measurement, to achieve the effects of high measurement accuracy, short measurement cycle, and small measurement limitations

Inactive Publication Date: 2009-10-07
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] In order to overcome the deficiencies in the existing deformation measurement methods and meet the requirements of efficiency and workpiece size in actual industrial use, the present invention provides a large-size workpiece deformation measurement method, which can efficiently obtain high Accuracy Measurement Results

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  • Method for measuring the deformation of large-sized workpiece

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0022] When measuring the deformation of a certain large-scale workpiece, the first step is to place a fixed point. Paste the coded mark points at fixed positions around the workpiece to be measured (no displacement changes during the deformation process), and serve as a benchmark for the correlation between the later deformation states. The placement of the fixed point should meet the following requirements: the fixed point, as the benchmark for mutual conversion between states, should be placed at a position that does not deform with the workpiece, so as to ensure that the spatial position of the global point does not change during the deformation process. According to different workpiece sizes and shapes, when placing fixed points, there should be no less than 4 fixed points, and all fixed points should not be in the same plane. The enclosing area formed ...

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Abstract

The invention discloses a method for measuring the deformation of a large-sized work-piece, which comprises the following steps of: firstly, placing a fixed point; secondly, sticking a deformation point; thirdly, sampling and shooting a picture; fourthly, rebuilding the information of the deformation point; fifthly, combining the coordinates; sixthly, resetting the ID of the deformation point; and seventhly, calculating the deformation quantity. By the operation steps, the invention can measure the direction and size of the three dimensional deformation of the large-size workpiece, which is caused by the applied force load, thermal load, etc. The method has the characteristics of easy operation, no restriction of the size of the workpiece, abundant measurement information, precise and reliable results, high efficiency and non-contact measurement.

Description

technical field [0001] The invention relates to a measurement method in the field of measurement technology, and further relates to a method for measuring the deformation of a large-size workpiece of 100 mm to 30 m by using an optical photogrammetry method. Background technique [0002] As the requirements for the assembly and use of the workpiece under load are getting higher and higher, the need for measuring the deformation of the workpiece under load and under load is increasing. In engineering deformation measurement, displacement gauges and strain gauges are widely used to measure the displacement and strain of structural members, and the deformation measurement method of using theodolite or total station to measure the displacement and strain of structural members. [0003] A non-contact capacitive compound electrode type displacement sensor and measuring instrument are disclosed in the Chinese invention patent ZL patent number 03102422.X. The main disadvantages are:...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 梁晋郭翔肖振中唐正宗史宝全
Owner XI AN JIAOTONG UNIV
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