A 3D digital speckle modeling method for damaged aeroengine blades
An aero-engine, three-dimensional digital technology, applied in image data processing, instruments, analysis materials, etc., can solve problems such as low measurement accuracy and limited practicability, and achieve the effect of reducing repair costs, reducing maintenance costs, and shortening the repair cycle
Active Publication Date: 2018-11-02
CIVIL AVIATION UNIV OF CHINA
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Problems solved by technology
The optical projection measurement method is more affected by objective factors and has low measurement accuracy, which is suitable for the detection of the semi-finished blade surface; the laser used in the structured light method is easily reflected by the mirror surface of the polished blade. The method must paste a certain number of coded mark points on the outside of the tested blade, which limits the practicability of the method
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[0036] The three-dimensional digital speckle modeling method for the damaged blade of an aero-engine provided by the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0037] Such as figure 1 , figure 2 As shown, the three-dimensional digital speckle modeling method for aero-engine damaged blades provided by the present invention includes the following steps in order:
[0038] Step 1) Establish a three-dimensional digital speckle measurement system for aeroengine damaged blades: the system includes a measurement turntable 1, two cameras 2, a synchronous strobe control device 3 and a computer 4; wherein: the measurement turntable 1 is for placing the measured The controllable rotating platform of the speckle damage blade 5; the camera 2 is an image acquisition device including an illumination light source and a camera, and the two cameras 2 are respectively placed on both sides of the measurement turnt...
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The invention relates to an aeroengine damaged blade three-dimensional digital speckle moulding method. The aeroengine damaged blade three-dimensional digital speckle moulding method comprises steps of establishing an aeroengine damaged blade three-dimensional digital speckle measuring system, calibrating a binocular camera, making speckles, measuring partitions, rotating a speckle damaged blade to be detected and acquiring images, matching cognominal speckles, solving three dimensional coordinates of spatial speckles in each partition coordinate system, solving three dimensional coordinates of spatial speckles in a global coordinate system, carrying out three dimensional coordinate surface fitting, and carrying out three dimensional digital modeling and the like. According to the invention, three dimensional morphology features of the damaged blade can be measured in a high-precision, high-efficiency and full-field non-contact manner, and a three dimensional model is constructed. The significance of the aeroengine damaged blade three-dimensional digital speckle moulding method is that the moulded damaged blade is compared with a standard blade in size parameters, then the damaged blade is restored by means of a digital remanufacturing technology, and therefore the repairing period can be shortened, the repairing cost can be reduced, and the engine maintenance cost can be reduced.
Description
technical field [0001] The invention belongs to the technical field of binocular vision three-dimensional digital speckle measurement, and in particular relates to a three-dimensional digital speckle modeling method for damaged blades of aeroengines. Background technique [0002] With the rapid development of my country's civil aviation transportation industry, more and more attention has been paid to the safety of aircraft navigation. Statistics show that as the core component of the aircraft, the blades of the aero-engine are prone to damage after working for a long time in the harsh environment of high temperature and high pressure, which in turn affects the performance of the engine, thus burying hidden dangers to flight safety. [0003] The related domestic aviation machinery manufacturing equipment industry started late, and the blades, which are the core parts of the engine, are generally sent abroad for repair after damage, so the cost is high and time-consuming, res...
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IPC IPC(8): G01B11/00G01N21/88G06T17/10
CPCG01B11/002G01N21/88G01N21/8851G01N2021/8883G01N2021/8887G06T17/10
Inventor 吴军王志军马凯于之靖王涛程彬彬王科平王嘉伟
Owner CIVIL AVIATION UNIV OF CHINA