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Three-dimensional full-field deformation measurement method of paddle

A measurement method and blade technology, which is applied in the field of helicopter testing, can solve the problems of single function, small measurement scale, and inability to detect the motion parameters of large helicopter rotating blades, and achieve the effect of comprehensive measurement data and high measurement accuracy

Inactive Publication Date: 2016-09-28
XI AN JIAOTONG UNIV
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  • Application Information

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Problems solved by technology

The existing image processing-based detection methods for helicopter rotating blades have the disadvantages of small measurement scale and single function, and cannot realize the detection of full-field deformation and motion parameters of large helicopter rotating blades.

Method used

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  • Three-dimensional full-field deformation measurement method of paddle
  • Three-dimensional full-field deformation measurement method of paddle
  • Three-dimensional full-field deformation measurement method of paddle

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing and specific embodiment the present invention is further described:

[0023] In one embodiment, the present invention provides a three-dimensional full-field deformation measurement method of a blade;

[0024] The method comprises the steps of:

[0025] S100, making electronic speckle, spraying or projecting a speckle pattern onto the surface of the blade, and pasting coded mark points on the surface of the blade;

[0026] S200. Place the camera group so that its measurement range covers the root, middle and tip of the blade, install sensors at the hub of the blade, and install acquisition cards, control circuits and lighting facilities around the camera group;

[0027] S300. Calibrate the internal and external parameters of the camera group by using a calibration plate with coded marker points;

[0028] S400, using the camera group in step S200 to collect images of speckle and coded marker points on the surface of the bl...

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Abstract

The invention discloses a three-dimensional full-field deformation measurement method of a paddle. The method comprises the following steps of 1), designing and manufacturing an electronic speckle; 2), forming a camera set by means of multiple three-dimensional video units; 3) calibrating the inner diameter and the outer diameter of the camera set by means of a calibrating board with a coding mark point; 4) acquiring an image, realizing image grouping, and performing imaging matching on the grouped image; 5), performing three-dimensional analysis on the image which is matched in the step 4) by means of the inner parameter and the outer parameter of the camera set obtained in the step 3), and obtaining a three-dimensional point cloud of each paddle surface; and 6) based on the three-dimensional point cloud of each paddle surface obtained in the step 5), fitting the profile of the paddle, and obtaining three-dimensional full-field deformation of the paddle. The three-dimensional full-field deformation measurement method can be used for measuring anisotropic three-dimensional full-field dynamic deformation of the paddle and furthermore can be used for obtaining various movement parameters of the paddle. The three-dimensional full-field deformation measurement method has advantages of comprehensive measured data, high measurement accuracy, effective settlement for interference in complicated working conditions, and reliable data in paddle movement process.

Description

technical field [0001] The invention belongs to the technical field of helicopter tests, in particular to a method for measuring three-dimensional full-field deformation of a blade. Background technique [0002] The large rotating blades of helicopters have a large aspect ratio and are connected by hubs, bearings and other components to provide the required lift, propulsion and operating force for the helicopter, with extremely complex aerodynamics, dynamics and their mutual coupling This problem has a significant impact on aerodynamics and flight safety. [0003] Due to the relatively large theoretical and technical errors in blade motion measurement, various contact and non-contact measurement methods have emerged at home and abroad. Traditional contact blade measurement methods, such as strain gauges, fiber optic sensors, laser measurement, photoelectric measurement, etc., have the disadvantages of single function, few measurement points, limited data, and large theoreti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16G01C11/00G06F17/50G06T7/00G06T17/00
CPCG06T17/00G01B11/16G01C11/00G06T2200/08G06T2207/10004G06F30/17G06F30/20
Inventor 梁晋龚春园温广瑞魏斌王晓光尤威
Owner XI AN JIAOTONG UNIV
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