Paddle torsion angle real-time monitoring method based on mark point detection

A technology of marking points and torsion angles, which is applied in the field of real-time monitoring of blade torsion angles, can solve the problems of low measurement accuracy, inability to measure in real time, complicated operation, etc., and achieve the effect of precise positioning, fast speed and simple operation

Inactive Publication Date: 2020-03-13
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0004] In order to solve the problems of complex operation, incapable of real-time measurement, and low measurement accuracy in existing blade torsion angle measurement methods, the present invention provides a blade torsion angle measurement method based on marker point detection

Method used

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  • Paddle torsion angle real-time monitoring method based on mark point detection
  • Paddle torsion angle real-time monitoring method based on mark point detection
  • Paddle torsion angle real-time monitoring method based on mark point detection

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] In the following embodiment, a piece of angle steel is set on the helicopter blade so as to set two circular marking points; and an industrial camera (the resolution is 1280×1024, the frame rate is 1280×1024, the frame rate is 169f / s), the model of Nice company is MF-2000 high-frequency photographic light, multiplier trigger, angle sensor, and computer to form a computer vision system. Place the camera at a position 3000mm away from the angle steel, and place it directly against the angle steel. In addition, a high-frequency photography light is placed next to the camera to increase the amount of light entering the camera when shooting, so that the camera can capture clear images under low exposure conditions. When the blade is stationary, stick a square reflective sticker on a blade, and align the infrared sensor with the reflective sti...

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Abstract

The invention discloses a paddle torsion angle real-time monitoring method based on mark point detection. The method comprises the following steps: firstly, separating a foreground from a background by utilizing an Otsu threshold algorithm to obtain a binary image with a connected domain; secondly, matching out circular mark points by adopting a minimum circumcircle method to realize coarse positioning of the circular mark points; thirdly, removing singular points through a circle fitting method to improve the circle center positioning precision of the mark points and achieve fine positioningof the circular mark points; and finally, calculating an included angle between straight lines formed by the circle centers of the mark points obtained twice to obtain a torsion angle. The method hasthe advantages of simplicity in operation, high precision, high speed and no contact, and is particularly suitable for real-time monitoring of the torsion angle of a paddle in a high-speed motion state.

Description

technical field [0001] The invention relates to the technical field of image measurement, in particular to a method for real-time monitoring of the torsion angle of a blade. Background technique [0002] Helicopter is a rotorcraft that uses the power plant to drive the rotor as the main source of lift and propulsion, and can take off and land vertically and fly back and forth, left and right. With the continuous development of helicopter scientific research and technology in modern my country, helicopters are widely used in border patrols, maritime rescue, oil drilling, disaster relief, forest fire prevention, medical assistance, film and television shooting and other fields. The torsion angle is one of the important flight parameters of the helicopter, which is directly related to the safety, comfort, reliability and accuracy of the weapon system of the helicopter. Therefore, the rapid and accurate measurement of the torsion angle of the blade has important research signifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/26
CPCG01B11/26
Inventor 熊邦书熊宝欧巧凤余磊雷鸰
Owner NANCHANG HANGKONG UNIVERSITY
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