Two-dimensional wind speed and direction test method through visual identification based on reflecting silk thread attitude angle

A test method and technology of wind speed and direction, applied in the direction of fluid velocity measurement, velocity/acceleration/impact measurement, measurement device, etc., can solve the problem of slow response speed, achieve fast response speed, overcome susceptibility to electromagnetic waves, and have no mechanical wear. Effect

Inactive Publication Date: 2017-03-08
CENT SOUTH UNIV +1
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Problems solved by technology

[0006] The instruments commonly used in mechanical wind measurement technology are conventional wind cups or rotor-type anemometers. Mechanical measurement requires starting wind speed and slow response speed, which is suitable for occasions with low precision requirements.

Method used

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  • Two-dimensional wind speed and direction test method through visual identification based on reflecting silk thread attitude angle
  • Two-dimensional wind speed and direction test method through visual identification based on reflecting silk thread attitude angle
  • Two-dimensional wind speed and direction test method through visual identification based on reflecting silk thread attitude angle

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Embodiment Construction

[0034] The method includes two parts: wind tunnel calibration and actual measurement in the specific implementation process:

[0035] 1) Some steps of wind tunnel calibration include:

[0036] (A) The position of the CCD area array camera and the reflective wire is fixed. When the suspended reflective wire is stationary, it is vertically downward. The CCD area array camera is installed directly below the reflective wire. ;

[0037] (B). Put the CCD area array camera and reflective wire in the above steps into the wind tunnel for calibration, adjust the wind speed in the wind tunnel, and take the stored reflective wire images through the CCD area array camera to obtain multiple groups of reflections at different wind speeds Effective projected length data of the wire;

[0038] Among them, CCD area array camera imaging: the image collected by the camera is converted into a digital image by a high-speed image acquisition system in the form of a standard TV signal, and input to ...

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Abstract

The invention discloses a two-dimensional wind speed and direction test method through visual identification based on reflecting silk thread attitude angle, the innovation of the method is that related knowledge of machine vision and hydromechanics are combined, a reflecting silk thread which is a solid control model is used for transmitting visual information, according to visual information acquired by a CCD area-array camera, non- contact measurement is performed on the position and the attitude of the silk thread, a relation between spatial position variation and fluid velocity of the solid control model is established through mapping of two-dimensional image and three-dimensional Cartesian space information and a visual measurement system, so that the wind speed and direction can be indirectly measured through visual identification.

Description

technical field [0001] The invention relates to a method for visually recognizing two-dimensional wind speed and direction based on the attitude angle of reflective silk thread, and the method can be specifically applied to the measurement of low wind speed and direction in engineering technology. Background technique [0002] As an important part of the field of engineering technology measurement, the measurement of wind speed is self-evident in the importance of engineering experiments in aerodynamics and aerodynamics, and also plays a vital role in the study of train aerodynamics. At present, the testing methods for air velocity mainly include hot wire testing technology, ultrasonic testing technology, differential pressure testing technology, mechanical wind measuring technology, etc. [0003] The hot wire probe used in the hot wire anemometer is very thin and is at high temperature, so it is easy to be damaged. In addition, due to the deformation and oxidation of the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/26G01P13/02
CPCG01P5/26G01P13/02
Inventor 周伟丁叁叁梁习锋田爱琴熊小慧唐明赞
Owner CENT SOUTH UNIV
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