An aircraft model ice shape contour extraction method based on machine vision

An aircraft model and machine vision technology, applied in the field of data processing, can solve problems such as error, inapplicability of large-scale icing wind tunnel model icing test, error without further analysis, etc., to achieve accurate measurement effect

Inactive Publication Date: 2019-03-29
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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Problems solved by technology

Although this method can realize the ice shape measurement, but the ice shape and the airfoil are extracted separately and then combined, there will be certain errors; and it is not suitable for large-

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  • An aircraft model ice shape contour extraction method based on machine vision
  • An aircraft model ice shape contour extraction method based on machine vision
  • An aircraft model ice shape contour extraction method based on machine vision

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Embodiment Construction

[0031] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0032] The aircraft icing test environment is a 3m×2m icing wind tunnel. The basic test process includes four parts: model installation, spray icing, "hot knife" cutting ice shape and drawing ice shape trajectory. The ice shape traces of the icing test results were obtained by the ice shape measuring device and drawn manually by the test personnel. The ice shape measurement device is mainly composed of "hot knife", plexiglass cardboard, bracket and graph paper. The "hot knife" is mainly used for cutting ice shapes, its inner contour is the same as the outer contour of the model section, and can envelop the leading edge of the airfoil to the maximum thickness area. The "hot knife" is composed of a 3mm thick copper plate and a handle. The handle is made of heat-insulating material, which can pr...

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Abstract

The invention discloses an aircraft model ice shape contour extraction method based on machine vision, The method can recognize the ice contour collected from the icing test of the aircraft model in the icing wind tunnel. The experiment proves that the method has high robustness. The ice contour recognition and curve extraction are realized on 1000 ice contour images, and the digital result of icecontour curve is obtained. The digitized results of ice shape curves are not only helpful to analyze the geometric characteristics of ice shapes produced under different cloud and fog conditions in two-dimensional wind tunnels, but also of great significance to the further study of aircraft icing flight, ice protection and ice airworthiness evidence.

Description

technical field [0001] The invention relates to the field of data processing, in particular to a method for extracting ice contours of an aircraft model in an icing wind tunnel based on machine vision. Background technique [0002] During the flight of the aircraft, water droplets in the clouds will condense at a certain height. When the temperature is 0 degrees Celsius (0°C) or below, the surface of the aircraft will freeze and may further form ice accumulation. Ice accumulates on every exposed front surface of the plane, not just the wings, propellers and windshield, but also the antennas, vents, intakes and cowls. Aircraft icing increases the overall mass of the aircraft, changes the shape of the fuselage, and further affects the smooth flow of air, increases resistance, and destroys the aerodynamic shape of the wings, which has immeasurable harm to flight. Therefore, the study of aircraft icing is an important topic in aerodynamics, and the most common and efficient met...

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Application Information

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IPC IPC(8): G06T7/13G06T7/136G06T7/11G06T7/155
CPCG06T7/11G06T7/13G06T7/136G06T7/155
Inventor 秦三春李强王梓旭王文光赖庆仁柳庆林张平涛刘蓓
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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