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A Method of Indirectly Determining the Splash Angle of an Aircraft Using Optical Measurement Parameters

A technology of splashing water and parameters, applied in the direction of measuring devices, optical devices, instruments, etc., can solve problems such as difficulty in guaranteeing camera effects, hidden dangers of flight safety, impact on flight safety, etc., to avoid test safety problems and accuracy of calculation results problem effect

Active Publication Date: 2021-08-03
CHINESE FLIGHT TEST ESTAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most direct way to obtain a front view is to set up a camera directly in front of the aircraft to take pictures. Due to the distance, it is difficult to guarantee the camera effect. In addition, the front view will bring hidden dangers to flight safety.
If aerial photography is used to obtain the angle, on the one hand, only an approximate positive angle of view can be obtained, and on the other hand, it will also affect flight safety

Method used

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  • A Method of Indirectly Determining the Splash Angle of an Aircraft Using Optical Measurement Parameters
  • A Method of Indirectly Determining the Splash Angle of an Aircraft Using Optical Measurement Parameters
  • A Method of Indirectly Determining the Splash Angle of an Aircraft Using Optical Measurement Parameters

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Embodiment Construction

[0031] 1) Determination of the rotation angle ε of the coordinate system

[0032] The selection of the rotation angle ε depends on the actual situation. In order to ensure the image clarity and imaging quality, the front camera C3 should not be too far away, and the longest distance should not exceed 500m, and the arrangement of the camera should not affect the normal test. For example, the distance between cameras A1 and B2 should not be less than 50m from the center line of the runway, such as figure 1 shown. In order to ensure the imaging quality of the three cameras at the same time, it is advisable to select the maximum value of the rotation angle ε as 3° to 5°, as figure 2 shown.

[0033] 2) Determination of the intersection point O of the connection line between cameras A1 and B2 and the vertical line of camera C3

[0034] In order to ensure that a fully developed splash trajectory can be obtained, the determination of the intersection point O should be selected as ...

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Abstract

The invention belongs to the experimental testing technology, and in particular relates to a method for indirectly determining the splashing angle of an aircraft by means of optical measurement parameters. The present invention provides a method for optically determining the splash trajectory angle based on coordinate transformation, which specifically includes step 1: establishing the geometric relationship between the original coordinate system and the converted new coordinate system; Arrange cameras on both sides as required; Step 3: Carry out a water splash test, and use the optical camera to calculate the front and side angles of the splash trajectory in the new coordinate system; Step 4: Use the coordinate system relationship established in Step 1 to indirectly calculate Obtain the front view angle and side view angle of the splashing water trajectory in the original coordinates. The invention proposes a new testing method for solving the problem of obtaining the splashing track in the splashing test of the original complete machine.

Description

technical field [0001] The invention is applied to the water splashing test of the whole machine, indirectly determines the water splashing angle of the aircraft by means of the optical measurement results, and provides a basis for judging the test results. Background technique [0002] The splash water test of the whole aircraft is a test subject stipulated in the research and development and certification of civil aircraft and the identification and finalization of military aircraft. After the test, it is necessary to provide the characteristic angles of splash water of the whole machine, including the front view angle and side view angle of the splash water trajectory. The splash angle obtained by the test can be compared with the design calculation value to check the prediction method. [0003] Determining the splash angle is usually carried out using optical measurement methods. The most direct way to obtain a front view is to set up a camera directly in front of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/26
Inventor 高扬杜毅洁潘鹏飞申晓霞李飞行
Owner CHINESE FLIGHT TEST ESTAB