Method and device for measuring attitude of parachute in wind tunnel test and medium

Abstract

The invention discloses a method and device for measuring the attitude of a parachute in a wind tunnel test and a medium, and relates to the technical field of low-speed wind tunnel tests. Based on a motion capture system, the lower end of the parachute is fixed to a preset fixing point on a branch, and the branch is fixed to the center line of the wind tunnel ground; establishing a three-dimensional space coordinate system of the motion capture system by using a first camera arranged outside an observation window on the side wall of the wind tunnel; a second camera arranged in the wind tunnel is used for shooting the motion trail of a mark point at the top end of the parachute when the parachute moves to obtain a motion trail image of the mark point; and determining position information of the mark point in the three-dimensional space coordinate system according to the motion track image and the three-dimensional space coordinate system, and determining the attitude of the parachute according to the position information. According to the method, a sensor is omitted, a non-contact measurement method is used, the weight of the parachute is not changed basically, the precision of the motion capture system can reach the millimeter level, and the accuracy of parachute attitude measurement is guaranteed.

Description

technical field [0001] The present application relates to the technical field of low-speed wind tunnel tests, and in particular, to a method, device and medium for attitude measurement of parachutes in wind tunnel tests. Background technique [0002] The wind tunnel test of the parachute is an effective means to obtain its aerodynamic parameters. The parachute wind tunnel test uses a single branch to connect the lower end of the parachute. The parachute will swing back and forth in the wind tunnel. The posture of the parachute in the wind tunnel test includes: Pitch and sideslip angles. [0003] The traditional method of measuring the test model in the wind tunnel test is to set up sensors (eg: angle of attack sensor), level, gyroscope and other equipment on the test model to measure the attitude of the test model in the wind tunnel test. Because the parachute is very light and soft, Setting these devices in the parachute will change the weight of the parachute itself, maki...

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Problems solved by technology

[0003] The traditional method of measuring the test model in the wind tunnel test is to set sensors (for example: angle of attack sensor), level gauge, gyroscope and other equipment on the test model to measure the attitude of the test model in the wind tunnel test. Since the parachute is very light and soft, Setting these devices in the parachute will change the weight of the parachute itself, making the measured attitude of the parachute inaccurate, so these devices are not suitable for measuring the attitude of the parachute in the wind tunnel test

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