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Innovative wind tunnel balance calibration data processing method

A technology of wind tunnel balance and calibration data, which is applied in the field of aerospace aerodynamic wind tunnel test, can solve the problems of error, influence the accuracy and reliability of the formula matrix of the wind tunnel balance, etc., and achieve the effect of ensuring the prediction ability.

Active Publication Date: 2022-07-08
AVIC SHENYANG AERODYNAMICS RES INST
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Problems solved by technology

[0005] However, in the wind tunnel balance formula matrix obtained by calibration and fitting, each coefficient value itself must have an error, and there may also be an approximate linear correlation between the calibration load combination (independent variable), and the coefficient term containing the error and approximately linearly related calibration load combinations (independent variables) are bound to affect the overall accuracy and reliability of the wind tunnel balance formula matrix

Method used

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  • Innovative wind tunnel balance calibration data processing method
  • Innovative wind tunnel balance calibration data processing method
  • Innovative wind tunnel balance calibration data processing method

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Embodiment 1

[0064] The first embodiment of the present application provides an innovative wind tunnel balance calibration data processing method, including:

[0065] Step 1: According to the characteristics of the wind tunnel balance, select the calibration load combination (independent variable) group included in the formula matrix of the wind tunnel balance, and set the coefficient value of the unselected calibration load combination (independent variable) to 0, so as to determine the wind tunnel balance. The maximum allowable formula of each component, the maximum formula of each component of the wind tunnel balance can be:

[0066]

[0067]

[0068] where n is the number of components of the wind tunnel balance, x, y and z are the indices of each component of the wind tunnel balance, is the voltage output value of a certain component when the wind tunnel balance is loaded, and is the calibration load applied to each component of the wind tunnel balance, is the intercept t...

Embodiment 2

[0096] The difference between the second embodiment of the present application and the first embodiment is that the single-block material processing diameter 32 rod type wind tunnel balance used in the specific embodiment is as follows: figure 2 shown. The balance is used to measure the normal force y, the pitching moment Mz, the rolling moment Mx, the axial force X, the lateral force Z and the yaw moment My, with a total of six components, respectively denoted by F 1 , F 2 , F 3 , F 4 , F 5 and F 6 logo.

[0097] 24 strain gauges are pasted on the balance body, and the strain gauges 1~4 form a Wheatstone bridge R 1 , corresponding to the measurement load F 1 ; Strain gauges 5~8 form a Wheatstone bridge R 2 , corresponding to the measurement load F 2 ; Strain gauges 9~12 form a Wheatstone bridge R 3 , corresponding to the measurement load F 3 ; Strain gauges 13~16 form a Wheatstone bridge R 4 , corresponding to the measurement load F 4 ; Strain gauges 17~20 form ...

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Abstract

The invention discloses an innovative wind tunnel balance calibration data processing method, and belongs to the technical field of aviation weather dynamic wind tunnel tests. The defect that in the prior art, a judgment method for carrying out technical evaluation on errors of various coefficient values in a wind tunnel balance formula matrix and approximate linear correlation between calibration load combinations and discriminating elimination or reservation is lacked is overcome. The method comprises the steps of firstly determining a maximum allowable formula of each component of the wind tunnel balance; secondly, for each component of the wind tunnel balance, determining and fitting to generate a wind tunnel balance candidate formula containing different numbers of coefficient items by setting an assessment threshold value representing that a coefficient value has a relatively large error and calibration load combinations have approximate linear correlation; obtaining a recommendation formula of each component of the wind tunnel balance; and finally, combining the recommendation formula of each component of the wind tunnel balance to obtain a recommendation formula matrix capable of accurately describing the characteristics of the wind tunnel balance so as to ensure the accuracy of the force measurement wind tunnel test data.

Description

technical field [0001] The application relates to a method for processing wind tunnel balance calibration data, in particular to an innovative method for processing wind tunnel balance calibration data, and belongs to the technical field of aerospace aerodynamic wind tunnel tests. Background technique [0002] The dynamometric wind tunnel test is the most basic test item in the process of aerodynamic research and aircraft development. In the dynamometric wind tunnel test, the wind tunnel directly measures the magnitude, direction and action point of the aerodynamic loads (three forces and three moments) acting on the scaled model of the aircraft. The precision of the balance visible in the wind tunnel is directly determined by the balance. The accuracy of the dynamometric wind tunnel test data. However, when the wind tunnel balance completes the design, processing, strain gage pasting and other processes, it is equivalent to a "black box" and belongs to an unknown system. T...

Claims

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Application Information

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IPC IPC(8): G06F17/11G06K9/62G06Q10/04G06Q10/06G01M9/02B64F5/60G06F30/15
CPCG06F17/11G06Q10/04G06Q10/06393G01M9/02B64F5/60G06F30/15G06F18/22Y02T90/00
Inventor 李小刚张巨达王晨
Owner AVIC SHENYANG AERODYNAMICS RES INST
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