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A data processing method for ground effect wind tunnel test

A wind tunnel test and ground effect technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of poor curve smoothness, interference, small interference factors, etc., and achieve simple and fast data correction Data correction, the effect of improving stability

Active Publication Date: 2016-08-03
CHINA ACAD OF AEROSPACE AERODYNAMICS
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AI Technical Summary

Problems solved by technology

Routine tests (excluding ground effects) have mature technology, small interference factors and are easy to eliminate. Generally, smooth curves with high precision can be obtained; however, after adding ground boundary conditions, due to the limitation of test technology, the relative motion between the floor and the flight cannot be truly simulated. and boundary layer conditions, so the interference is more serious in the test, and the obtained There are often singular points in the curve and the smoothness of the curve is not good (distortion), which will seriously affect The accuracy of the solution causes large fluctuations in the "flying high focus" curve, making it impossible to accurately evaluate near-earth stability

Method used

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  • A data processing method for ground effect wind tunnel test
  • A data processing method for ground effect wind tunnel test
  • A data processing method for ground effect wind tunnel test

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Embodiment Construction

[0041] Specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0042] Such as figure 1 Shown, a kind of ground effect wind tunnel test data processing method, the present invention is that the data that contains disturbance that test obtains is carried out fitting process, obtains the curve that the law that changes is smooth based on test data, for follow-up stability analysis and Control rate design provides favorable conditions. The present invention comprises steps as follows:

[0043] (1) Obtain ground effect wind tunnel test data and transform it into a data format related to height where m Z is the pitching moment coefficient, is the height coefficient;

[0044] (2) Arrange and combine the transformed test data in step (1) to form multiple sets of data combinations, each of which contains 3 test data points;

[0045] (3) Substituting the test data points in each group of data combin...

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Abstract

A ground effect wind tunnel test data processing method, the present invention uses the data correction formula applicable to the ground effect and the coefficient regression solution calculation method to quickly and objectively correct the wind tunnel test data with interference; the method will test Bring the data into the correction formula to find the coefficients in the formula, use the regression algorithm to find a set of coefficients with the highest correlation with the original data as the coefficients of the correction formula, and then use the determined formula to calculate the data that is the same as the state of the test point. The results of this method show that the corrected data has a high degree of restoration, and can provide regular basic data for post-processing and analysis of data, and create good conditions for the shape selection and fine design of ground-effect aircraft.

Description

technical field [0001] The invention relates to a post-processing method for ground-effect wind tunnel test data, which is used for analyzing the near-ground stability of ground-effect aircraft and belongs to the technical field of aircraft testing and testing. Background technique [0002] The general ground effect test is to study the aerodynamic characteristics of the aircraft at different heights from the ground, so its aerodynamic data variable parameter has an additional height variable h compared with the conventional aircraft. Declination test, test data except conventional c L ~α, m z ~α also includes The above data are used to calculate the "angle of attack focus" and "fly height focus". By definition, [0003] Angle of attack focus: X fα ‾ = X t ‾ - m Z α ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 杨辉李锋刘明霞李志国
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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