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Aircraft modeling method based on maximum information content-credibility criterion of variable metrical data

A technology with the largest amount of information and modeling methods, applied in the field of aircraft modeling, can solve problems such as poor accuracy of aerodynamic models and parameter verification

Inactive Publication Date: 2014-11-26
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0003] In order to overcome the deficiency that the maximum information content criterion when the observation vectors of different flight tests are different leads to poor correctness of the aerodynamic model and parameter verification given by the flight test, the present invention provides a maximum information content-credibility criterion based on variable measurement numbers aircraft modeling method

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  • Aircraft modeling method based on maximum information content-credibility criterion of variable metrical data
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  • Aircraft modeling method based on maximum information content-credibility criterion of variable metrical data

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Embodiment Construction

[0049] The specific steps of the aircraft modeling method based on the variable measurement number maximum information amount-credibility criterion of the present invention are as follows:

[0050] 1. The commonly used candidate model forms for many aircraft when the angle of attack is less than 60 degrees are:

[0051] x · ( t ) = Φ ( Ω 0 ) f 0 [ x ( t ) ] + θ 1 f 1 [ x ( t ) ] + . . . + ...

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Abstract

The invention discloses an aircraft modeling method based on a maximum information content-credibility criterion of variable metrical data, which is used for solving the technical problem of poor accuracy of parameter calibration of aerodynamic models provided by flight tests caused by the maximum information content criterion when the observation vectors of the conventional different flight tests are different. According to the technical scheme, the method comprises the following steps of: analyzing the influence of the difference of the observation vectors on the maximum information content criterion during modeling and model validation of an aircraft, and introducing a credibility parameter to obtain a criterion on modeling rectification and model verification according to different flight test factors of the aircraft; and decomposing U-D of measured variance estimation Rj and Rj+1 to obtain a scalar model selection and verification discriminant. The method provided by the invention is convenient for directly establishing aerodynamic and moment models of the aircraft according to flight test data, and avoids the technical problem that the aerodynamic model is incorrectly established and verified by different flight test data due to that the different observations are not directly considered in the maximum information content criterion.

Description

technical field [0001] The invention relates to an aircraft modeling method, in particular to an aircraft modeling method based on the variable measurement number maximum information amount-credibility criterion. Background technique [0002] According to the aircraft aerodynamic model and parameters, it can not only determine the handling stability of the aircraft, but also provide the correct mathematical model for ground and air simulators; verify the wind tunnel experiments and theoretical calculation results of aircraft aerodynamic parameters; provide support for the design and improvement of aircraft control systems Provide basic data; identify the flight quality of finalized aircraft; study the flight quality of high-performance aircraft; conduct accident analysis of aircraft crashes, etc.; the problem of accurately establishing a mathematical model of an aircraft is completely different from the theoretical method of modeling through basic laws, theorems, etc. , the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B17/02
Inventor 史忠科
Owner NORTHWESTERN POLYTECHNICAL UNIV
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