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Aircraft modeling method based on variable data length maximum information criterion

A technology with the maximum amount of information and data length, applied in the field of aircraft modeling, it can solve the problems of poor accuracy of aerodynamic model and parameter verification, regardless of data length, etc.

Inactive Publication Date: 2015-03-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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Problems solved by technology

[0003] In order to overcome the deficiency that the existing maximum information content criterion does not consider the data length, which leads to the poor correctness of the aerodynamic model and parameter verification given by the flight test, the present invention provides a method for making the aircraft model more accurate by using the variable data length maximum information content criterion

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  • Aircraft modeling method based on variable data length maximum information criterion
  • Aircraft modeling method based on variable data length maximum information criterion
  • Aircraft modeling method based on variable data length maximum information criterion

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Embodiment Construction

[0038] The present invention utilizes variable data length maximum information criterion to make aircraft model more accurate method specific steps as follows:

[0039] 1. The commonly used candidate model forms for many aircraft when the angle of attack is less than 60 degrees are:

[0040] x · ( t ) = Φ ( Ω 0 ) f 0 [ x ( t ) ] + θ 1 f 1 [ x ( t ) ] + . . . + θ q f q [ x ( t ...

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Abstract

The invention discloses an aircraft modeling method based on a variable data length maximum information criterion. The technical problems that the proving correctness of aerodynamic models and parameters verified by a flight test is poor caused by the fact that data lengths are not considered in a prior maximum information criterion are solved. The technical scheme includes that data lengths are considered in the maximum information criterion, a modeling criterion is corrected in accordance with various flight test factors of an aircraft, the division of U-D of Rj and Rj+1 is evaluated for the measurement variance, and a scalar model selection and verified discriminant is obtained. The method has the advantages that aerodynamic models and moment models of the aircraft can be established directly in accordance with flight test data, and the technical problem that aerodynamic models established and verified by different flight test data are not correct caused by the fact that data lengths are not considered in the prior maximum information criterion directly is solved.

Description

technical field [0001] The invention relates to an aircraft modeling method, in particular to a method for making the aircraft model more accurate by utilizing the variable data length maximum information quantity 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, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04G05D1/00
Inventor 史忠科
Owner NORTHWESTERN POLYTECHNICAL UNIV
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