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Parameter Identifiability Analysis Method for Aircraft Dynamics System

A technology of system parameters and analysis methods, applied in the field of aircraft system identification, to achieve the effect of improving parameter identification methods, clear thinking, and improving system model structure

Active Publication Date: 2018-05-15
CHINA ACAD OF AEROSPACE AERODYNAMICS
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  • Abstract
  • Description
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Problems solved by technology

Using this method, the problem of judging the identifiability of dynamical system parameters can be solved

Method used

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  • Parameter Identifiability Analysis Method for Aircraft Dynamics System
  • Parameter Identifiability Analysis Method for Aircraft Dynamics System
  • Parameter Identifiability Analysis Method for Aircraft Dynamics System

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Embodiment Construction

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings, so that those skilled in the art can implement it with reference to the description.

[0045] The invention discloses an analysis method for the identifiability of parameters of an aircraft dynamics system, such as figure 1 As shown, the method at least includes the following steps:

[0046] Establish the mathematical model and observation model of the aircraft dynamics system containing the parameter vector to be identified;

[0047] Constructing an information matrix through a flight test and combining the observation model, and calculating the determinant of the information matrix;

[0048] The determinant is compared with the product of all observation errors, and if the determinant is greater than the product of all observation errors, it is judged that the parameter to be identified can be identified; otherwise, it is judged that the parameter to be iden...

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Abstract

The invention provides a method for analyzing the identifiability of aircraft dynamics system parameters, including: establishing a mathematical model and an observation model of the aircraft dynamics system containing a parameter vector to be identified; constructing an information matrix through a flight test combined with the observation model, and calculating the The determinant of the information matrix; the determinant is compared with the product of all observation errors, and if the determinant is greater than the product of all observation errors, the parameter to be identified can be identified; otherwise, the parameter to be identified cannot be identified. The identifiability analysis method of the aircraft dynamics system parameters of the present invention is clear in thought, simple and practical. The present invention analyzes the identifiability of parameters before the test, and provides design basis for flight test test, control input excitation, system identification scheme and the like. At the same time, the invention analyzes the identifiability of the parameters after the test, so as to provide a basis for improving the system model and the identification method.

Description

technical field [0001] The invention belongs to the field of aircraft system identification, in particular to a method for analyzing the identifiability of aircraft dynamic system parameters. Background technique [0002] Identifiability analysis is an important research content of aircraft dynamic system parameter identification, and it is the basis of aircraft flight test test program design and flight test measurement data analysis. Undoubtedly, if the parameters are not identifiable, no matter what identification method is used, it will be futile. It is necessary to improve the experiment and test plan to make the parameters identifiable. Therefore, for the identification of the aircraft dynamics system, the identifiability analysis is an indispensable key step. [0003] The problem of parameter identifiability has attracted the attention of researchers as early as the early 1970s. There are many reasons for the unidentifiability of dynamic system parameters, such as in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/16
Inventor 王贵东
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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