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Aircraft dynamics system parameter identifiability analitical method

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

Active Publication Date: 2015-03-25
CHINA ACAD OF AEROSPACE AERODYNAMICS
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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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  • Aircraft dynamics system parameter identifiability analitical method
  • Aircraft dynamics system parameter identifiability analitical method
  • Aircraft dynamics system parameter identifiability analitical method

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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 discloses an aircraft dynamics system parameters identifiability analytical method. The method includes building an aircraft dynamics system mathematical model and observation model with parameter vectors to be identified; building an information matrix through flight tests and combining the observation model, and calculating a determinant of the information matrix; and comparing the determinant with all product of observation error, if the determinant is greater than the all product of observation error, the parameters can be identified; if not, the parameters can not be identified. The aircraft dynamics system parameters identifiability analytical method has the advantages of being clear in thinking, simple and practical. The aircraft dynamics system parameters identifiability analytical method analyzes the parameters' identifiability before tests, which provides design basis for flight tests, control input simulation, system identification scheme and the like. Meanwhile, by analyzing parameters' identifiability after tests, basis for improving system model and identification method is provided.

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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IPC IPC(8): G06F17/16
Inventor 王贵东
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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