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A Method for Determining Aircraft Motion Modes Using Time-Domain Aerodynamic Equivalent

A motion mode, aircraft technology, applied in the field of data processing, can solve the problem of not meeting the low-order equivalent system required for test flight, and achieve the effects of accurate and reliable results, unique identification results, and guaranteed identifiability

Active Publication Date: 2010-03-10
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dynamic modal aerodynamic coefficient method cannot meet the needs of the controlled aircraft motion modal flight test and the low-order equivalent system of the controlled aircraft motion modal

Method used

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  • A Method for Determining Aircraft Motion Modes Using Time-Domain Aerodynamic Equivalent
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  • A Method for Determining Aircraft Motion Modes Using Time-Domain Aerodynamic Equivalent

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Experimental program
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Embodiment Construction

[0174] The establishment of the time-domain aerodynamic equivalent fitting model of the longitudinal short-period motion of the aircraft. For uncontrolled aircraft, its longitudinal short circumference

[0176] where τz, τα, τq are time delays. Taking a linear approximation, we get

[0177]

[0178] Because the time delay is small, it is desirable

[0179]

[0181]

[0183] At aircraft normal overload (center of gravity)

[0184]

[0186]

[0187] g is the acceleration due to gravity. Then the observation equation is taken as

[0188]

[0194]

[0197]

[0198]

[0199] The establishment of the time-domain aerodynamic equivalent fitting model of small disturbances in the lateral direction of the aircraft. Lateral movement of controlled aircraft

[0200]

[0202]

[0204]

[0206]

[0208]

[0210]

[0212]

[0213] θ

[0214]

[0216]

[0218]

[0220] pm=p+p0,

[0221] rm=r+r0,

[0222] φm=φ+φ0

[0224] Enter the equation:

[0225] Equation of state:

[0229]

[0231] Enter th...

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Abstract

The invention provides a flight test method for determining the motion mode of an aircraft by using the time-domain aerodynamic equivalent. It is aimed at several defects of the traditional low-order equivalent system proposed flight test method. Taking the aircraft to fly straight and level at a constant speed as the reference motion, the aircraft is stimulated by the longitudinal small disturbance motion, and the motion parameters of the aircraft obtained by the measurement are measured. The values ​​are the input value and the observed value, and the aerodynamic equivalent fitting model of the longitudinal short-period motion of the aircraft is used. The Bayesian estimation iterative algorithm is used as the parameter identification algorithm to fit the observed data to obtain the short-period motion modal parameters and etc. time-domain aerodynamic equivalent identification model of the aircraft’s lateral-direction small-disturbance motion as the fitting model for the combined motion of the aircraft’s lateral-direction Dutch roll and roll, using Bayeux The iterative algorithm for the estimation of the Sri Lankan is a parameter identification algorithm, and the observation data are fitted to obtain the Dutch roll motion modal parameters, the roll motion modal parameters and the equivalent time delay.

Description

Method for determining aircraft motion mode by time-domain aerodynamic equivalence Technical field The present invention relates to the technology and the technical method of flight data processing of controlled aircraft motion mode test flight, especially with The flight data is combined with the time-domain aerodynamic equivalent model of the aircraft to determine the aircraft using the flight control system (referred to as the control system). Aircraft, the same below) test flight technology of motion mode and technical method of data processing. technical background The task of aircraft motion mode test flight is exactly to determine the motion mode of aircraft by the mode of flight test, and this also It is the final confirmation method of the aircraft motion mode when the aircraft is finalized. Aircraft motion modes mainly include longitudinal short-period motion modes mode, longitudinal long-period motion mode, Dutch roll motion mode, rolling motion mode and sp...

Claims

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Application Information

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IPC IPC(8): G01M9/00
Inventor 曾小波
Owner CHENGDU AIRCRAFT INDUSTRY GROUP