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Free vibration dynamic derivative test data analysis method with friction force being taken into consideration

A technology of data analysis and dynamic derivative, which is applied in the direction of electric digital data processing, aerodynamic test, special data processing application, etc., can solve problems such as the deviation of dynamic derivative estimation results, achieve improved accuracy, high reliability, and reduce identification The effect of deviation

Active Publication Date: 2015-12-09
CHINA ACAD OF AEROSPACE AERODYNAMICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Neglecting the change of the friction torque will also cause deviations in the estimated results of the dynamic derivative

Method used

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  • Free vibration dynamic derivative test data analysis method with friction force being taken into consideration
  • Free vibration dynamic derivative test data analysis method with friction force being taken into consideration
  • Free vibration dynamic derivative test data analysis method with friction force being taken into consideration

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Embodiment Construction

[0039] Below in conjunction with the accompanying drawings, taking the data analysis process of the pitching motion derivative test as an example, the present invention will be further described in detail, so that those skilled in the art can implement it with reference to the description.

[0040] It should be understood that terms such as "having", "comprising" and "including" as used herein do not entail the presence or addition of one or more other elements or combinations thereof.

[0041] The invention consists of dynamic modeling, parameter identification technology and identification result screening criteria. Such as image 3 shown, including the following steps:

[0042] Step 1. Measure the attitude angle of the aircraft through the free vibration dynamic stability derivative wind tunnel test, wherein the attitude angle is the pitch angle or yaw angle of the aircraft; that is, in the early stage of test analysis, the vibration dynamic process of the aircraft is studie...

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Abstract

The invention relates to a free vibration dynamic derivative test data analysis method with friction force being taken into consideration. The method can accurately calculates out dynamic stability derivative of an aircraft according to test data of a pitching and yaw free vibration dynamic stability wind tunnel test, and is especially suitable for a test system, where the system friction force cannot be neglected. The technical scheme is that, to begin with, adding a friction torque item to a vibration kinetic equation of the aircraft; then, identifying related aerodynamic parameters from the test data by utilizing parameter identification technology; and finally, establishing a screening criterion according to the relation between static aerodynamic force and model gravity to obtain final dynamic stability derivative data.

Description

technical field [0001] The invention relates to a data analysis method of free vibration dynamic derivative test considering friction force. Especially for the analysis of test data when the friction force of the system is significantly affected. Background technique [0002] The free vibration dynamic stability derivative (dynamic derivative for short) wind tunnel test of the aircraft has become the main test method to obtain the dynamic derivative of the aircraft due to its advantages of high technical maturity, low cost, easy control, and short test preparation period. [0003] The free vibration dynamic derivative test device consists of a dynamic balance, an excitation device, a strain sensor, a support device and a data acquisition system. In the test, the aircraft model is fixedly connected to one end of the dynamic balance, and the other end of the balance is installed on the support device of the wind tunnel. After the wind tunnel is started, the aircraft model wi...

Claims

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Application Information

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IPC IPC(8): G01M9/02G06F19/00
Inventor 张玉石赵俊波梁彬付增良高清
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS