Time-varying aerodynamic load ground equivalent simulation method in aircraft vibration test

A vibration test and aerodynamic load technology, applied in the field of effect simulation, can solve the problem that the unsteady aerodynamic calculation method is no longer fully applicable, and achieve the effect of enhanced processing capacity, high fitting accuracy, and high calculation accuracy

Active Publication Date: 2022-07-29
CHINA AIRPLANT STRENGTH RES INST
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A major premise for the above modeling method to be established is that the dynamic characteristics of the structure do not change, and in the actual aircraft structure, whether it is the time-varying characteristics of the thermal mode of the structure caused by the deflection of the rudder surface or the aerothermal effect, it will make the existing Unsteady aerodynamic calculation methods are no longer fully applicable

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  • Time-varying aerodynamic load ground equivalent simulation method in aircraft vibration test
  • Time-varying aerodynamic load ground equivalent simulation method in aircraft vibration test
  • Time-varying aerodynamic load ground equivalent simulation method in aircraft vibration test

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Experimental program
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Effect test

Embodiment 1

[0093] This embodiment is a ground equivalent simulation method for time-varying aerodynamic loads in an aircraft vibration test, such as figure 1 shown, including the following steps:

[0094] S1. Based on the assumption of time freezing, by fitting the Kriging surrogate model of the unsteady aerodynamic fast calculation model of multiple discrete time points, an unsteady aerodynamic fast calculation model suitable for the entire time-varying history of the aircraft vibration test is obtained, such as Figure 5 shown, including the following steps:

[0095] S1-1. Establish the calculation formula for the unsteady aerodynamic force at the control point of the test piece

[0096] According to the structural vibration response of the test piece in the aircraft ground flutter test, the unsteady aerodynamic force on the control point of the test piece is calculated. The calculation formula of the unsteady aerodynamic force on the control point of the test piece is as follows:

...

Embodiment 2

[0155] The difference between this embodiment and Embodiment 1 is:

[0156] In step S2-3, the temperature of the initial temperature field is 55°C, and the temperature of the steady-state temperature field is 490°C.

Embodiment 3

[0158] The difference between this embodiment and Embodiment 1 is:

[0159] S2. Test and verify the unsteady aerodynamic fast calculation model established in step S1 through the actual aircraft ground flutter test, which specifically includes the following steps:

[0160] S2-1, such as Image 6 As shown, the interpolation points between the aerodynamic plane and the structure in the flutter calculation of the aircraft ground flutter test are polycondensed, and the optimal interpolation points are selected by the optimization method. The optimal interpolation points are: the excitation point and the pick-up point. The optimal interpolation point is used as the control point of the test piece, and then an unsteady aerodynamic fast calculation model suitable for the control point of the test piece is established through step S1;

[0161]S2-2. Arrange a heater above the test piece, fix the exciter at the bottom of the test piece, a power amplifier electrically connected to the e...

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Abstract

The invention provides a time-varying aerodynamic load ground equivalent simulation method in an aircraft vibration test, and belongs to the technical field of aircraft vibration tests. The method comprises the following steps: S1, obtaining an unsteady aerodynamic force rapid calculation model suitable for the whole time-varying process of an aircraft vibration test based on a time freezing hypothesis; s2, performing simulation verification on the unsteady aerodynamic force rapid calculation model to obtain an unsteady aerodynamic force rapid calculation model after simulation verification; and S3, carrying out time-varying aerodynamic load ground equivalent simulation in an aircraft vibration test by adopting the unsteady aerodynamic force rapid calculation model after simulation verification. The method solves the problem that the current aircraft vibration test simulation can only be applied to a steady system, and has the advantages of effectively perfecting the current aircraft vibration test simulation technology and promoting the application progress of aircraft vibration test simulation engineering.

Description

technical field [0001] The invention relates to the technical field of aircraft vibration tests, in particular to a ground equivalent simulation method for time-varying aerodynamic loads in aircraft vibration tests. Background technique [0002] As a semi-physical simulation flutter verification technology developed in recent years, the aircraft vibration test simulation technology takes the real structure as the verification object, and has the advantages of small risk, short period and high precision. This technology uses the sensor to measure the vibration response signal of the structure, substitute it into the pre-calculated unsteady aerodynamic model to obtain the equivalent aerodynamic force of the structure, and then use the vibration exciter to load the equivalent aerodynamic force on the test structure in real time to form a closed loop The system realizes the simulation of structural flutter phenomenon on the ground. By applying an initial perturbation to the tes...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G06F30/28G06F30/15G06F113/08G06F119/14
CPCG06F30/28G06F30/15G06F2113/08G06F2119/14
Inventor王彬文陈浩宇宋巧治李晓东杨文岐梁森
OwnerCHINA AIRPLANT STRENGTH RES INST