Reconstruction method of aerodynamic model in ground flutter test

Abstract

The embodiment of the invention discloses a reconstruction method for an aerodynamic model in a ground flutter test, and the reconstruction method achieves the reconstruction of the aerodynamic modelthrough modal shape excitation, physical coordinate and modal coordinate conversion and interpolation point polycondensation. In a reconstruction process, vibration mode excitation is carried out on amode participating in flutter; obtaining an aerodynamic force influence coefficient matrix under frequency domain and modal coordinates; the method comprises the following steps: performing conversion of physical quantities under modal coordinates and physical coordinates, performing optimal configuration on interpolation points through a genetic algorithm to realize polycondensation of the interpolation points, and finally fitting frequency domain aerodynamic force to a time domain through a rational function fitting mode to obtain an aerodynamic force model meeting the requirements of a ground flutter test. The reconstruction method provided by the embodiment of the invention has the advantages that the precision is high, the calculation efficiency is high, and the model reconstructionprocess is simple and feasible; the test precision of the ground flutter test in a transonic region is improved, so that the effect of expanding the application range of the ground flutter test is achieved.

Description

technical field [0001] The present application relates to but not limited to the technical field of aeroelasticity test, in particular to a reconstruction method of an aerodynamic model in a ground flutter test. Background technique [0002] Flutter is a typical fluid-structure interaction phenomenon. At present, the commonly used verification methods mainly include wind tunnel test and flight test. In view of the certain risks of the above two tests, and the long test period and high cost, a ground flutter test system based on ground vibration test is currently proposed. , can simulate and test the flutter characteristics on the ground. [0003] A key to ground flutter tests is to reconstruct the aerodynamic model of the structure on the ground. The aerodynamic model uses the structural response as input to reconstruct the unsteady aerodynamic force of the structure. At present, the commonly used aerodynamic model is a frequency-domain aerodynamic model based on the assum...

AI Technical Summary

Problems solved by technology

At present, the commonly used aerodynamic model is a frequency-domain aerodynamic model based on the assumption of linear small disturbances. The calculation results of this model are relatively accurate in the subsonic and supersonic ranges, but in the transonic region, the calculation accuracy of the above model is difficult to meet the engineering requirements. Require

At present, in the calculation of transonic aerodynamics, the accuracy of the CFD method is relatively high, but because CFD is a time-domain method, the calculation is time-consuming and cannot meet the real-time requirements of the ground flutter for the aerodynamic model

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