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Judgment on main flutter mode in high-speed flutter model design
Received date: 2014-07-29
Revised date: 2014-09-10
Online published: 2015-04-27
Supported by
National Natural Science Foundation of China (91216202); National Defense Basic Research Program (B0320110011)
It is difficult to achieve completely dynamic similarity for flutter model design. Theoretical support would be necessary to define the main flutter modes to guarantee data validity of wind tunnel flutter test. The judgment of the main flutter modes in high-speed flutter model design is studied analytically in the present paper. The effects of mode motion on generalized unsteady aerodynamic force and flutter characteristic are numerically investigated by a set of parameters, including generalized aerodynamic stiffness coefficients, unsteady aerodynamic force and flutter speeds. By comparing the results of those parameters, the interplay between mode motions is revealed. Analytical results of a high-speed sweepback wing show that the main flutter modes obtained by different methods are consistent. The aerodynamic stiffness coefficient in the expression of mode shape need not pay attention to aerodynamic force and could be taken as a quick criterion for main flutter mode selection in flutter model design and analysis.
ZHAO Ling , JI Chen , LIU Ziqiang . Judgment on main flutter mode in high-speed flutter model design[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(4) : 1112 -1118 . DOI: 10.7527/S1000-6893.2014.0252
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