动导数数值预测中的相关问题

doi:10.7527/S1000-6893.2016.0180

Abstract

Abstract:

Dynamic stability derivative is one of the important parameters in the design of control system, the design of flight orbit, and the analysis of dynamic stability of vehicles. The prediction methods of the dynamic stability derivatives mainly include the engineering approximations, numerical simulations and wind tunnel tests. The concepts of dynamic stability derivative and cross derivative are reviewed, and the forced oscillation and free oscillation methods for numerically predicting the dynamic stability derivatives are introduced. The problems existing in the numerical prediction are specially discussed, including the choice of time-marching step and step number of sub-iteration, the effects of the oscillating frequency on the identification results, the analysis of the probable reasons which lead to the difference between the forced oscillation and free oscillation methods in dynamic derivative identification, the identification of the cross and cross coupling derivatives, and the identification of dynamic stability derivatives of the integrated internal-external flow vehicles. The discussions are made with computational cases and detailed analysis, in which both experiences and puzzles exist, and the corresponding suggestions for improvement are presented.

Key words: dynamic derivative, cross derivative, forced oscillation, free oscillation, oscillating frequency

CLC Number:

V211.3

YUAN Xianxu, CHEN Qi, XIE Yufei, CHEN Jianqiang. Problems in numerical prediction of dynamic stability derivatives[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(8): 2385-2394.

References

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Problems in numerical prediction of dynamic stability derivatives

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