临近空间太阳能飞行器横航向稳定性

doi:10.7527/S1000-6893.2015.0225

Abstract

Abstract:

The lateral-directional aerodynamic derivatives and mass characteristics of the near-space solar-powered aircraft are very different from conventional aircraft. The characteristics of its lateral-directional modes differ from conventional aircraft. Theoretic analysis shows that the large rolling-moment-due-to-yaw-rate derivative and small yawing-moment-due-to-yaw-rate derivative of the near-space solar-powered aircraft result in the divergent spiral mode. Moreover, the ratio of aerodynamic damping moment to inertia moment is large, causing the high damping ratio of the Dutch roll mode. In order to solve the problem that the impact of wind could not be represented in conventional linear dynamic model, a linear lateral-directional dynamic model, which considers the impact of wind and is applied to the 0 m/s ground speed state, is established by employing the projection of ground speed onto body coordinate system as the state variable. The lateral-directional stabilities of the near-space solar-powered aircraft in horizontal and vertical wind are analyzed using the model. The analysis indicates that stable wind field has no impact on eigenvalues of lateral-directional modes, while it leads to different eigenvectors. The established dynamic model could be used for dynamic analysis and simulation of this kind of aircraft.

Key words: near-space, solar-powered, lateral-directional, stability, mode, dynamic model, wind field

CLC Number:

V212.12

LI Feng, YE Chuan, LI Guangjia, ZHENG Anbo, FU Yiwei. Lateral-directional stability of near-space solar-powered aircraft[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(4): 1148-1158.

References

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Lateral-directional stability of near-space solar-powered aircraft

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