Research on Longitudinal Static Stability for VFSW Tailless Configuration UAV

Abstract:

The Variable Forward-Swept Wing (VFSW) Tailless configuration UAV can well satisfy multipurpose demands. However, this kind of unconventional morphing aircraft lacks tail, which brings great challenge to stability analysis. The connatural aero-elasticity divergence and the strong aerodynamic coupling as well as many uncertain factors in mechanical environment, give the VFSW Tailless configuration UAV complicated dynamic characteristics. During the process of transformation, the variation of dynamic shape will inevitably lead to the variation about aerodynamic center and barycentre positions of airplane, then make the angle of attack static stability margin variable, and directly influence stability of aircraft. On the basis of introduction of the VFSW Tailless configuration UAV, according to its geometric shape, positions of aerodynamic center and barycentre, in different states with different forward-swept angle, were calculated, so as to obtain variation curve of longitudinal static stability margin, which provided preferences for dynamics analysis, position of barycentre adjustment and design of flight control system (FCS).

• Periodical: Applied Mechanics and Materials (Volumes 543-547)
• Pages: 348-353
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.543-547.348
• Online since: March 2014
• Authors: Xin Bing Su*, Zhou Zhou, Jing Cheng Shi, Xu Wang
• Keywords: Longitudinal, Numerical Calculation, Static Stability, Unmanned Aerial Vehicle (UAV), Variable Forward-Swept Wing (VFSW)

References

[1] Thomas Michael Seigler. Dynamics and Control of Morphing Aircraft [D]. Virginia Polytechnic Institute and State University, August (2005).

[2] Moore,M. and D. Frei. X-29 Forward Swept Wing Aerodynamic Overview[R]. AIAA-83-18 34, AIAA Applied Aerodynamics Conference, Danvers, MA, July 13-15, (1983).

DOI: 10.2514/6.1983-1834

[3] Edwin J. Saltzman and John W. Hicks. In-flight Lift-drag Characteristics for a Forward-swept Wing Aircraft(and Comparisons with Contemporary Aircraft)[R]. NASA Technical Report 3414, 1994. 12.

[4] Liu W F, Wang X, Mi Kang. A New Aerodynamic Configuration of UAV with Variable Forward-swept Wing [J]. Acta Aeronautica Et Astronautica Sinica, 2009, 30(5), 832-836.

[5] Chen P, Wang X, Hu M Q, Yu C. The Design of Wing-Body Switching Mechanism with Two Slideway[J]. Acta Aeronautica Et Astronautica Sinica, 2012, 33(11), 2010-(2017).

[6] Gao J Y. Aircraft Handling Qualities [M]. Beijing: Aviation Industry Press, 2003: 10-28.

[7] Chen T N. Aircraft Flying Property Handling Qualities and Control [M]. Beijing: Aviation Industry Press, 2010, 78-84.

[8] Wang D Q. Aircraft Aerodynamic Handbook(Volume Ⅱ)[M]. Beijing: Aviation Industry Press, 1983, 750-756.