Abstract

Morphing aircraft has been the research hot topics of new concept aircrafts in aerospace engineering. Telescopic wing is an important morphing technology for morphing aircraft. This paper describes the dynamic equations and kinematic equations based on theorem of momentum and theorem of moment of momentum, which are available for all morphing aircrafts. Meanwhile,as simplified , dynamic equations for rectangular telescopic wing are presented. In order to avoid the complexity using aileron to generate rolling moment , an new idea that asymmetry of wings can generate roll moment is introduced. Finally, roll performance comparison of asymmetric wing and aileron deflection shows that asymmetric telescopic wing can provide the required roll control moment as aileron, and in some cases, telescopic wing has the superior roll performance.

Highlights

  • Morphing aircraft has been investigated extensively because of its superior flight performance[1, 2]

  • The dynamic equations and kinematic equations of asymmetric telescopic wing aircraft are developed.From the equations, it is very complex and difficult to solve such equation series, because several parameters change with time.Hower, the model is versatile for any telescopic morphing aircraft, in some simple assumptions

  • This paper bulid the model of rectangular telescopic wing with no sweep and dihedral.Some estimation formulae are applied to caculate the aerodynamic force

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Summary

Introduction

Morphing aircraft has been investigated extensively because of its superior flight performance[1, 2]. Morphing aircraft can adapt various complicated flight regimes.The Defense Advanced Research Projects Agency (DARPA) developed Morphing Aircraft Program in 1998. Morphing aircraft can be classified three types:micro morphing ǃ small morphing and large morphing. Micro morphing includes variable camber[3, 4] and twist[5], small morphing contains variable tip and variable horizontal tail, while variable sweep[6, 7],variable span[8] and folding wing belong to large morphing. This paper mainly concentrates on telescopic wing which is one of large morphing techniques. Telescopic Wing is intended to change its wing span for various flight conditions to reduce drag. As aresult of increasing the wing span, the aspect ratio and wing area increase and the spanwise lift distribution decreases for the same lift[8].Telescopic wing has a long research history, many patents of invention have been declared[9], as shown in Fig., which is three patents about telescopic wing

Dynamic model
L S uV
Kinematic model
Analysis for an example
Estimation of aerodynamic force
Rolling moment coefficient generated by aileron is caculated
Rolling moment coefficient by asymmetric wing can be caculated
Findings
Conclusions
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