Abstract
A direct adaptive interval type-2 fuzzy neural network (IT2-FNN) controller is designed for the first time in hypersonic flight control. The generic hypersonic flight vehicle is a multi-input multi-output system whose longitudinal model is high-order, highly nonlinear, tight coupling and most of all includes big uncertainties. Interval type-2 fuzzy sets with Gaussian membership functions are used in antecedent and consequent parts of fuzzy rules. The IT2-FNN directly outputs elevator deflection and throttle setting which make the GHFV track the altitude command signal and meanwhile maintain its velocity. The parameter adaptive law of IT2-FNN is derived using backpropagation method. The deviation of the control signal from the nominal dynamic inversion control signal is used as the reference output signal of IT2-FNN. The tracking errors of velocity and altitude are used as inputs of IT2-FNN. Tracking differentiator is designed to form an arranged transition process (ATP) of the command signal as well as ATP’s high-order derivatives. Nonlinear state observer is designed to get the approximations of velocity, altitude as well as their high-order derivatives. Simulation results validate the effectiveness and robustness of the proposed controller especially under big uncertainties.
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Abbreviations
- \(V\) :
-
Velocity, m/s
- \(q\) :
-
Pitch rate, rad/s
- \(\gamma \) :
-
Flight path angle, rad
- \(\alpha \) :
-
Angle of attack, rad
- \(h\) :
-
Altitude, m
- \(M_y\) :
-
Pitch moment, N m
- \(I_y\) :
-
Moment of inertia, \(\mathrm{kg}~\mathrm{m}^2\)
- \(r\) :
-
Radial distance from Earth’s center, m
- \(\mu \) :
-
Gravitational constant
- \(m\) :
-
Mass, kg
- \(s\) :
-
Reference area, \(\mathrm{m}^2\)
- \(\rho \) :
-
Density of air, \(\mathrm{kg/m}^3\)
- \(\bar{c}\) :
-
Mean aerodynamic chord, m
- \(R_{\scriptscriptstyle E}\) :
-
Radius of the earth, m
- \(\beta \) :
-
Fuel equivalence ratio
- \(\delta _t\) :
-
Throttle setting instruction
- \(\delta _e\) :
-
Elevator deflection, rad
- \(L\) :
-
Lift, N
- \(D\) :
-
Drag, N
- \(T\) :
-
Thrust, N
- \(C_{\scriptscriptstyle L}\) :
-
Lift coefficient
- \(C_{\scriptscriptstyle D}\) :
-
Drag coefficient
- \(C_{\scriptscriptstyle T}\) :
-
Thrust coefficient
- \(C_{\scriptscriptstyle M}\) :
-
Pitch moment coefficient
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Acknowledgments
This work was supported by National Natural Science Foundation of China under Grant 61203003, 61273149 and 60904006, Knowledge Innovation Program of the Chinese Academy of Sciences under Grant YYYJ-1122, and Innovation Method Fund of China under Grant 2012IM010200, and B1320133020.
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Communicated by C. Alippi, D. Zaho and D. Liu.
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Yang, F., Yuan, R., Yi, J. et al. Direct adaptive type-2 fuzzy neural network control for a generic hypersonic flight vehicle. Soft Comput 17, 2053–2064 (2013). https://doi.org/10.1007/s00500-013-1123-6
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DOI: https://doi.org/10.1007/s00500-013-1123-6