Abstract
The landing of a civil transport aircraft is one of the most critical phases due to parametric uncertainties and strong crosswind conditions. In this paper, separate controllers are designed for longitudinal and lateral-directional channels for the landing phase, which is divided into the final approach, flare, and decrab. A multivariable model reference adaptive control scheme is implemented with state feedback for output tracking. The safety and flight performance of the autolanding control system are demonstrated through Monte Carlo simulations of a nonlinear civil transport aircraft model.
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Abbreviations
- \( D_{\text{LG}} \) :
-
Distance to threshold
- \( H \) :
-
Altitude
- \( H_{\text{LG}} \) :
-
Landing gear height
- \( n = [n_{x} ,n_{y} ,n_{z} ] \) :
-
Load factors
- \( ss_{\text{LG}} \) :
-
Landing gear sideslip angle
- \( u = [\delta_{\text{th}} ,\delta_{\text{e}} ,\delta_{\text{a}} ,\delta_{\text{r}} ] \) :
-
Control inputs (thrust, elevator, aileron, and rudder)
- \( V = [u,v,w] \) :
-
Translational speeds
- \( V_{a} \) :
-
True airspeed
- \( V_{c} \) :
-
Calibrated airspeed
- \( V_{g} \) :
-
Ground speed
- \( V_{Z} \) :
-
Vertical airspeed
- \( V_{{Z_{{\rm {LG}}} }} \) :
-
Landing gear vertical speed
- \( w = [w_{x} ,w_{y} ,w_{z} ] \) :
-
Wind speeds
- \( X = [x,y,z] \) :
-
Position of the center of gravity of the aircraft
- \( Y_{\text{LG}} \) :
-
Deviation from runway axis
- \( \alpha \) :
-
Angle of attack
- \( \beta \) :
-
Aerodynamic sideslip angle
- \( \Delta = [\Delta_{\text{loc}} ,\Delta_{\text{gld}} ] \) :
-
ILS noises (localizer noise and glide noise)
- \( \Delta y \) :
-
Localizer deviation
- \( \Delta z \) :
-
Glide deviation
- \( \chi \) :
-
Flight path azimuth angle
- \( \varOmega = [p,q,r] \) :
-
Angular rates
- \( \varPhi = [\phi ,\theta ,\psi ] \) :
-
Attitude angles
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Acknowledgments
This research was sponsored by the National Natural Science Foundation of China under the Grant #61473186.
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Wang, Y., Li, Q. & Lu, B. Automatic landing system design via multivariable model reference adaptive control. AS 1, 63–71 (2018). https://doi.org/10.1007/s42401-018-0006-z
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DOI: https://doi.org/10.1007/s42401-018-0006-z