Time-varying linear control for tiltrotor aircraft

Zhang, J, Sun, L, Qu, X and Wang, L 2018, 'Time-varying linear control for tiltrotor aircraft', Chinese Journal of Aeronautics, vol. 31, no. 4, pp. 632-642.

Document type: Journal Article
Collection: Journal Articles

Title Time-varying linear control for tiltrotor aircraft
Author(s) Zhang, J
Sun, L
Qu, X
Wang, L
Year 2018
Journal name Chinese Journal of Aeronautics
Volume number 31
Issue number 4
Start page 632
End page 642
Total pages 11
Publisher Zhongguo Hangkong Xuehui
Abstract Tiltrotor aircraft have three flight modes: helicopter mode, airplane mode, and transition mode. A tiltrotor has characteristics of highly nonlinear, time-varying flight dynamics and inertial/control couplings in its transition mode. It can transit from the helicopter mode to the airplane mode by tilting its nacelles, and an effective controller is crucial to accomplish tilting transition missions. Longitudinal dynamic characteristics of the tiltrotor are described by a nonlinear Lagrange-form model, which takes into account inertial/control couplings and aerodynamic interferences. Reference commands for airspeed velocity and attitude in the transition mode are calculated dynamically by visiting a command library which is founded in advance by analyzing the flight envelope of the tiltrotor. A Time-Varying Linear (TVL) model is obtained using a Taylor-expansion based online linearization technique from the nonlinear model. Subsequently, based on an optimal control concept, an online optimization based control method with input constraints considered is proposed. To validate the proposed control method, three typical tilting transition missions are simulated using the nonlinear model of XV-15 tiltrotor aircraft. Simulation results show that the controller can be used to control the tiltrotor throughout its operating envelop which includes a transition flight, and can also deal with vertical gust disturbances.
Subject Physical Sciences not elsewhere classified
Engineering not elsewhere classified
Keyword(s) Constrained optimal control
Inertia/control couplings
Tiltrotor aircraft
Time-varying control
Transition mode
DOI - identifier 10.1016/j.cja.2018.01.025
Copyright notice © 2018 Chinese Society of Aeronautics and Astronautics. Production and hosting by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
ISSN 1000-9361
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