Adaptive Control of a Nonlinear Convertiplane under Conditions of Uncertainty

Purpose of research. The article deals with the problem of monitoring water areas in order to control their physical and chemical conditions using a flying laboratory (FL) which includes an aircraft with attachable water intake equipment and a software and hardware system. A specific feature of the monitoring of surface waters is the unpredictable behavior of air and water, periodic absence of visual contact with the aircraft, the uncertainty of tricopter characteristics. Therefore, the purpose of this article is to study the parameters of the control system (CS) to meet the requirements for the accuracy of aircraft positioning in conditions of uncertainty of external parameters.
Methods. Theoretical mechanics and robot mechanics methods were used to solve the set tasks. Methods for mathematical modeling of dynamic systems were used to study the patterns of convertiplane movement. Adaptive control with a reference model were used to plan and control the movement of the aircraft. Results. The use of adaptive FL motion control made it possible to ensure convergence to zero of the tracking errors i.e., the difference between the output signals and the reference model. The proposed control system gives a good result with small disturbing effects. The parameters of the regulator that ensure the quality indicators of the ACS within the specified limits are determined.
Conclusion. A mathematical model was developed and mathematical modeling of the convertiplane movement under conditions of uncertainty of external influences was performed. The problem of parameter control of a convertiplane was considered when the control coefficients were available for setting. The developed algorithms in the adaptive control system made it possible to provide faster suppression of external disturbances in comparison with the traditional PID control system for the case of a linear description of the controlled object.

1. Elbanna A. E. A. et al. Improved Design and Implementation of Automatic Flight Control System (AFCS) for a Fixed Wing Small UAV. Radioengineering, 2018, vol. 27, no. 3.

2. Sahwee Z. et al. Wind tunnel evaluation for control transition from elevator to stabilator of small UAV. J. Eng. Sci. Technol, 2017, vol. 12, no. 6, pp. 1617-1626.

3. Yacun S.F., Emel'yanova O.V., Kazaryan G.K. [Convertiplane unmanned aerial vehicle control algorithm] Bespilotnye transportnye sredstva s elementami iskusstvennogo intellekta (BTS-II-2016). Trudy tret'ego Vserossijskogo nauchno-prakticheskogo seminara. [Unmanned vehicles with elements of artificial intelligence (BTS-AI-2016). Proceedings of the third all-Russian scientific and practical seminar]. Innopolis, 2016, pp. 147-157 (In Russ).

4. Jatsun S., Emelyanova O., Andres S. M. Leon, Stykanyova S. Control fligth of a UAV type tricopter with fuzzy logic controller. 2017 Dynamics of Systems, Mechanisms and Machines (Dynamics), 2017, pp. 1-5. IEEE.

5. Jatsun S., Emelyanova O., Leon A. S. M. Design of an Experimental Test Bench for a UAV Type Convertiplane. IOP Conference Series: Materials Science and Engineering. IOP Publishing, 2020, vol. 714, no. 1, 012009 p.

6. Yatsun S.F., Emelyanova O.V., Savin A.I. Upravlenie poletom trikoptera-2016 [Flight control trikoptera2016]. Computer Program Registration Certificate № 2016615163 RF, 17.05.2016.

7. Yacun S.F., Emel'yanova O.V., Efimov S.V. [Mechanisms of convertiplane] Novye mekhanizmy v sovremennoj robototekhnike [New mechanisms in modern robotics]. Moscow, Tekhnosfera Publ., 2018, pp. 247-267 (In Russ.).

8. Jatsun S. F., Lushnikov B. V., Emelyanova O. V., Stukaneva S. P. Study of Tiltrotor Oscillations in a Vertical Longitudinal Plane. Izvestiya Yugo-Zapadnogo gosudarstvennogo universiteta = Proceedings of the Southwest State University. 2019, 23(4): 42-56 (In Russ.). https://doi.org/ 10.21869/2223-1560-2019-23-4-42-56.

9. Jatsun S.F., Efimov S. V., Emilyanova O.V., Martinez Leon A. S. Modeling and control architecture of autonomous mobile aerial platform environmental monitoring. 4 International conference on information systems and computer science-inciscos, 2019 held io QuitoEcuador. Available at: https://ieeexplore.ieee.org/abstract/document/9052260

10. Yacun S.F., Emel'yanova O.V., Savin S.I. Matematicheskoe modelirovanie konvertoplana s central'no raspolozhennym upravlyaemym privodom [Mathematical modeling of a tiltrotor with a centrally located controlled drive]. Izvestiya Yugo-Zapadnogo gosudarstvennogo universiteta. Seriya: Tekhnika i tekhnologii = Proceedings of the Southwest State University. Series: Engineering and Technologies, 2015, no.4(17), pp. 31-37 (In Russ.)

11. Emelyanova O.V., Kazaryan G.K., Martinez Leon A.S., Jatsun S.F. The synthesis of electric drives characteristics of the UAV of “convertiplane – tricopter” type/ MATEC Web Conf. Volume 99, 2017 2016 Workshop on Contemporary Materials and Technologies in the Aviation Industry (CMTAI2016). https://doi.org/10.1051/matecconf/20179902002

12. Emel'yanova O.V., Kazaryan G.K., Martinez Leon A.S., Yacun S.F., Stukaneva S.P. [Synthesis of parameters of electric drives of UAV type" tiltrotortricopter] IV Mezhdunarodnaya shkola-konferenciya molodyh uchenyh "Nelinejnaya dinamika mashin" [IV international school-conference of young scientists "Nonlinear dynamics of machines"]. Moscow, 2017, pp. 239-249 (In Russ.).

13. Jatsun S. [et al.] Investigation of Oscillations of a Quadcopter Convertiplane in Transient Mode in the Vertical Longitudinal Plane. Proceedings of 14th International Conference on Electromechanics and Robotics “Zavalishin's Readings”. Springer, Singapore, 2020, pp. 345-358.

14. Yatsun S.F., Mishchenko V.Y., Martinez A., Emelyanova O.V. Dvizhitel' vozdushnyi s izmenyaemym vektorom tyagi [Air propulsor with variable thrust vector]. Patent for useful model RF. № 187784, 28.12.2018.

15. Safarov D. I., Emel'yanova O. V., Loktionova O. G. Modelirovanie processa dvizheniya chasticy zagryaznenij v potoke zhidkosti [Modeling of the process of movement of a particle of contamination in a liquid flow]. Izvestiya Yugo-Zapadnogo gosudarstvennogo universiteta = Proceedings of the Southwest State University, 2012, no. 4-2, pp. 225-227 (In Russ).

16. Loktionova O. G., Safarov D. I., Emel'yanova O. V. Issledovanie dvizheniya chasticy v potoke zhidkosti pri ochistke stochnyh vod [Investigation of particle movement in the liquid flow during wastewater treatment]. Izvestiya Yugo-Zapadnogo gosudarstvennogo universiteta. Seriya: Tekhnika i tekhnologii = Proceedings of the Southwest State University. Series: Engineering and Technologies, 2012, no. 2-1, pp. 163-172 (In Russ).

17. Martinez Leon A. S., Lushnikov B. V., Yacun S. F. Realizaciya dinamicheskoj modeli kvadrokoptera v srede SimMechanics MATLAB s pomoshch'yu funkcii CADtranslyatora Solid-Works [Implementation of a dynamic model of a quadrocopter in the SimMechanics/ MATLAB environment using the Solid-Works CAD translator function]. Cloud of Science, 2020, vol. 7, no. 2. pp. 347-357 (In Russ).

18. Burakov M. V. [Modification of an adaptive system with a reference model]. Perspektivnye informacionnye tekhnologii. Sbornik. [Promisihg Information Technology-2016. Collection]. Samara, 2016, pp. 205-208 (In Russ)

19. Tomchina O. P. i dr. Adaptivnoe upravlenie nestacionarnymi nelinejnymi ob"ektami na osnove algoritmov skorostnogo gradienta [Adaptive control of non-stationary nonlinear objects based on velocity gradient algorithms]. Informacionno-upravlyayushchie sistemy=Management Information Systems, 2019, no. 3, pp. 37-44 (In Russ).