K. Tak and J. Kim, "Corrosion effect on inspection and replacement planning for a refinery plant," Computers &Chemical Engineering, vol. 117, pp. 97-104, 2018.
https://www.oulu.fi/hyfliers/.
C. Luo, W. Zhao, Z. Du, and L. Yu, "A neural network based landing method for an unmanned aerial vehicle with soft landing gears," Applied Sciences, vol. 9, p. 2976, 2019.
A. Sahinoz, "Landing gear design and stability evaluation of a lunar lander for soft landing," in Proceedings of the Bennett conference on mechanical engineering, Pittsburgh, PA, USA, 2012, pp. 1-17.
K. Zhang, P. Chermprayong, D. Tzoumanikas, W. Li, M. Grimm, M. Smentoch, et al., "Bioinspired design of a landing system with soft shock absorbers for autonomous aerial robots," Journal of Field Robotics, vol. 36, pp. 230-251, 2019.
K. Hang, X. Lyu, H. Song, J. A. Stork, A. M. Dollar, D. Kragic, et al., "Perching and resting-A paradigm for UAV maneuvering with modularized landing gears," Science Robotics, vol. 4, 2019.
L. Son, M. Surya, M. Bur, U. Ubaidillah, and R. Dhelika, "Shock and harmonic response analysis of UAV nose landing gear system with air damper," Cogent Engineering, vol. 8, p. 1905231, 2021.
K. S. Peterson and A. G. Stefanopoulou, "Extremum seeking control for soft landing of an electromechanical valve actuator," Automatica, vol. 40, pp. 1063-1069, 2004.
H. Yang and H. Baoyin, "Fuel-optimal control for soft landing on an irregular asteroid," IEEE Transactions on Aerospace and Electronic Systems, vol. 51, pp. 1688-1697, 2015.
P. Mercorelli, "An antisaturating adaptive preaction and a slide surface to achieve soft landing control for electromagnetic actuators," IEEE/ASME Transactions on Mechatronics, vol. 17, pp. 76-85, 2010.
W. Myeong and H. Myung, "Development of a wallclimbing drone capable of vertical soft landing using a tiltrotor mechanism," IEEE Access, vol. 7, pp. 4868-4879, 2018.
K. Fricke, R. Giorgiani do Nascimento, and F. Viana, "Quadcopter soft vertical landing control with hybrid physics-informed machine learning," in AIAA Scitech 2021 Forum, 2021, p. 1018.
J. S. Hayden, "The effect of the ground on helicopter hovering power required," in Proc. AHS 32nd Annual Forum, 1976.
H. C. Curtiss, M. Sun, W. F. Putman, and E. J. Hanker, "Rotor aerodynamics in ground effect at low advance ratios," Journal of the American Helicopter Society, vol. 29, pp. 48-55, 1984.
T. E. Lee, J. G. Leishman, and M. Ramasamy, "Fluid dynamics of interacting blade tip vortices with a ground plane," Journal of the American Helicopter Society, vol. 55, pp. 22005-22005, 2010.
C. Powers, D. Mellinger, A. Kushleyev, B. Kothmann, and V. Kumar, "Influence of aerodynamics and proximity effects in quadrotor flight," in Experimental Robotics, 2013, pp. 289-302.
P. J. Sanchez-Cuevas, G. Heredia, and A. Ollero, "Experimental approach to the aerodynamic effects produced in multirotors flying close to obstacles," in Iberian Robotics Conference, 2017, pp. 742-752.
P. Sanchez-Cuevas, G. Heredia, and A. Ollero, "Characterization of the aerodynamic ground effect and its influence in multirotor control," International Journal of Aerospace Engineering, vol. 2017, 2017.
X. Kan, J. Thomas, H. Teng, H. G. Tanner, V. Kumar, and K. Karydis, "Analysis of ground effect for small-scale UAVS in forward flight," IEEE Robotics and Automation Letters, vol. 4, pp. 3860-3867, 2019.
G. Shi, X. Shi, M. O'Connell, R. Yu, K. Azizzadenesheli, A. Anandkumar, et al., "Neural lander: Stable drone landing control using learned dynamics," in 2019 International Conference on Robotics and Automation (ICRA), Montreal, Montreal, Canada, 2019, pp. 9784-9790.
J.-G. Juang, H.-H. Chang, and K. C. Cheng, "Intelligent landing control using linearized inverse aircraft model," in Proceedings of the 2002 American Control Conference (IEEE Cat. No. CH37301), Anchorage, AK, USA, 2002, pp. 3269-3274.
A. Betz, "The ground effect on lifting propellers," Technical Memorandums, National Advisory Committee for Aeronautics, N. 836, 1937.
M. Lungu, "Backstepping and dynamic inversion combined controller for auto-landing of fixed wing UAVs," Aerospace Science and Technology, vol. 96, p. 105526, 2020.
S. R. Nekoo, J. R. Acosta, G. Heredia, and A. Ollero, "Softlanding of multi-rotor drones using a robust nonlinear control and wind modeling," in 2021 International Conference on Unmanned Aircraft Systems (ICUAS), Athens, Greece, 2021.
B. W. McCormick, "Aerodynamics aeronautics and flight mechanics," 2nd ed. New York NY: John Wiley &Sons Inc, 1995.
I. C. Cheeseman and W. E. Bennett, "The effect of the helicopter rotor by ground on a forward flight," Aeronautical Research Council Reports and Memoranda, No. 3021, 1957.
S. R. Nekoo, J. Á. Acosta, and A. Ollero, "Geometric control using the state-dependent Riccati equation: Application to aerial-acrobatic maneuvers," International Journal of Control, pp. 1-13, 2021.
S. R. Nekoo, J. Á. Acosta, A. E. Gomez-Tamm, and A. Ollero, "Optimized thrust allocation of variable-pitch propellers quadrotor control: A comparative study on flip maneuver," in 2019 Workshop on Research, Education and Development of Unmanned Aerial Systems (RED UAS), Cranfield, United Kingdom, United Kingdom, 2019, pp. 86-95.
S. R. Nekoo, J. Á. Acosta, and A. Ollero, "Collision avoidance of SDRE controller using artificial potential field method: Application to aerial robotics," in 2020 International Conference on Unmanned Aircraft Systems (ICUAS), Athens, Greece, 2020, pp. 551-556.
S. R. Nekoo, J. Á. Acosta, and A. Ollero, "Fully coupled six-DoF nonlinear suboptimal control of a quadrotor: Application to variable-pitch rotor design," in Iberian Robotics conference, 2019, pp. 72-83.
F. Sabatino, "Quadrotor control: Modeling, nonlinear control design, and simulation," Master's Degree Project, KTH Electrical Engineering, Stockholm, Sweden, 2015.
P. R. Ambati and R. Padhi, "A neuro-adaptive augmented dynamic inversion design for robust auto-landing," IFAC Proceedings Volumes, vol. 47, pp. 12202-12207, 2014.
P. J. Sanchez-Cuevas, G. Heredia, and A. Ollero, "Multirotor UAS for bridge inspection by contact using the ceiling effect," in 2017 International Conference on Unmanned Aircraft Systems (ICUAS), 2017, pp. 767-774.
L. Meier, D. Honegger, and M. Pollefeys, "PX4: A nodebased multithreaded open source robotics framework for deeply embedded platforms," in 2015 IEEE international conference on robotics and automation (ICRA), 2015, pp. 6235-6240.
