Publications

2022

• Oswald, J.W., Enache, A., Hann, R., Glabeke, G., Lutz, T. (2022). UAV Icing: Experimental and Numerical Study of Glaze Ice. AIAA 2022-1976. AIAA SciTech 2022 Forum. DOI: 10.2514/6.2022-1976
• Hann, R. (2022). Hazards of In-flight Icing on Unmanned Aircraft. Conference paper. SCI-328 Symposium on ‘Flight Testing of Unmanned Aerial Systems (UAS).
• Cheung, M., Hann, R., Johansen,T.A. (2022). UAV Icing: A Unified Icing Severity Index Derived from Performance Degradation. AIAA Atmospheric and Space Environments Conference
• Wallisch, J., Hann, R. (2022). UAV Icing: Experimental Investigation of Ice Shedding Times with an Electrothermal De-Icing System. AIAA Atmospheric and Space Environments Conference
• Müller, N., Hann, R. (2022). UAV Icing: A Performance Model for a UAV Propeller in Icing Conditions. AIAA Atmospheric and Space Environments Conference
• Løw-Hansen, B., Hann, R., Johansen, T.A. (2022). UAV Icing: Ice Shedding Detection Method for an Electrothermal De-Icing System. AIAA Atmospheric and Space Environments Conference

2021

• Hann, R., Enache, A., Nielsen, M.C., Stovner, B.N., van Beeck, J., Johansen, T.A., Borup, K.T. (2021). Experimental Heat Loads for Electrothermal Anti-Icing and De-Icing on UAVs. Aerospace, 8(3), 83. DOI: 10.3390/aerospace8030083 
• Hann, R., Johansen, T.A. (2021). UAV icing: the influence of airspeed and chord length on performance degradation. Aircraft Engineering and Aerospace Technology, Vol. 95, No. 5. DOI: 10.1108/AEAT-06-2020-0127
• Müller, N., Hann, R., Lutz, T. (2021). UAV Icing: Numerical Simulation of Propeller Ice Accretion. AIAA 2021-2673. AIAA Aviation 2021 Forum. DOI: 10.2514/6.2021-2673
• Haaland, O.M., Wenz, A.W., Gryte, K., Hann, R., Johansen, T.A. (2021). Detection and Isolation of Propeller Icing and Electric Propulsion System Faults in Fixed-Wing UAVs. 2021 International Conference on Unmanned Aircraft Systems (ICUAS). DOI: 10.1109/ICUAS51884.2021.9476695

2020

• Hann, R., Johansen, T.A. (2020). Unsettled Topics in Unmanned Aerial Vehicle Icing. SAE International, SAE EDGE Research Report EPR2020008. DOI: 10.4271/EPR2020008
• Wallisch, J., Hann, R. (2020). Design of a Low-Speed Icing Wind Tunnel for UAVs. Deutsche Gesellschaft für Luft- und Raumfahrt. DOI: 10.25967/530188
• Hovenburg, A. R., Andrade, F. A. A., Hann, R., Rodin, C. D., and Johansen, T. A., Storvold, R. (2020). Long Range Path Planning Using an Aircraft Performance Model for Battery Powered sUAS Equipped with Icing Protection System. IEEE Journal on Miniaturization for Air and Space Systems. DOI: 10.1109/JMASS.2020.3003833
• Hann, R., Hearst, R.J., Sætran, L.R., Bacchi, T. (2020). Experimental and Numerical Icing Penalties of an S826 Airfoil at Low Reynolds Numbers. Aerospace, 7(4), 46. [Data] DOI: 10.3390/aerospace7040046
• Narum, E.F.L., Hann, R., Johansen, T.A. (2020). Optimal Mission Planning for Fixed-Wing UAVs with Electro-Thermal Icing Protection and Hybrid-Electric Power Systems.International Conference on Unmanned Aircraft Systems (ICUAS). DOI: 10.1109/ICUAS48674.2020.9214054
•  Cristofaro, A., Rotondo, D., Johansen, T. A. (2020). An unknown input observer-based framework for fault and icing detection and accommodation in overactuated unmanned aerial vehicles, in “Fault Diagnosis and Fault-Tolerant Control of Robotic and Autonomous Systems”, IET
• Vinnes M.K., Hearst, J.R. (2020). Aerodynamics of an airfoil with leading‐edge icing. Wind Energy. 2020; 1– 17. DOI: 10.1002/we.2603

2019

• Hann, R. (2019). UAV Icing: Ice Accretion Experiments and Validation. SAE Technical Paper. No. 2019-01-2037. DOI: 10.4271/2019-01-2037
• Hann, R., Borup, K., Zolich, A., Sorensen, K., Vestad, H., Steinert, M., & Johansen, T.A. (2019). Experimental Investigations of an Icing Protection System for UAVs. SAE Technical Paper. No. 2019-01-2038. DOI: 10.4271/2019-01-2038
• Fajt, N., Hann, R., Lutz, T. (2019). The Influence of Meteorological Conditions on the Icing Performance Penalties on a UAV Airfoil. 8^th European Conference for Aeronautics and Aerospace Sciences (EUCASS). DOI: 10.13009/EUCASS2019-240
• Winter, A., Hann, R., Wenz, A., Gryte, K., & Johansen, T. A. (2019). Stability of a Flying Wing UAV in Icing Conditions. 8^th European Conference for Aeronautics and Aerospace Sciences (EUCASS). DOI: 10.13009/EUCASS2019-906
• Hann, R. (2019). UAV Icing: Comparison of LEWICE and FENSAP-ICE for Anti-Icing Loads. AIAA Scitech Forum. DOI: 10.2514/6.2019-1286
• D. Rotondo, A. Cristofaro, T. A. Johansen, F. Nejjari, V. Puig (2019). Robust fault and icing diagnosis in unmanned aerial vehicles using LPV interval observers, International Journal of Robust and Nonlinear Control, Vol. 29, pp. 5456-5480. DOI: 10.1002/rnc.4381
• A. W. Wenz, T. A. Johansen (2019). Icing Detection for Small Fixed Wing UAVs using Inflight Aerodynamic Coefficient Estimation, IEEE Aerospace Conference, Big Sky, Paper 2636.

2018

• Gryte, K., Hann, R., Alam, M., Roháč, J., Johansen, T. A., Fossen, T. I. (2018). Aerodynamic modeling of the skywalker x8 fixed-wing unmanned aerial vehicle. In 2018 International Conference on Unmanned Aircraft Systems (ICUAS) (pp. 826-835). IEEE. DOI: 10.1109/ICUAS.2018.8453370
• Hann, R. (2018). UAV Icing: Comparison of LEWICE and FENSAP-ICE for Ice Accretion and Performance Degradation. AIAA Atmospheric and Space Environments Conference. DOI: 10.2514/6.2018-2861
• D. Rotondo, A. Cristofaro, T. A. Johansen, F. Nejjari, V. Puig (2018). Diagnosis of icing and actuator faults in UAVs using LPV unknown input observers, Journal of Intelligent & Robotic Systems, Vol. 91, pp 651–665. DOI: 10.1007/s10846-017-0716-1

2017

• Hann, R., Wenz, A., Gryte, K., & Johansen, T. A. (2017). Impact of atmospheric icing on UAV aerodynamic performance. In 2017 Workshop on Research, Education and Development of Unmanned Aerial Systems (RED-UAS) (pp. 66-71). IEEE. DOI: 10.1109/RED-UAS.2017.8101645
• A. Cristofaro, A. P. Aguiar, T. A. Johansen (2017). Icing Detection and Identification for Unmanned Aerial Vehicles using Adaptive Nested Multiple Models, International Journal of Adaptive Control and Signal Processing, Vol. 31, pp. 1584–1607. DOI: 10.1002/acs.2787
• D. Rotondo, A. Cristofaro, V. Hassani, T. A. Johansen (2017). Icing diagnosis in unmanned aerial vehicles using an LPV multiple model estimator, IFAC World Congress, Toulouse.
• K. L. Sørensen, T. A. Johansen (2017). Flight Test Results for Autonomous Icing Protection Solution for Small Unmanned Aircraft, Int. Conf. Unmanned Aircraft Systems, Miami.

2016

• D. Rotondo, A. Cristofaro, T. A. Johansen, F. Nejjari, V. Puig, Detection of icing and actuators faults in the longitudinal dynamics of small UAVs using an LPV proportional integral unknown input observer, 3rd Conference on Control and Fault-Tolerant Systems, Barcelona, 2016
• A. W. Wenz, T. A. Johansen, Icing detection for small fixed wing UAVs using inflight aerodynamic coefficient estimation, IEEE Multi-Conference on Systems and Control, Buenos Aires, 2016
• A. Cristofaro, T. A. Johansen, An unknown input observer based control allocation scheme for icing diagnosis and accommodation in overactuated UAVs, European Control Conference, Aalborg, 2016

2015

• M. M. Seron, T. A. Johansen, J. De Dona, A. Cristofaro (2015). Detection and Estimation of Icing in Unmanned Aerial Vehicles using a Bank of Unknown Input Observers, Australian Control Conference.
• D. Rotondo, A. Cristofaro, T. A. Johansen, F. Nejjari, V. Puig (2015). Icing detection in unmanned aerial vehicles with longitudinal motion using an LPV unknown input observer, IEEE Multi-Conference on Systems and Control, Sydney. DOI: 10.1109/CCA.2015.7320740
• K. L. Sørensen, M. Blanke, T. A. Johansen (2015). Diagnosis of Wing Icing Through Lift and Drag Coefficient Change Detection for Small Unmanned Aircraft, Proc. 9th IFAC Symposium on Fault Detection, Supervision and Safety of Technical Processes, Paris.
• A. Cristofaro, T. A. Johansen, A. Pedro Aguiar, Icing Detection and Identification for Unmanned Aerial Vehicles: Multiple Model Adaptive Estimation, European Control Conference, Linz. DOI: 10.1109/ECC.2015.7330774
• A. Cristofaro, T. A. Johansen (2015). An unknown input observer approach to icing detection for unmanned aerial vehicles, American Control Conference, Chicago. DOI: 10.1109/ACC.2015.7170736
• A. Cristofaro, T. A. Johansen (2015). An unknown input observer approach to icing detection for unmanned aerial vehicles, American Control Conference, Chicago. DOI: 10.1109/ACC.2015.7170736
• K. L. Sørensen, A. S. Helland, T. A. Johansen (2015). Carbon Nanotube Based Airfoil Heating System for In-Flight Anti-Icing and De-Icing of UAVs, IEEE Aerospace Conference, Big Sky. DOI: 10.1109/AERO.2015.7119206

PhD

• Hann, R. (2020). Atmospheric Ice Accretions, Aerodynamic Icing Penalties, and Ice Protection Systems on Unmanned Aerial Vehicles. PhD Thesis NTNU2020:200, Norwegian University of Science and Technology.
• Sørensen, K.L. (2016). Autonomous Icing Protection Solution for Small Unmanned Aircraft: An Icing Detection, Anti-Icing and De-Icing Solution. PhD Thesis NTNU2016:275, Norwegian University of Science and Technology.

MSc

• Johannes Oswald, UAV Icing: Numerical and Experimental Study of Performance Penalties on an RG-15 Airfoil, master thesis, 2021, NTNU / Uni Stuttgart / VKI.
• Nicolas Müller, Numerical simulation of the ice accretion on a propeller of a small fixed-wing UAV, master thesis, 2020, NTNU / Uni Stuttgart.
• Edvard Frimann Løes Narum, Mission planning for fixed-wing UAVs in wind and icing conditions, master thesis, 2020, NTNU.
• Joachim Wallisch, Design of a low-speed icing wind tunnel for UAVs, master thesis, 2020, NTNU / Uni Stuttgart.
• Nicolas Fajt, The Influence of Meteorological Conditions on the Icing Performance Penalties on a UAV Airfoil, master thesis, 2019, NTNU / Uni Stuttgart.
• Adrian Winter, Systems Identification, Flight Performance, and Control of a Fixed-Wing UAV in Icing Conditions, master thesis, 2019, NTNU / Uni Stuttgart.
• Julie Krøgenes, Aerodynamic Performance of the NREL S826 Airfoil in Icing Conditions, master thesis, 2017, NTNU.
• Lovisa Brandrud, Aerodynamic Performance of the NREL S826 Airfoil in Icing Conditions, master thesis, 2017, NTNU.