Blar i NTNU Open på forfatter "Hann, Richard"
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20th International Workshop on Atmospheric Icing of Structures (IWAIS 2024) Conference Proceedings
Virk, Muhammad Shakeel; Nygaard, Bjørn Egil; Pettersen, Jan-Arne; Olsen, Margrethe Grundstad; Kvernelv, Wenche Lisbeth Berg; Khawaja, Hassan Abbas; Sveen, Svein-Erik; Han, Xingbo; Lotfi, Arefeh; Fikke, Svein Magnus; Holdø, Arne Erik; Adeel, Yousuf; Adum, Boris; Yin, Fanghui; Momen, Gelareh; Qin, Hu; Hui, Hu; Gutman, Igor; Jin, Jia Yi; Kollár, László; Huang, Mingfeng; Muhammed, Manaf; Badran, Omar; Sokolov, Pavlo; Hann, Richard; Farokhi, Shahab; Karlsson, Timo; Janjua, Zaid Ayaz; Farzaneh, Masoud; Mitten, Paul; Jiang, Xingliang; Huang, Xinbo; Šabata, Jaroslav; Makkonen, Lasse; Bodo, Wichura; Eliasson, Árni Jón; Kimura, Shigeo; Ozeki, Toshihiro; Chereshnyuk, Sergej; Jones, Kathleen; Lacavalla, Matteo (Book, 2024) -
Aerodynamic modeling of the Skywalker X8 Fixed-Wing Unmanned Aerial Vehicle
Gryte, Kristoffer; Hann, Richard; Alam, Mushfiqul; Rohac, Jan; Johansen, Tor Arne; Fossen, Thor I. (Chapter, 2018)With advanced control, estimation and simulation requirements in unmanned aerial systems comes the need for sophisticated aerodynamic models. This paper reviews two common means for establishing such models; numerical ... -
Aerodynamic roughness length of crevassed tidewater glaciers from UAV mapping
Dachauer, Armin; Hann, Richard; Hodson, Andrew (Peer reviewed; Journal article, 2021)The aerodynamic roughness length (z0) is an important parameter in the bulk approach for calculating turbulent fluxes and their contribution to ice melt. However, z0 estimates for heavily crevassed tidewater glaciers are ... -
Atmospheric Ice Accretions, Aerodynamic Icing Penalties, and Ice Protection Systems on Unmanned Aerial Vehicles
Hann, Richard (Doctoral theses at NTNU;2020:200, Doctoral thesis, 2020)This thesis focused on atmospheric ice accretions, aerodynamic icing penalties, and ice protection systems (IPS) on fixed-wing unmanned aerial vehicles (UAVs). The motivation for this work was to increase the knowledge ... -
CFD Icing Simulations on a Fixed-wing UAV Engine Inlet
Wurst, Lukas; Wallisch, Joachim; Hann, Richard (Chapter, 2023)Unmanned aerial vehicles (UAVs), or drones, are increasingly used in diverse commercial and military applications. Ensuring their reliability is crucial to prevent endangering mission targets, people, and infrastructure. ... -
Derivation of flow rate and calibration method for high-volume air samplers
Hann, Richard; Hermanson, Mark H (Journal article; Peer reviewed, 2019)High-volume air sampling is a key measurement technique for investigating the concentration of atmospheric pollutants. Despite being a mature technique, a detailed description of how to derive flow rates and how to calibrate ... -
Experimental and numerical icing penalties of an S826 airfoil at low Reynolds numbers
Hann, Richard; Hearst, R. Jason; Sætran, Lars Roar; Bracchi, Tania (Peer reviewed; Journal article, 2020)Most icing research focuses on the high Reynolds number regime and manned aviation. Information on icing at low Reynolds numbers, as it is encountered by wind turbines and unmanned aerial vehicles, is less available, and ... -
Experimental Investigations of an Icing Protection System for UAVs
Hann, Richard; Borup, Kasper Trolle; Zolich, Artur Piotr; Sørensen, Kim Lynge; Vestad, Håvard Nitter; Steinert, Martin; Johansen, Tor Arne (Journal article; Peer reviewed, 2019)UAV icing is a severe challenge that has only recently shifted into the focus of research. Today, there are no mature icing mitigation technologies for UAVs, except for the largest fixed-wing drones. We are working on the ... -
Experimental Investigations of an Icing Protection System for UAVs
Hann, Richard; Borup, Kasper Trolle; Zolich, Artur Piotr; Sørensen, Kim Lynge; Vestad, Håvard Nitter; Steinert, Martin; Johansen, Tor Arne (Journal article; Peer reviewed, 2019) -
Flow Structure around a Multicopter Drone: A Computational Fluid Dynamics Analysis for Sensor Placement Considerations
Ghirardelli, Mauro; Kral, Stephan Thomas; Müller, Nicolas Carlo; Hann, Richard; Cheynet, Etienne; Reuder, Joachim (Peer reviewed; Journal article, 2023)This study presents a computational fluid dynamics (CFD) based approach to determine the optimal positioning for an atmospheric turbulence sensor on a rotary-wing uncrewed aerial vehicle (UAV) with X8 configuration. The ... -
Historic Atmospheric Organochlorine Pesticide and Halogenated Industrial Compound Inputs to Glacier Ice Cores in Antarctica and the Arctic
Hermanson, Mark H.; Isaksson, Elisabeth; Hann, Richard; Ruggirello, Rachel M.; Teixeira, Camilla; Muir, Derek C.G. (Journal article; Peer reviewed, 2021)Ice cores collected from polar ice sheets at Site M, Dronning Maud Land, East Antarctica (Lat 75.00 S, Long 15.00 E), and Holtedahlfonna, Svalbard (Lat 79.13 N, Long 13.27 E), were analyzed for a net deposition of 25 ... -
How Many Reindeer? UAV Surveys as an Alternative to Helicopter or Ground Surveys for Estimating Population Abundance in Open Landscapes
Paulsen, Ingrid M.; Pedersen, Åshild Ø; Hann, Richard; Blanchet, Marie-Anne; Eischeid, Isabell; van Hazendonk, Charlotte Maartje; Ravolainen, Virve; Stien, Audun; Le Moullec, Mathilde (Peer reviewed; Journal article, 2023)Conservation of wildlife depends on precise and unbiased knowledge on the abundance and distribution of species. It is challenging to choose appropriate methods to obtain a sufficiently high detectability and spatial ... -
Ice Accretion: Image Post-Processing Measurement Techniques for 2D Ice Shapes
Enache, Adriana; Wallisch, Joachim; Van Beeck, Jeroen; Hendrick, Patrick; Hann, Richard (Peer reviewed; Journal article, 2023)Ice accretion poses substantial safety hazards for the manned and unmanned aviation industries. Its study is essential for icing events risk assessment and for the development of efficient ice protection systems. The ... -
Impact of Atmospheric Icing on UAV Aerodynamic Performance
Hann, Richard; Wenz, Andreas Wolfgang; Gryte, Kristoffer; Johansen, Tor Arne (Chapter, 2017)This paper presents a first assessment on the impact of atmospheric icing on the aerodynamic performance of fixed-wing UAVs. Numerical simulations were performed in order to evaluate the impact on lift and drag on a 2D ... -
Inner Loop Adaptive Control of Fixed-Wing Unmanned Aerial Vehicles in Icing Conditions
Högnadóttir, Sif (Master thesis, 2022)Motivert av økende bruk av små ubemannede luftfartøy utforsker denne oppgaven bruken av MRAC (model reference adaptive control), en type adaptiv regulator, og sammenligner det mot konvensjonelle PID-regulatorer. Begge ... -
Long range path planning using an aircraft performance model for battery powered sUAS equipped with icing protection system
Hovenburg, Anthony Reinier; Andrade, Fabio; Hann, Richard; Rodin, Christopher D; Johansen, Tor Arne (Journal article, 2020)Earlier studies demonstrate that en-route atmospheric parameters, such as winds and icing conditions, significantly affect the safety, and in-flight performance of unmanned aerial systems. Nowadays, the inclusion of ... -
Mission Planning for Fixed-wing UAVs in Wind and Icing Conditions
Narum, Edvard Frimann Løes (Master thesis, 2020)Sterk vind og isete forhold er blant de største utfordringene rundt bruk av ubemmanede småfly over lengre distanser. Kjennskap til konkrete værforhold i området der flyvningen skal foregå, gir muligheten til å minimere de ... -
Modeling and identification of a small fixed-wing UAV using estimated aerodynamic angles
Løw-Hansen, Bogdan; Hann, Richard; Gryte, Kristoffer; Johansen, Tor Arne; Deiler, Christoph (Journal article; Peer reviewed, 2025)This paper presents an experimental study on developing and validating a simulation-ready aerodynamic model for the Skywalker X8 unmanned aerial vehicle (UAV) using a hybrid output error method (OEM). Building on previous ... -
Optimal Mission Planning for Fixed-Wing UAVs with Electro-Thermal Icing Protection and Hybrid-Electric Power Systems
Narum, Edvard Frimann Løes; Hann, Richard; Johansen, Tor Arne (Chapter, 2020)Harsh weather conditions such as wind and icing are severe debilitators to the operations of unmanned aerial vehicles in terms of performance, safety and reliability. Forecasts of atmospheric parameters in the mission area ... -
Path Planning for Fixed-Wing UAVs in Wind and Icing Conditions
Tiller, Mikkel (Master thesis, 2021)Ubemannede fly (UAV) har en rekke anvendelser, som levering av varer, kartlegging, og søk og redning i områder som er utilgjengelige for mennesker. Det er imidlertid flere utfordringer knyttet til utbredt bruk av UAV-er ...