Browsing NTNU Open by Author "Hann, Richard"

Now showing items 1-20 of 28

    • 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 ...

    • 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 ...

    • SIOS’s Earth Observation (EO), Remote Sensing (RS), and operational activities in response to COVID-19 

      Jawak, Shridhar D.; Andersen, Bo N.; Pohjola, Veijo; Godøy, Øystein; Hübner, Christiane E.; Jennings, Inger; Ignatiuk, Dariusz; Holmen, Kim; Sivertsen, Agnar; Hann, Richard; Tømmervik, Hans; Kääb, Andreas; Błaszczyk, Małgorzata; Salzano, Roberto; Luks, Bartłomiej; Høgda, Kjell Arild; Storvold, Rune; Nilsen, Lennart; Salvatori, Rosamaria; Krishnan, Kottekkatu Padinchati; Chatterjee, Sourav; Lorentzen, Dag Arne; Erlandsson, Rasmus; Lauknes, Tom Rune; Malnes, Eirik; Karlsen, Stein Rune; Enomoto, Hiroyuki; Fjæraa, Ann Mari; Zhang, Jie; Marty, Sabine; Nygård, Knut Ove; Lihavainen, Heikki (Peer reviewed; Journal article, 2021)
      Svalbard Integrated Arctic Earth Observing System (SIOS) is an international partnership of research institutions studying the environment and climate in and around Svalbard. SIOS is developing an efficient observing system, ...

    • UAV Icing: A Performance Model for a UAV Propeller in Icing Conditions 

      Müller, Nicolas Carlo; Hann, Richard; Johansen, Tor Arne (Chapter, 2022)
      In-flight icing on unmanned aerial vehicles is a severe hazard and imposes limits on the operational envelope. Icing has been shown to lead to substantial aerodynamic performance losses on lifting surfaces and propellers. ...