Sökning: "propeller forces"

Visar resultat 1 - 5 av 13 uppsatser innehållade orden propeller forces.

  1. 1. Real-time Optimal Braking for Marine Vessels with Rotating Thrusters

    Master-uppsats, KTH/Matematik (Avd.)

    Författare :Sigurlaug Rún Jónsdóttir; [2022]
    Nyckelord :Nonlinear optimization; nonlinear optimal control; numerical optimal control; real-time solution; optimal braking; receding horizon; modeling; ship model; propeller forces; rudder forces; direct multiple shooting method; discretization;

    Sammanfattning : Collision avoidance is an essential component of autonomous shipping. As ships begin to advance towards autonomy, developing an advisory system is one of the first steps. An advisory system with a strong collision avoidance component can help the crew act more quickly and accurately in dangerous situations. LÄS MER

  3. 2. Sharkbait - A self-stabilising underwater drone : Evalution of response time, propulsion and steering in a underwater environment

    Kandidat-uppsats, KTH/Skolan för industriell teknik och management (ITM)

    Författare :Victor Hanefors; Shaya Rahmanian; [2019]
    Nyckelord :Mechatronics; Drone; Underwater; Self-stabilisation; Mekatronik; Drönare; Undervatten; Självstabiliserande;

    Sammanfattning : This projects purpose was to build an underwater remote operated vehicle with software controlled self-stabilisation for evaluation of the response time, propulsion and steering to see what could be achieved. A prototype was constructed and tested in dry conditions at first. LÄS MER

  4. 3. Development of concept for silent UAV propulsion

    Master-uppsats, KTH/Maskinkonstruktion (Inst.)

    Författare :Filip Sjöö; Ingemar Jönsson; [2018]
    Nyckelord :UAV; circulation control; propeller; boundary layer separation; noise reduction; multirotor; gränsskikt; avlösning; ljudreduktion; propeller;

    Sammanfattning : Eftersom användningen av små UAV:s (Unmanned Aerial Vehicles) fortsätter att öka, harbullret från deras framdrivningssystem blivit ett ökande problem. Denna rapport är resultatetav ett masterprojekt med målet att utveckla en framdrivningsmetod med låga bullernivåerför små UAV:s. LÄS MER

  5. 4. A CFD Analysis of Cyclodial Propellers

    Master-uppsats, Linköpings universitet/Mekanisk värmeteori och strömningslära

    Författare :Fredrik Thelin; [2017]
    Nyckelord :CFD; Fluid mechanics; Propeller; Ship propulsion;

    Sammanfattning : The quest for more efficient machines is always ongoing in the engineering world. This project is no different. ABB are investigating a new type of propeller that seems to offer increased efficiency compared to normal screw propellers. That is a so called foil wheel propeller. LÄS MER

  7. 5. Accuracy of transient versus steady state forces on a rudder operating in a propeller slipstream

    Uppsats för yrkesexamina på avancerad nivå, Umeå universitet/Institutionen för fysik

    Författare :Erik Löfgren; [2015]
    Nyckelord :Unsteady flows; rudders; propellers; fluid mechanics; performance prediction; unsteady aerofoils;

    Sammanfattning : In computational fluid dynamics (CFD), a transient simulation is in general more costly than computing the steady state of the system, if such a state exists. The velocity field produced by the propeller blades upstream of a rudder is transient in nature, and rudder design using CFD may therefore become very time-consuming. LÄS MER