Sökning: "rudder forces"

Visar resultat 1 - 5 av 10 uppsatser innehållade orden rudder 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. Primary flight control design for a 4-seat electric aircraft

    Master-uppsats, KTH/Flygdynamik

    Författare :Cyril Lachaume; [2021]
    Nyckelord :Flight control; Kinematics; Aircraft; Mechanics; Hybrid electric; Flygkontroll; kinematik; flygplan; mekanik; hybridelektrisk;

    Sammanfattning : This thesis work is part of a design process which aims to develop a four-seathybrid-electric aircraft at Smartflyer (Grenchen, Switzerland). In that scope,various mechanisms of the plane had to be developed, including the systemactuating the control surfaces. LÄS MER

  4. 3. Optimal configuration of the mechanical structure and flap actuator for hydrofoils

    Master-uppsats, KTH/Maskinkonstruktion (Avd.)

    Författare :Stanislav Minko; [2019]
    Nyckelord :;

    Sammanfattning : Hydrofoil vessels are becoming more popular and driving marine development forward. Since the water friction is greatly reduced, they allow achieving higher speeds and electrification of the boats. FoilCart is a full electric active controlled hydrofoil boat designed as a research project at KTH. LÄS MER

  5. 4. 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

  7. 5. Utveckling och validering av propellermodell baserat på rörelsemängdskälla för ett friströmningsfall

    Master-uppsats, Karlstads universitet/Fakulteten för hälsa, natur- och teknikvetenskap (from 2013)

    Författare :Linus Zimmerman; [2015]
    Nyckelord :CFD; propeller; simulering;

    Sammanfattning : Propellersimulering genom Computational Fluid Dynamics (CFD) används mer och mer i ett tidigt designstadium gällande fartygs framdrift. Rolls-Royce Hydrodynamic Research Centre har lång erfarenhet av propellerdesign och analysarbete genom både modelltester och numerisk simulering, och CFD används idag för ett flertal olika tillämpningar och syften. LÄS MER