Sökning: "propellrar"

Visar resultat 1 - 5 av 22 uppsatser innehållade ordet propellrar.

  1. 1. Electric Propulsion for a High Altitude Unmanned Aerial Vehicle

    Kandidat-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Jacob Hjort Friderichsen; David Jönsson; [2022]
    Nyckelord :Electric Propulsion; UAV; ALPHA; Electronic Speed Controller; BLDC Motor; Propeller;

    Sammanfattning : The catalogue of observational platforms for space and atmospheric research can be expanded by utilising drones equipped with specialised instrumentation and capable of flying at high altitudes. In this project the requirements for an electric propulsion system applicable to the KTH Royal Institute of Technology ALPHA project are evaluated. LÄS MER

  3. 2. Development and study of noise generation from propellers

    Master-uppsats, KTH/Lättkonstruktioner, marina system, flyg- och rymdteknik, rörelsemekanik

    Författare :Anton Anton Dunström; Fredrik Skjernov; [2022]
    Nyckelord :Silent propellers; Propeller development; Noise generation; Skew angle; Blade Area Ratio; Openprop; NATO STANAG no. 1136; Swedish defense and Research Agency FOI ; James Fisher Defense.; Tysta propellrar; Propellerutveckling; Ljudskapande; Skevningsvinkel; Bladtäckningsarea; Openprop; NATO STANAG no. 1136; FOI; James Fisher Defense.;

    Sammanfattning : Noise generation from underwater activities propagates into the marine environment.For marine vessels the propulsion system generates the most noise during itsoperations. Naval vessels that want to operate without being detected want to controlthe sound generating properties of the vessel. LÄS MER

  4. 3. 3D obstacle avoidance for drones using a realistic sensor setup

    Master-uppsats, KTH/Robotik, perception och lärande, RPL

    Författare :Thor Stefansson; [2018]
    Nyckelord :robotics; drones; unmanned aerial vehicle; obstacle avoidance; 3D; realistic sensor setup; depth camera; lidar; obstacle restriction method; ORM; indoors;

    Sammanfattning : Obstacle avoidance is a well researched area, however most of the works only consider a 2D environment. Drones can move in three dimensions. It is therefore of interest to develop a system that ensures safe flight in these three dimensions. LÄS MER

  5. 4. Regression Models of 3D Wakes for Propellers

    Master-uppsats, Karlstads universitet/Institutionen för ingenjörsvetenskap och fysik (from 2013)

    Författare :Christian Karlsson; [2018]
    Nyckelord :Propeller design; Wake; Velocity distribution; Regression analysis; Fourier series; Skewed-Gaussians; Coherent structure coloring; Propeller design; Medströmsfält; Hastighetsfördelning; Regressionsanalys; Fourierserier; Skeva-Gaussfördelningar; Koherenta struktureringsfärgmetoden;

    Sammanfattning : In this work, regression models for the wake field entering a propeller at certain axial andnominal position have been proposed. Wakes are non-uniform flows following a body immersedin a viscous fluid. We have proposed models for the axial and tangential velocity distribution asfunctions of ship hull and propeller measures. LÄS MER

  7. 5. Examination and Design of Propeller Configurations foran Electrically Powered Hydrofoil Vehicle

    Master-uppsats, KTH/Marina system

    Författare :Joakim Wallberg; [2018]
    Nyckelord :;

    Sammanfattning : The thesis examines propeller configurations for the propulsion system for the water mode in the amphibious craft concept Newt, which also includes contra-rotating propellers. Newt is a research project on innovative commuter vehicles carried out by the naval architecture department at KTH. LÄS MER