Search for dissertations about: "propeller"

Showing result 11 - 15 of 72 swedish dissertations containing the word propeller.

  2. 11. Investigation on Propeller-Rudder Interaction by Numerical Methods

    Author : Da-Qing Li; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : The axial forces in a propeller-rudder interactive system working in uniform flow are theoretically studied: In a steady linear method the propeller is represented by bound and free vortex systems, the rudder by vortex and source filaments and the rudder wake by free vortex filaments. A lifting-line analysis method predicts the propeller characteristics. READ MORE

  4. 12. Numerical Prediction of Propeller Induced Hull Pressure Pulses

    Author : Muye Ge; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cavitation; Pressure pulses; RANS; OpenFOAM; Star-CCM ;

    Abstract : Ship propeller induced pressure pulses is one of the major sources of both onboard noise and vibration as well as underwater radiated noise. The need for accurate pressure pulse prediction is increasing due to rising concerns of environmental impacts and comfort and welfare of passengers and crews. READ MORE

  5. 13. Active Control of Propeller-Induced Noise in Aircraft : Algorithms & Methods

    Author : Sven Johansson; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; active control of sound; active noise control; anc; actuator individual normalized filtered-x lms; filtered-x lms algorithm; newton algorithm; complex lms; multireference algorithm; leaky lms; control effort weighting; feedforward control; feedback contro;

    Abstract : In the last decade acoustic noise has become more and more regarded as a problem. In cars, boats, trains and aircraft, low-frequency noise reduces comfort. Lightweight materials and more powerful engines are used in high-speed vehicles, resulting in a general increase in interior noise levels. READ MORE

  6. 14. PIV measurement in a down-scale propeller turbine

    Author : Nahale Sotoudeh; Pål-Tore Selbo Storli; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Abstract : Renewable energy has been demonstrated to be an efficient energy production technique worldwide. Due to the geographical location of Sweden, running water has been used as a widely accessible and clean renewable source of energy for power production. READ MORE

  7. 15. Force and Flow Characteristics of a Partially Submerged Propeller

    Author : Niclas Olofsson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; partially submerged propellers; performance prediction theory; inclined propellers; dynamic blade loads; yawed propellers; blade vibration;

    Abstract : Model experiments have been conducted to determine the average and dynamic performance of a high-speed partially submerged propeller. The purpose of the experiments was to examine the influence of shaft yaw and inclination angles on the propeller characteristics at different Froude and cavitation numbers and to study the flow around the propeller blades in different conditions. READ MORE