Sökning: "Wind stress"

Visar resultat 31 - 35 av 52 avhandlingar innehållade orden Wind stress.

  1. 31. The Representation of Atmospheric Boundary Layer Processes in Global Climate Models

    Författare :Jenny Lindvall; Gunilla Svensson; Rodrigo Caballero; Andrew R. Brown; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; The atmospheric boundary layer; Global climate models; Diurnal cycle; Flux towers; Diurnal temperature range; atmosfärvetenskap och oceanografi; Atmospheric Sciences and Oceanography;

    Sammanfattning : The atmospheric boundary layer is the lowest part of the atmosphere, which is in direct contact with the surface. It is here, in this turbulent layer, that the exchange of heat, moisture and momentum between the surface and the atmosphere takes place. LÄS MER

  3. 32. Development and characteristics of a fully recycled CF/PP composite

    Författare :Magdalena Szpieg; Geoff Gibson; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Polymera konstruktionsmaterial; Polymeric Composite Materials;

    Sammanfattning : The increasing industrial use of carbon fibre in e.g. aircraft and wind turbines calls for strategies for their recovery and possible reuse. In addition, tremendous amount of energy is needed to be able to manufacture pristine carbon fibres. LÄS MER

  4. 33. Fracture Mechanics in Design and Assessment of Existing Structures: Two Case Studies

    Författare :Pourya Noury; Raid Karoumi; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Steel Structures; Stålbyggnad;

    Sammanfattning : In the present thesis, the application of fracture mechanics in design and assessment of steel structures has been studied.The first case study concerns a ring-flange connection used in wind turbine towers. The flange is rolled from straight steel profile into a complete ring. LÄS MER

  5. 34. Electrical Characterisations of Bearings

    Författare :Abhishek Joshi; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ball bearing; Equivalent circuit model; Lubricants; Bearing Capacitance; Spherical bearing; Mechanical bearing; Bearing currents; Electrical conduction; Electrical characterisation;

    Sammanfattning : Mechanical bearings are an integral part of industry, and are used in various places in order to reduce friction between two interacting surfaces and are used to transmit power and loads. Mechanical bearings are one of the most extensively used components within the wind industry, but on the other hand they are also one of the most dominantly failing failed components. LÄS MER

  7. 35. Studies of Transient and Pulsating flows with application to Hydropower

    Författare :Joel Sundström; Michel Cervantes; Mehdi Seddighi; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Turbulent flows; Pipe flow; Unsteadiness; Friction modeling; Strömningslära; Fluid Mechanics;

    Sammanfattning : The rotational motion of a hydraulic turbine runner makes pulsating flows ubiquitous in different locations of the machine. The cyclic loading thus induced may generate large pressure forces acting periodically on both stationary and rotating parts. LÄS MER