Sökning: "S-N curve"

Visar resultat 1 - 5 av 10 uppsatser innehållade orden S-N curve.

  1. 1. Minimizing Transformer No-Load Losses at Hydropower Plants : A Study of Effects from Transformer Switch-Off During Stand-by Operation

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Institutionen för elektroteknik

    Författare :Elin Luedtke; [2021]
    Nyckelord :step-up transformer; transformer switch-off; stand-by operation; idle operation; transformer winding; inrush current; fatigue stress; fatigue failure; S-N curve; transformer thermal cycling; thermal time constant; saving potential in hydropower; hydropower plant;

    Sammanfattning : Hydropower is the most important power balancing resource in the Swedish electrical power system, regulating the power supply to match the load. Consequently, several hydropower plants have periods of stand-by operation where the power production is absent but where several devices within a plant are still active. LÄS MER

  2. 2. The influence of microstructural features on the mechanical properties of Magsimal®-59

    Uppsats för yrkesexamina på avancerad nivå, Jönköping University/Tekniska Högskolan

    Författare :Robert Fabian; [2021]
    Nyckelord :Magsimal-59; aluminum alloy; mechanical properties; microstructural features; secondary dendrite arm spacing; mean stress sensitivity; S-N curve; alloying additons; as-cast state;

    Sammanfattning : .... LÄS MER

  3. 3. Development of a Beam for a Vibration Motor

    Kandidat-uppsats, Högskolan i Skövde/Institutionen för ingenjörsvetenskap; Högskolan i Skövde/Institutionen för ingenjörsvetenskap

    Författare :Kalle Nysell; Charlie Adam; [2021]
    Nyckelord :Finite element method; CAD; Inventor; mechanics; strength of materials; stress; development; design; Autodesk; Nastran; screen machine; material fatigue;

    Sammanfattning : This project is centered around the use of finite element analysis for developing a beam for a new type of motor used in a screening machine. Essentially the main purpose of the developed beam is to transfer vibrations to the screen machine that it will be attached to. LÄS MER

  4. 4. Analysis of uncertainties in fatigue load assessment : a study on one Kaplan hydro turbine during start operation

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

    Författare :Annica Gustafsson; [2019]
    Nyckelord :Hydropower; Hydro turbine runner; Uncertainty analysis; Fatigue load; Fatigue damage; Propagation of uncertainty.; Vattenkraft; Löphjul; Osäkerhetsanalys; Utmattning; Delskada; Fortplantning av osäkeheter.;

    Sammanfattning : In the future, hydropower plants are expected to operate more flexibly. This will lead to a more varied operation of the turbine and the generator, such as more start and stop in order to stabilise the frequency in the grid. Studies show that these transient operations are more costly in terms of fatigue degradation, i.e. LÄS MER

  5. 5. Fatigue Life Analysis of Weld Ends : Using FE-Calculations and Mechanical Testing

    Master-uppsats, Blekinge Tekniska Högskola/Institutionen för maskinteknik

    Författare :Victor Ljungdahl; [2018]
    Nyckelord :Comparison; Effective notch method; Testing; Weld End; Jämförelse; Effective notch metoden; Provning; Svetslut;

    Sammanfattning : Fatigue life estimation of welds is a complex issue since the characteristics of each weld are unique depending on load case, geometry and properties. Fatigue life estimation on weld ends is limited and often the weakest point of a weld. LÄS MER