Sökning: "Dynamic load"

Visar resultat 36 - 40 av 426 uppsatser innehållade orden Dynamic load.

  1. 36. Evaluation of Coefficient of Friction in Oblique Helmet Impacts: An Experimental and Numerical Study

    Master-uppsats, KTH/Hållfasthetslära

    Författare :Philip Singh; [2022]
    Nyckelord :FE model; friction; helmet impact; LS-DYNA; FE-modell; friktion; hjälmislag; LS-DYNA;

    Sammanfattning : The focus of this thesis was to increase the knowledge in the area of "dynamic friction" during oblique helmet impacts, both experimentally and numerically. Physical experiments have been performed with multiple helmets, different angles of the anvil and different surface materials, with results of impact forces from the anvil and accelerations of the head. LÄS MER

  3. 37. Fallviktsförsök på skjuvarmerade betongbalkar

    Kandidat-uppsats, KTH/Byggteknik och design

    Författare :Louise Atterling; My Widmark; [2022]
    Nyckelord :Concrete beams; impact load; dynamic load; shear reinforcement; shock load; vibrations; signals;

    Sammanfattning : Standards and regulations for dimensioning of load-bearing structures are based on the response of load-bearing structures subjected to loads without variation in time. In the event of an accidental load, e.g. a collision or explosion, causes the load to have a rapid variation in the time resulting in a dynamic response. LÄS MER

  4. 38. Analys av hur spänningen i förspända skruvförband påverkas av belastningar

    M1-uppsats, Högskolan i Gävle/Maskinteknik

    Författare :Emil Gutå; Gustav Rytkönen; [2022]
    Nyckelord :;

    Sammanfattning : This study is a thorough analysis of how the bolt pretension of a clamped mount changes underexternal loads. The analyzed mount is named 3611 in MAFI’s product catalog. The purpose of thisstudy was to ensure that the bolt pretension remains within acceptable values and thereby minimizingthe risk of unexpected failures. LÄS MER

  5. 39. Design and evaluation of a shock load resistant dynamic chain plate

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Författare :Daniel Olsson; [2022]
    Nyckelord :Dynamic; chain; shock load; Simulink; FEA; conveyor; wear; experimental; Nordic Quick Systems; chain plate; Simulation; FEM;

    Sammanfattning : Conveyor chains are often subject to repetitive shock loads during normal operations. This can cause accelerated wear in the chain leading to premature chain replacementor chain failure (Otoshi, 1997, p. 4). In this thesis a new approach for reducingshock load related wear in conveyor chains is proposed. LÄS MER

  7. 40. Hydrogen Fuel Cell Lifetime Simulation in Marine Applications

    Master-uppsats, KTH/Kraft- och värmeteknologi

    Författare :Yifeng Zhong; [2022]
    Nyckelord :maritime transportation; FEMFC; lifetime simulation; degradation mechanism; empirical relationship; semi-empirical approach; sjötransport; PEM-bränsleceller; livslängdssimulering; nedbrytningsmekanism; empiriskt samband; semi-empiriskt tillvägagångssätt;

    Sammanfattning : Maritime transportation emits about 3% of global greenhouse gas, International Maritime Organization (IMO) aims to reduce shipping’s emissions by 50% with respect to 2008 levels. Proton exchange membrane fuel cells (PEMFCs) are considered among the most promising clean technologies for decarbonizing the maritime sector. LÄS MER