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Hittade 5 uppsatser som matchar ovanstående sökkriterier.

  1. 1. Comparison of Fatigue Life Evaluation Methods

    Master-uppsats, KTH/Hållfasthetslära

    Författare :Louise Hedberg Lundblad; Anna Lund; [2021]
    Nyckelord :Solid Mechanics; Fatigue; Time history methods; Spectral methods; Truck components; Road induced vibrations; Hållfasthetslära; Utmattning; Tidshistoriksmetoder; Spektrala metoder; Lastbilskomponenter; väginducerade vibrationer;

    Sammanfattning : The aim of this thesis is to investigate a selected set of fatigue life calculation methods and evaluate if they are suitable for fatigue life estimation of truck components at Scania. Failure due to fatigue can be cause by road induced vibrations, which is an inevitable phenomenon trucks are exposed to. LÄS MER

  3. 2. Transient and Spectral Fatigue Analysis for Random Base Excitation

    H-uppsats,

    Författare :Albin Bäckstrand; Prithviraj Madhava Acharya; [2019-09-16]
    Nyckelord :Spectral fatigue analysis; transient fatigue analysis; power spectral density PSD ; transfer function; base excitation; Dirlik s empirical formula; equivalent von Mises stress EVMS ; rainflow count; Wang and Brown s method; Dang Van equivalent stress; Palmgren-Miner rule;

    Sammanfattning : This thesis work gives an insight on how to estimate the fatigue damage using transient and spectral fatigue analysis for both uniaxial and multiaxial stress states in case of random vibration base excitation. The transient method involves a rainflow count algorithm that counts the number of cycles causing the fatigue damage, while the spectral method is based on probabilistic assumptions from which an expected value of fatigue damage can be estimated. LÄS MER

  4. 3. Study of Vibration Transmissibility of Operational Industrial Machines

    Master-uppsats, Blekinge Tekniska Högskola/Institutionen för tillämpad signalbehandling

    Författare :Sindhura Chilakapati; Sri Lakshmi Jyothirmai Mamidala; [2016]
    Nyckelord :Noise and Vibration; Spectral estimation; Vibration isolation; Vibration transfer;

    Sammanfattning : Industrial machines during their operation generate vibration due to dynamic forces acting on the machines. This vibration may create noise, abrasion in the machine parts, mechanical fatigue, degrade performance, transfer to other machines via floor or walls and may cause complete shutdown of the machine. LÄS MER

  5. 4. Extreme loading and fatigue analysis of a wave energy device

    Master-uppsats, KTH/Marina system

    Författare :Egil Gustafsson; [2016]
    Nyckelord :Renewable energy; wave power; wave energy device; wave energy converter; wave scatter;

    Sammanfattning : Wave energy is one of the possible solutions for meeting the future energy demand in a clean and sustainable way. Extracting large amounts of energy, a wave energy device would be subjected to extreme and fatigue loads from the waves. LÄS MER

  7. 5. Numerical Simulation of Wind Turbine Wakes based on Actuator Line Method in NEK5000

    Master-uppsats, KTH/Mekanik

    Författare :Wenjie Jin; [2013]
    Nyckelord :Wind Turbine; Wake Flow; Actuator Line Method; NEK5000; Trip Vortices;

    Sammanfattning : Nowadays wind turbines are clustered in wind farms and the wake development plays an important role in energy production and blade fatigue load of tubines. The actuator line method is an effective modeling approach that gives improtant wake flow characterstics of a wind turbine. LÄS MER