Sökning: "frequency response functions"

Visar resultat 11 - 15 av 43 uppsatser innehållade orden frequency response functions.

  1. 11. Monitoring Vehicle Suspension Elements Using Machine Learning Techniques

    Master-uppsats, KTH/Spårfordon

    Författare :Henrik Karlsson; [2019]
    Nyckelord :Condition monitoring; condition based maintenance; FDI; diagnostics; machine learning; classification algorithms; dimensionality reduction; feature selection; feature transformation; frequency response functions.; Tillståndsövervakning; tillståndsbaserat underhåll; FDI; diagnostik; maskininlärning; klassificeringsalgoritmer; dimensionalitetsreducering; särdragsextrahering; särdragstransformering; frekvenssvarsfunktioner.;

    Sammanfattning : Condition monitoring (CM) is widely used in industry, and there is a growing interest in applying CM on rail vehicle systems. Condition based maintenance has the possibility to increase system safety and availability while at the sametime reduce the total maintenance costs. LÄS MER

  3. 12. Parametric Studies of Soil-Steel Composite Bridges for Dynamic Loads, a Frequency Domain Approach using 3D Finite Element Modelling

    Master-uppsats, KTH/Bro- och stålbyggnad

    Författare :Jonathan Ljung; [2019]
    Nyckelord :dynamics; soil-steel composite bridges; corrugated steel plates; frequency response functions; frequency domain; perfectly matched layers; Comsol Multiphysics; parametric studies i;

    Sammanfattning : In this thesis, parametric studies have been performed for a soil-steel compositebridge to determine and investigate the most influential parameters on the dynamicresponse.High-speed railways are currently being planned in Sweden by the Swedish TransportAdministration with train speeds up to 320 km/h. LÄS MER

  4. 13. Optimizing the functionalities of a code for real time dynamics of finite systems

    Kandidat-uppsats, Lunds universitet/Matematisk fysik; Lunds universitet/Fysiska institutionen

    Författare :Yasser Mahfoud; [2018]
    Nyckelord :Physics and Astronomy;

    Sammanfattning : The many-body problem in quantum mechanics always presents new challenges and ways to discover new properties of existing materials. The difficulty (if not the impossibility) to solve the many-body problem analytically makes the numerical methods an appealing approach. LÄS MER

  5. 14. Finite Element Analysis of the Dynamic Effect of Soil-Structure Interaction of Portal Frame Bridges - A Parametric Study

    Master-uppsats, KTH/Bro- och stålbyggnad

    Författare :Turgay Dagdelen; Shaho Ruhani; [2018]
    Nyckelord :Soil-Structure Interaction; Railway Bridge; Portal Frame Bridge; Dynamic Analysis; Parametric Study; Nonlinear Analysis; Jord-struktur interaktion; Järnvägsbro; Plattrambro; Dynamisk analys; Parametrisk studie; Icke-linjär analys;

    Sammanfattning : In Sweden, the railway sector currently faces the challenge of developing its first high-speed railway line, in response to the need to provide faster domestic and international transport alternatives. High-speed train passages on railway bridges can cause resonance in the bridge superstructure, which induce high accelerations that should not exceed the limits stipulated in the current design code. LÄS MER

  7. 15. Train Induced Vibration Analysis of an End-frame Bridge : Numerical Analysis on Sidensjövägen

    Master-uppsats, KTH/Bro- och stålbyggnad

    Författare :Niklas Wiberg; Jasmin Halilovic; [2018]
    Nyckelord :Accelerations; Dynamics; End-frame bridge; FE-modeling; Frequency response function; High-speed railway; Soil structure interaction; Train induced vibrations; 2D 3D;

    Sammanfattning : Higher speeds and higher capacity will cause the Swedish rail network to be exposed to disturbing dynamic effects. Higher speeds cause higher vertical acceleration levels of the bridge deck. In this thesis, a numerical analysis of a three span end-frame bridge subjected to train induced vibrations is performed. LÄS MER