Sökning: "stiffness"

Visar resultat 1 - 5 av 768 avhandlingar innehållade ordet stiffness.

  1. 1. Railway Track Stiffness : Dynamic Measurements and Evaluation for Efficient Maintenance

    Författare :Eric Berggren; Mats Berg; Laurent Schmitt; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Railway track stiffness; maintenance; soil dynamics; measurement; simulation; vibration; Vehicle engineering; Farkostteknik;

    Sammanfattning : Railway track stiffness (vertical track load divided by track deflection) is a basic parameter oftrack design which influences the bearing capacity, the dynamic behaviour of passing vehiclesand, in particular, track geometry quality and the life of track components. Track stiffness is abroad topic and in this thesis some aspects are treated comprehensively. LÄS MER

  2. 2. Dynamic track stiffness measurement : a new tool for condition monitoring of track substructure

    Författare :Eric Berggren; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Technology; track stiffness; track maintenance; soil dynamics; measurement; Vehicle engineering; Farkostteknik;

    Sammanfattning : .... LÄS MER

  3. 3. Strukturmekanik & arkitektur Om strukturmekanisk förståelse i gestaltningsprocessen

    Författare :Karl-Gunnar Olsson; Chalmers University of Technology; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; CALFEM; stiffness; structural mechanics; design; architecture; Architectural design process; pointSketch; ForcePAD; canonical stiffness; static eigenvalues;

    Sammanfattning : Organizing material to produce space and a load-carrying structure are central tasks in the architectural design process. In trying out and examining design ideas, use of language and tools appropriate to the purpose is fundamental. LÄS MER

  4. 4. Modelling Stiffness and Damping by Use of Fractional Calculus with Application to Railpads

    Författare :Åsa Fenander; Chalmers University of Technology; []
    Nyckelord :stiffness; initial conditions; modal synthesis; time integration; measurements; fractional calculus; railway tracks; fractional integrals; damping; railpads; structural dynamics; fractional derivatives; mathematical models;

    Sammanfattning : When studying the dynamic behaviour of a structure, e g a railway track, it is important for the analyst to model both stiffness and damping accurately. Mathematical models including fractional derivatives have been found to work well for many materials. Such models are linear and causal. LÄS MER

  5. 5. Resonance sensor technology for detection of prostate cancer

    Författare :Ville Jalkanen; Olof Lindahl; Britt Andersson; Umeå universitet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; resonance sensor; prostate tissue; stiffness; detecting prostate cancer; Medical engineering; Medicinsk teknik;

    Sammanfattning : Prostate cancer is the most common type of cancer in men in Europe and the USA. Some prostate tumours are regarded as stiffer than the surrounding normal tissue, and therefore it is of interest to be able to reliably measure prostate tissue stiffness. The methods presently used to detect prostate cancer are inexact, and new techniques are needed. LÄS MER