Sökning: "multibody simulations"

Visar resultat 1 - 5 av 25 avhandlingar innehållade orden multibody simulations.

  1. 1. Simulation and Measurement of Wheel on Rail Fatigue and Wear

    Författare :Babette Dirks; Mats Berg; Roger Enblom; Mark Burstow; KTH; []
    Nyckelord :multibody simulations; prediction; wear; RCF; wheel; rail; cracks; measurements; Vehicle and Maritime Engineering; Farkostteknik;

    Sammanfattning : The life of railway wheels and rails has been decreasing in recent years. This is mainly caused by more traffic and running at higher vehicle speed. LÄS MER

  3. 2. Ghosts and machines : regularized variational methods for interactive simulations of multibodies with dry frictional contacts

    Författare :Claude Lacoursière; Bo Kåggström; Ander Klarbring; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Discrete mechanics; Variational method; Contact problems; Impacts; Least action principle; Saddle point problems; Lagrange Multipliers; Constrained systems; Multibody Systems; Numerical regularization; Constraint realization; Constraint stabilization; Dry friction; Differential Algebraic Equations; Nonsmooth problems; Linear Complementarity; Quaternion algebra; Numerical linear algebra; Physics modeling; Interactive simulation; Numerical stability; Rigid body dynamics; Dissipative systems; Computational physics; Beräkningsfysik;

    Sammanfattning : A time-discrete formulation of the variational principle of mechanics is used to provide a consistent theoretical framework for the construction and analysis of low order integration methods. These are applied to mechanical systems subject to mixed constraints and dry frictional contacts and impacts---machines. LÄS MER

  4. 3. Contributions to Modelling and Visualisation of Multibody Systems Simulations with Detailed Contact Analysis

    Författare :Alexander Siemers; Dag Fritzson; Peter Fritzson; Mats G. Larson; Linköpings universitet; []
    Nyckelord :TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : The steadily increasing performance of modern computer systems is having a large influence on simulation technologies. It enables increasingly detailed simulations of larger and more comprehensive simulation models. Increasingly large amounts of numerical data are produced by these simulations. LÄS MER

  5. 4. Mechanical track deterioration due to lateral geometry irregularities

    Författare :Kalle Karttunen; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; rolling contact fatigue; track maintenance; track irregularities; wear; multibody dynamics simulations; Railway track geometry;

    Sammanfattning : This thesis deals with how a degraded track geometry influences further degradation of the geometry and the formation of rolling contact fatigue (RCF) and wear of rails. The overall objective is optimisation of railway maintenance. For this, further understanding and quantification of the deterioration of track components are needed. LÄS MER

  7. 5. Adaptive Geometric Numerical Integration of Mechanical Systems

    Författare :Klas Modin; Matematik LTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; multibody dynamics; Geometric numerical integration; rolling bearing simulation; adaptive time-stepping; variable time-step;

    Sammanfattning : This thesis is about structure preserving numerical integration of initial value problems, i.e., so called geometric numerical integrators. LÄS MER