Improving CONTACT for varying timesteps

Title

Improving CONTACT for varying timesteps

 Author

van der Wekken, Niels (TU Delft Electrical Engineering, Mathematics and Computer Science)

Contributor

Vuik, Cornelis (mentor) ORCID 0000-0002-5988-9153
Vollebregt, E.A.H. (graduation committee)

Degree granting institution

Delft University of Technology

 Date

2017-08-31

 Abstract

The CONTACT software created by Kalker and further developed by Vollebregt has recently been integrated in dynamical simulation software like RecurDyn and libraries usable in Matlab or C. When such larger packages impose small timesteps compared to the gridsize used, a wiggle-like phenomenon arises. Additionally, transient time-stepping appears to give rise to a smoothing effect that alters detailed traction profiles. A method is presented that focuses on scaling of the timestep for the influence coefficient matrices. This method stops the occurrence of wiggles. Furthermore, the smoothing effect is explained and a solution for this problem is proposed using world-fixed coordinates. These two refinements result in an improved algorithm that allows for small timesteps to be chosen in CONTACT, producing results consistent with results using larger timestep sizes.

 Subject

rolling contact
wheel-rail
transient
multi-body dynamics
traction
instabilities

 To reference this document use:

http://resolver.tudelft.nl/uuid:9a709a5d-9b2e-4b72-b16b-53feb5200a62

 Part of collection

Student theses

 Document type

master thesis

 Rights

© 2017 Niels van der Wekken
Files
PDF thesisNiels.pdf 1.28 MB
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