Methods and Tools for Co-Simulation of Dynamic Systems with the Functional Mock-up Interface
Author
Summary, in English
In this thesis, stability questions of weakly coupled linear systems with feed-through are studied. Methods, within scope of the FMI, are further proposed which offer improved stability properties, compared to the classical case.
A simulation of a weakly coupled system introduces discontinuities due to input changes for the internal solvers. If the internal solver is a multistep method, these discontinuities will result in that the performance of the method is poor. In this thesis, a modification of the predictor in a multistep method is proposed achieving increased performance.
Furthermore, two software packages are presented. The package PyFMI is a high-level package for working with models following the FMI and contains methods for simulation of weakly coupled systems. The package Assimulo connects different solvers under a common interface which, together with PyFMI, provides an environment for evaluating solvers on industrial models. The packages are demonstrated by various examples ranging from simple test cases to a more extensive industrial application. Additionally, they have been used to verify the proposed methods and the proposed modification to the predictor, as well as being successfully used in a number of different applications outside the authors work.
Department/s
Publishing year
2016
Language
English
Publication/Series
Doctoral Theses in Mathematical Sciences
Full text
Document type
Dissertation
Topic
- Computational Mathematics
Keywords
- Coupled Systems
- Co-Simulation
- FMI
- Functional Mock-up Interface
- PyFMI
- Assimulo
- Stability
- Master Algorithm
Status
Published
Project
- LCCC
Research group
- LCCC
Supervisor
- Claus Führer
- Johan Åkesson
ISBN/ISSN/Other
- ISSN: 1404-0034
- ISBN: 978-91-7623-698-7
Defence date
4 May 2016
Defence time
10:15
Defence place
Lecture hall MH:A, Centre for Mathematical Sciences, Sölvegatan 18, Lund University, Faculty of Engineering
Opponent
- Carol Woodward (Dr.)