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Schiela, Anton ; Olsson, Hans:
Mixed-mode integration for real-time simulation.
In:
Papers of the Modelica Workshop 2000. -
Linköping, Sweden
: Modelica Association
,
2000
. - S. 69-75
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| Projekttitel: |
Offizieller Projekttitel Projekt-ID IST Project "Real-time simulation for design of multi-physics systems" (RealSim) with "Deutsches Zentrum für Luft- und Raumfahrt e. V." (DLR) and Dynasim AB IST-199-11979 |
|---|---|
| Projektfinanzierung: |
European Commission, 5th Framework Programme (FP5), Information Society Technologies Programme (IST) for Research, Technological Development and Demonstration on a "User-friendly information society" |
Abstract
The new possibilities of multi-domain hierarchical modelling often lead to models with both fast and slow parts. In this paper a new approach to simulate such systems is discussed that is especially useful in real-time applications. Mixed-mode integration represents a middle course between implicit and explicit integration. The main idea is to split up the system into a fast and a slow part and to apply implicit discretization only to the fast part. The partitioning of the system can be performed offline using a newly developed automatic selection routine, before real-time simulation starts. Mixed-mode integration was applied to several Modelica models from different fields, e.g. models of a diesel engine and an industrial robot and tested using Dymola. Speedup factors from about 4-16 were recorded. In this paper, mixed-mode integration is introduced, the selection routine is described and numerical results are presented.