Discretizing Time or States? A Comparative Study between DASSL and QSS

FLOROS, XENOFON; CELLIER, FRANÇOIS; KOFMAN, ERNESTO

Oslo

Workshop; International Workshop on Equation-based Object-oriented Modeling Languages and Tools; 2010

Linkoping University

In this study, a system is presented and analyzed that au-tomatically translates a model described within the Mod-elica framework into the Discrete Event System Specifica-tion (DEVS) formalism.More specifically, this work interfaces the open-sourceimplementation of Modelica, OpenModelica, and oneparticular software tool for DEVS modeling and simula-tion, the PowerDEVS environment, which implements theQuantized State Systems (QSS) integration methods intro-duced by Kofman.The interface enables the automatic simulation of large-scale models with both DASSL (using the OpenModelicarun-time environment) and QSS (using PowerDEVS) andextracts features, such as accuracy and simulation time, thatallow a quantitative comparison of these integration meth-ods. In this way, meaningful insight can be obtained ontheir respective advantages and disadvantages when usedfor simulating real-world applications. Furthermore, theimplemented interface allows any user without any knowl-edge of DEVS and/or QSS methods to simulate their sys-tems in PowerDEVS by supplying a Modelica model asinput only.