Abstract
A new language called Modelica for physical modeling is developed in an international effort. The main purpose is to make it easy to exchange models and model libraries. The design approach builds on non-causal modeling with true equations and the use of object-oriented constructs to facilitate reuse of modeling knowledge. There are already several modeling languages based on these ideas available from universities and small companies. There is also significant experience of using them in various applications. The aim of the Modelica effort is to unify the concepts and design a new uniform model language for model representation. The paper describes the effort and gives an overview of Modelica.
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