B. Zupancic
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Realisation-preserving modelling is a modelling when a computer aided approach is used with the basic aim to keep the physical structure of a real system or its topology as much as possible in the model and can be effi ciently supported by new object-oriented and multi-domain tools based on the Modelica language. The important advantages of such tools in comparison with traditional block oriented modelling
approaches are described. The paper also describes an education (laboratory helicopter) and an industrial application project (thermal and radiation fl ows in buildings) in the Modelica environment and some experience obtained from these projects and from a more general usage of the Modelica environment. However, models in Modelica become very complex, which also causes numerical problems that are diffi cult to diagnose. So, simplifi cation and/or reduction wherever possible are
important. Therefore, we propose some model reduction solutions for both modelling levels- for the equation and diagram layer.
Keywords: realisation-preserving modelling, object oriented modelling, acausal
modelling, physical modelling, multi-domain modelling, model reduction.
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