Modelica^® – A Unified Object-Oriented Language for Systems Modeling

Language Specification

Version 3.5

February 18, 2021

Modelica Association

Abstract

This document defines the Modelica language, version 3.5, which is developed by the Modelica Association, a non-profit organization with seat in Linköping, Sweden. Modelica is a freely available, object-oriented language for modeling of large, complex, and heterogeneous systems. It is suited for multi-domain modeling, for example, mechatronic models in robotics, automotive and aerospace applications involving mechanical, electrical, hydraulic control and state machine subsystems, process oriented applications and generation and distribution of electric power. Models in Modelica are mathematically described by differential, algebraic and discrete equations. No particular variable needs to be solved for manually. A Modelica tool will have enough information to decide that automatically. Modelica is designed such that available, specialized algorithms can be utilized to enable efficient handling of large models having more than one hundred thousand equations. Modelica is suited and used for hardware-in-the-loop simulations and for embedded control systems. More information is available at https://www.modelica.org.

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The contributors to this and to previous versions of this document are listed in appendix D. All contributors worked voluntarily and without compensation.