Archive for category: Concepts and methods

Hierarchical Connectors in Dymola

Hierarchical Connectors in Dymola

Written by: Romain Gillot – Project Engineer A convenient way to pass a number of variables/signals between components or subsystems in Dymola is to use hierarchical connectors. Modelica supports hierarchical connectors (Connectors which contain sub connectors). As a result, it is possible to connect several sub connectors together with...

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Stability Analysis in Dymola – Part 2

Stability Analysis in Dymola - Part 2

Written by: Sas Harrison – Systems Engineer Anatomy of Linear Feedback – Closed Loops & Root Loci Introduction This article will explain the nature of linear feedback. Models laid out intuitively in the DYMOLA GUI are connected systematically with the ideas of Laplace-domain block diagrams commonly used in controller development, while...

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Exporting Models & Licensing

Exporting Models & Licensing

Written by: Garron Fish – Chief Engineer Introduction This article looks at the different model export methods, their limitations and the respective Dymola licensing requirements. Ways to Export a Model  Models can be exported in several different forms: Executable Whenever a model is translated, an executable file is created, called...

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Stability Analysis in Dymola – Part 1

Stability Analysis in Dymola - Part 1

Written by: Sas Harrison – Systems Engineer Introduction This article introduces several ideas that provide foundations for stability analysis in DYMOLA. Those ideas have several applications, including the creation of root locus diagrams, which provide information about transient behaviour (and therefore stability) and assessment of frequency-response that details how...

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Reading structures from .mat files

Reading structures from .mat files

Written by: Garron Fish – Chief Engineer This blog post shows how to assign Dymola model parameters to elements of a structure stored in a .mat file. In Modelica 3.2.2 a new function is introduced called Modelica.Utilities.Stream.readRealMatrix() which allows users to read a Matlab .mat file saved in the v4,...

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