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Hierarchical Connectors in Dymola

February 24, 2017

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 a reduced number of connection lines. read more

Dymola/Modelica: Tips & Tricks – Part 1: ‘Li-ion Battery Partial Modelling and Parameterisation’

February 17, 2017

Written by: Raees B. K. Parambu – project Engineer Download a copy of this article as a pdf: Dymola  Modelica: Tips & Tricks – Part 1: ‘Li-ion Battery Partial Modelling and Parameterisation’ Abstract This article is aimed to present a methodology to develop a partial acasual equivalent-circuit based model (ECM) of Lithium-ion (Li-ion) battery in Dymola, read more

Stability Analysis in Dymola – Part 2

February 10, 2017

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 the concepts of proportional, integral & read more

Comparing the optimisation of gear ratios for different drive cycles

February 6, 2017

Written by: David Briant – Project Engineer When considering fuel consumption tests, comparatively little information is required to generate a reasonable understanding of the effects of changes to a vehicle’s design. In Europe, the fuel consumption of a vehicle is evaluated using the New European Drive Cycle (NEDC), with the United States the equivalent termed the read more

Understanding State Selection in Multibody Simulation

January 27, 2017

Written by: Theodor Ensbury – Project Engineer Unique to Modelica based tools, such as Dymola, state selection is a topic which affects every model produced which can manifest itself in several possible ways; a brief introduction and overview to the topic of state selection can be found here. Ever seen a multibody simulation initialise in an apparently read more

Exporting Models & Licensing

January 20, 2017

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 dymosim.exe. When the model is simulated read more


January 13, 2017

The SED library delivers pre-defined Modelica models that contain definitions of full electric drive systems – ready to be connected to a voltage supply and a mechanical load. These models enable the rapid simulation and analysis of complex electro-mechanical drive systems (e.g. dynamic simulation of a hybrid electric vehicle’s powertrain systems and components). Components at read more

Stability Analysis in Dymola – Part 1

January 9, 2017

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 well an input is translated to read more

Reading structures from .mat files

January 3, 2017

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, v6 or v7 formats (see Figure read more

Stepping through dymosim.exe

November 30, 2016

Written by: Garron Fish – Chief Engineer When a Modelica model is translated in Dymola, the process involves a Modelica code of the Dymola model that translates into a C code, and then this C code compiles and links into an executable called dymosim.exe. Typically, if the model fails, then an error message is created read more

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