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Momentum balance implementation in Dymola

March 27, 2017

Written by: Maura Gallarotti – Project Engineer When starting to work on fluids in Dymola, it is of paramount importance to build base classes where the momentum, energy and mass balances are performed, in order to have a common base class for several models and a strong foundation to build your own library. A good starting read more

Jumping Cars with the Chassis Dynamics Library

March 17, 2017

Written by: David Briant – Project Engineer There are many commonly used experiments included in the new Chassis Dynamics library ranging from the simple mass check experiment to slalom and double lane change manoeuvres. These common tests are very useful in setting up and testing vehicle performance for every day driving situations and common road vehicle read more

Linearised Mean Value Engine Model-based Idle Control

March 10, 2017

Written by: Xiaoran Han – Project Engineer 1. Introduction PID controllers have been widely used for control design due to their simplicities and non-model based design. However, they lack robustness with respect to uncertainties and external disturbances. This blog post describes a method for developing a mean value model of intake manifold pressure and engine speed read more

EDrives Library Including Electric Machines

March 3, 2017

For more information on the EDrive Library including Electric Machines, please view: EDrives Key Performance Indicators Please get in touch if you have any questions or have got a topic in mind that you would like us to write about. You can submit your questions / topics via: Tech Blog Questions / Topic Suggestion.

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

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