Constraining common parameters in a replaceable model
Making flexible models: utilising the replaceable model declaration One of the easiest ways of handling the propagation of a plethora of parameters from model variants designed to be replaceable (sharing a base class) is the replaceable model declaration. As my colleague demonstrates in a previous blog post, such a...
Using string parameters in FMU models
This blog post looks at exporting models as FMUs containing string parameters and modifying those string parameters in the FMU before simulating. Process for creating FMUs with string parameters and modifying these strings The basic instructions for creating an FMU containing modifiable string parameters are below: Make sure the...
Using Units in Your Dymola Models
When building a model, it’s important to remember that the majority of parameters and variables we add are not just real numbers but represent physical quantities. So, to add physical meaning to the parameters and variables in our models we should make use of unit types. Doing this will enable...
Import your way to more lean Modelica code
When building up a library in Modelica it is often handy to use aliases to clean up your code. Aliases to frequently used classes can help simplify the code and help its readability. The Modelica import statement is how one creates aliases in Modelica. One implementation that we often...
VeSyMA Dashboard Animation Video: A Plug-in Hybrid Fuel Cell Electric Car
Dymola has very powerful plot and animation features. They can be activated or deactivated during and/or after the simulation of the Modelica model. The animation of the Dymola model can be run at different speeds, halted, single stepped, in parallel with previous/saved animation results and run backwards. For more...
Using VeSyMA to deploy Dymola and rFPro together during vehicle development
Modern vehicles; modern challenges Vehicles are getting ever more complex, with subsystems becoming further interdependent with the wider system dynamics than ever before. Beyond this, modern vehicles now interact with their surroundings, reacting and responding to changes in the immediate environment. This is never truer than in autonomous vehicles....
Dymola Basics: 9. Modelica Language – Calculations
This blog post is a continuation from a previous post on the Modelica Language. This blog post focuses on the syntax used in equations and algorithms and the difference between the two. Calculations Equation Sections Models and blocks primarily use an equation section to define the calculations of the...
Data Quality Effect on Multi-domain Simulation Results
There is an old expression that says, “Bad data in, bad data out”, or words to that effect. A key skill an accomplished CAE engineer must have is to be able to verify the quality of input data but also judge the quality and physical validity of simulation results....
Rationalisation of Bus and Sub-bus signals in the Engines library
As part of the 2018.3 release of the VeSyMA – Engines library, some new features and improvements have been implemented. One of the main ones is the rationalisation of the sub busses and of the bus signals. Until now, several busses were used throughout the library to pass signals...
Using External Data Sources in Your Dymola Model via ExternData
When you have large data sets to parameterise your Dymola models, it can be tedious to enter all the data manually, especially if you have numerous data sets you want to switch between. If you have data stored in external data files you can use the ExternData Library to...