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...
Introduction of new engine modelling features for real time applications and controller design
In the Autumn release of the VeSyMA-Engines library, there are some new features included with regards to the air path (intake and exhaust) , the combustion modelling and the mean value engine model. An engine model is created with combined Mean Value Engine Model (MVEM) for air path (intake...
Decouple blocks and model parallelisation
As simulation models become ever more complex, simulation time increases as a result. Initially, this is not a huge issue (unless the simulation is to be run in real-time, but that is a separate case), until the time it takes to simulate a model is inconveniently long. Added model...
Output Data Organization – Part 2
As stated in Part 1 of the series of blog posts on output data organization, it is helpful to create collections of variables at the experiment level of a simulation which serve as output data repositories. Part 2 of this series on output data organization will outline one way...
Modifications introduced in Modelica 3.4
The Modelica Association released the Modelica Language Specification version 3.4 on 15 May 2017. This blog entry summarises the major changes to the language specification with the aim of helping users to be aware of the changes. These changes have been supported in Dymola since Dymola 2018. Main Changes The...
New Features in Dymola 2019
Dymola 2019 is now out and there are many new features that have been added to this new release. More information on these can be found in the official Dymola 2019 Release Notes. DAE mode for more efficient simulation of large models Improved initial guesses for equations in the...
Dymola Basics: 9. Modelica Language – Variables
This blog post is a continuation from a previous post on the Modelica Language. This blog post goes into a little more detail regarding variable definition and syntax in equations and algorithms. The Class Restriction of a class can restrict the ability to use certain elements and methods, also described...
How to Debug an Engine Model
This blog post describes a procedure to debug a crank-angle resolved engine model (CAREM) in Dymola. It helps narrow down to the cause of the problem in case the engine runs but does not produce the expected results. A CAREM is a multi-domain (mechanics, fluids, thermal, electrical) model so...
Case study: Using Dymola to automate testing and post processing by writing a function
Background – Why does steering feel matter? Creating a realistic feel to the steering of a vehicle model is very important for DiL simulations, due to the role torque feedback through the steering wheel plays in how the driver interprets the dynamic response of the vehicle. A vehicle with...