Models of physical systems with state logic and time based discontinuities can often produce events in Dymola. These events can have a significant impact on your simulation performance, so it is important that we understand where these events are coming from in the model. In this blog post I’m...
Abstract: This blog post is aimed to describe the Find Connection command available in Dymola. This Dymola command is helpful for searching of signals created within large Modelica models especially using Modelica expandable connector. For demonstrating the features of this command, a Hybrid Electric Vehicle example available in a...
There are lots of reasons why a model can fail and sometimes it feels like an endless battle just keeping models running. But what do you do if there is a model that used to run and for some unknown reason it just doesn’t any more? Or a model...
This blog post assists in the creation of a simple seat model in Dymola that will allow to study the head rest’s acceleration, very important criteria for driver comfort, during a Tip-in/Tip-out manoeuvre. The seat head rest’s acceleration is in most cases different from the vehicle chassis acceleration and has...
Have you ever picked up someone else’s Dymola models (or even ones you’ve built in the past) and thought to yourself – WHAT A MESS!? – or WHAT IN THE WORLD WAS I DOING HERE?! Organization is the first step to eliminating this sort of response. When creating models...
This blog post describes the creation of enumeration types, the usage of enumeration and interfacing enumeration with integers. Using enumeration Definition of an enumeration type An enumeration type is a data type that consists of a number of elements (i.e. a list). A variable of this enumeration type can be...
This blog post describes the modelling method for knock detection in a gasoline engine. The knock model is modelled based on an AnB correlation, where A, B and n are parameters that depend on fuel type. It is described by the Arrhenius equation, which is empirically derived and describes...
Functions in Dymola provide a useful way to run multiple models iteratively, in parametric sweeps or in other configurations and studies. A previous blog post, (How to simulate a model multiple times with different parameter values), explores various methods to automate simulation execution, which can be called via a...
Introduction This article is about practical aspects of tuning linear controllers in models and maintaining awareness of the physical implications of the results, without delving into the theory. We’ll look at a well-behaved model, which nonetheless illustrates a few features available in the MSL, such as: A PID block...
A new addition for the Dymola 2018 FD01 release was the Vehicle Demos library from Claytex. The key purpose of this library is to demonstrate the coupling of multiple automotive Modelica libraries together in a vehicle model. By combining libraries focused on modelling different automotive systems, you can create...
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