Build FMUs from Dymola model and run the FMUs in Dymola and Simulink
This blog post describes the procedures required to build FMUs from Dymola models and run the FMUs in both Dymola and Simulink. In this way Dymola models can be tested and run together with other models or controllers in Simulink. An engine model has been used to demonstrate the...
How to easily run a parameter sweep in Dymola
In Dymola 2019 FD01, it has been made easier than ever to carry out a parameter sweep study. There is indeed an integrated capability in the software and its interface has been improved in this latest release. Let’s have a look at an example. Let’s run the example DoublePendulum...
Customising Dymola Menus & Startup — Modelica Library Opener
Introduction This blog post presents a methodology for opening (loading) a customised set of Modelica libraries in Dymola with a single click. For demonstrating this method, VeSyMA® (Vehicle Systems Modelling and Analysis), a suite of commercial Modelica libraries is used. For making this feature appear by default in the Dymola...
Modifying Setup.dymx for Automatic Flags
At Claytex we always like finding ways of making working with any tool including Dymola more productive. There are many advanced flags within Dymola that are used daily, why not automatically have them set every time you load Dymola? There are many flags within Dymola that can be used...
VeSyMA CloudSim for Web-app
VeSyMA CloudSim for web-app is a single page application which dynamically updates result data in the html page while the user interacts with web-app. It is a Claytex in-house built tool and uses Amazon AWS Serverless resources; e.g. Cognito, Lambda functions, API Gateway, S3 bucked, DynamoDB. Figure 1 – a: Login...
Modelica External Object Example: Detecting the Initial Rising Edge
This blog post describes the use of an external object class as described by the Modelica modelling language. In Modelica, a predefined partial class called an ExternalObject may be used for accessing external memory and performing various tasks using external functions written in C (specifically C89) and FORTRAN 77....
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...