Concepts and methods

How to build an embedded graphical interface in Dymola

Written by: Maura Gallarotti – Project Engineer Dymola allows to create embedded graphical user interfaces thanks to the icon annotations. This blog post describes how to visualise in the diagram layer the transient processes with plots, tables and dynamic colouring. Figure 1: Cooling circuit transient animation. Figure 1 shows the GIF of a cooling circuit of an read more

Posted on Monday, June 19th, 2017

Handling of Modelica Model’s Parameter Values in Dymola

Written by: Raees B. K. Parambu – project Engineer Abstract This article is designed to guide the user in handling or organising the parameter values of the top-level experimental models in their models. This blog post may be useful for those newcomers who wish to get an insight into different ways of storing and propagating parameter read more

Posted on Thursday, June 8th, 2017

Idle speed control using Model-based sliding mode control

Written by: Xiaoran Han – Project Engineer Introduction Following the previous blog post, ‘Linearised Mean Value Engine Model-based Idle Control‘, which describes how to derive a linearised model of crank angle resolved engine for idle speed controller design, this article describes the design of a sliding mode controller based on the linearised model and shows simulation read more

Posted on Friday, May 12th, 2017

Stability Analysis in Dymola – Part 3

Written by: Sas Harrison – Systems Engineer Introduction This article will explain the nature of a root-locus diagram and explain how to create one using the DYMOLA software. For students & researchers, we hope the article will open up possibilities to use DYMOLA as the modular, acausal & smart, explicit-analysis software of choice, for control(ler) design & read more

Posted on Friday, May 5th, 2017

Momentum balance implementation in Dymola

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

Posted on Monday, March 27th, 2017

Linearised Mean Value Engine Model-based Idle Control

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

Posted on Friday, March 10th, 2017

Hierarchical Connectors in Dymola

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

Posted on Friday, February 24th, 2017

Dymola/Modelica: Tips & Tricks – Part 1: ‘Li-ion Battery Partial Modelling and Parameterisation’

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

Posted on Friday, February 17th, 2017

Stability Analysis in Dymola – Part 2

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

Posted on Friday, February 10th, 2017

Comparing the optimisation of gear ratios for different drive cycles

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

Posted on Monday, February 6th, 2017

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