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Initialization of Hybrid Differential-Algebraic Equations in Modelica 2

Mattsson, Sven Erik and Elmqvist, Hilding and Otter, Martin and Olsson, Hans (2002) Initialization of Hybrid Differential-Algebraic Equations in Modelica 2. In: Proc. of 2nd International Modelica Conference, Oberpfaffenhofen, March 18-19, pp. 10-15. Modelica 2002, 2002-03-18 - 2002-03-19, Oberpfaffenhofen.

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Abstract

Modelica 2 provides new powerful language constructs for specifying initial conditions. Before any operation is carried out with a Modelica model, such as simulation or linearization, initialization takes place to assign consistent values for all variables, derivatives and pre-varialbles present in the model. To obtain consistent values, the initialization uses all equations and algorithms that are utilised during the simulation. Additional constraints necessary to determine the initial values of all variables can be provided as start values for any variables as well as additional constraint equations in initial equation sections. A novel feature is the possibility to have a sampled controller initialized in steady state. This tutorial paper describes and explains the new language constructs and illustrates how they in combination with Modelica's other language elements allow very flexible and powerful initialization conditions to be defined.

Document Type:Conference or Workshop Item (Paper)
Additional Information:LIDO-Berichtsjahr=2002,
Title:Initialization of Hybrid Differential-Algebraic Equations in Modelica 2
Authors:
AuthorsInstitution or Email of Authors
Mattsson, Sven ErikDynasim AB, Lund
Elmqvist, HildingDynasim AB, Lund
Otter, MartinUNSPECIFIED
Olsson, HansDynasim AB, Lund
Date:March 2002
Journal or Publication Title:Proc. of 2nd International Modelica Conference, Oberpfaffenhofen, March 18-19
Page Range:pp. 10-15
Status:Published
Keywords:Modelica, Dymola, Initialization, Hybrid Systems, Differential-Algebraic Equations
Event Title:Modelica 2002
Event Location:Oberpfaffenhofen
Event Type:international Conference
Event Dates:2002-03-18 - 2002-03-19
Organizer:The Modelica Association and DLR Oberpfaffenhofen
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Robotics and Mechatronics
Deposited By: elib DLR-Beauftragter
Deposited On:13 Mar 2006
Last Modified:12 Dec 2013 20:02

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