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Types in the Modelica Language
Linköpings universitet, Institutionen för datavetenskap. (PELAB)
Linköpings universitet, Institutionen för datavetenskap. (PELAB)ORCID-id: 0000-0002-3435-4996
Imagine, France.
2006 (engelsk)Konferansepaper, Publicerat paper (Annet vitenskapelig)
Abstract [en]

 

Modelica is an object-oriented language designed

for modeling and simulation of complex physical

systems. To enable the possibility for an engineer

to discover errors in a model, languages and com-

pilers are making use of the concept of types and

type checking. This paper gives an overview of

the concept of types in the context of the Model-

ica language. Furthermore, a new concrete syntax

for describing Modelica types is given as a starting

point to formalize types in Modelica. Finally, it is

concluded that the current state of the Modelica

language specification is too informal and should

in the long term be augmented by a formal defin-

ition.

 

sted, utgiver, år, opplag, sider
2006. s. 303-315
Emneord [en]
type system; types; Modelica; simulation; modeling; type safety
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-12698OAI: oai:DiVA.org:liu-12698DiVA, id: diva2:16877
Konferanse
Proceedings of the Fifth International Modelica Conference, Vienna 2006
Tilgjengelig fra: 2007-11-16 Laget: 2007-11-16 Sist oppdatert: 2014-10-08
Inngår i avhandling
1. Safety, Security, and Semantic Aspects of Equation-Based Object-Oriented Languages and Environments
Åpne denne publikasjonen i ny fane eller vindu >>Safety, Security, and Semantic Aspects of Equation-Based Object-Oriented Languages and Environments
2007 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
Abstract [en]

During the last two decades, the interest for computer aided modeling and simulation of complex physical systems has witnessed a significant growth. The recent possibility to create acausal models, using components from different domains (e.g., electrical, mechanical, and hydraulic) enables new opportunities. Modelica is one of the most prominent equation-based object-oriented (EOO) languages that support such capabilities, including the ability to simulate both continuous- and discrete-time models, as well as mixed hybrid models. However, there are still many remaining challenges when it comes to language safety and simulation security. The problem area concerns detecting modeling errors at an early stage, so that faults can be isolated and resolved. Furthermore, to give guarantees for the absence of faults in models, the need for precise language specifications is vital, both regarding type systems and dynamic semantics.

This thesis includes five papers related to these topics. The first paper describes the informal concept of types in the Modelica language, and proposes a new concrete syntax for more precise type definitions. The second paper provides a new approach for detecting over- and under-constrained systems of equations in EOO languages, based on a concept called structural constraint delta. That approach makes use of type checking and a type inference algorithm. The third paper outlines a strategy for using abstract syntax as a middle-way between a formal and informal language specification. The fourth paper suggests and evaluates an approach for secure distributed co-simulation over wide area networks. The final paper outlines a new formal operational semantics for describing physical connections, which is based on the untyped lambda calculus. A kernel language is defined, in which real physical models are constructed and simulated.

sted, utgiver, år, opplag, sider
Institutionen för datavetenskap, 2007. s. 26
Serie
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1337
Emneord
Modeling, Simulation, Equation-Based, Object-Oriented, Modelica, Type System, Semantics, Language Safety, Secure Simulation
HSV kategori
Identifikatorer
urn:nbn:se:liu:diva-10134 (URN)978-91-85895-24-3 (ISBN)
Presentation
2007-12-07, Visionen, B, Linköpings universistet, Linköping, 13:15 (engelsk)
Opponent
Veileder
Merknad
Report code: LIU-TEK-LIC-2007:46. On the day of the defence date the status of article IV was: In Progress; The status of article V was: Manuscript.Tilgjengelig fra: 2007-11-16 Laget: 2007-11-16 Sist oppdatert: 2018-01-13

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Broman, DavidFritzson, Peter

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Totalt: 148 treff
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