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Non-standard semantics of hybrid systems modelers

Albert Benveniste 1 Timothy Bourke 2 Benoît Caillaud 1 Marc Pouzet 2 
1 S4 - System synthesis and supervision, scenarios
IRISA - Institut de Recherche en Informatique et Systèmes Aléatoires, Inria Rennes – Bretagne Atlantique
2 Parkas - Parallélisme de Kahn Synchrone
DI-ENS - Département d'informatique - ENS Paris, Inria Paris-Rocquencourt, CNRS - Centre National de la Recherche Scientifique : UMR 8548
Abstract : Hybrid system modelers have become a corner stone of complex embedded system development. Embedded systems include not only control components and software, but also physical devices. In this area, Simulink is a de facto standard design framework, and Modelica a new player. However, such tools raise several issues related to the lack of reproducibility of simulations (sensitivity to simulation parameters and to the choice of a simulation engine). In this paper we propose using techniques from non-standard analysis to define a semantic domain for hybrid systems. Non-standard analysis is an extension of classical analysis in which infinitesimal (the ε and η in the celebrated generic sentence ∀ε∃η... of college maths) can be manipulated as first class citizens. This approach allows us to define both a denotational semantics, a constructive semantics, and a Kahn Process Network semantics for hybrid systems, thus establishing simulation engines on a sound but flexible mathematical foundation. These semantics offer a clear distinction between the concerns of the numerical analyst (solving differential equations) and those of the computer scientist (generating execution schemes). We also discuss a number of practical and fundamental issues in hybrid system modelers that give rise to non-reproducibility of results, non-determinism, and undesirable side effects. Of particular importance are cascaded mode changes (also called "zero-crossings" in the context of hybrid systems modelers).
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Submitted on : Tuesday, December 18, 2012 - 5:27:35 PM
Last modification on : Thursday, March 17, 2022 - 10:08:44 AM

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Albert Benveniste, Timothy Bourke, Benoît Caillaud, Marc Pouzet. Non-standard semantics of hybrid systems modelers. Journal of Computer and System Sciences, 2012, In Commemoration of Amir Pnueli, 78 (3), pp.877-910. ⟨10.1016/j.jcss.2011.08.009⟩. ⟨hal-00766726⟩



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