Modeling Hybrid Systems in SIMTHESys

Studies in Hybrid Systems : Modeling ,

Complex systems typically possess a hierarchical structure, characterized by continuousvariable dynamics at the lowest level and logical decision-making at the highest. Virtually all control systems today perform computer-coded checks and issue logical as well as continuous-variable control commands. Such are “hybrid” systems. Traditionally, the hybrid nature of these systems is suppressed by c...

Modeling Stochastic Hybrid Systems

Stochastic hybrid systems arise in numerous applications of systems with multiple models; e.g., air traffc management, flexible manufacturing systems, fault tolerant control systems etc. In a typical hybrid system, the state space is hybrid in the sense that some components take values in a Euclidean space, while some other components are discrete. In this paper we propose two stochastic hybrid...

Modeling of Hybrid Systems

Qualitative Modeling of Hybrid Systems

The paper discusses an approach to construct discrete abstractions of hybrid systems by means of qualitative reasoning. The work is performed in the context of a modeling language for hybrid systems CHARON. We introduce a qualitative version of the language and describe the abstraction technique using a motivational example. The resulting abstract model is conservative and can be used to analyz...

Hybrid Systems Modeling and Control

Hybrid systems can switch between many operating modes where each mode is governed by its own characteristic dynamical laws. Mode transitions are triggered by variables crossing specific thresholds (state events), by the lapse of certain time periods (time events), or by external inputs (input events). A simple example of a hybrid system would be a car. The dynamics of the car switch when a gea...