Mode Initialization when Simulating Switched Bond Graphs, version II
نویسنده
چکیده
When simulating hybrid systems using switched bond graphs, the initialization of new modes is made by using a generalization of the principle of momentum conservation. Here it is shown how to use causality propagation to get an efficient initialization algorithm. By looking at causal paths, set of variables that have to be initialized simultaneously are found. Furthermore, it is shown how impulses due to structural changes in the system can be found with a correct initialization and with a correct treatment of modes with causal conflicts between sources.
منابع مشابه
HyBrSim – A Modeling and Simulation Environment for Hybrid Bond Graphs
Bond graphs are a powerful formalism to model continuous dynamics of physical systems. Hybrid bond graphs introduce an ideal switching element, the controlled junction, to approximate continuous behavior that is too complex for numerical analysis (e.g., because of nonlinearities or steep gradients). HyBrSim is a tool for hybrid bond graph modeling and simulation implemented in Java and document...
متن کاملOn the Stability of a Class of Switched Bond Graphs
This paper deals with the stability analysis of a class of switched bond graphs where all the storage components remain unchanged and in integral causality under mode switching. These properties assure the existence of a unique energy function common to all the switching modes, and the non occurrence of state jumps or discontinuities in the switched system trajectories. A result on stability of...
متن کاملSwitched Bond Graphs as Front - End to
Formal veriication of safety and timing properties of engineering systems is only meaningful if based on models which are systematically derived. In this paper we report on our experience using switched bond graphs for the modelling of hardware components in hybrid systems. We present the basic ideas underlying bond graphs in general and switched bond graphs in particular. Switched bond graphs ...
متن کاملNumerical Solution of Hybrid Systems of Differential-algebraic Equations
We present a mathematical framework for general overand underdetermined hybrid (switched) systems of differential-algebraic equations (HDAEs). We give a systematic formulation of HDAEs and discuss existence and uniqueness of solutions, the treatment of the switch points and how to perform consistent initialization at switch points. We show how numerical solution methods for DAEs can be adapted ...
متن کاملAn Efficient Method for Simulating Complex Systems with Switching Behaviors Using Hybrid Bond Graphs
Accurate and efficient modeling and simulation approaches are essential for design, analysis, diagnosis, and prognosis of complex embedded systems. This paper presents an efficient simulation scheme for systems with mixed continuous and discrete behaviors. We model hybrid systems using hybrid bond graphs (HBGs), a multi-domain physics-based modeling language that incorporates local switching fu...
متن کامل