Hierarchical non-linear bond graphs: a unified methodology for modeling complex physical systems
Article Abstract:
Bond graphs have been around for a quarter of a century. While originally intended for modeling mechanical systems, they have meanwhile found widespread applications in many areas of physical system modeling. Bond graphs are a very appealing tool for modeling physical systems, because they represent the flow of power through a system. Since energy and mass are the only tradable goods in our physical universe, a bond graph model is more likely to reflect physical reality than a model derived by use of any other modeling methodology. However, bond graphs, like all graphical techniques, become unwieldy when applied to complex systems. Also, bond graphs were traditionally used to model predominantly linear systems. This paper introduces new concepts for modeling complex physical systems through hierarchical bond graphs which can include arbitrary non-linearities. It introduces a software tool that can be used to implement these hierarchical non-linear bond graphs. Finally, a new application area for bond graphs will be discussed. It will be demonstrated how these hierarchical non-linear bond graphs can be used to model chemical reaction kinetics and chemical thermodynamics together in very general terms also farther away from equilibrium than traditional approaches would permit. (Reprinted by permission of the publisher.)
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1992
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Building intelligence into an autopilot using qualitative simulation to support global decision making
Article Abstract:
In this paper, qualitative simulation is applied to reason inductively about the behavior of a quantitatively simulated aircraft model, to determine n-line when a malfunction occurs in the quantitative model, to hypothesize about the nature of this malfunction, and to decide upon a global strategy that allows to operate (control) the quantitative aircraft model under the modified flying conditions. Such an algorithm could be utilized as an addition to a conventional autopilot to remain operational after a malfunction has taken place. (Reprinted by permission of the publisher.)
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1989
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Matrix environments for continuous system modeling and simulation
Article Abstract:
In any future standard for continuous system simulation languages, it is of primary importance that the data and program structures are made sufficiently general and flexible. In this paper, the use of matrix structures in modeling and simulation, and the impact of matrix environments on the design of simulation languages and their experimental frames will be discussed. (Reprinted by permission of the publisher.)
Publication Name: SIMULATION
Subject: Engineering and manufacturing industries
ISSN: 0037-5497
Year: 1989
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