packageBondLib

Information

When modeling systems in this fashion, it is common to hide many connections behind the bondgraphic connectors. To this end, one first places neighboring connected elements next to each other

making the connection between the connectors. The two models are then shifted together, until the two connectors are in the same position on the screen

thereby hiding the connection from view.

Bond graphs are described in terms of four basic variables:

1. efforts (e),
   
2. flows (f),
   
3. generalized momentums (p), and
   
4. generalized positions (q).

The four variables are related to each other in the following fashion:

Power is always the product of effort and flow:
P = e*f

The three basic OnePort elements of the bond graph methodology are:

1. resistors (R): e = R(f),
   
2. capacitors (C): e = C(q), and
   
3. inductors (I): f = I(p),

where R, C, and I can be arbitrarily non-linear functions operating in the first and third quadrants only.

Bond graphs are domain independent. The four basic variables of a number of physical domains are summarized below:

References:

1. Cellier, F.E. (1991), Continuous System Modeling, Springer-Verlag, New York, ISBN: 0-387-97502-0, 755p.
2. Cellier, F.E. (1992), "Hierarchical Non-linear Bond Graphs: A Unified Methodology for Modeling Complex Physical Systems," Simulation, 58(4), pp. 230-248.
3. Cellier, F.E. (1995), "Bond Graphs: The Right Choice for Educating Students in Modeling Continuous-time Physical Systems," Simulation, 64(3), pp. 154-159.
4. Cellier, F.E. and R.T. McBride (2003), "Object-oriented Modeling of Complex Physical Systems Using the Dymola Bond-graph Library," Proc. ICBGM'03, 6^th SCS Intl. Conf. on Bond Graph Modeling and Simulation, Orlando, Florida, pp. 157-162.
5. Cellier, F.E. and A. Nebot (2005), "The Modelica Bond Graph Library," Proc. 4^th Modelica Conference, Hamburg, Germany.

Main Author:

Prof. Dr. François E. Cellier
Institut für Computational Science
ETH Zürich
ETH Zentrum CAB G82.1
CH-8092 Zürich
Switzerland

Phone: +41(44)632-7474
Fax: +41(44)632-1374
Email: FCellier@Inf.ETHZ.CH
URL: http://www.inf.ethz.ch/~fcellier/

Release Notes:

• Version 1.0: February 10, 2005
  
• Version 1.1: June 21, 2005
  
• Version 1.2: November 21, 2005
  
• Version 1.3: December 13, 2006
  
• Version 2.0: July 18, 2007
  
• Version 2.1: August 2, 2007
  
• Version 2.2: August 30, 2007
  
• Version 2.3: September 24, 2007

Copyright (C) 2005-2007, François E. Cellier.

The ModelicaAdditions.BondLib package is free software; it can be redistributed and/or modified under the terms of the Modelica license, see the license conditions and the accompanying disclaimer in the documentation of package Modelica in file "Modelica/package.mo".

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