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A bond graph is a graphical representation of a physical dynamic system. It allows the conversion of the system into a state-space representation.
The most important feature of the bond graph notation is that a bond explicitly represents power flow or energy transport and distinguishes it from signal flow, the transfer of information. Generally, the behavior of an element or system will be described mathematically as an
Henry Martyn Paynter (August 11, 1923 – June 14, 2002) was an American scientist and professor of mechanical engineering at Massachusetts Institute of Technology. He is best known as the inventor of bond graphs, a methodology to describe dynamic systems. [1]
BLOCK DIAGRAMS, BOND GRAPHS AND CAUSALITY The main purpose of modeling is to develop insight. “Drawing a picture” of a model promotes insight. Why not stick with the familiar block diagrams? Block diagrams provide a picture of equations; —they portray operators acting on signals. Bond graphs are related to model equations,
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In bond graph theory, this is represented by an activated bond. Activated bonds appear frequently in 2D and 3D mechanical systems, and when representing instruments.
A bond graph is a presentation of engineering systems on paper by conventional elements and their interconnections, called traditionally bonds; this is because of a vague and formal similarity with chemical bonds.
Energy can flow from one component to another. The rate of energy flow is called "power", and bond graphs are designed to make this easy to keep track of. The idea behind bond graphs is very simple. I've been describing various "n-ports" lately, and I've drawn pictures of them. In my pictures, a 3-port looked like this:
Bond graphs are labelled and directed graphs, in which the vertices represent submodels and the edges represent an ideal energy connection between power ports. The vertices are idealised descriptions of physical phenomena: they are concepts, denoting the relevant (i.e. dominant and interesting) aspects of the dynamic behaviour of the system.
This resource contains the description of summary of basic bond graph elements.