System Efficiency Measurement through Bond Graph Modeling

Keywords

Abstract

Bond-graph modeling is a method of modeling a physical system by mapping the power flow through the system. Generally the power flow information of a bondgraph is used to develop the equations of motion for a given system. In this paper, the power flow information of a bond-graph is used in a very different way. This paper presents a method, in which the power flow information is used to monitor the effectiveness of a control scheme. The energy output of a system divided by the energy put into the system gives a feel for the efficiency of the system.

This paper shows, by means of an example, a method in which a bond-graph model can be used to compare a system’s response to its thermodynamic theoretical limit. Two separate control schemes are shown and the system responses are compared. A comparison of the effectiveness of two controllers is made by observing their ability to utilize the power supplied by the motor. By monitoring the power flow through the bond-graph, for a given controller, one can get an idea of the controller’s ability to effectively use the energy available to the system.

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Last modified: July 12, 2005 -- © François Cellier