RESEARCH PAPERS: Additional Technical Papers

A Bond Graph Modeling Philosophy for Thermofluid Systems

[+] Author and Article Information
Dean Karnopp

Department of Mechanical Engineering, University of California, Davis, Calif.

J. Dyn. Sys., Meas., Control 100(1), 70-75 (Mar 01, 1978) (6 pages) doi:10.1115/1.3426342 History: Received January 30, 1978; Online July 13, 2010


The unification that bond graph methods bring to the representation of mechanical, electrical, magnetic, and chemical kinetic systems is not completely achieved for fluid flow systems except in the special case of high pressure hydraulic systems. This is because power in fluid systems is not merely the product of two variables such as pressure and volume flow rate, but rather contains components due to the convection of internal and kinetic energy. Using a Lagrangian description rather than the more usual Eulerian description, however, normal bond graph elements succeed in representing fluid and thermal interactions. The approach leads to novel ways of simulating systems in which convection is important. Variable transport delay and dispersion are handled in a way preserving physical intuition since fixed quantities of matter are followed through the system.

Copyright © 1978 by ASME
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