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Forbes T. Brown Department of Mechanical Engineering and Mechanics Became Professor Emeritus on September 1, 2004 Key Recent Publication: Brown, F.T. Engineering System Dynamics, a Unified Graph-Centered Approach, Second Edition (1078) pages and Instructor's Manual (215 pages), CRC Press, August 2006.
This is new software made available on a trial basis in December, 2007. It is intended to cover a very broad range of applications, but has been tested on a restricted set of examples only. The author would appreciate learning of any difficulties in its use. The MATLAB® function file Convec.m expedites the dynamic simulation of thermodynamic systems modeled with the help of convection bond graphs by automatically deducing and executing the associated differential equations for dynamic simulation. Such graphs are described in Chapter 11 of the second edition of Engineering System Dynamics, a Unified Graph-Centered Approach, by Forbes. T. Brown (CRC Press, 2007). The relatively new elements IRS, AC and RC have not yet been incorporated. Previously, including in the book, it was necessary for the user to write his or her own differential equations, using the bond graph as the principal guide, as illustrated in the book. Convec.m also works for bond graphs with some or all simple bonds, although it is inconvenient when the associated elements are nonlinear. The user starts by drawing a bond graph, using integral causality. He or she next numbers the elements in the graph and constructs a matrix that describes their characteristics. Then, the bonds in the graph also are numbered, and a second matrix is constructed that describes their details. Initial conditions for the simulation are specified, and its duration given. These concise descriptions are entered into the program called convectemplate.m, which can be renamed after the system being modeled, and when run automatically calls the function file convec.m and carries out the simulation. You then may request a display of whatever results you wish. Six example systems are given. Detailed instructions and explanations are available. Click on a file name (in red) to download the file. Click here for Instructions and Explanation of the Simulation Package for Convection Bond Graphs
As a prerequisite for using this package, the user must also download at least the relevant files from the Thermodynamics Properties Package, which are listed subsequently below. This includes the new file airmix.m (#12 in the list), which treats wet air as a mixture of nitrogen, oxygen, argon and water, and the newly updated files therprop.m, vapor3.m, vapor6.m, vapor7.m datammonia.m and datwater.m (#1, #4, #6, #8, #13 and #49, respectively). Also the corrected file orificenew.m, which heads the list in the group of files “Upgraded or PDF files” should be downloaded. The files are listed below, and can be downloaded individually by clicking on the file name. More files may be added at a later date, for example for certain modern refrigerants. Click here for Instructions and explanation of the Thermodynamic Properties Package
Click for Errata for Second Edition Downloadable files cited in Edition 2 Any of the following MATLAB® files as listed on p. 1018 in the book may be downloaded by clicking on its file name in the table below. Several other files regarding assignable problems are listed in the Instructor's manual.
Upgraded or new MATLAB® or PDF files: Additional downloadable files are given in the table below; others may be added later. The first, third, fourth, fifth and seventh entries are revised from an earlier listing. "TPP" refers to the Thermodynamic Properties Package.
Click here for Further Explanation of files dated 8/16/06 Click here for Explanation of files for paper of January 2007 Click here for Further Explanation of files dated 2/20/07 Other Recent Publications: Brown, Forbes T., "Bond Graph Modeling and Simulation of Thermodynamic Systems," invited presentation for the plenary session of the 2007 International Conference on Bond Graph Modeling and Simulation, San Diego, CA, a PowerPoint presentation downloadable (see January 1, 2007 in table above) as a pdf file. The abstract is published on pages v and vi of the Proc. of ICBGM 2007. Brown, Forbes T. "Modeling and Simulation of Ferromagnetic Hysteresis," to be published in 2007 International Conference on Bond Graph Modeling and Simulation, Ed. F.E. Cellier, J.J. Granda, The Society for Modeling and Simulation International (SCS), Jan. 2007, pp. 129-135. See the files dated 10/1/06 in the table above, and "Explanation of files for paper of January 2007." Brown, F.T. "Hybrid Lumped-and Delay-Bond Modeling and Simulation," 2005 International Conference on Bond Graph Modeling and Simulation, Ed. F.E. Cellier, J.J. Granda, The Society for Modeling and Simulation International (SCS), Simulation Series, Vol. 37, No. 1, pp. 67-72. Brown, F.T. "Kinetic Energy in Convection Bond Graphs," 2003 International Conference on Bond Graph Modeling and Simulation, Ed. F.E. Cellier, J.J. Granda, The Society for Modeling and Simulation International (SCS), Simulation Series, Vol. 35, No. 2, pp. 191-197. Brown, F.T. "Simulating Distributed-Parameter Multiphase Thermodynamic Systems Using Bond Graphs," Proceedings of IMECE2002, 2002 ASME International Mechanical Engineering Congress and Exposition Symposium on Automated Modeling, November 17-22, 2002, New Orleans, LA. Brown, F.T. "Non-Iterative Evaluation of Multiphase Thermal Compliances in Bond Graphs," Proc. Instn Mech Engrs Vol 216, Part I: J. Systems and Control Engineering, 2002. Brown, F.T. Engineering System Dynamics, a Unified Graph-Centered Approach, Marcel Dekker, Inc. (1026 pages), 2001. Brown, F.T. and Tentarelli, S.C. "Dynamic Behavior of Complex Fluid-Filled Tubing Systems -- Part 2: System Analysis," Journal of Dynamic Systems, Measurement and Control, ASME Transactions, Vol. 123, No. 1, pp. 78-84, 2001. Brown, F.T. and Tentarelli, S.C. "Dynamic Behavior of Complex Fluid-Filled Tubing Systems -- Part 1: Tubing Analysis," Journal of Dynamic Systems, Measurement and Control, ASME Transactions, Vol. 123, No. 1, pp. 71-77, 2001.
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