Interactive Software for Dynamic System Modeling Using Linear Graphs

William K. Durfee, Matthew B. Wall, Derek Rowell, Freel K. Abbott

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Lgraph is an interactive, graphical software package to create, modify, and reduce linear graphs. Linear graphing is a structured method to formulate and represent lumped-element, linear dynamic system models containing connected single-port energy storage, dissipative, and source elements and two-port transduction elements. Lgraph enables the user to place elements from several domains in a connected graph, and then computes and displays elemental equations, constraint (loop and node) equations, and state equations for the dynamic system, all in symbolic form. The package was implemented using X Windows graphics and runs on Unix-based engineering workstations. It is currently being used by undergraduate students in the Department of Mechanical Engineering at the Massachusetts Institute of Technology (M.I.T.).

Original languageEnglish (US)
Pages (from-to)60-66
Number of pages7
JournalIEEE Control Systems
Issue number4
StatePublished - Jun 1991


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