This paper presents the BONDYN program (BONd graph DYNamics) as a procedure for simulating dynamic systems. It is based on bond graph theory and provides a means for treating dynamic systems that simultaneously include various physical domains. The program makes use of the bond graph module handling facility in order to build a general model starting from simple submodels. Although the latter can be defined by the user, a library has been appended to the preprocessor which includes some of these submodels. Special developments for simulating multibody systems can be found among them. Once the overall bond graph has been assembled the program builds the state equations of the system in the form of a subroutine that can be accepted by a high level language compiler, which is FORTRAN 77 in this case. Simulation outputs can be shown either graphically or in a table.

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