Object oriented approach for large circuits with substructures in the computer algebra program maple V

During the past decade, there have been some significant advances in the area of computer algebra programs. Thus the symbolic calcuation of mathematical models becomes more and more common. Especially in the field of control theory most of the controller design methods require a symbolic description of the controlled plant. Furthermore, these models allow to investigate the effects of parameter variations on the system behavior in an easy manner. We will present an efficient method for the automatic derivation of the network equations in the computer algebra program maple V. Thereby only networks consisting of linear terminals are considered. The result can be a system of ordinary differential equations or transfer functions. Without great effort it is also possible to extend the network algorithm to handle systems with nonlinear terminals.