Abstract
A method is presented to determine simple transfer functions describing the input-output properties of continuous linear time-invariant systems. These transfer functions belong to a certain class of models including rational fractions and the transcendental function concerning time-lags. The evaluation of such models is based on the graphical representation of the logarithmic frequency plots (Bode-plots) of the given system in a fixed frequency range. The problem is then treated as an approximation problem in that sense that one fits the magnitude plot as well as the phase plot of the unknown model to the given plots in an interactive graphics dialog.
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