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Alexandru CODREAN


The paper discusses the elementary problem of accurate modelling of the most simple elements with dead time in the idea of using simulation environments based on block diagrams, in this case the Matlab / Simulink environment. The kernel aspect is that of reconsidering the set of values of the output signal ordered in time and stored in the memory of these systems for a time interval of length equal to the dead time. This set of values is called the initial segment. The paper argues by examples this aspect, presenting the manner in which the modelling can be done correctly using the possibilities offered by the Matlab / Simulink environment, draws attention to the errors that may appear in the simulation operations by not using the initial segment and presents two case studies regarding control loops that contain elementary subsystems with dead time.

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