Dead time compensation for interpolative-type, control systems

Signal transmission in control structures is usually characterized by propagation processes, i.e. existence of time delays. For the interpolative-type control structures the problem is often disregarded, especially in the design step. Undoubtedly, the effect consists in worse real performances that those designed. In this context, the present paper proposes and presents a solution able to compensate, via a discrete-time PD compensator, the effect of the dead times appeared on the feedback channels for both a fuzzy and an interpolative control structure. For systems with variable time delays an adaptive-interpolative type PD compensator is suited. Experimental results, obtained through simulation on a second order positioning system, validate the proposed solution. Finally, the paper discusses the issue of the accuracy of simulation. It is emphasized the manner in which the simulation can be done using initial segment generators for the elementary dead time transfer elements.