D-decomposition method in the area of relative stability, developed from Loo [7] in order to separate constant time settling area in parametric space which ensures the system having predefined settling time.[4]. This paper develops the methods for synthesis and analysis of controlled-loop system with proportional regulator for transport and dosing devices with pre-defined damping factor. Here we presents and investigates the further expansion of last obtained results. Now it would be possible to separate the region in three-dimensional space (frequency ω (Hz), gain K=1/α and time delay constant (τ), so that adjustable parameters guarantee damping factor ξ of controlled system will have a priori defined value. Useful of this researches is that checking of obtained results can be made with MATLAB software package and the simulation of dynamic behaviour will be done with this package at the end. The verification of the system model could be done with this method in order the system will have as much as possible accuracy of working.

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