Impact of Control System Structure and Performance of Inventory Goods Flow System with Long-Variable Delay

  • Ewelina Cholodowicz West Pomeranian University of Technology Szczecin
  • Przemyslaw Orlowski West Pomeranian University of Technology Szczecin
Keywords: Inventory control, Delay systems, Discrete-time systems, PD control.


In this paper, we use a mathematical model of a inventory system with time-varying delivery delay and three control systems  in order to compare their properties for the goods flow optimization problem in the inventory systems.

Structures of the chosen control systems are based on mathematical discrete equations: a periodic inventory system with adaptive maximal inventory level and perpetual inventory system with adaptive order quantity level as well as the methods proposed by the authors in previous works based on the Smith predictor. The selection of the control systems parameters is done by solving optimization tasks for a specific scenario of time-varying market demand using a genetic algorithm in Matlab/Simulink.

In this article, we mainly want to compare which of the control structures is able to achieve a high service level with maintaining of a given inventory maximal level in response to assumed consumer demand scenario.


Author Biographies

Ewelina Cholodowicz, West Pomeranian University of Technology Szczecin
student of Automation Engineering and Robotics at Department of Control and Measurement
Przemyslaw Orlowski, West Pomeranian University of Technology Szczecin

Department of Control and Measurement, Assoc. Prof.