Title: Management of inventory using control theory

Authors: A.S. White

Addresses: Advanced Manufacturing and Mechatronics Centre, School of Engineering Systems, Middlesex University, Bounds Green Road, London, N11 2NQ, UK

Abstract: This paper describes the systems approach to the management of inventory. It puts into context the use of System Dynamics (SD) and other Cybernetic models and outlines their advantages and disadvantages. The main objective of a systems examination is to understand how the organisation of a business affects its performance. Principally the SD method is concerned with causal relationships. Cybernetic models are used to find an analytic expression to describe the whole process, concentrating on the input and outputs to the system. Results of simple inventory management are shown to be examples of proportional control in conventional theory. Better control algorithms, such as proportional, derivative and integral (PID), are used to indicate a more sophisticated form of inventory control that can easily reduce stock levels by 80% and hence reduce cost. This has special significance for JIT and MRP methods.

Keywords: modelling; cybernetics; system dynamics; inventory; production control.

DOI: 10.1504/IJTM.1999.002754

International Journal of Technology Management, 1999 Vol.17 No.7/8, pp.847-860

Available online: 06 Jul 2003 *

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