Use of delay-time concept in modelling process of technical and logistics systems maintenance performance

Abstract

execution time of (internal and external) placed customer's • order -specifying the time between the moment the order has been placed by the customer and its completion. In this case, the concept of time is relative to the level of supported enterprise performance as perceived by the customer, resource efficiency in the basic processes of the supported en-• terprise. For instance, in the case of manufacturing systems, the concept of time is directly related to minimizing downtime and optimizing capacity utilization, duration of various fundamental processes, covering the pe-• riod from the time when all resources necessary to perform the process are ready for use, until the moment the result of the process has been achieved. The concept of time directly depends on the thorough identification of the process structure.Therefore, accurate determination of the time relations in the logistic system will depend e.g. on the type of the modelled system (storage, transport, etc.), the type of operating task, the definition of the efficiency type that is essential in the system (e.g. whether one is interested in the system's efficiency within a certain time horizon), and the behaviour of the system during its downtime (whether a single failure should affect the reliability of the whole system). The basic classification of system models with a time resource, taking into account the above features, has been presented e.g. in [88, 89].The article focuses on the issues associated with the maintenance modelling of logistics systems using Delay Time Analysis approach, with particular emphasis on the methodology applying the concept of delay time in practice. The second part of the article focuses on the analysis of an internal transport system of a manufacturing company in the metallurgical sector. The proposed methodology was used to assess the reliability and the expected maintenance costs of the operating forklifts. Modelling of technical and logistical systems maintenance processes using delay time analysisThe papers published over the last 50 years cover a wide range of problems in the area of modelling and design of maintenance processes in technical facilities (maintenance theory). Issues often discussed in the literature regard the areas of reliability modelling or necessary supplies providing for operational processes performance of e.g. production and transportation systems (e.g. works [6, 46, 47, 65,72,75, 76]), or the uncertainty of operating data (e.g. works [7, 57, 93]). A basic overview of these research works was presented in one of the first articles - [62], and later developed and extended by the authors . The importance of the tasks related to the analysed research area as well as its diversity is supported by many studies (e.g. [18, 52, 53,54, 55, 61, 69, 77]), where the authors provide an overview of basic models of selecting an optimal maintenance strategy for both single-and multi-element systems. At the same time, papers focused to the issue of maintaining single-element systems have been analysed e.g. ...

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