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Współczynnik gotowości systemu lokomotyw spalinowych serii SM48

100%

Maciejczyk A. , Zdziennicki Z.

tom R. 19, nr 9

1445--1451, CD

W artykule wyznaczono współczynniki gotowości systemu dla różnych układów eksploatacji spalinowych lokomotyw serii SM48. Współczynniki gotowości systemu wyznaczono stosując aparat procesów Markowa.

The paper presents availability for the systems of SM48 diesel locomotives. There was used Markov analysis to solve the problem.

Comparative analysis of results of application of markov and semi-Markov processes to reliability models of multi-state technical objects

100%

Rudnicki J.

tom Vol. 11, no 1

169--181

During rational operation of technical objects and systems various operational decisions are made and decision-making process itself should be consisted in selecting that considered most favourable out of all possible to be taken. Choice of such decision is possible after taking into account many different information items but it never be completely correct without accounting for data and indices dealing with reliability. In the case when probabilistic principle of failure occurrence is determined , values of reliability indices can be estimated by using reliability mathematical models. During operation of many technical devices and systems ( e.g. ship main propulsion systems ) was observed many times the fact that their correct operation time is not a unique measure of their wear. Therefore for description of their serviceability and reliability can be used models of change of their reliability states in the form of semi-Markov processes based on the assumption of multi-state character of technical objects. This paper presents a comparative analysis of results of simulation reliability tests of a hypothetical technical object , obtained with the use of reliability models in the form of Markov processes and semi-Markov ones, corresponding to them, called also “half-Markov” processes.

Comprehensive interpretation of safety of wide water supply systems

84%

Zimoch I. , Łobos E.

tom Vol. 38, nr 3

107--117

A comprehensive method for safety assessment of water supply systems has been presented. The method includes both conditions of technical exploitation and quality of water delivered to consumers. In the analysis, the system capacity, appearance of failures on water mains as well as the chloroform concentration in transported water were taken into consideration. Four disjoint safety states have been defined (FS - full safety, ASM - acceptable safety menace, CSM - controlled safety menace, SL - safety loss) of water supply system. Moreover, the probabilities for the system to be in each of these states at the moment t were derived based on the Markov processes.

Markowski model procesu eksploatacji samochodów z oczekiwaniem

67%

Kruk Z.

2021

tom Vol. 51, iss. 1

213--223

Artykuł dotyczy modelowania eksploatacji samochodów z oczekiwaniem na użytkowanie. Taką specyficzną własnością charakteryzuje się proces eksploatacji samochodów systemie wojskowym. Przedstawiony model procesu eksploatacji samochodów z oczekiwaniem, przy zastosowaniu teorii łańcuchów Markowa zawiera istotne dla specyfiki eksploatacji pojazdów z oczekiwaniem wskaźniki i mierniki, tj. wadliwość napraw, intensywność napraw, intensywność użytkowania oraz intensywność uszkodzeń. Model ten pozwala na kwantyfikację wpływu wprowadzonych zmian w praktyce eksploatacyjnej lub wpływu zmian planowanych jako prognoza, co przedstawiono na przykładach.

The article is dedicated to the modelling of operations & maintenance of vehicles scheduled to be operated. This specific feature is illustrative of the vehicle operation process in the military system. The presented model of the operation process of vehicles scheduled to be operated, using the Markov chain theory, contains indicators and measures essential for the vehicle operation, i.e. repair defectiveness, repair intensity, usage intensity and failure intensity. This model enables to quantify the impact of the introduced changes in operational practice or changes planned as a forecast, which is shown in the examples.