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Semi-Markov Model Of Maintenance Of Urban Transport Buse

100%

Landowski B.

tom Vol. 4, no 2

161-168

The object of the investigations is maintenance system of urban transport buses. The subject of the investigations is a determined set of the maintenance states of means of transport and their maintenance processes, as well as the relations occurring between the aforementioned elements, and between them and the maintenance process effectiveness. The paper deals with the selected issues related to modelling, forecasting and controlling the maintenance process of a certain class of technical objects being carried out in a complex maintenance system. Supporting a decision maker in the decisions making process concerning the maintenance system under analysis is to forecast the maintenance system behaviour and evaluate the influence of the selected decision making variants on the course of the maintenance process. The purpose of the work is to present a possibility to use a semi-Markov model of maintenance process of technical objects to preliminarily forecast the state of the maintenance system after changing the values of the model input parameters. Changing the value of the input parameters may simulate an impact of various factors on the system behaviour. The paper presents the assumptions to build a model of the process being performed within the investigation object and the method of analysing it. The values of the model parameters were assessed on the basis of the results of the preliminary test carried out in a real means of transport maintenance system. All the considerations have been illustrated by a computational example. Due to the assumed generalization degree of the description, the method to model and forecast the maintenance process presented herein may be used to other maintenance systems than the urban bus transport system.

Operations & Maintenance of the aircraft arresting gear systems in the Polish Air Force. Part 1

51%

Adamowicz M. , Poświata A. , Wesołowski M.

2021

tom Vol. 51, iss. 1

105--124

In the article, the authors reviewed the arresting gears used in military aviation. The second part of this part describes the operation concept that is used in the Polish Air Force, in relation to the two types of gears, namely the post-Soviet ones that are still in service, and the second one: of U.S. production obtained due to the purchase of F-16 aircraft. The authors emphasize that in the case of an appropriate operation system, it is possible to extend the service life of devices and maintain safety of the air operations.

W artykule autorzy dokonali przeglądu urządzeń awaryjnego hamowania użytkowanych w lotnictwie wojskowym. W drugiej części został opisany system eksploatacji tych urządzeń, jaki funkcjonuje w lotnictwie Sił Zbrojnych RP, w odniesieniu do dwóch rodzajów tych urządzeń: eksploatowanych jeszcze poradzieckich oraz produkcji amerykańskiej, pozyskanych w związku z zakupem samolotów F-16. Autorzy zaznaczają, że w przypadku właściwego systemu eksploatacji istnieje możliwość wydłużenia okresu użytkowania urządzeń ponad określony przez producenta bez obniżenia poziomu bezpieczeństwa zabezpieczanych operacji lotniczych.