Abstract
The aim of this study was to analyze the impact of the categories of bus downtime caused by the necessity of their repair on the availability indicator. A retrospective study covering 12 years of bus operation was carried using the selected municipal transport company as an example. The share of the selected categories of downtime in the total time of vehicle downtime was analyzed. The Spearman’s rank correlation coefficient was used for the analysis. The research covered seven makes and types of buses and six categories of downtime. A ranking of the downtime categories was developed according to the criterion of the statistical dispersion of stoppage time as a measure of their unpredictability. It was shown that categorized unavailability was strongly dependent on the rank of downtime and loosely dependent on the age of buses. In practical applications, the test results may be useful in improving the fleet maintenance processes, selecting the make of new buses or development of models for safety margin availability.
Highlights
IntroductionThe availability of the transport system in general depends on the reliability and serviceability of vehicles and the conditions of their use, as well as the quality of the technical service [1–3]
The availability of the transport system in general depends on the reliability and serviceability of vehicles and the conditions of their use, as well as the quality of the technical service [1–3].AT = f (Rv, Mv, K, OZM ) (1)where AT—vehicle availability, Rv —vehicle reliability, Mv —vehicle serviceability, K—operating conditions, OZM —quality of technical services and repairs.The concept of availability is often used in rapid response systems when the moments of launching operational tasks are sudden, e.g., in the air force, ambulance services or the fire brigade [4–8]
Using Formula (4), the UTk categorized unavailability rate was calculated for the following categories: NB, ON, BCZ, NW, WS, and NN
Summary
The availability of the transport system in general depends on the reliability and serviceability of vehicles and the conditions of their use, as well as the quality of the technical service [1–3]. Where AT—vehicle availability, Rv —vehicle reliability, Mv —vehicle serviceability, K—. Operating conditions, OZM —quality of technical services and repairs. The concept of availability is often used in rapid response systems when the moments of launching operational tasks are sudden (unplanned), e.g., in the air force, ambulance services or the fire brigade [4–8]. The concept of using the availability criterion has gained wide recognition in the management of public transport companies. Companies want to reduce costs while guaranteeing business continuity. According to Formula (1), an increase in the availability of the transport system can be ensured by:
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