A study on reliability and maintenance scheduling of bus engines of a public transport company

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A study on reliability and maintenance scheduling of bus engines of a public transport company


Author: Wu, Chi-ho Leo
Title: A study on reliability and maintenance scheduling of bus engines of a public transport company
Degree: M.Sc.
Year: 1998
Subject: Buses -- China -- Hong Kong -- Maintenance and repair -- Case studies
Kowloon Motor Bus Company (1933) Limited
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: [8], 60 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1421101
URI: http://theses.lib.polyu.edu.hk/handle/200/1722
Abstract: This report describes a study on the reliability, planned maintenance and scheduling of diesel engine in Kowloon Motor Bus (KMB) Company Limited. A mathematical replacement model for engine is developed to maximize the reliability & availability and to find the optimal replacement period. A stochastic programming is also developed to find the maintenance scheduling and stock level of engines. Kowloon Motor Bus (KMB) Company Limited is the biggest franchised bus companies in Hong Kong. Currently, there are two kinds of maintenance services for its buses. One is the daily maintenance service and the other is monthly maintenance service. In order to let the bus travel safety and smoothly, the condition of a bus engine needs to be in a good condition. This depends on the maintenance policy employed. Through daily inspection, the servicing buses can be made sure to travel with good engines and, through monthly inspection, the faults which are not detected in daily inspection can be found. Consequently, these two policies can ensure the servicing engines being in good condition. Under current maintenance policy, most faults of engine can be found in daily inspections and the undetected faults can be found in monthly inspections. Thus, current policy of replacement at break-down is sufficient and the preventive replacement is not needed for the engines. Because of Certificate of Fitness (CFO) Overhaul, KMB is required to arrange buses for annual inspection. In the stochastic programming model, there are two approaches. One approach is to minimize the sum of deviation between the monthly stock level and the mean (minimizing XD approach). The other is to maximize the mean of total monthly available stock level (Maximizing XM approach). It is found that minimizing XD approach is better than maximizing XM approach. If the management adopts the minimizing XD approach, the monthly stock level can be kept in the standard level and there are less variation in the monthly stock level. This makes the operations of the depot running smoothly and steadily.

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