Abstract
The mission for a type of transportation system is to complete a certain transportation volume within a predetermined period, during which maintenance is also performed. In such a system, any unit selected to be maintained is often connected to the system to participate in the system operation immediately after its maintenance, and its participation in the system operation at different moments has different effects. Based on this consideration, this paper proposes a new selective maintenance model for a multi-state system wherein the maintenance sequence arrangement is considered. In this selective maintenance problem, to maximise the system reliability, a sub-set of all desired maintenance activities is selected, and the sequence of the selected maintenance activities to be performed is arranged, with the transportation volume requirement and the limited budget considered. An ant colony optimisation algorithm is tailored for the resulting optimisation problem. Two example analyses are presented to illustrate the effectiveness of the tailored ant colony optimisation algorithm and the effect of the proposed selective maintenance. The results show that the tailored ant colony optimisation algorithm is effective for the proposed selective maintenance model. This selective maintenance can significantly improve the system reliability when the predetermined period is relatively short, and this maintenance effect of improving the system reliability gradually weakens as the predetermined period becomes longer. Increasing the budget and decreasing the transportation volume requirement can slow this weakening of the maintenance effect.
Highlights
The inevitable deterioration and even failure of engineering systems during their operation make maintenance increasingly important to improve system reliability and prolong system life [1]
When selective maintenance was originally proposed, it was applied to a parallel-series system with only the replacement policy being considered [5]
The increase in T prolongs the operating time of the system, which counteracts the effect of maintenance and decreases RS T max
Summary
The inevitable deterioration and even failure of engineering systems during their operation make maintenance increasingly important to improve system reliability and prolong system life [1]. In this study, on the premise that the transportation volume meets its requirement, a sub-set of all desired maintenance activities is selected and the sequence of these selected maintenance activities to be performed is arranged, with the aim of maximising the system reliability within the limited resources. This is a type of selective maintenance, and the decision variable is a maintenance sequence. The main contributions of this study are as follows: 1) The selective maintenance model for a type of transportation MSS is first built, in which the maintenance sequence arrangement is considered.
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