期刊
MATHEMATICS
卷 10, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/math10091360
关键词
task abort; time redundancy; task success probability; system survival probability
类别
资金
- National Natural Science Foundation of China [72131002, 72001026, 71971026]
- Science and Technology Innovation Project of Beijing Institute of Technology [2021CX01022]
This paper focuses on the optimal adaptive maintenance and task abort strategies for continuously degraded systems, considering two types of time redundancy. It evaluates the task success probability and system survival probability using an event-based numerical algorithm. The study investigates the optimal imperfect maintenance and task abort thresholds dynamically in each attempt to minimize the expected total cost of maintenance, task failure, and system failure.
For many practical systems that are required to perform critical tasks, it is commonly observed that tasks can be performed multiple times within a limited time to improve task success probability. Such property is referred to as time redundancy. This paper contributes by studying the optimal adaptive maintenance and the task abort strategies of continuously degraded systems considering two kinds of time redundancy to improve system safety and task reliability. The task abort decision is considered dynamically according to the degradation level and the number of task attempts. Task success probability and system survival probability under two kinds of time redundancy are evaluated using an event-based numerical algorithm. The optimal imperfect maintenance and task abort thresholds are investigated dynamically in each attempt to minimize the expected total cost of maintenance, task failure and system failure. The established model in this study is illustrated by numerical results.
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