Concluding Remarks
For the system required to perform randomly arriving tasks during a fixed mission duration, an availability measure called random-request availability has been proposed. The stochastic model provides closed-form mathematical expressions, which incorporate three basic elements: the random task arrivals, the system state, and the operational requirements of the system.
The characteristic of the random-request availability is that the random task arrival is included as one of the system elements. Using a simulation method, the effect of the “task arrival” element on the random-request availability has been investigated.
If the mean number of task arrivals grows, the computational complexity for deriving the random-request availability becomes extremely high. A simple approximation metho based on the conventional interval availability is suggested. Its accuracy varies according to the operational requirements of the system, the average task arrival rate, and the average number of on-off cycles (M) during the mission time.
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Lee, K.W. (2003). Random-request Availability. In: Pham, H. (eds) Handbook of Reliability Engineering. Springer, London. https://doi.org/10.1007/1-85233-841-5_35
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DOI: https://doi.org/10.1007/1-85233-841-5_35
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