Abstract
Abstract This paper proposes a new strategy to improve the reliability of phased mission systems (PMS), namely, by swapping of components. In the proposed strategy, when a component fails, it can be swapped by another one in the system which is still functioning. We consider both the options to swap components at any time and for swaps to be possible only at phase transitions. This paper also discusses the strategy of swapping components according to structure importance. The structure importance is used to measure the importance level of the components in contributing to system reliability. Then, when a component with high importance fails, it is swapped by another component with lower importance from the system which has not yet failed. The survival signature methodology is implemented to assess the reliability of PMS when there is a possibility of components swapping. In addition, we consider the cost effectiveness of component swapping through two models (time independent and time dependent) of penalty costs for PMS.
Highlights
A phased mission system (PMS) is defined as a system which performs a series of tasks in consecutive and nonoverlapping periods
We consider the effect of the defined swaps, either if they are applicable at any time during the mission or only at transitions of phases, into account through the PMS structure function, and it can be taken into account for computation of the system reliability through the PMS survival signature
Comparing these results with the results in Example 2 in which the components are swapped upon failure, we find that the reliability in phase 1 and 2, if the components 1 and 2 are swappable, and the components 3 and 4 are swappable according to their structural importances are exactly the same as if these components are swapped upon failure, in phase 3, the results are different
Summary
A phased mission system (PMS) is defined as a system which performs a series of tasks in consecutive and nonoverlapping periods (phases). We discuss the strategy of swapping components according to structure importance, as an example of a method to decide which components may be considered for swapping It is attractive if we can consider the possibility of swaping components at any time during the mission. We use the survival signature methodology for PMS, as introduced by [10], to analyse the effect of swapping components on the PMS reliability when the components can be swapped at any time during the mission or only at transitions of phases. We establish models for evaluating the expected costs for the PMS if there is a possibility to swap components at any time during the mission or only at transitions of phases. A further example would be sound or light systems for concerts, where spare parts or equipment may not be available but the position of a failing component may be more crucial than of another component, which could possibly be quickly swapped into the location of the failed component, this may only be possible at an interval in the performance
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Schedule a callMore From: ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part B: Mechanical Engineering
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