Abstract
The instability of global economic would affect us in many aspects. For some important mission-oriented systems, if the decision-makers does not make the adequate budget preventively, the systems could not undergo the maintenance in time and then unimaginable disasters would occur. Therefore, we firstly consider the discount rate of cost, and extend the age replacement policies of mission-oriented systems with discounting. To balance the maintainability and cost, the replacement first and replacement last are analyzed respectively. Furthermore, the effectiveness of the suggested policies are verified via the numerical examples. Finally, we illustrate the suggested policies in maintaining the electronic radar system of warning aircraft based on the assumed data. It can provide a better guidance for the engineers to maintain the mission-oriented systems when the economic is changed a lot.
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