Spare Strategy Analysis for Life Support Systems for Human Space Exploration
Maxwell, Andrew J.
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Systems enabling long-duration crewed missions are expected to have high probabilities of success through sparing of components. To enable such systems, the tradeoff between the reliability and the mass needs to be incorporated early in the design phase to ensure that the requirements are optimally captured. Additionally, effective operational sparing policies need to be devised in the early design phase as a means to mitigate the negative impact in case the delivered system does not meet all of the requirements. In response to this background, this paper presents a new approach for analyzing the probability of sufficiency and spares mass with consideration of sparing policies. The developed method improves the current state-of-the-art tool from two perspectives. First, it develops a new method based on the modified knapsack problem to generate the spares allocations that maximize the probability of sufficiency given a mass capacity. Additionally, it develops a simulation model with a failure queue to enhance the flexibility of the state-of-the-art model to evaluate different sparing policies. With the developed method, comparative studies using two allocation approaches and two different policies are presented.