Underpinning system availability then are the

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Unformatted text preview: rs and the application of specialized models described in the next section. 5.3.3 Availability and LogisticsSupportability Modeling One reason for emphasizing availability and logistics supportability in this chapter is that future NASA systems are less likely to be of the "launch-and-logistically forget" type. To the extent that logistic support considerations are major determinants of system effectiveness during operations, it is essential that logistics support be thoroughly analyzed in trade studies during the earlier phases of the project life cycle. A second reason is that availability and logistics supportability have been rich domains for methodology and model development. The increasing sophistication of the methods and models has allowed the system-wide effects of different support alternatives to be more easily predicted. In turn, this means more opportunities to improve system effectiveness (or to lower life-cycle cost) through the integration of logistics considerations in the system design. Availability models relate system design and integrated logistics support technical attributes to the availability component of the system effectiveness measure. This type of model predicts the resulting system availability as a function of the system component failure and repair rates and the logistics support resources and policies. (See sidebar on measures of availability.) Logistics supportability models relate system design and integrated logistics support technical attributes to one or more "resource requirements" needed to operate the system in the accomplishment of its goals and objectives. This type of model focuses, for example, on the system maintenance requirements, number and location of spares, processing facility requirements, and even optimal inspection policies. In the past, logistics supportability models have typically been based on measures pertaining to that particular resource or function alone. For example, a system's desired inventory of spares w...
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This document was uploaded on 02/26/2014 for the course E 515 at University of Louisiana at Lafayette.

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