Modeling light valve replacements in a training unit : the spare demand process
Hollister, Michael A.
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This thesis utilizes data on the time to failure of individual light valves to represent the random process of all failures at a many-valve training unit. This process governs the demand for replacement spares. The light valve replacement model, with finite spares, is based on theoretical results concerning the Poisson tendency for a superposition of renewal processes. Graphical analysis and a simulation verify that the theory can apply under practical circumstances. The model is distinguished by its applicability for use in standard spreadsheets; no specialized statistical features are required.