Abstract
Two methods of estimating the time between transmission overhauls and the number of replacement components needed were presented. The first method assumes replacement of all components during an overhaul of a failed transmission (full replacement method). The second method assumes replacement of failed components only (partial replacement method). Both methods assume the transmission components follow a two-parameter Weibull failure distribution. Renewal theory was presented to estimate the number of component replacements in a transmission for both methods. For the partial replacement method, renewal theory was used with the individual component life predictions to estimate the number of component replacements needed and the transmission time between overhauls. For the full replacement method, renewal theory was used with a transmission system life model to estimate the number of replacement transmissions needed and the transmission time between overhauls. Confidence statistics were applied to both methods to improve the statistical estimate of sample behavior. A transmission example was presented to illustrate use of both methods.
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