The previous result relies on the assumption of exponentiality of failure interarrival and service times [i.e., (t)=and (t)=]. Often this is not the case in practice. Gross (1976) studied the sensitivity of the model to the exponentiality assumption and derived some rules of thumb for the estimation of the error induced by the assumption.The models and methods presented so far require at least the knowledge of the lifetime density function for each component. If the available field data lacks the accuracy or the quantity required for the extraction of the lifetime density function, but is sufficient to extract the spare parts consumption or demands at the storehouse, then forecasting techniques can be applied to determine the number of spare parts to provision.
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