SAMPLING PROCEDURES AND TABLES FOR LIFE AND RELIABILITY TESTING BASED ON THE WEIBULL DISTRIBUTION (MEAN LIFE CRITERION)
ASSISTANT SECRETARY OF DEFENSE (SUPPLY AND LOGISTICS) WASHINGTON DC
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A proposed acceptance-sampling procedure is presented together with tables of sampling plans for life and reliability testing when the underlying life distribution of items is of the Weibull form. The procedures and plans are for use when inspection of the sample items is by attributes with the life test truncated at some specified time. Lot quality is evaluated in terms of mean item life. A set of conversion factors is provided from which attribute sampling-inspection plans of any desired form may be designed for the Weibull model or from which the operating characteristics of any given plan may be determined. A comprehensive collection of Weibull sampling-inspection plans was designed. Also included are tables of ratios for adapting the Military Standard 105B plans to life testing and reliability applications. In all three of these elements of the study and the report, the exponential model is included as a special case of the Weibull distribution. Both the procedure and plans are for products for which the value for the Weibull shape parameter is known or can be assumed. Conversion factors and tables are provided for a wide range of values for this parameter.
- Manufacturing and Industrial Engineering and Control of Production Systems