Accession Number:

AD0839460

Title:

SMALL SAMPLE ACCEPTANCE SAMPLING TABLES USING B10 RELIABLE LIFE AND B10 HAZARD RATE CRITERIA BASED ON THE WEIBULL DISTRIBUTION.

Descriptive Note:

Research and development rept.,

Corporate Author:

DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Personal Author(s):

• Fisk, Donald J.

Report Date:

1968-08-01

Pagination or Media Count:

71.0

Abstract:

Acceptance criteria are established for B sub 10 reliable life and B sub 10 hazard instantaneous failure rate, assuming that a Weibull failure time distribution with shape parameter 0.6 or beta or 2.0 applies. B sub 10 reliable life is the time at which 90 of all items are expected to be still in operation, and B sub 10 hazard rate is the number of failures per unit - time hours, cycles, etc expected at B sub 10 life. Acceptance sampling plans based on the binomial probability distribution have been developed, for each criterion, using sample sizes of 2 or n or 50, and acceptance numbers of 0 or c or n-1, c or 8, to assure, with minimum confidence of 90 andor 95 the acceptance of lots for which the survival probability is 90 or more, at some specified time, t. Comparisons between B sub 10 reliable life and B 10 hazard rate indicate that either may be used with equal facility as acceptance sampling criteria. However, B sub 10 hazard rate estimated would be most appropriate for establishing correction factors to compare basic environmental test results, with results obtained under other than basic conditions. Author

Descriptors:

• *RELIABILITY
• *STATISTICAL ANALYSIS
• STATISTICAL DISTRIBUTIONS
• STATISTICAL TESTS
• CONFIDENCE LIMITS
• CORRELATION TECHNIQUES
• SAMPLING
• PROBABILITY
• QUALITY CONTROL
• ACCEPTABILITY
• LIFE EXPECTANCY(SERVICE LIFE)
• FAILURE(MECHANICS)
• BEARINGS
• TABLES(DATA)

Subject Categories:

• Statistics and Probability
• Manufacturing and Industrial Engineering and Control of Production Systems
• Machinery and Tools

Distribution Statement:

APPROVED FOR PUBLIC RELEASE