LIFETESTING TIME REQUIREMENTS TO ASSURE REQUIRED RELIABLE LIFE

Abstract

A procedure and associated tables are given of factors for use in determining the minimum lifetesting time required for sample items to provide assurance at a confidence level of 95% that the items in the lot or population from which the sample was taken meet the life requirements specified. The life quality of the lot or population is evaluated in terms of reliable life which is the life beyond which some specified proportion of the items will survive. Tables of factors are provided for three proportions or reliability indices; . 99, .90, and .50 (median life). In addition, another table of factors is provided for lot evaluation in terms of mean item life. The Weibull distribution is used as a failure model with the exponential distribution being included as a special case of the Weibull. Inspection of sample items is by attributes with the acceptance criterion being simply that no more than some specified number of items fail before the end of the minimum test time as computed by the use of the factors.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1962
Accession Number
AD0290588

Entities

People

  • Henry P. Goode

Organizations

  • Cornell University

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Cost Estimates
  • Costs
  • Electronic Components
  • Engineering
  • Equations
  • Government Procurement
  • Governments
  • Industrial Engineering
  • Inspection
  • Life Tests
  • Mechanical Components
  • Mechanical Engineering
  • New York
  • Reliability
  • Test And Evaluation
  • Test Facilities
  • United States

Readers

  • Psychometric Testing or Psychological Assessment.
  • Software Engineering
  • Statistical inference.