A Study of the Application of the Lognormal and Gamma Distributions to Corrective Maintenance Repair Time Data.

Abstract

The usual mathematical formulation of availability assumes an exponential distribution for failure and repair times. While this is sometimes correct for reliability, it is not likely to be for maintainability. This study was conducted to verify that the lognormal and gamma distributions are suitable descriptors for corrective maintenance repair times, and to estimate the difference caused in assuming an exponential distribution for availability and maintainability calculations when in fact the distribution is lognormal. Forty-six sets of repair time data of electronic and mechanical systems and equipments were analyzed using the methods of probability plotting and statistical testing for distributional assumptions.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1982
Accession Number
ADA124632

Entities

People

  • Ergam Camozu

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Chi Square Test
  • Data Analysis
  • Data Mining
  • Data Science
  • Data Sets
  • Fuselages
  • Goodness Of Fit Tests
  • Information Science
  • Maintenance
  • Normal Distribution
  • Probability
  • Probability Density Functions
  • Random Variables
  • Statistical Analysis
  • Statistical Tests
  • Test Methods

Fields of Study

  • Engineering

Readers

  • Facility/Structural Engineering.
  • Life Cycle Cost Analysis
  • Regression Analysis.

Technology Areas

  • Microelectronics