ANALYSIS OF REPRODUCIBILITY AND REPEATABILITY OF BEARING-LUBRICANT DEPOSITION RATINGS

Abstract

High temperature deposit and oil degradation characteristics of a series of turbojet lubricants were statistically analyzed. Intra-laboratory tests with three oils gave relatively large standard deviation values, but at the 95% probability level showed the oils to be significantly different in demerit value. Inter-laboratory (3 facility) tests of two of these oils showed that the demerit ratings obtained fell statistically within the single laboratory range. Correlation between demerit and other degradation factors for three well replicated oils indicated that the greater the demerit value the larger were the changes in viscosity, acid number, and oil loss. Viscosity change failed to show real correlation at low demerit levels. No correlation between demerit rating and viscosity change was apparent for a series of duplicate tests: A very minor degree of correlation appeared to exist for the comparison with oil loss and acid number.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1968
Accession Number
AD0830068

Entities

People

  • J. R. Gibson
  • Jeffrey C. Harris

Organizations

  • Monsanto

Tags

Communities of Interest

  • Human Systems
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Supplies
  • Degradation
  • Export Controls
  • Gas Turbines
  • Government (Foreign)
  • Governments
  • High Temperature
  • Information Science
  • Jet Aircraft
  • Laboratory Tests
  • Lubricants
  • Oil Tanks
  • Standards
  • Test Facilities
  • Test Methods
  • Turbojet Engines

Readers

  • Polymer Science and Engineering.
  • Regression Analysis.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).