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SAE AIR877

Revision C, September 1, 2012

Complete Document

Aerospace-Particle Count Data Conversion and Extrapolation

Includes all amendments and changes through Stabilization Notice (No longer revised / updated) , September 2012


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Product Details:

  • Revision: Revision C, September 1, 2012
  • Published Date: September 2012
  • Status: Active, Most Current
  • Document Language: English
  • Published By: SAE International (SAE)
  • Page Count: 8
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

This SAE Aerospace Information Report (AIR) describes a mathematical model that can be used to analyze partial count data. Particle counts that fit the model can be graphically displayed, converted from one counting size-frequency range to another, and extrapolated to estimate counts beyond the measured range. Derivation, applications, and calculations are described.

Outline of Method:

Cumulative particle counts larger than stated size-range are fitted against a modified long-normal distribution function by plotting on special log-log2 graph paper. Many real particle distributions approximate a straight line, shoeing good fit for this long-normal model. The resultant plot provides a basis for further analysis, including size-range conversion and extrapolation.
AIA/NAS Aerospace Standards