Standard

SAE AIR877C

Published

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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.

Document information

  • Standard from SAE_AC
  • Published:
  • Version: 0
  • Document type: IS