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SAE AIR877 Revision C, September 1, 2012
Aerospace-Particle Count Data Conversion and Extrapolation
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.
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.
SAE AIR877 Revision C, September 1, 2012
Aerospace-Particle Count Data Conversion and Extrapolation