SAE AIR877C ✓ Most Recent

This SAE Aerospace Information Report (AIR) describes a mathematical model that can be used to analyze particle 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.

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

This document has been declared "Stabilized" by the SAE A-6C1 Contamination and Filtration Committee and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability of technical requirements. Newer technology may exist.

This document has been determined to contain basic and stable technology which is not dynamic in nature. It is basically a mathematical analysis of particle counts which will not change with the advent of new technology.