• AIR877

• 1993-01-01

• Historical. Access the latest revision: AIR877C

• A-6c1 Contamination And Filtration Committee

This 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-log 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.

• SAE AIR 877

• Aerospace

• Lubricant contamination
• Fluid power systems
• Hydraulic systems
• Hydraulic fluids
• Safety
• Tests and Testing