Performance characteristics of rotor-support systems are
always evaluated (numerically and experimentally) by assuming
an ideal environment, including high-quality oil and adequate
cooling systems. However, oil contamination is common in rotating
machinery and may have detrimental effects on performance,
leading to a reduction in service life. Moisture, dust, wear debris,
water and fuel represent the most common oil contaminants.
Their presence in lubrication systems may result in excessive wear
and – in more severe cases – bearing failure. It has been reported
that oil contamination contributes to about 14% of bearing premature
failures