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6.2. Diagnostics and prognostics capabilities
In assessing the diagnostics and prognostics capabilities of the AE, SOA and vibration monitoring
techniques for gear teeth surface pitting wear, the following questions arise:
(1) Which is the best indicator for monitoring pit growth?
(2) How does load affect the various indicators?
(3) What is the prognostic potential of these technique?
6.2.1. Which is the best indicator for monitoring pit growth?
Clearly, there existed an initial period during which the gear teeth surface smoothened out, oil sump
temperatures increased and dynamic stabilisation of the rotating systems (such as bearing, alignments, etc.)
took place. Because of the complexity involved during this process, it was deemed inappropriate to relate any
of the monitoring indicators to this period; 0–15 h. However, after this initial period defined as wear-in, the
monitoring indicators behaved differently with pit progressions. As discussed earlier, AE rms levels exhibited a
linear relationship with running time (as observed from AE measurements taken from the gear after the run-in
period), which was not necessarily the case for vibration, SOA and AE (bearing casing) observations.
6.2. Diagnostics and prognostics capabilities
In assessing the diagnostics and prognostics capabilities of the AE, SOA and vibration monitoring
techniques for gear teeth surface pitting wear, the following questions arise:
(1) Which is the best indicator for monitoring pit growth?
(2) How does load affect the various indicators?
(3) What is the prognostic potential of these technique?
6.2.1. Which is the best indicator for monitoring pit growth?
Clearly, there existed an initial period during which the gear teeth surface smoothened out, oil sump
temperatures increased and dynamic stabilisation of the rotating systems (such as bearing, alignments, etc.)
took place. Because of the complexity involved during this process, it was deemed inappropriate to relate any
of the monitoring indicators to this period; 0–15 h. However, after this initial period defined as wear-in, the
monitoring indicators behaved differently with pit progressions. As discussed earlier, AE rms levels exhibited a
linear relationship with running time (as observed from AE measurements taken from the gear after the run-in
period), which was not necessarily the case for vibration, SOA and AE (bearing casing) observations.
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