HUMS2023 Data Challenge Result Submission
Team Name: KU LEUVEN
Team Members: Alexandre Mauricio, Rui Zhu, Konstantinos Gryllias
Institutions: KU Leuven, Department of Mechanical Engineering, LMSD
Publishable: Yes
1. Summary of Findings
The root crack is related to the harmonics of the Planet Gear, and in specific to the 2
nd
harmonic
(2xPG) as the root crack teeth mesh twice with each revolution, once on the ring gear and once on
the sun gear.
The carrier component is removed from the signal with synchronous averaging, to enhance the
signal to noise ratio of the planet gear. The envelope spectrum then exhibits the planet gear
modulations, and when the 2
nd
harmonic is consistently above the threshold, the root crack is
considered detected. With this method, the damage is detected in signal #309 for the
accelerometer RR4, and in signal #313 for the accelerometer RL3.
Using the information of 3 accelerometers instead of each one separated by averaging the
envelopes enhances the signal to noise ratio. The 2
nd
harmonic of the Planet Gear is consistently
detected above the threshold at signal #294.
Tracking the amplitude of the 2
nd
harmonic of the Planet Gear after the early detection (at signal
#294) provide a trending curve for prognostics purpose, showing an increasing monotonic
exponential curve until the end of the dataset and the breakdown of the gear.
Table 1 Summary of Analysis Results
1
Consistent detection on at
least one signal channel; i.e.
the fault indicators remain
consistently above the
threshold.
Day024_Hunting_SSA_20211216_142217
Signal #309
Residual of Envelope
Spectrum of
accelerometer RR4
(Figure 2)
2
Confirmed detection on at
least two signal channels;
i.e. the fault indicators
remain consistently above
the threshold.
Day024_Hunting_SSA_20211216_144133
Signal #313
Residual of Envelope
Spectrum of
accelerometer RL3
(Figure 3)
