PERIOD: NOVEMBER 1. Introduction to gear failures: how to recognize them, what causes them, how to avoid them. 2. Typologies of failure, AGMA classification: wear, scuffing, Hertzian fatigue (macropitting, micropitting, surface initiated failure, subcase fatigue), plastic deformation, fracture, bending fatigue, cracking. 3. Typologies of failure (pitting, bending) analyzed by Standards (AGMA, ISO,…) that may be taken into account in the design phase. 4. Criteria for prediction of scuffing and micropitting risk, effect of lubrication conditions. 5. Crack paths identification (in the design phase) for light weight gears; effect of centrifugal loads.

1. Introduction to gear monitoring techniques 2. Different technologies and tools available nowadays 3. Measurement chain for vibration signature 4. Fundamental differences between gears and bearings signals 5. Meshing frequencies (regular and satellite gearboxes), bearing signature 6. Literature classical analysis : RMS, Crest, Kurtosis, Peaks, Cepstrum and specific indicators (NA4 and NA4*, M6A, M8A, and FM4…. ) 7. Measurement Chain 8. Computed Order Tracking & Synchronous Average 9. Linear Prediction 10. Discrete Random Separation 10.1. Gears 10.2. Bearings 11. Time Varying Fourier Transform (TVFT) 12. Spectrum evolution in time 13. Transmission Error * 14. Spectral Kurtosis 15. EMD and EEMD 16. Statistical analysis and detection 17. Outlier analysis 18. Principal Components Analysis

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