1. Date of download: 7/3/2016 Copyright © ASME. All rights reserved. From: An Intelligent Prognostic System for Gear Performance Degradation Assessment and Remaining Useful Life Estimation J. Vib. Acoust. 2015;137(2):021004-021004-12. doi:10.1115/1.4028833 Frequency spectra: (a) of the complex Morlet wavelets with different bandwidths and (b) of the developed high-order complex Morlet wavelets with different orders Figure Legend:

2. Date of download: 7/3/2016 Copyright © ASME. All rights reserved. From: An Intelligent Prognostic System for Gear Performance Degradation Assessment and Remaining Useful Life Estimation J. Vib. Acoust. 2015;137(2):021004-021004-12. doi:10.1115/1.4028833 Temporal signals: (a) a raw normal gearbox vibration signal and (b) a normal gear residual error signal Figure Legend:

3. Date of download: 7/3/2016 Copyright © ASME. All rights reserved. From: An Intelligent Prognostic System for Gear Performance Degradation Assessment and Remaining Useful Life Estimation J. Vib. Acoust. 2015;137(2):021004-021004-12. doi:10.1115/1.4028833 Temporal signals: (a) a raw gearbox vibration signal subjected to gear faults and (b) a gear residual error signal subjected to gear faults Figure Legend:

4. Date of download: 7/3/2016 Copyright © ASME. All rights reserved. From: An Intelligent Prognostic System for Gear Performance Degradation Assessment and Remaining Useful Life Estimation J. Vib. Acoust. 2015;137(2):021004-021004-12. doi:10.1115/1.4028833 The proposed intelligent prognostic system for gear performance degradation assessment and RUL estimation Figure Legend:

5. Date of download: 7/3/2016 Copyright © ASME. All rights reserved. From: An Intelligent Prognostic System for Gear Performance Degradation Assessment and Remaining Useful Life Estimation J. Vib. Acoust. 2015;137(2):021004-021004-12. doi:10.1115/1.4028833 The test rig used for collecting accelerated gear degradation signals [5] Figure Legend:

6. Date of download: 7/3/2016 Copyright © ASME. All rights reserved. From: An Intelligent Prognostic System for Gear Performance Degradation Assessment and Remaining Useful Life Estimation J. Vib. Acoust. 2015;137(2):021004-021004-12. doi:10.1115/1.4028833 Gear health condition monitoring by using: (a) the kurtosis of the raw gear signals and (b) the RMS of the raw gear signals Figure Legend:

7. Date of download: 7/3/2016 Copyright © ASME. All rights reserved. From: An Intelligent Prognostic System for Gear Performance Degradation Assessment and Remaining Useful Life Estimation J. Vib. Acoust. 2015;137(2):021004-021004-12. doi:10.1115/1.4028833 Gear health condition monitoring by using: (a) the kurtosis of the gear residual error signals obtained by the proposed method and (b) the RMS of the gear residual error signals obtained by the proposed method Figure Legend:

8. Date of download: 7/3/2016 Copyright © ASME. All rights reserved. From: An Intelligent Prognostic System for Gear Performance Degradation Assessment and Remaining Useful Life Estimation J. Vib. Acoust. 2015;137(2):021004-021004-12. doi:10.1115/1.4028833 Early gear fault detection and performance degradation assessment by using (a) HI1 and (b) HI2 Figure Legend:

9. Date of download: 7/3/2016 Copyright © ASME. All rights reserved. From: An Intelligent Prognostic System for Gear Performance Degradation Assessment and Remaining Useful Life Estimation J. Vib. Acoust. 2015;137(2):021004-021004-12. doi:10.1115/1.4028833 The gear residual error signals obtained by the developed high-order comblet: (a) at file number 34, (b) at file number 35, (c) file number 36, and (d) at file number 37 Figure Legend:

10. Date of download: 7/3/2016 Copyright © ASME. All rights reserved. From: An Intelligent Prognostic System for Gear Performance Degradation Assessment and Remaining Useful Life Estimation J. Vib. Acoust. 2015;137(2):021004-021004-12. doi:10.1115/1.4028833 The gear residual error signals obtained by the developed high-order comblet: (a) at file number 38, (b) at file number 39, (c) file number 40, and (d) at file number 41 Figure Legend:

11. Date of download: 7/3/2016 Copyright © ASME. All rights reserved. From: An Intelligent Prognostic System for Gear Performance Degradation Assessment and Remaining Useful Life Estimation J. Vib. Acoust. 2015;137(2):021004-021004-12. doi:10.1115/1.4028833 Predicted results obtained by using the developed method at file number 80 for gear prognosis Figure Legend:

12. Date of download: 7/3/2016 Copyright © ASME. All rights reserved. From: An Intelligent Prognostic System for Gear Performance Degradation Assessment and Remaining Useful Life Estimation J. Vib. Acoust. 2015;137(2):021004-021004-12. doi:10.1115/1.4028833 Predicted results obtained by using the developed method at file number 110 for gear prognosis Figure Legend: