1. Date of download: 10/31/2017
Copyright © ASME. All rights reserved.
From: On the Controllability and Observability of Actively Lubricated Journal Bearings With Pads Featuring Different Nozzle-Pivot Configurations
J. Tribol. 2016;139(3): doi: /
Figure Legend:
Scheme of a simplified ALB consisting of: a passive lubrication system, ⑤ low pressure pump + ③ sprinklers; an active lubrication system, ① high pressure pump + ② servovalve + ④ injection nozzles. Both lube systems are connected to the same ⑥ reservoir.

2. Date of download: 10/31/2017
Copyright © ASME. All rights reserved.
From: On the Controllability and Observability of Actively Lubricated Journal Bearings With Pads Featuring Different Nozzle-Pivot Configurations
J. Tribol. 2016;139(3): doi: /
Figure Legend:
Sketched view of the pad-injector section. ①: pad, ②: pivot, ③: injector, ④: housing body, ⑤: o-ring seal, and ⑥: nozzle conical inlet wall.

3. Date of download: 10/31/2017
Copyright © ASME. All rights reserved.
From: On the Controllability and Observability of Actively Lubricated Journal Bearings With Pads Featuring Different Nozzle-Pivot Configurations
J. Tribol. 2016;139(3): doi: /
Figure Legend:
Different tilting pads with pressurized oil injection nozzle: (a) offset-nozzle pad, Θnozzle<0.5, Θpivot=0.5, (b) centered-nozzle pad, Θnozzle=Θpivot=0.5, (c) offset-pivot pad, Θnozzle=0.5, Θpivot>0.5, and (d) comparison of an offset-nozzle pad with a centered-nozzle pad

4. Date of download: 10/31/2017
Copyright © ASME. All rights reserved.
From: On the Controllability and Observability of Actively Lubricated Journal Bearings With Pads Featuring Different Nozzle-Pivot Configurations
J. Tribol. 2016;139(3): doi: /
Figure Legend:
Three DOFs rigid rotor-single rigid pad system. Pad with rocker-pivot and injection nozzle. ξ: vertical journal movement; θ: pad tilt angle; and η: pad vertical displacement.

5. Date of download: 10/31/2017
Copyright © ASME. All rights reserved.
From: On the Controllability and Observability of Actively Lubricated Journal Bearings With Pads Featuring Different Nozzle-Pivot Configurations
J. Tribol. 2016;139(3): doi: /
Figure Legend:
Sensors placement for DOFs measuring: (a) measuring of journal displacement ξ, (b) measuring of pad tilt angle θ and pad vertical displacement η, and (c) measuring of controllable forcefc

6. Date of download: 10/31/2017
Copyright © ASME. All rights reserved.
From: On the Controllability and Observability of Actively Lubricated Journal Bearings With Pads Featuring Different Nozzle-Pivot Configurations
J. Tribol. 2016;139(3): doi: /
Figure Legend:
Root locus plot for the system under 1400 N

7. Date of download: 10/31/2017
Copyright © ASME. All rights reserved.
From: On the Controllability and Observability of Actively Lubricated Journal Bearings With Pads Featuring Different Nozzle-Pivot Configurations
J. Tribol. 2016;139(3): doi: /
Figure Legend:
ALB test rig with centered-nozzle pad. ①: servovalve, ②: AC motor, ③: electromagnetic shaker, ④: rotor, ⑤: levered arm, ⑥: load cell, and ⑦: displacement sensor (not seen).

8. Date of download: 10/31/2017
Copyright © ASME. All rights reserved.
From: On the Controllability and Observability of Actively Lubricated Journal Bearings With Pads Featuring Different Nozzle-Pivot Configurations
J. Tribol. 2016;139(3): doi: /
Figure Legend:
Comparison of theoretical (Theo) against experimental (Exp) FRFs of the system with pad #C under different loading conditions. Journal displacement as output variable, y1=ξ.

9. Date of download: 10/31/2017
Copyright © ASME. All rights reserved.
From: On the Controllability and Observability of Actively Lubricated Journal Bearings With Pads Featuring Different Nozzle-Pivot Configurations
J. Tribol. 2016;139(3): doi: /
Figure Legend:
Theoretical FRFs for all pads. Bearing applied load of 1400 N. △: pad #N2, □: pad #N1, ◯ : pad #C, ⋄: pad #P1, and ▽: pad #P2. Solid line (–): flexible pivot and dashed line (- -): rigid pivot.

10. Date of download: 10/31/2017
Copyright © ASME. All rights reserved.
From: On the Controllability and Observability of Actively Lubricated Journal Bearings With Pads Featuring Different Nozzle-Pivot Configurations
J. Tribol. 2016;139(3): doi: /
Figure Legend:
Comparison of pressure profiles and their circumferential centroids for the centered-nozzle pad. (a) Hydrodynamic pressure profile, (b) hydrodynamic + constant hydrostatic pressure profile, and (c) variable hydrostatic pressure profile. Injector placed at origin. Circumferential injector limits ± 1.7 deg.

11. Date of download: 10/31/2017
Copyright © ASME. All rights reserved.
From: On the Controllability and Observability of Actively Lubricated Journal Bearings With Pads Featuring Different Nozzle-Pivot Configurations
J. Tribol. 2016;139(3): doi: /
Figure Legend:
Stiffness and damping force coefficients for the ALB with different pads obtained under the studied operational condition. Bearing load of 1400 N; single pad configuration and flexible pivot.

12. Date of download: 10/31/2017
Copyright © ASME. All rights reserved.
From: On the Controllability and Observability of Actively Lubricated Journal Bearings With Pads Featuring Different Nozzle-Pivot Configurations
J. Tribol. 2016;139(3): doi: /
Figure Legend:
Calibration function for the hydraulic system under the studied operational conditions. Controllable force fc as a function of control signal u. ◇: 700 N of bearing load, κH = 95 N/V. ◯: 1400 N of bearing load, κH = 80 N/V. □: 2800 N of bearing load, κH = 70 N/V.

13. Date of download: 10/31/2017
Copyright © ASME. All rights reserved.
From: On the Controllability and Observability of Actively Lubricated Journal Bearings With Pads Featuring Different Nozzle-Pivot Configurations
J. Tribol. 2016;139(3): doi: /
Figure Legend:
Theoretical FRFs. Bearing applied load of 700 N. △: pad #N2, □: pad #N1, ◯: pad #C, ◇: pad #P1, ▽: pad #P2. Solid line (–): flexible pivot and dashed line (- -): rigid pivot.

14. Date of download: 10/31/2017
Copyright © ASME. All rights reserved.
From: On the Controllability and Observability of Actively Lubricated Journal Bearings With Pads Featuring Different Nozzle-Pivot Configurations
J. Tribol. 2016;139(3): doi: /
Figure Legend:
Theoretical FRFs. Bearing applied load of 2800 N. △: pad #N2, □: pad #N1, ◯: pad #C, ◇: pad #P1, ▽: pad #P2. Solid line (–): flexible pivot and dashed line (- -): rigid pivot.