Tribology Group

Luis San AndresMast-Childs Professor

Turbomachinery Laboratory

Mechanical Engineering DepartmentTexas A&M University

May 2009

29th TRC meeting

http://phn.tamu.edu/TRIBGroup

Tribology Group

Luis San Andres

Mission: To advance state of the art in fluid film bearings for high performance turbomachinery

Types of funded research projects:• Engineering science fundamentals & development of computational engineering tools,

• Experimental – Bearing & Seal parameter identification

• Test-product verification & design validation• Education

Tribology Group: Graduate Students

L-R: Shraddha Sangelkar, Keun Ryu, Zach Ashton, Arian Vistamehr, Thomas Chirathadam, Dr. Tae Ho Kim, Sanjeev Sechagiri, Chunliu Maomissing: Yaying Niu, Dr. Adolfo Delgado, UGs: Laura Wells, Ramon Silva, Anthony Logan, Brian

Buttler

Engineering Fundamentals & Tools

Gas foil bearings for high temperaturesNASA GRC (Sept 07- August 09) $ 284 kLow cost license to TRC members – Summer 2009

2009: Fortran codes & GUIs integrated into XLTRC2 toolFast programs – Physics based & engineering driven

FEPressDam: Hydrodynamic bearings: including pressure dam bearings – THD model

GFBpress: Gas foil bearings with side pressure (cooling)

TiltPadHGB: Gas Hybrid Bearings – Tilting Pad

FE_groove_oil_seal: Oil seal rings and squeeze film dampers with multiple grooves

HYBRID BRUSH SEALS TO IMPROVE GAS TURBINE EFFICIENCYSiemens (06-June 09) $ 182,943

Industry Grants

InsulationShaft

Bearing Assembly

Exhaust duct

Air inlet

Rotor

Test sealPressurization Vessel Centering spring

Cold air inlet

MotorSeal

High temperature seal test rig (300 C=572 F)

HALO™ Seal

Hybrid Brush Seal

Compare leakage: four seal types

Industry Grants - Siemens

HALO™ Seal

Hybrid Brush Seal

0

5

10

15

20

25

30

35

40

1.0 2.0 3.0 4.0 5.0 6.0

Pressure Ratio [Ps/Pe]

Flow

Fac

tor

[kg-

K0.

5/(M

Pa-

m-s

)]

Labyrinth SealBrush SealHybrid Brush SealHALO™ Seal

Flow factor Φ for four seal types versus inlet/exhaust pressure ratio [Ps/Pe] for increasing gas inlet temperatures (300 °C).

Flow factor

DP

Tm

s

SFD EXPERIMENTAL TESTING & ANALYTICAL METHODS DEVELOPMENT

Large load (500 lbf) SFD test rigPratt & Whitney (08/08-12/10) $ 350k

Industry Grants

Static loader

Shaker assembly (Y direction)

Shaker assembly (X direction)

Static loader

Shaker in X direction

Shaker in Y direction

SFD test bearing

$182,562.3 $119,918.5Year 1 Year 22,009 2,010

-$80 k uncertain

08-09 TRC funding

Metal Mesh Foil Gas Bearings for Oil-Free Turbomachinery

TRC (08-09) $ 40 k – funded 09/01/08

Gas Bearings for Oil-Free Turbomachinery

TRC (08-09) $ 40 k – funded 11/01/08

Foil Bearings for Oil-Free Turbomachinery

TRC (08-09) $ 40 k – funded 02/01/09

PLEASE NOTE START DATE FOR FUNDINGProject funding << 12 month : Project reports < 12 month

Honeywell Turbocharging Technologies (2001-Jan 2009) $438 k

Virtual Tool for Turbocharger rotordynamics

Predicted Steady-State Waterfall / Y DisplacementRBS with ODminIDmax / Oil Texaco-Havoline Energy 5W30, 150°C, 4bar

0

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000

Frequency (Hz)

Mo

tio

n A

mp

litu

de

Subsynchronous ComponentsSynchronous Component

Predicted Steady-State Waterfall / Y DisplacementRBS with ODminIDmax / Oil Texaco-Havoline Energy 5W30, 150°C, 4bar

0

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000

Frequency (Hz)

Mo

tio

n A

mp

litu

de

Subsynchronous ComponentsSynchronous Component

Measured Steady-State Waterfall / Y DisplacementRBS with ODminIDmax / Oil Texaco-Havoile Energy 5W30, 150°C, 4bar

0

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000

Frequency (Hz)

No

rma

lize

d N

on

lin

ea

r R

es

po

ns

e

Subsynchronous ComponentsSynchronous Component

Measured Steady-State Waterfall / Y DisplacementRBS with ODminIDmax / Oil Texaco-Havoile Energy 5W30, 150°C, 4bar

0

0.01

0.02

0.03

0.04

0.05

0.06

0.07

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000

Frequency (Hz)

No

rma

lize

d N

on

lin

ea

r R

es

po

ns

e

Subsynchronous ComponentsSynchronous Component

Predicted shaft motion Measured shaft motion

Ended: payments too late(do more with less … to do more with no $$)

http://reumicro.tamu.eduEducationSummer Research Undergraduate Experience in Microturbomachinery & Manufacturing(10 students /year) x 3 y NSF (06-09) $ 259 k

L. San Andres (MEEN) & W. Hung (ENT)

To conduct hands-on training and research in mechanical, manufacturing, industrial, or materials engineering topics related to technological advances in microturbomachinery.

To develop microturbines to enhance defense, homeland security, transportation, and aerospace applications.

13 students in Summer 2009

ASME Paper GT2009-59920 : Education Committee

Statistics 08/09

$ 210k + 120k (TRC)new research

funding

$ 549.9 k research expenditures (FY 08)

Tribology Group Performance

Publications 2008 2009 Total

Journal (peer reviewed) 5 5 10Conference (peer reviewed) 6 7 13Conference (NOT peer

reviewed)2 2 4

Accepted / awaiting publication

5P2A

7

Extended Abstracts

Student posters

24

4 64

Projects on Gas Foil Bearings (NASA GRC, TRC), Hybrid Brush Seals (Siemens), Turbochargers (HTT), SFDs (Pratt & Whitney)

- 80k (PW) - 40k (HTT)

Projects start too late: last one just 4 months b/f TRC

Rotordynamic Force Coefficients of a Hybrid Brush Seal: Measurements and Predictions, GT2009-59072

Turbocharger Nonlinear Response with Engine-Induced Excitations: Predictions and Test Data, GT2009-59108

Thermohydrodynamic Analysis of Bump Type gas Foil Bearings: A Model Anchored to Test Data, GT2009-59919

Dynamic Forced Response of a Rotor-Hybrid Gas Bearing System Due to Intermittent Shocks, GT2009-59199

Measurements of Structural Stiffness and Damping Coefficients in a Metal Mesh Foil Bearing, GT2009-59315

Identification of Squeeze Film Damper Force Coefficients from Multiple-Frequency, Non-Circular Journal Motions, GT2009-59175

Gas Bearing Technology for Oil-Free Microturbomachinery – Research Experience for Undergraduate (REU) Program at Texas A&M University, GT2009-59920

ASME Turbo Expo 2009, June 2009, Orlando, FLA

Tribology Group Students • Prepared for global

competency• Learn communication skills

(written & oral)• Training in teams that work

and deliver• Ready for open-ended

multidisciplinary problems with no unique answer

• Experience in research tied to industrial needs

• Learn of compelling need for professional integrity

Graduated 08PhD Adolfo Delgado(GERC)

PhD Tae Ho Kim (KIST)Graduating June 09 MS Zach Ashton(Rocketdyne),

MS Arian Vistamehr(PhD UT Austin)

MS Yaying Niu(?),

MS Thomas Chirathadam(?)

DO MORE WITH LESS!

2009 TRC Research Progress Reports

Find Summaries in Tribology Group Annual Report (2009)

DYNAMIC RESPONSE OF A ROTOR-AIR BEARING SYSTEM DUE TO BASE INDUCED PERIODIC MOTIONS

Luis San Andrés, Yaying Niu,

TRC-B&C-1-09Measurements of Rotordynamic Performance in a Hot Rotor-

Gas Foil Bearing System Luis San Andrés, Keun Ryu, Tae Ho Kim,

TRC-B&C-2-09Measurement of Bearing Drag Torque, Lift-Off Speed and

Identification of Structural Stiffness and Damping in a Metal Mesh Foil Bearing

Luis San Andrés, Thomas Chirathadam

TRC-B&C-3-09

2009 TRC Research Proposals

Proposals in Tribology Group Annual Report (2009)

Identification of Force Coefficients in an End Sealed SFD with Offset Multiple-Frequency Orbits (new)

Gas Bearings for Oil-Free Turbomachinery (continuation IV)

A pain in the neck!

Wear !

Lubrication path

BEFORE Oct 08After Oct 08

PEEK disks

Bionic 6c man

Schedule of student presentations

8:40 Introduction

8:50 Dynamic Response of a Rotor-Air Bearing System due to Base Induced Periodic Motions

9:15 Measurement of Bearing Drag Torque, Lift-Off Speed and Identification of Structural Stiffness and Damping in a Metal Mesh Foil Bearing

9:45 Measurements of Rotordynamic Performance in a Hot Rotor-Gas Foil Bearing System

10:20 Proposals

Gas Bearings for Oil-Free Turbomachinery

Identification of Force Coefficients in an End Sealed SFD with Offset Multiple-Frequency Orbits

Thanks for your continued support and encouragement!

Off to Singapore