Tribology Group / Rotordynamics Laboratory   (June 28 2018)
Texas A&M University

Contact Information: Lsanandres@tamu.edu

Phone: (979) 862 4744 Fax: (979) 845 6382

The Tribology Group/Rotordynamics Laboratory is one of the most active and well equipped research groups in the Turbomachinery Program at Texas A&M University. The laboratory area totals 1600 square feet in two test cells at the Turbomachinery Laboratory.

In the field of Tribology (friction, lubrication and wear) research focuses on  experimentally verified computational film flow models for the prediction of the static and dynamic force response of fluid film bearings; in particular hydrostatic bearings, tilting pad bearings, annular pressure seals, squeeze film dampers, floating ring bearings, gas damper bearings and seals, foil gas bearings and porous-carbon bearings.

In the Rotordynamics field, research deals with the measurement and prediction of the dynamic lateral vibration characteristics of turbomachinery, encompassing both the traditional aspects of rotordynamics analysis and investigations into the fluid film-structure interaction forces that influence rotordynamics, with a major emphasis in fluid film dampers and gas bearings.

GOALS of our RESEARCH GROUP

*  To deliver an advanced education in the fields of fluid film lubrication and rotordynamics
To provide both graduate and undergraduate students with an in-depth education on the fundamental aspects of fluid film bearing technology and dynamics of high speed rotating machinery. Our research covers a wide spectra of novel bearing and seal applications and rotordynamics addressing to current and future industrial needs

*  To develop advanced analytical and computational tools for the analysis and design of process fluid film bearings and seals
The trends in turbomachinery demand the largest output power to weight ratios and require flexible mechanical rotating components able to operate at increasing shaft speeds, temperatures and pressure differentials. Best efficiency and compactness can only be achieved with the effective use of the process liquid or gas as the lubricant in the support bearings

*  To measure the static and dynamic force performance of fluid film bearings and squeeze film dampers
The test program on squeeze film dampers has an outstanding international reputation. Major advances have resulted from the analysis and experimental verification of the forced performance of squeeze film dampers due to the effects of feeding grooves, fluid inertia and dynamic lubricant cavitation. The latest experimental measurements provide fundamental understanding on the complex flow mechanics of air ingestion and entrapment (bubbly lubricant mixtures) in the dynamic performance of squeeze film dampers and wet seals.

*  To advance technologies for oil-free turbomachinery and micro-turbomachinery
Research focuses on the analysis and experimental verification of the static and dynamic forced performance of gas bearings and seals for applications in micro-turbomachinery (40 kW-500 kW) and portable power hybrid systems (SFOC & gas turbines).

 

2018  Presentations for projects and papers at conferences:

ASME Turbo Expo18 (Norway),
Asia Turbomachinery and Pump Symposium (Singapore),

III Chinese International Turbomachinery Conference (China), XII Gas Lubrication and Dry Gas Seal Conference (China),
II Global Power and Propulsion Society Forum (Zurich)

     2018 TRC Meeting: presentations and proposals to sponsors.

 

Coming soon   Sept 17 2018 Bearings for Oil Free TM (One Day) Short Course at the 47th Turbomachinery Symposium ((Houston) – With Dan Lubell

 

For presentations in past years move to near end.

 

 

Projects  2015-18

 

·         Squeeze Film Dampers – Identification of dynamic forced performance & operating with air ingestion

Objective: To assess novel SFD designs for aircraft applications.

Status: Test rig operational (500 lbf dynamic force). Measurements and force coefficients identification completed in a 5” OD open ends SFDs with central groove. Effect of fluid inertia dominates SFD forced response.

Sponsor: Pratt & Whitney Engines, January 1, 2012-October 31, 2018 (7 years). 

            Turbomachinery Research Consortium, 2012-2017 (5 year).              

 

·         Computational Model for Tilting Pad Journal Bearings (Radial & Thrust)

Objective: Develop code for prediction of tilting pad bearings forced response accounting for thermal effects and including pad surface and pivot radial and transverse flexibility.

Status: Completed. TPJB© code shows +good correlation with test data for bearings with very flexible pivots.

Sponsor: Turbomachinery Research Consortium, 2010-2019 (7 years). 

 

·         Computational Model for Floating Ring Bearings in Turbochargers (TCs)

Objective: Develop codes for complete rotor-bearing system and application to TC nonlinear dynamics

Status: Code in progress

Sponsor: KeyYang Precision (South Korea), 2017-2019 (2 year) $XX

 

·         Test Program on Static and Dynamic Forced Response of Tilting Pad Journal Bearings

Objective: Measure applied load, flow, torque, pad temperatures, and rotordynamic force coefficients in a number of (sponsor) tilting pad journal bearings

Status: Near completion – 10 bearing configurations completed

Sponsor: Elliott Co., 2017-2019 (2 year) $XX

 

·         Test Program on Interlocking Labyrinth Seals (ILS) for Steam Turbines

Objective: Measure flow rate, inlet swirl and cavity pressures in ILS as function of clearance, supply inlet and outlet pressures, and rotor speed. Dynamic motions exerted by a magnetic bearing system.

Status: In progress – major issues on test rig construction and operation.

Sponsor: Mitsubishi Heave Industries (Japan). 2017-2018, (1 year) $XX

 

·         Wet Seals for Sub-Sea multiple phase compressors

Objective: Build gas in oil mixtures and measure leakage and force coefficients in various seals.

Status: Test rig operational (100 lbf dynamic force). Measurements and leakage in progress

Sponsor: Turbomachinery Research Consortium, 2013-2018 (5 years).              

 

·         Hybrid CFD-Bulk Flow Models for Pump Seals and Gas Labyrinth Seals

Objective: Build accurate (and fast) bulk-flow models for grooved pump seals based on CFD predictions

Status: Axisymmetric flow calculations, extraction of friction factors and prediction of dynamic force coefficients routinely performed.

Sponsor: Torishima Pumps, 2014-2016 (2 years), Turbomachinery Research Consortium, 2015-2018 (3 years).           

 

·         CFD models for Gas Labyrinth Seals, Pump Seals, and Two-Phase Pocket Damper Seals

Objective: Produce CFD analysis of high fidelity to replicate experimental results and advance knowledge on multiple-phase seals

Status:  Progress to realize efficient CFD techniques for ready industrial use.

Sponsor: Turbomachinery Laboratory, 2017-2018 (2 years), Turbomachinery Research Consortium, 2017-2018 (1 year).           

 

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Dr. Luis San Andrés, Mast-Childs CHAIR Professor (2014-2019) & Group Leader
ASME Fellow, STLE Fellow

Dr. San Andrés is a qualified analyst and experimentalist in the fields of fluid film lubrication and rotordynamics. Dr. San Andrés has managed research projects with a total value near 11 million USD. He directs a laboratory with an average of seven fully supported research assistants per year. Dr. San Andrés has educated many graduate students currently practicing their skills and providing services and leadership to turbomachinery manufacturers. Dr. San Andrés and his students have published extensively in the archival literature: 160 peer reviewed journal papers, +90 reviewed and 41 invited conference papers, 100+ technical reports. Dr. San Andrés also holds five patents and the copyright for various computational programs predicting the performance of liquid and gas hydrostatic and hydrodynamic bearings, seals and foil gas bearings.

Dr. San Andrés has provided major advances to the technology of hybrid bearings (hydrostatic / hydrodynamic) for applications in primary power space turbopumps. The bearings investigated, both theoretically and experimentally, include flexure-pivot tilting pad bearings, angled injection hybrid bearings and foil-bearings. Current research interests include analysis of hybrid thrust bearings and two-phase fluid seals for submersible (subsea) TM, and high speed gas face seals and bearings with enhanced damping characteristics.

The Tribology Group has developed advanced and efficient computational models for the analysis and design of process-fluid film bearings (hydrostatic and hydrodynamic), gas bearings including foil bearings, gas damper and labyrinth seals, tilting pad bearings and squeeze film dampers. The thermo hydrodynamic flow models account for fluid inertia and variable properties, flow turbulence in exotic bearing geometries. Applications to high-speed turbomachinery include cryogenic turbopumps, aircraft jet engines, industrial compressors, etc. Users include Boeing-Rocketdyne, Pratt & Whitney, NASA Research Centers and Contractors, Philips Laboratory - USAF, TAMU Turbomachinery Research Consortium members, Sulzer-Bingham, GE Aircraft Engines Group, SNECMA-SEP-France, Hamilton Std., Siemens, Capstone Micro Turbines, and educational institutions.

Favorite Links

*  Turbomachinery Laboratory     

*  Turbomachinery Research Consortium

*  XLrotor    a commercial rotordynamics/bearing analysis package

*  rotordynamics.org, a gateway to a collection of technical literature on rotordynamics.

 

Personal Interests

*  Roca Azul, the premier Latin Rock & Blues Band in the Brazos Valley

*  My music – the one solo band El Santo

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Scholarly impact: June 2018

 

Scholar Google  June 28 2018

 

All

Since 2013

Citations

5518

2398

h-index

40

25

i10-index

142

85

 

 

Scopus (249 documents)

 

 

Since 2000

Citations

 

2808

Not-self

 

2260

h-index

 

28

 

 

Web of Science (179 articles)

 

 

Since 1981

Citations

 

812

Not self-citations

 

495

Average cit / item

 

4.54

h-index

 

15

https://scholar.google.com/citations?user=W1S_CWwAAAAJ&hl=en&oi=ao

 

 

2008

2009

2010

2011

2012

2013

2014

2015

2016

2017

2018

2014-18

Career

Publications

Journal (peer reviewed)

5

6

11

6

6

5

1

6

6

2

4

19

163

Journal (peer reviewed)

Conference (peer reviewed)

6

7

7

5

6

5

7

5

7

6

10

35

105

Conference (peer reviewed)

Conference (NOT peer reviewed)

2

2

2

 

 

2

 

3

 

 

3

6

42

Conference (NOT peer reviewed)

Accepted/awaiting publication

 

 

 

 

 

 

 

 

 

2

11

13

 

Accepted/awaiting publication

 

 

 

 

 

 

 

 

 

 

 

 

73

310

 

 

 

Research Awards and expenditures (1990-2018)



External research

$6’663,184

Internal TRC & TL

$3’047,659

Gifts

 

$64,000

Software Licensing

$365,113

Equipment

713,775

Student/Post-doc support

$172,700

total

 

10’996,431

 

 

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Distinctions – Former Students and Awards

Name

Society

Distinction

Contribution

 

 

Tae-Ho Kim

ASME Tribology Division

2013 Burt Newkirk Investigator Award 

Foil Gas Bearings

Deborah Osborne- Wilde

ASME Tribology Division

2004 Marshal Peterson Young Investigator Award

Gas Bearings and Seals

Sergio Diaz

ASME Tribology Division

2003 Burt Newkirk Investigator Award 

Squeeze Film Dampers

Nicole Zirkelback

Texas A&M University

1998 Outstanding Graduate Student Award

Gas Annular and Face Seals

  Several graduate and undergraduate students have earned STLE scholarships and fellowships, travel awards to the ASME Turbo-Expo Conference, and TAMU travel wards to conferences.

 

2018 Best Paper Award, Structures & Dynamics Committee, ASME IGTI (June 2018)

San Andrés, L., and Lu, X., 2017, “Leakage. Drag Power and Rotordynamics Force Coefficients of an Air in Oil (Wet) Annular Seal, ASME GT2017-63254

 

2017 Best Paper Award, Structures & Dynamics Committee, ASME IGTI (June 2017)

San Andrés, L., Childs, D., and Phillips, S., 2016, “A Water Lubricated Hybrid Thrust Bearing: Measurements and Predictions of Static Load Performance,” ASME GT2016-56349

 

2014 Outstanding Paper 9th IFToMM International Conference on Rotordynamics, Milan, Italy (1/198 papers)

    San Andrés, L., Jeung, S.-H, and Bradley, G., 2014, “Dynamic Forced Performance of Short Length Open-Ends Squeeze Film Damper with End Grooves.”

 

2012 Best Paper Award, Microturbines, Turbochargers, & Small Turbomachines Committee, ASME IGTI (June 2013)
San Andrés, L.., Barbarie, V., Bhattacharya, A., and Gjika, K., 2012, “On the Effect of Thermal Energy Transport to the Performance of (Semi) Floating Ring Bearing Systems for Automotive Turbochargers,” ASME J. Eng. Gas Turbines Power, vol. 134 (October), 102507 [ASME paper GT2012-68074]

 

2012 Best Paper Award, Structures & Dynamics Committee, ASME IGTI (June 2013)

Ryu, K., and San Andrés, L., 2012, ”Effect of Cooling Flow on The Operation of a Hot Rotor-Gas Foil Bearing System,” ASME J. Eng. Gas Turbines Power, vol. 134 (October), 102511 [ASME paper GT2012-68074]

 

2011 BEST Rotordynamics Paper Award 2012 IGTI  Structures and Dynamics Committee

San Andrés, L., and Delgado, A., “A Novel Bulk-Flow Model for Improved Predictions of Force Coefficients in Grooved Oil Seals Operating Eccentrically,” ASME J. Eng. Gas Turbines Power, vol. 134 (May), 022509 [ASME Paper GT2011-45274].

 

2010 Best Paper Award for ASME Journal of Tribology (2011 IJTC Conference, LA)

Kim, T. H., and San Andrés, L., 2010,Thermohydrodynamic Model Predictions and Performance Measurements of Bump-Type Foil Bearing for Oil-Free Turboshaft Engines in Rotorcraft Propulsion Systems,” ASME Journal of Tribology, Vol. 132(January), p. 011701

 

2008 BEST Rotordynamics Paper Award – IGTI  Structures and Dynamics Committee

Kim, T. H., and San Andrés, L., 2009, “Effect of Side End Pressurization on the Dynamic Performance of Gas Foil Bearings – A Model Anchored to Test Data,” ASME Journal of Engineering for Gas Turbines and Power, 131(1), pp. 012501. ( ASME Paper GT2008-50571)
 

Editor’s Choice – Tribology & Lubrication Technology, June 2007, pp. 40-50.
De Santiago, O., and L., San Andrés, 2007, “Experimental Identification of Bearing Dynamic Force Coefficients in a Flexible Rotor – Further Developments,” Tribology Transactions, v. 50(1), p. 114-126.


2005 BEST Rotordynamics Paper Award
– IGTI  Structures and Dynamics Committee

Rubio, D., and L. San Andrés, 2007, “Structural Stiffness, Dry-Friction Coefficient and Equivalent Viscous Damping in a Bump-Type Foil Gas Bearing,” ASME Journal of Engineering for Gas Turbines and Power, 129, pp. 494-502. (ASME Paper GT 2005-68384)


2003 Best Rotordynamics Paper Award
(IGTI, Structures & Dynamics Committee

Wilde, D.A., and San Andrés, L., 2006, “Experimental Response of Simple Gas Hybrid Bearings for Oil-Free Turbomachinery,” ASME Journal of Engineering for Gas Turbines and Power, 128, pp. 626-633. (ASME Paper No. GT 2003-38833)

 

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PAST PROJECTS & PAPERS PRESENTATIONS

 

2017

     Turbo Expo17 and others

     2017 TRC Meeting: presentations and proposals to sponsors.
   

2016

     TurboExpo16:  presentations on SFDs, thrust collars, gas bearings and hydrostatic thrust bearings

     2016 TRC Meeting: presentations and proposals to sponsors.
     2016 Asia T&P Symposium: lecture on SFDs

  One-Day Short Course at 45th Turbomachinery Symposium (Houston)

       Sept 12 2016

Gas Bearings and Magnetic Bearings for Oil Free Rotating Machinery

An introduction to the operation, design and performance of gas bearings/mag bearings and their practical integration into oil-free turbomachinery. Instructors: Dan Lubell and Luis San Andrés  

 

2015 TurboExpo15:  Tilting Pad Bearings – Pad Flexibility, Open End SFD, Shimmed Foil Bearing, Gas Bearing & Rotordynamics, Linearized Force Coefficients: a Novel Approach.  

             2015 TRC Meeting: presentations and proposals to sponsors.

  STLE Annual Meeting:  SFD – impact load, Porous Gas Bearing, Bubbly Wet Seals.

 

2014 TurboExpo14:  Thrust Foil Bearing, Tilting Pad Bearings, SFD, Thrust Collar, Gas HALO seal.

2014 TRC Meeting: presentations and proposals to sponsors.
           
Machinery Vibrations and Rotordynamics Short Course, January 13-17 2014

2013 TurboExpo13:  Foil Bearings, Metal Mesh Bearings, Tilting Pad Bearings, SFDs.
           
STLE Annual Meeting: Laby vs HALO seal, open ends SFD.

            2013 TRC Meeting: presentations and proposals to sponsors.

 

SHORT COURSE Gas Foil Bearings for Rotating Machinery
Date: April 16-17, 2013, Tuition: $1,350.00, CEU Credits: 16. Location: Houston, TX

2012 TurboExpo12:  Foil Bearings, Metal Mesh Bearings, SFDs, Turbochargers and more.

            2012 TRC Meeting: presentations and proposals to sponsors.

 

2011 TurboExpo11:  Foil Bearings, SFDs, and more. Turbochargers, Congreso Latinoamericano de Turbomaquinaria.
           
2011 TRC Meeting: presentations and proposals to sponsors.

 

2010 Turbo Expo10:  Hot Foil Bearings, Metal Mesh Bearings, IFToMM:  Turbochargers, foil bearings
               No TRC projects were funded in 2010 (Dr. San Andres on Faculty Development Leave)

 

 

Slide shows of technical presentations

2011, January

Research Progress Overview on Turbocharger NL Bearings and Rotordynamics  

2011, June

Research Progress Overview on Gas Foil Bearings  

2014, December

Research Progress Overview on Non-Contacting Gas Seals (HALO)

 

 

2009 Turbo Expo 09:  Foil Bearings, Metal Mesh Bearings, SFDs

  2009 Metal mesh foil bearings at EPN (July 2009) Quito-Ecuador

 

2009 TRC

TRC funded projects (May 09)     

TRC-B&C-1-09

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

TRC-B&C-2-09

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

TRC-B&C-3-09

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

 

 2008 ISCORMA -2008 Plenary Lecture on Gas Bearings, Hawaii

 

2008 TRC

TRC funded projects (May 08)     

TRC-SFD-1-08

Dynamic Performance of a Squeeze Film Damper with Non-Circular Motions: Multi-Frequency Excitations Reproducing Multi-Spool Engine Operating Conditions

TRC-Seal-1-08

A Novel FE Lubrication Model for Improved Predictions of Force Coefficients in Off-Centered Grooved Oil Seals

TRC-B&C-1-08

Dynamic Forced Response of a Rotor-Hybrid Gas Bearing System due to Intermittent Shocks

TRC-B&C-2-08

TRC-B&C-3-08

Thermohydrodynamic Analysis of Bump Type Gas Foil Bearings: Model and Predictions & Rotordynamic Measurements on a High Temperature Rotor Supported on Gas Foil Bearings

TRC-B&C-5-08

Development of a Test Rig for Metal Mesh Foil Gas Bearing and Measurements of Structural Stiffness and Damping in a Metal Mesh Bearing

TRC-B&C-4-08

The Effect of (Nonlinear) Pivot Stiffness on Tilting Pad Bearing Dynamic Force Coefficients

TRC presentation

Simplified Thermohydrodynamic Analysis of (rigid geometry) Journal Bearings

 

Annual Progress Reports (May)

Download short (pdf) reports describing major achievements, publications and funding

 2013 2012 2011 2010  2009  2008 2007 2006   2005  2004   2003   2002   

Dr. San Andres stopped producing these reports in 2014. Young students abhor reading.

 

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PAST COMPLETED PROJECTS

 

·         Porous-Carbon gas bearings (PCGB) for high speed turbomachinery

Objective: test commercial porous carbon bushings and seals to determine rotordynamic performance

Status: Completed tests to estimate pads permeability and imbalance response in a dedicated test rig

Sponsor: Turbomachinery Research Consortium & New-Way Bearings, 2016-17(2 years).

 

·         Metal mesh foil bearings (MMFB) for high speed turbomachinery

Objective: Continue to advance gas bearing technology for high temperature, high speed microturbomachinery applications (power < 400 kW).

Status: Completed tests to verify performance of MMFB at high temperature (200 C) & rotor speed (50 krpm)

Sponsor: Turbomachinery Research Consortium, 2011-12, 2015-17 (3 year).

 

·         Computational Model for Gas Seal Cartridges

Objective: Develop integral code for labyrinth seals and gas face seals

Status: Code in progress

Sponsor: Hyundai RC, 2014-2015 (1 year) $40,000

 

·         SSV-Free Tilting Pad Bearings s

Objective: Model Tilting Pad Bearing Dynamics and Prediction of pad natural frequencies and onset of sub-synchronous vibrations.

Status: Predictive tool under development and validation to published test data.

Sponsor : Hitachi RC,  2013-2015 (3 years) – Proprietary   $152,541

 

·         Computational Model for Lubricated Thrust Collars

Objective: Develop code for leakage and forced response of lubricated thrust collars for integrally geared compressors.

Status: Completed    

Sponsor : Samsung Techwin, 2012-2014 ( 2 year), $158,639

 

·         Thermal Energy Transport Analysis for (Semi) Floating Ring Bearings in Turbochargers

Objective: Integrate thermal energy transport for prediction of forced response in turbocharger bearings

Status: Completed code for semi-floating ring bearings. Validations with test data awaiting.

Sponsor : Honeywell Turbocharging technologies, $208,340 2010-2013 (2 year).

 

·         Measurement of leakage in a novel all-metal non-contacting annular seal at high temperature

Objective: revamp high temperature gas seal test rig for high speed operation and to measure leakage for a labyrinth seal and a HALOTM seal

Status: Completed leakage measurements w/o rotor spinning. Revamping of rig for high speeds in the works.

Sponsor : Turbomachinery Research Consortium, $74,863 Project started September 1, 2010 (2 years).

 

·         Automated Analysis of XLTRC2 Time Transient Responses in Nonlinear Rotor Bearing Systems

Objective: Modeling of NL rotor-bearing systems and GUIs for data handling of XLTRC2 nonlinear transient rotor response output data. 

Status: GUIs developed for automated analyses with minimum User interaction. Applications sought

Sponsor: Turbomachinery Research Consortium, $34,863 Project start May 1, 2011 (2 year). 

 

·         Computational Model for Textured Surface Gas Face Seals

Objective: Develop code for leakage and forced response in textured gas face seals for steam turbines.

Status: Code SpiralG extended to model T groove textured surfaces and GUI completed. Start Sept 1, 2011   

Sponsor : Ciateq A.C. (Mx).

 

·         Gas Bearings for Oil-Free Turbomachinery                  TRC-B&C-1-09

Objective: To advance the technology of inexpensive reliable gas bearings for micro gas turbines and micro power systems

Status: Demonstrated reliability of hybrid gas bearings to intermittent shocks and shaker induced excitations  into base of test rotor-bearing system.

Sponsors: TRC (Turbomachinery Research Consortium)

 

Metal Mesh Foil Bearings for Microturbomachinery      TRC-B&C-3-09, TRC-B&C-1-10

Objective: Further development of predictive models anchored to test data for prediction of mechanical parameters of metal mesh foil bearings.

Status: high speed ( 60 krpm) test rig completed. Measurements of bearing lift off and drag torque during start up and shut down obtained. In 2010, measurements of metal mesh bearing force coefficients completed. 

Sponsor: TRC (2007-2009), test rig donated by Honeywell Turbocharging Technologies

 

·         Foil Gas Bearings for Oil-Free Turbomachinery           TRC-B&C-2-09

Objective: To quantify the structural and dynamic forced performance of bump type foil gas bearings for high temperature micro turbine applications

Status: Computational analysis complete to model thermal management of foil bearings.  High temperature test rig (max 400 C) in operation: MiTi Korolon® bearings and Foster-Miller bearings. Cooperation with KIST Korean Institute of Science and Technology).

Sponsors: NSF (2004-2006), NaSA GRC (2007-2009), TRC (2004-2008)
 

·         Hybrid Brush Seals to Improve Gas Turbine Efficiency

Objective: Measurements of leakage, power loss and structural parameters in labyrinth seal, brush seal and hybrid brush seals for gas turbine applications 

Status: High temperature (300 C) test rig operational. Comparisons of leakage measurements in labyrinth seal, brush seal, hybrid brush seal completed. Tests with novel HALO® seal in progress.  Hybrid brush seals have 1/15 less leakage than labyrinth seal and 1/3 less than conventional brush seal.  

Sponsor: Siemens Power Generation (2006-2009), Seals from Advanced Turbomachinery Group (ATG)

 

·         Dynamic Force Performance of Squeeze Film Dampers

Objective: To assess effect of mechanical end seal on dynamic forced performance of a test SFD.

Status: Test rig accommodates a SFD with a (non rotating) mechanical seal that adds dry friction to system while containing lubricant for extended periods of time and without side leakage. Seal design most successful to avoid air ingestion and entrapment. Structural, dry-friction parameter of mechanical seal and squeeze film damper damping and inertia coefficients identified from single frequency load tests forcing unidirectional and circular centered orbits. Predicted SFD force coefficients agree well with measured ones.

Sponsor: TRC 2004-2009

 

·         Nonlinear Rotordynamics of Automotive Turbochargers: Computational Analysis of Floating Ring Journal Bearings (FRBs) and Experimental Validation in a Turbocharger Test Rig

Objective: To advance (experimentally validated) computational tools for prediction of the dynamic forced response of turbocharger rotors supported on FRBs.

Status: Virtual Laboratory (computational software) is a production tool at Honeywell. Research continues to model compressor and turbine aerodynamic forces and more complex bearing geometries. Advice on foundation model to Jiatong University (China).

Sponsor: Honeywell Turbo Technologies 2001-2008

 

·         CLIN 004 - Tool/Method Development of the AFRL Upper Stage Technology Program (USET) Turbopump USET Development

Objective: Experimental validation and enhancements of computational models for prediction of dynamic forced performance of cryogenic liquid hydrostatic bearings - USAF Upper Stage Engine Technology Program. 

(a): To develop hydrostatic bearing tool with capability for modeling the non-linear forced response of fluid film bearing, i.e. bearing reaction forces (impedance models) as a function of instantaneous journal position, velocity and acceleration

(b): Create capability for modeling speed dependent non-linear operation in mixed flow regime (fluid and solid contact), including prediction of lift-off speed

(c): Experimental Study of Hydrostatic / Hydrodynamic Thrust Bearings: 25 krpm, 250 psi, 600 lbf, water bearings.

Sponsor: Northrop Grumman  2005-2008

 

 Personal interest:

·         On Site Identification of Bearing Parameters in Flexible Rotor Systems

To develop procedures for practical on site reliable bearing parameter identification techniques

SPONSOR: none

 

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PAST PROJECTS OF EDUCATIONAL INTEREST

 

·         Research Experiences for Undergraduates: Development of Microturbomachinery
http://reumicro.tamu.edu

Sponsor: National Science Foundation (4 years) 2006-2010, REU#0552885

P.I: Dr. Wayne Hung (ENTC), co-pi: Dr. Luis San Andrés

Objective: The REU Summer Program funds  30 junior-level students to conduct hand-on training and research in mechanical, manufacturing, industrial, or materials engineering topics related to technological advances in microturbomachinery. This program is part of a larger scale multidisciplinary research project at TAMU to develop microturbines to enhance defense, homeland security, transportation, and aerospace applications. Activities include a series of informative seminars, field trips and social events to complement the research activities while enhancing the group cohesiveness. Students will also sharpen their communication skills through the writing of a research report and presenting their research work to industry (TRC).

 

Excellent facilities and services, small size research teams, exciting interdisciplinary topics, and staying in the intellectual city of College Station provide students an invaluable research experience when participate in this cutting edge technology development.

Ten and seven qualified UGS participated in Summer 2007 & 2008, respectively. A total of seven students worked with Tribology Group students. Read conference paper ASME  GT2009-59920. Thirteen students initiated research in June 2009. 
    

Download posters prepared by UG-REU students, Summer 2009

(Jose Camero, Shane Muller)

Download posters prepared by UG-REU students, Summer 2008

Rotordynamics Foil Bearings TESTS (Alex Martinez)

Rotordynamics Foil Bearings ANALYSIS (Kat Hagen)

Metal Mesh Foil Bearings (Brian Rice) 

Foil Bearings Manufacturing (Nick Niedbalski)

Download posters prepared by UG-REU students, Summer 2007

Gas Foil Bearings (Alex Martinez)

Turbochargers (Adam Wilson)

Gas Tilting Pad Bearings (H. Suh)

 

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Last revision (partial update): June 28, 2018