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control algorithms

  N. Propes, "Hybrid System Diagnosis and Control Reconfiguration for Manufacturing Systems," Ph.D. Thesis, Georgia Tech, April, 2004.
   
  F. Rufus, G. Vachtsevanos and B. Heck, “Real-time Adaptation of Mode Transition Controllers,” Journal of Guidance, Control and Dynamics, Vol. 25, No. 1, pp. 167-175, 2002.
 
  F. Rufus and G. Vachtsevanos, “Design of Mode-to-Mode Fuzzy Controllers,” International Journal of Intelligent Systems, Vol. 15, No. 7, pp. 657-685, 2000.
 
  F. Rufus, G. Vachtsevanos and B. Heck, “Adaptive Mode Transition Control of Nonlinear Systems Using Fuzzy Neural Networks,” 8th IEEE Mediterranean Conference on Control & Automation, University of Patras, Rio, Greece, July 17-19, 2000.
 
 
  F. Rufus, B. Heck and G. Vachtsevanos, “Software-Enabled Adaptive Mode Transition Control for Autonomous Unmanned Vehicles,” 19th Digital Avionics Systems Conference, pp. 1.E.1-1 - 1.E.1-8, 2000.
 
  F. Rufus and G. Vachtsevanos, “Robust Stability of Mode-to-Mode Fuzzy Controllers,” Journal of Guidance, Control and Dynamics, Vol. 22, No. 6, pp. 823-832, 1999.
 
  F. Rufus, S. Clements, S. Sander, B. Heck, L. Wills and G. Vachtsevanos, “Software-Enabled Control Technologies For Autonomous Aerial Vehicles,” 18th Digital Avionics Systems Conference, Vol. 2, pp. 6.A.5-1 - 6.A.5-8, 1999.
 
  Kasliwal, P., and Nataraj C., 2005. “Linear time varying control of Unmanned Surface Vehicles”. Sixth Intelligent Ship Symposium, Villanova, PA.
   
 
   

ENERGY HARVESTING

Modeling and Analysis of a Bimorph PZT Cantilever Beam Based Micropower Generator, Ajitsaria, J., Choe, S-Y., Ozmun, P., Shen, D., Kim, D-J., Sensors and Transducers, Vol. 105, Issue 6, pp.81-93, June 2009.
 
PZT-based MEMS Devices for Vibration Energy Harvesting, D.-J. Kim, J.-H. Park, D. Shen, J. Ajitsaria, and S.-Y. Choe, Proceedings of the 17th International Symposium on the Applications of Ferroelectrics and 2008 Meeting of the Electronics Division of the American Ceramic Society,  EH004, 2008.
 
The Design, Fabrication and Evaluation of a MEMS PZT Cantilever with an Integrated Si Proof Mass for Vibration Energy Harvesting, Shen, D., Park, J-H., Ajitsaria, J., Choe, S-Y., Wikle, H. C., Kim, D-J., J. Micromech. Microeng. 18 No 5, May 2008.
 
Modeling and Analysis of a Bimorph Piezoelectric Cantilever Beam for Voltage Generation, Ajitsaria, J., Choe, S-Y., Shen, D., Kim, D-J., Smart Mater. Struct. 16, 447–454, 2007.
 
Modeling Piezoelectric Cantilever Beam for Voltage Generation, Ajitsaria, J., Choe, S-Y., Shen, D., Kim, D-J., Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, Proc. of SPIE Vol. 6529, 2007.
 
Evaluation and Modeling of Power Generator with Bimorph PZT Cantilever, D. Shen, J. Ajitsaria, S.-Y. Choe, and D.-J. Kim, Proceeding of Materials Research Society Symposium, Vol. 966, 0966-T07-29, 2007.
 
The Optimal Design and Analysis of Piezoelectric Cantilever Beams for Power Generation Devices, Shen, D., Ajitsaria, J., Choe, S-Y., Kim, D-J., Materials Research Society Symposium, Proc. Vol. 888, 2006.
 
Comparative Study of Piezoelectric Materials for Power Scavenger, Shen, D., Ajitsaria, J., Lee, J-G., Choe, S-Y., Kim, D-J., Materials Science and Technology (MS&T), 2006.

prognostic HEALTH MANAGEMENT (PHM)

Battery PHM

    Intelligent Neural Network Implementation for SOCI Development of Li/CFx Batteries, Linda, O.,   William, E.J.,   Huff, M.,   Manic, M.,   Gupta, V.,   Nance, J.,   Hess, H.,   Rufus, F.,   Thakker, A.,   Govar, J., 2nd International Symposium on Resilient Control Systems, ISRCS '09, August 2009.
 
  • A Comparative Study of Lithium Poly-Carbon Monoflouride (Li/CFx) and Lithium Iron Phosphate (LiFePO4) Battery Chemistries for State of Charge Indicator Design, William, E.J.,   Gupta, V.,   Huff, M.,   Linda, O.,   Nance, J.,   Hess, H.,   Manic, M.,   Rufus, F.,   Thakker, A.,   Govar, J., IEEE International Symposium on Industrial Electronics, ISIE 2009, 2009.
 
    Health Monitoring Algorithms for Space Application Batteries, Rufus, F., Lee, S., Thakker, A., IEEE International Conference on Prognostics and Health Management 2008, Denver, CO, October 2008.

 

VEHICLE SYSTEMS PHM

A Hierarchical Fault Tolerant Control System for UGVs Experiencing Mobility Failures, P. Frederick, S. Lee, J. Ajitsaria, and N. Propes, IASTED Robotics and Applications Conference, Cambridge, MA, 2010.
 
    A Health Monitoring Methodology for On- and Off-board Vehicle Systems using Data-driven and Model-based Techniques, D. Finigan, F. DiRosa, N.Propes, F. Heimes, and C. Thompson, NDIA-GVSETS, Detroit, MI, 2009.
 
    A Health Management Solution for Hybrid Electric Vehicle Transit Fleets, R. A. Hess, F. O. Heimes, and N. Propes, 2008 PHM Conference, Denver, CO, 2008.

 

ELECTRIC GENERATORS & MOTORS PHM

Assessing Health Degradation in Aircraft Generators, F. Rufus and N. Propes, RMC Newsletter Article, Knoxville, TN, 2010.
 
Advanced Electrical Signature Analysis of Aircraft Electrical Generators, Rufus, F., Lee, S., Thakker, A., Field, S. A., Kumbar, N., SAE 2009 AeroTech Congress and Exhibition, 2009-01-3162, October 2009.
 
Advanced Diagnostics of Aircraft Electrical Generators, Rufus, F., Lee, S., Thakker, A., Field, S.A., Kumbar, N., SAE International Journal of Aerospace, vol. 1 no. 1, 1064-1070, April 2009.
 
    Advanced Diagnostics of Aircraft Electrical Generators, F. Rufus, S. Lee, A. Thakker, Sean Field and Nathan Kumbar, SAE Power Systems Conference, Paper # 2008-01-2923, November, 2008.

 

CHILLERS, VALVES & PUMPS PHM

Monitoring and Prognostics of Hydraulically Operated Butterfly Valves, B. Jeffries, N. Propes, A. Thakker, B.R. Upadhyaya, and J.W. Hines, Nuclear Plant Instrumentation, Control, and Human-Machine Interface Technologies, Pending July 22-26, 2012.
 
“Diagnostic and Prognostic Health Monitoring of Chillers On-board Naval Vessels" N. Propes, A. Thakker, G. Vachtsevanos, T. Galie, M. McGovern, and M. Franks, ,” ASNE Sea Basing Conference, Arlington, VA, January 27-28, 2005.

 

PHM FRAMEWORKS AND ANALYSIS TOOLS

    A Data Fusion Method for Machine Fault Detection and Identification, Lee, S., Rufus, F., and Thakker, A., IEEE International Conference on Prognostics and Health Management 2008, Denver, CO, October 2008.
 
A Novel Architecture for an Integrated Fault Diagnostic or Prognostic System. Zhang, G., Lee, S., Propes, N., Zhao, Y., Vachtsevanos, G., Thakker, A., Gailie, T;. 2002 AAAI Spring Symposium Technical Proceedings SS-02-03, ISBN 1-57735-148-7
 
A Real Time Architecture for Prognostic Enhancements to Diagnostic Systems. Propes, N., Lee, S., Zhang, G., Zhao, Y., Vachtsevanos, G., Thakker, A., Gailie, T.; MARCON 2002, Knoxville, TN, May 2002
 
A New Confidence Prediction Neural Network for Machine Failure Prognosis. Khiripet, N., Vachtsevanos, G., Thakker, A., Gailie, T. Proceedings of Intelligent Ships Symposium IV, Philadelphia, PA, April 2-3,2001
 
Fault Prognosis Using Dynamic Wavelet Neural Networks. Vachtsevanos, G., Wang, P., Gailie, T., Thakker, A. Proceedings of AUTOTESTCON 2001 Conference, August 20-23, 2001
 
.
An Intelligent Approach to Prognostic Enhancements of Diagnostic Systems. Vachtsevanos, G., Wang, P., Khiripet, N., Thakker, A., Gailie, T. Proceedings of SPIE 15th Annual International Symposium on Aerospace/Defense Sensing, Simulation, and Controls, Orlando, Florida, April 16-20, 2001
 
Barlas, G. Zhang, N. Propes, G. Vachtsevanos, T. Galie, and A. Thakker, "Addressing Uncertainty and Confidence in Prognosis," Intelligent Ship Symposium, Philadelphia, May, 2003.
 
Barlas, G. Zhang, N. Propes, and G. Vachtsevanos, “Confidence Metrics and Uncertainty Management in Prognosis,” MARCON, Knoxville, May, 2003.
 
N. Propes and G. Vachtsevanos, “A Fuzzy Petri Net Based Mode Identification Algorithm for Fault Diagnosis of Complex Systems,” AeroSense, Orlando, Florida, April 21-25, 2003.
 
 
G. Zhang, S. Lee, N. Propes, Y. Zhao, G. Vachtsevanos, A. Thakker, and T. Galie, “A Novel Architecture for an Integrated Fault Diagnostic/Prognostic System,” AAAI Symposium, Stanford, California, March 25-27, 2002.
 
N. Propes, S. Lee, G. Zhang, I. Barlas, Y. Zhao, G. Vachtsevanos, A. Thakker, and T. Galie, “ A Real-Time Architecture for Prognostic Enhancements to Diagnostic Systems,” MARCON, Knoxville, Tennessee, May 6-8, 2002.
 
N. Propes, G. Vachtsevanos and Y. Wardi, “An Object-Oriented Hybrid Modeling Framework for Manufacturing Systems,” IASTED Applied Simulation and Modeling Conference, Crete, Greece, July, 2002.
 
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P. Wang, N. Propes, N. Khiripet, Y. Li, and G. Vachtsevanos, “An Integrated Approach to Machine Fault Diagnosis,” IEEE Annual Textile Fiber and Film Industry Technical Conference, Atlanta, May 4-6, 1999.

 

STRUCTURAL MATERIAL ANALYSIS & LiFE PREDICTION

Accelerated Characterization of Fiber/Epoxy Composites. Part 1: Viscoelastic Methods. Final Report, 1 July 1972 - 30 Sept. 1974. Thakker, A B; Brinson, H F; Heller, R A. (Virginia Polytechnic Inst.and State Univ., Blacksburg. Dept. of Engineering Science and Mechanics.) AD-A014266; AFML-TR-74-256-PT-1; Feb. 1975.
 
Environmental Effects on Fiber Reinforced Composites. Heller, R. A.; Brinson, H. F.; Thakker, A. B. (Va. Polytech Inst. & State Univ., Blacksburg). International Conference on Mater Technology, 4th, Proc, Caracas, Venezuela, June 29-July 4 1975.p 464-471.
 
 
Viscoelastic Characterization of Angle Ply Advanced Composites (including boron and graphite reinforced materials). Ph.D. Thesis.
Thakker, A B. (Virginia Polytechnic Inst. and State Univ., Blacksburg.) Published 1974.
 
Temperature Dependence of the Complex Modulus for Fiber Reinforced Materials.
Heller, R A; Thakker, A B; Arthur, C E. (Virginia Polytechnic Institute and State Univ. Blacksburg, Va.) Composite reliability in ASTM Proceedings, 1975, p. 298-308. ASTM Symposium, Las Vegas, NV, April 15-16, 1974.
 
Time And Temperature Dependence of Boron Epoxy and Graphite Epoxy Laminates.
Technical Report, 1 July 1972 - 30 June 1973.
Heller, R A; Swift, G W; Stinchcomb, W W; Thakker, A B; Liu, J C. (Virginia Polytechnic
Inst. and State Univ. Blacksburg.) AD-774028; AFML-TR-73-261; November 1973
 
Vibration as NDT Tool for Composites
Presented at TMS-AIME Conference on Meeting the Materials Challenge, Niagara Falls, New York, September 1976.
 
Failure of a Titanium Metal Matrix Composite Shell under Internal Pressure Hook, D. A. , Armanios, E. A. , Dancilla, D.S., (Georgia Institute of Technology) Thakker A. B. (Allison Engine Company), Doorbar. P. (Rolls Royce, plc.) Composite Materials : Fatigue and Fracture (Sixth Volume) ASTM STP 1285, 1997, Presented at ASTM Sixth Symposium on Composites: Fatigue and Fracture, Denver, Colorado, May 16-17, 1995.
 
Free Vibration of a Metal Matrix Composite Shell with Circumferential Reinforcement Armanios, E. A., Badir, A. M.., Dancila, D. S. (Georgia Institute of Technology) Thakker A. B. (Rolls Royce Inc.), Doorbar, P. (Rolls Royce, plc.) 35th AIAA/ASME/AHS/ASC Structures, Structural Dynamics and Materials (SDM) Conference, Hilton Head, SC, April 18-20, 1994
 
Fatigue Behavior of Cast XD Gamma Titanium Aluminide Alloys Larsern Jr., D.E., Behrendt, M., Walker, N., Thakker, A., Davidson, D., Clemmens, D. Fatigue and Fracture of Ordered Intermetallic Materials 1 Conference, Pittsburgh, Pennsylvania, Oct. 17-21, 1993.
 
Surfprep Flash-Lamp Depaint System Evaluation. Toriz, F. C.; Thakker, A. B.; Gupta, S. K.;(Rolls Royce Inc, Atlanta, GA) Doxstader, R. (A & R Industries, Oceanside, CA) 17th International Conference on Metallurgical Coatings and 8th International Conference on Thin Films; San Diego, CA, USA; 1990 Apr. 2-6.
 
Ion Implantation to Palliate Machining Damage in Ceramics. A.B. Thakker, F. C. Toriz(Rolls Royce Inc, Atlanta, GA), R. Bhattacharya, P. Pronko(UES Corp, Dayton, OH), DOE contract report, Aug88-Aug 90.
 
Flight Service Evaluation of Thermal Barrier Coatings by Physical Vapor Deposition at 5200 H. Toriz, F. C.; Thakker, A. B.; Gupta, S. K. (Rolls-Royce Inc, Atlanta, GA,) 16th International Conference on Metallurgical Coatings (ICMC) - Part I (of 3); San Diego,CA, USA; 1989 Apr. 17-21.Surface & Coatings Technology v 39-40 1-3 PT1 Dec. 1 1989. p161-172.
 
Thermal Barrier Coatings For Jet Engines
Toriz, F. C.; Thakker, A. B.; Gupta, S. K. (Rolls-Royce, Inc., Atlanta, GA). ASME Gas Turbine and Aeroengine Congress and Exposition, Amsterdam, Netherlands,June 6-9, 1988. 9 p.ASME PAPER 88-GT-279.
 
Particulate Erosion of Ceramic Thermal Barrier Coatings. Toriz, F. C. , Thakker, A. B. and Gupta, S. K.(Rolls Royce Inc, Atlanta,GA)
Presented at American Ceramic Society, Cocoa Beach, FL, Nov 1987 Published 40th Pacific Coast Meeting Proceedings, 8-A-87P, 1988.
 
Ion Implantation of Silicon Nitride for Rolling Element Bearing Applications. Morrison, J. A.; Thakker, A. B.; (Rolls-Royce, Inc., Atlanta, GA). Armini, A. J. (Surface Alloys Inc, Boston, MA)
ACS Annual Conference on Composites and Advanced Ceramic Materials, 12th, Cocoa Beach, FL, Jan. 17-22, 1988. Ceramic Engineering and Science Proceedings, vol. 9, Sept.-Oct. 1988,p. 1265-1275.
 
Development of Fracture Toughened Ceramics for Rolling Element Bearings. AB. Thakker, J. A. Morrison(Rolls Royce Inc, Atlanta, GA)
J. Armini(Surface Alloys Inc, Boston, MA)
Final Report, NASA Lewis Research Center, Contract NAS3-25127, NASA Report FR87-
09, August , 1987.
 
A Philosophy for Thermal Barrier Coating Design and its Corroboration by 10000-H
Service Experience on RB211 Nozzle Guide Vanes. Bennett, A; Toriz, FC; Thakker, AB. (Rolls-Royce plc; Rolls-Royce Inc). Surface & Coatings Technology, 1987, V32, N1-4, P359-375.
 
An Experimental and Numerical Investigation of the Growth and Coalescence of Multiple Fatigue Cracks at Notches. Thakker, A. B. (Pratt & Whitney Aircraft, West Palm Beach, FL)
Grandt, A. F. Jr.; Tritsch, D. E. (Purdue Univ., West Lafayette, IN, Fracture Mechanics: Seventeenth Volume, Seventeenth National Symposium on Fracture Mechanics; Albany, NY, USA; 1984 Aug. 7-9.ASTM Special Technical Publication 905, 1986. p 239-252.
 
Fracture Mechanics of Multiple Crack Initiations. An Application for Fracture Mechanics Analysis of Gas Turbine Engine Disks. Interim Report, Feb. 1981 - June 1983.
Cowles, B A; Thakker, A B; King, G E. (Pratt & Whitney Aircraft, West Palm Beach,Florida, Engineering Div.).AD-A162998/XAB; PW/ED/FR-18778; AFWAL-TR-85- 4110; October 1985.
 
Low Strain, Long Life Creep Fatigue of AF2-1DA and INCO 718. Thakker, A B; Cowles, B A. (Pratt & Whitney Aircraft Group, West Palm Beach, Florida, Government Products Div.) NASA-CR-167989; NAS 1.26:167989; FR-15652; April 1983
 
Low Cycle Fatigue Damage Accumulation Green, R.N. Naval Air Systems Command Report FR-16285, December 1982
 
Ranking 7XXX aluminum alloy fatigue crack growth resistance under constant amplitude and spectrum loading. Bucci, R J; Staley, J T; Thakker, A B; Sander, T H; Sawtell, R R. (Alcoa Research Laboratories, Alcoa Center, PA).
 
Effect of Load Spectrum Variables on Fatigue Crack Initiation and Propagation in ASTM Symposium Proceedings, 1980, p. 41-78.ASTM Symposium, San Francisco, CA, May 21, 1979.
 
Effects of Microstructure on Fatigue Crack Growth of 7XXX Aluminum Alloys under Constant Amplitude and Spectrum Loading. Final Report. Sander, T H, Jr.; Sawtell, R R; Staley, J T; Bucci, R J; Thakker, A B.(Aluminum Co. of America, Alcoa Center, PA). AD-A057129; REPT-56-78-AF8; April 1978
 
Improving Fatigue Resistance of Aluminum Aircraft Alloys. Staley, James T.; Truckner, William G.; Bucci, Robert J.; Thakker, Ashok B. (Alum Co. of Am, Alcoa Center, Pa).Aluminum v 53 n 11 Nov. 1977 p 667-669.
 
Effects of Microstructure on Fatigue Crack Growth of A1-Zn-Mg-Cu Alloys. Staley J T; Truckner W G; Bucci R J; Thakker A B. (Alcoa Labs). Presented at 106th Annual AIME meeting, March 9, 1977, Atlanta GA. Jom-Journal Of Metals, 1976, V28, N12, Pa48.
 
 
Effects of Microstructure on Fatigue Crack Growth of High Strength Aluminum Alloys. Final Technical Report, May 1974 - May 976.Truckner, W G; Staley, J T; Bucci, R J; Thakker, A B. (Aluminum Co. of America, Alcoa Center, PA.) AD-A037156; AFML-TR- 76-169; REPT-56-76-AF5; August 1976.
 
Effects of Microstructure on Fatigue Crack Propagation of Al-Cu-Mg-Mn Alloys Truckner, W.G., Staley, J.T., Mauney, D.A. Presented at International Conference of Materials, Boston, August 1976.
 
Environmental Effects on Fiber-reinforced Composites. Heller R A; Brinson H F; Thakker AB. (Virginia Polytech Inst & State Univ, Dept. Engni & Mech.). Presented at IV Inter- American Conference on Materials Polymer Engineering And Science, 1975, V15, N11, P781-788
 
    Viscoelastic Characterization of Angle Ply Advanced Composites (including boron and graphite reinforced materials). Ph.D. Thesis, Thakker, A B. (Virginia Polytechnic Inst. and State Univ., Blacksburg.), Published 1974.