Publications:

Selected Journal Papers

Madden, R. and Sawicki, J.T., ¿Rotor Model Validation for an Active Magnetic Bearing Machining Spindle Using µ-Synthesis Approach,¿ Paper GT2012-69943, ASME Journal of Engineering for Gas Turbines and Power, vol. 134, September 2012.

Wroblewski, A.C., Sawicki, J.T. and Pesch, A.H., ¿Rotor Model Updating And Validation for an Active Magnetic Bearing Based High-Speed Machining Spindle,¿ Paper GT2012-68661, accepted for publication, ASME Journal of Engineering for Gas Turbines and Power, 2012.

Kulesza, Z. and Sawicki, J.T., ¿Controlled Deflection Approach for Rotor Crack Detection,¿ Paper GT2012-68960, ASME Journal of Engineering for Gas Turbines and Power, vol. 134, September 2012.

Sawicki J.T. and Kulesza Z., ¿A New Rotor Crack Detection Method Based on Auxiliary State Observer,¿ ADVANCES IN VIBRATION ENGINEERING, 11(2) pp. 131-141, 2012.

Kulesza, Z. and Sawicki, J.T., ¿Rigid finite element model of a cracked rotor,¿, Journal of Sound and Vibration,   Vol. 331, Issue 18, pp. 4145-4169, Elsevier Ltd., 2012.

Sawicki, J.T., Storozhev, D. and Lekki, J.D., Exploration of NDE Properties of AMB Supported Rotors for Structural Damage Detection, ASME Journal of Engineering for Gas Turbines and Power, Vol. 133, April 2011.

Sawicki, J.T., Friswell, M.I., Kulesza, Z., Wroblewski, A., and Lekki, J.D., Detecting Cracked Rotors Using Auxiliary Harmonic Excitation, Journal of Sound and Vibration,  Elsevier Ltd., Vol. 330, pp. 1365-1381, 2011.

Kulesza, Z. and Sawicki, J.T., Auxiliary State Variables for Rotor Crack Detection, Journal of Vibration and Control, SAGE, doi: 10.1177/1077546309360050, October 2010.

Gyekenyesi, A., Sawicki, J.T., and Haase W.C., Modeling Disk Cracks in Rotors by Utilizing Speed Dependent Eccentricity, Journal of Materials Engineering and Performance, Springer New York, Vol. 19, No. 2, pp. 207-212, 2010.

Litak, G., and Sawicki, J.T., Crack Identification by Multifractal Analysis of a Dynamic Rotor Response, ZAMM, Journal of Applied Mathematics and Mechanics, Wiley InterScience, Vol. 89, No. 7, pp. 587-592, July 2009.

Sawicki, J.T., Sen, A.K., and Litak, G., Multiresolution Wavelet Analysis of the Dynamics of a Cracked Rotor, International Journal of Rotating Machinery, Hindawi Publishing Company (2009), Article ID 265198, doi:10.1155/2009/265198.

Litak, G. and Sawicki, J.T., Intermittent Behaviour of a Cracked Rotor in the Resonance Region, Chaos, Solitons & Fractals, Vol. 42, Issue 3, pp. 1495-1501, Nov. 2009.

Litak, G., Sawicki, J.T., and Kasperek, R., Cracked Rotor Detection by Recurrence Plots, Nondestructive Testing and Evaluation, Vol. 24, Issue 4, pp. 347-351, December 2009.

Sawicki, J.T., Rotor Crack Detection Using Active Magnetic Bearings, Solid State Phenomena, Special Issue: Mechanical Systems and Materials, Vol. 144, pp. 9-15, 2009.

Sawicki, J.T., Johansson, S.A., Rumbarger, J.H., and Sharpless, R.B., Fatigue Life Prediction for Large-Diameter Elastically-Constrained Ball Bearings, ASME Journal of Engineering for Gas Turbines and Power, Vol. 130 (2), pp. March 2008.

Sawicki, J.T. and Maslen, E.H., Modeling and Performance Evaluation of Machining Spindle with Active Magnetic Bearings, Special Edition of Korean Journal of Mechanical Science and Technology, Vol. 21, No.3, March 2007.

Friswell, M.I., Sawicki, J.T., Inman, D.J., and Lees, A.W., The Response of Rotating Machines on Viscoelastic Supports. International Review of Mechanical Engineering, 1(1), January 2007, 32-40.

Sawicki, J.T., Rotordynamics, Book Review, ASME Journal of Engineering for Gas Turbines and Power, Vol. 128, October 2006.

Sawicki, J.T., Cavitation Effects on the Dynamics of Journal Bearings, International Journal of Applied Mechanics and Engineering, Vol. 10, No. 3, pp. 515-526, 2005, INVITED PAPER, special issue dedicated to Professor Andrew Z. Szeri).

Kasarda, M., Quinn, D.D., Bash, T., Mani, G., Inman, D., Kirk, R.G., Sawicki, J.T., Magnetic Bearings for Non-Destructive Health Monitoring of Rotating Machinery Supported in Conventional Bearings, Key Engineering Materials, Vols. 293-294, pp. 383-390, 2005.

Rao, N. and Sawicki, J.T., Stability Analysis of a Rough Journal Bearing Considering Cavitation Effects, ASME Journal of Tribology , Vol. 127, pp. 112-119, 2005.

Sawicki, J.T., and Rao, N., Cavitation Effect on the Stability of a Submerged Journal Bearing, International Journal of Rotating Machinery, Taylor & Francis, 10(3): 1-6, 2004.

Rao, N. and Sawicki, J.T., Stability Characteristics of Herringbone Grooved Journal Bearings Incorporating Cavitation Effects, ASME Journal of Tribology , Vol. 126, pp. 281-287, April 2004.

Sawicki, J.T. and Rao, T., A Nonlinear Model for Prediction of Dynamic Coefficients in a Hydrodynamic Journal Bearing, International Journal of Rotating Machinery, Taylor & Francis, 10(6), 507-513, 2004.

Rao, N., and Sawicki, J.T., Stability Analysis of Floating Ball Bearing, STLE TRIBOLOGY TRANSACTIONS, Vol. 47(3), pp. 1-6, 2004.

Sawicki, J.T., Montilla-Bravo, A., and Gosiewski, Z., Thermo-Mechanical Behavior of Rotor with Rubbing, International Journal of Rotating Machinery, Taylor & Francis, 9(1): 41-47, 2003.

Rao, N. and Sawicki, J.T., Dynamic Coefficients Prediction in Multi-lobe Journal Bearings Using a Mass Conservation Algorithm, STLE TRIBOLOGY TRANSACTIONS, Vol. 46(3), pp. 414-420, July 2003.

Baaklini, G., Gyekenyesi, A.L., Smith, K.D., Sawicki, J.T., and Brasche, L., Tools for Engine Diagnostics under the NASA Aviation Safety Program, Materials Evaluation, Journal of the American Society for Nondestructive Testing, Vol. 60, No. 7, pp. 878-883, 2002.

Yu, B., and Sawicki, J.T., Comparison of Mobility Method and Mass Conservation Method in a Study of Dynamically Loaded Journal Bearings,  International Journal of Rotating Machinery, Taylor & Francis, 8(1), pp. 71-79, 2002.

Rao, T., and Sawicki, J.T., Linear Stability Analysis for a Hydrodynamic Journal Bearing Considering Cavitation Effects, STLE TRIBOLOGY TRANSACTIONS, Vol. 45(4), pp. 450-456, October 2002.

Sawicki, J.T., Some Advances in Diagnostics of Rotating Machinery Malfunctions, Journal of the Japan Society of Mechanical Engineers, pp. 138-144, September, 2002 (Invited Paper).

Sawicki, J.T. and Genta, G., Modal Uncoupling of Damped Gyroscopic Systems, Journal of Sound and Vibration, 244(3), pp. 431-451, Academic Press, 2001.

Sawicki, J.T. and Rao, T., Nonlinear Prediction of Rotordynamic Coefficients for a Hydrodynamic Journal Bearing, STLE TRIBOLOGY TRANSACTIONS, Vol. 44(3), pp. 367-375, July 2001.

Dunaevsky, V., Sawicki, J.T., Frater, J.L., and Chen, H.,  Analysis of Elastic Distortions of a Piston Ring in the Reciprocating Air Brake Compressor Due to the Installation Stresses, 2000 SAE Transactions, Journal of Commercial Vehicles, ISBN 0-7680-0841-7.

Yu, B., Sawicki, J.T., and Dunaevsky, V., Analytical Solution of Piston Ring Pack Lubrication Problem for Truck Air Brake Compressor,  SAE Technical Publication # 1999-01-3769, and 2000 SAE Transactions, Journal of Commercial Vehicles, ISBN 0-7680-0841-7.

Gawronski, W., and Sawicki, J.T., Structural Damage Detection Using Modal Norms, Journal of Sound and Vibration, 229(1), pp. 194-198, Academic Press, 2000.

Sawicki, J.T., and Yu, B., Analytical Solutions of Piston Ring Lubrication Using Mass Conserving Cavitation Algorithm, STLE TRIBOLOGY TRANSACTIONS, Vol. 43(3), pp. 419-426, July 2000.

Gosiewski, Z., Sawicki, J.T., and Falkowski, K., Introduction to Smart Magnetic Bearings Design, ETH Zurich, ISMB, pp. 531-536, August 2000.

Sawicki, J.T. and Padovan, J., Frequency Driven Phasic Shifting and Elastic-Hysteretic Partitioning Properties of Fractional Mechanical System Representation Schemes, Journal of the Franklin Institute, Pergamon Ltd., 336, pp. 423-433, 1999.

Sawicki, J.T., Padovan, J., and Al-Khatib, R., The Dynamics of Rotor with Rubbing, International Journal of Rotating Machinery, vol. 5, no. 4, pp. 295-304, Gordon and Breach Publishers, 1999.

Yu, B, Sawicki, J.T., Dunaevsky, V., Static and Dynamic Analysis of Bearings for Truck Brake Compressor, SAE Technical Publication # 982828, 1998 (also published in 1998 SAE Transactions, Vol. 107, Journal of Commercial Vehicles, pp. 661-668).

Padovan, J. and Sawicki, J.T., Non-Linear Vibrations of Fractionally Damped Systems, Nonlinear Dynamics, Kluwer Academic Publishers, 16, pp.321-336, 1998.

Gawronski, W.K., and Sawicki, J.T., Comments on Response Errors of Non-proportionally Lightly Damped Structures, Journal of Sound and Vibration, 210(2), pp.285-285, Academic Press, 1998.

Padovan, J., and Sawicki, J.T., Diophantinized Fractional Representations for Nonlinear Elastomeric Media, Computers & Structures, Vol. 66(2), pp. 613-626, 1998.

Sawicki, J.T., and Gawronski, W., Balanced Model Reduction and Control of Rotor-Bearing Systems, ASME Journal of Engineering for Gas Turbines and Power, Vol. 119, April 1997.

Gawronski, W., and Sawicki, J.T., Balanced Dissipative Controllers for Flexible Structures, ASME Journal of Dynamic Systems, Measurement and Control, Vol. 119, March 1997.

Padovan, J., and Sawicki, J.T., Diophantine Type Fractional Derivative Representation of Structural Hysteresis, Part I: Formulation, Computational Mechanics, Springer, Vol. 19, Number 5, pp. 335-341, April 1997.

Sawicki, J.T., and Padovan, J., Diophantine Type Fractional Derivative Representation of Structural Hysteresis, Part II: Fitting, Computational Mechanics, Springer, Vol. 19, Number 5, pp. 341-356, April 1997.

Gawronski, W., and Sawicki, J.T., Error Bounds for Non-Proportionally Lightly Damped Structures, Journal of Sound and Vibration, Academic Press, 200(4), pp. 543-550, 1997.

Padovan, J., Sawicki, J.T., and Leonov, A., Thermodynamic Properties of Fractional Differ-Integro Type Constitutive Relations, Journal of Thermal Stresses, 20(5), pp. 491-504, 1997.

Sawicki, J.T., Capaldi, R.J., and Adams, M.L., Experimental and Theoretical Rotordynamic Characteristics of a Hybrid Journal Bearing, ASME Journal of Tribology , Vol. 118, January 1997.

Gawronski, W., and Sawicki, J.T., Balanced Dissipative Controllers for Flexible Structures, ASME Journal of Dynamic Systems, Measurement and Control, Vol. 119, March 1997.

Sawicki, J.T., Adams, M.L., and Capaldi, R.J., System Identification Methods for Dynamic Testing of Fluid-Film Bearings, International Journal of Rotating Machinery, Gordon and Breach Publishers, Vol. 2, No. 4, pp. 237-245, 1996.




Selected Refereed Conference Proceedings and Other Publications

Sawicki, J.T. and Baaklini, G.Y., Active Structural Health Monitoring of Rotating Machinery, 6th International Workshop on Structural Health Monitoring, Stanford University, September 11-13, 2007.

Sawicki, J.T. and Baaklini, G.Y., Damage Monitoring Techniques of Rotating Shafts/Disks for Propulsion Health Monitoring, The International Conference on Structural Analysis of Advanced Materials ICSAM-2007, September 2-6, 2007, Patras, Greece.

Pilat, A. and Sawicki, J.T., Pattern Recognition Based Shaft Angle Encoder, International Symposium on Stability Control of Rotating Machinery, ISCORMA-4, Calgary, Alberta, Canada, 27-31 August, 2007.

Gosiewski, Z. and Sawicki, J.T., Evaluation of Various Excitation Techniques for Health Monitoring of Rotating Machinery, International Symposium on Stability Control of Rotating Machinery, ISCORMA-4, Calgary, Alberta, Canada, 27-31 August, 2007.

Sawicki, J.T. and Johansson, S.A., The Effect of Structural Distortion on the Fatigue Life of Large Diameter Ball Bearings, International Symposium on Stability Control of Rotating Machinery, ISCORMA-4, Calgary, Alberta, Canada, 27-31 August, 2007.

Sawicki, J.T, Johansson, S.A., Rumbarger, J.H., and Sharpless, R.B., Fatigue Life Prediction for Large-Diameter Elastically-Constrained Ball Bearings, Paper GT2007-27564, Turbo ASME Turbo Expo Conference, May 14-17, 2007, Montreal, Canada.

Sawicki, J.T. and Maslen, E.H., Rotordynamic Response and Identification of AMB Machining Spindle, Paper GT2007-28018, Turbo ASME Turbo Expo Conference, May 14-17, 2007, Montreal, Canada.

Sawicki, J.T. and Maslen, E.H., AMB Controller Design for a Machning Spindle using µ-Synthesis, accepted for The Tenth International Symposium on Magnetic Bearings (ISMB-10), Martigny, Switzerland, August 21-23, 2006.

Sawicki, J.T. and Maslen, E.H., Modeling and Performance Evaluation of Machining Spindle with Active Magnetic Bearings, INVITED PAPER, The 8th International Conference on Motion and Vibration Control, MOVIC 2006, KAIST, Daejeon, Korea, August 27-30, 2006.

Sawicki, J.T. and Baaklini, G.Y., Recent Advances in Vibration Based Damage Detection Techniques for Cracked Rotors, Third European Workshop on Structural Health Monitoring, Granada, Spain, July 5-7, 2006.

Fleming, D.P., Sawicki, J.T., and Poplawski, J.V., Unbalance Response Prediction for Accelerated Rotors with Load-Dependent Nonlinear Bearing Stiffness, International Symposium on Stability Control of Rotating Machinery, ISCORMA-3, Cleveland, OH, 19-23 September, 2005.

Sawicki, J.T., and Rao, N., Stability Analysis of Vertical Flexible Rotor with External Stiffness and Damping Supported on Journal Bearings, International Symposium on Stability Control of Rotating Machinery, ISCORMA-3, Cleveland, OH, 19-23 September, 2005.

Juhasz, A.J., and Sawicki, J.T., Multi-Megawatt Lunar Base Power System with HTGR Heat Source, 3rd International Energy Conversion Engineering Conference, San Francisco, California, 15-18 August, 2005.

Kasarda, M., Quinn, D.D., Bash, T., Mani, G., Inman, D., Kirk, R.G., Sawicki, J.T., Magnetic Bearings for Non-Destructive Health Monitoring of Rotating Machinery Supported in Conventional Bearings, 6th International Conference on Damage Assesment of Structures, Gdansk, Poland, 4-6 July, 2005.

Sawicki, J.T. and Baaklini, G.Y., Vibration Based Damage Detection Techniques for Cracked Rotors, INVITED PAPER, 47th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 1-4 May, 2006.

Sawicki, J.T., Gyekenyesi, A.L., and Baaklini, G., Rotor Fault Diagnosis Utilizing Active Magnetic Bearings, SPIE's 13h Annual International Symposium on Smart Structures and Materials, San Diego, California, February 26 ¿ March 2, 2006.

Gyekenyesi, A.L., Sawicki, J.T., Baaklini, G.Y., A Broadband, Capacitive Based Wireless Slip Ring for Application in Turbomachinery, 2005 Research & Technology, NASA/TM-2006.

Fleming, D.P., Murphy, B., Sawicki, J.T., and Poplawski, J., Transient Response of Rotor on Rolling Element Bearings with Clearance and with Load-Dependent Nonlinear Stiffness, accepted for IFToMM 7th International Conference on Rotor Dynamics, Vienna, Austria, September 25-28, 2006 (also NASA/TM Publication, 2006-214408, October 2006).

Friswell, M.I., Sawicki, J.T., Inman, D.J., and Lees, A., The Response of Rotating Machines on Viscoelastic Supports, ISMA International Conference on Noise and Vibration Engineering, Leuven, Belgium, September 18-20, 2006.

Juhasz, A.J., and Sawicki, J.T., Lunar Surface Gas Turbine Power Systems with Fission Reactor Heat Sources, NASA/TM Publication, 2005-214003, November 2005.

Sawicki, J.T.and Bischof, J.T., Dynamic Response and Performance Evaluation of High Speed Machining Spindle with Active Magnetic Bearings, ISMST-8, INVITED PAPER, International Symposium on Magnetic Suspension Technology, Dresden, Germany, September 26-28, 2005.

Sawicki, J.T., and Rao, N., Limiting Stiffness and Damping Coefficients of Foil Bearing, ASME Paper DETC2005-84550, ASME Inernational Conference, 20th Biennial Conference on Mechanical Vibration and Noise, Long Beach, CA, September 24-28, 2005.

Gyekenyesi, A., Sawicki, J.T., Martin, R.E., Haase, W.C., and Baaklini, G.Y., Vibration Based Crack Detection in a Rotating Disk, Part 2¿Experimental Results, NASA/TM Publication, 2005-212624/PART2, September 2005.

Wu, X., Sawicki, J.T., Friswell, M.I., and Baaklini, G., Finite Element Analysis of Coupled Lateraland Torsional Vibration of a Rotor with Multiple Cracks, Paper GT2005-68839, Turbo ASME Turbo Expo Conference, June 6-9, 2005, Reno-Tahoe, Nevada.

Gyekenyesi, A., Martin, R.E., Sawicki, J.T., Baaklini, G.Y., Damage Assessment of Aerospace Structural Components by Impedance Based Health Monitoring, NASA/TM Publication, 2005-213579.

Sawicki, J.T., and Rao, N., Performance Characteristics of Wave Journal-Foil Bearing, STLE Annual Meeting, Las Vegas, NV, May 15-19, 2005.

Gyekenyesi, A.L., Sawicki, J.T., and Martin, R., In-Situ Damage Assessment of a Rotating Disk, ASNT 14th Annual Research Symposium, Albuquerque, New Mexico, 14-18 March, 2005.

Sawicki, J.T., Gyekenyesi, A.L., and Baaklini, G., Vibration-Based Diagnostics of Cracked Disks, ASNT 14th Annual Research Symposium, Albuquerque, New Mexico, 14-18 March, 2005.

Martin, R.E., Gyekenyesi, A.L., and Sawicki, J.T., Structural Damage Assessment of Propulsion System Components by Impedance Based Health Monitoring, SPIE's 12th Annual International Symposium on Smart Structures and Materials, San Diego, California, March 6-10, 2005.

Sawicki, J.T., Wu, X., Gyekenyesi, A.L., and Baaklini, G., Application of Nonlinear Dynamics Tools for Diagnosis of Cracked Rotor Vibration Signatures, SPIE's 12th Annual International Symposium on Smart Structures and Materials, San Diego, California, March 6-10, 2005.

Sawicki, J.T. and Rao, N., Stability Analysis of a Rough Journal Bearing Considering Cavitation Effects, 2004 STLE/ASME International Tribology Conference, Long Beach, CA (also ASME Journal of Tribology , Vol. 127, pp. 112-119, 2005).

Sawicki, J.T., Baaklini, G.Y., and Gyekenyesi, A.L., Dynamic Analysis of Accelerating Cracked Flexible Rotor, Paper GT2004-54095, Turbo ASME Turbo Expo Conference, 14-17 June, 2004, Vienna, Austria.

Dimofte, F., Lambrulescu, M.I., and Sawicki, J.T., Influence of Oil Inlet Pressure and Bearing Temperature on an Unloaded Wave/Plain Journal Bearing Stability; Theory versus Experiments,  STLE Annual Meeting & Exhibition, May 17-20, 2004, Toronto, Canada.

Lambrulescu, M.I., Dimofte, F., and Sawicki, J.T., Experimental Investigation on the Influence of Oil Inlet Pressure on the Stability of Wave Journal Bearing,  The 10th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC-10, Honolulu, Hawaii, March 7-11, 2004.

Sawicki, J.T., Gyekenyesi, A.L., and Baaklini, G., Analysis of Transient Response of Cracked Flexible Rotor, SPIE's 11th Annual International Symposium on Smart Structures and Materials, San Diego, California, March 14-18, 2004.

Juhasz, A.J., and Sawicki, J.T., High Temperature Reactor Heat Source Cooling using Brayton Cycle Based Partial Energy Conversion, Space Technology & Applications International Forum (STAIF-2004), Albuquerque, NM, February 8-12, 2004.

Rao, N. and Sawicki, J.T., Stability Characteristics of Herringbone Grooved Journal Bearings Incorporating Cavitation Effects, STLE/ASME International Tribology Conference, Ponte Vedra,  (also publication in ASME Journal of Tribology , 2004).