Publications:

Selected Journal Papers

Laubscher, C.A., Farris, R.J., van den Bogert, A.J. and Sawicki, J.T., ¿Assistive Control of an Anthropometrically Parametrized Lower-Limb Exoskeleton,¿ Design Innovation Paper, ASME Journal of Biomechanical Engineering, https://doi.org/10.1115/1.4051214, 2021.

Laubscher, C.A. and Sawicki, J.T., ¿Robust Impedance Controller for Improved Safety in Human-Robot Interaction,¿ ASME Journal of Dynamic Systems, Measurement and Control,  https://doi.org/10.1115/1.4050504, 2021.

Goo, A., Laubscher, C.A., Farris, R.J. and Sawicki, J.T., ¿Design and Evaluation of a Pediatric Lower-Limb Exoskeleton Joint Actuator,¿ Actuators, 9(4), 138, 2020.

Sahinkaya, A. and Sawicki, J.T., ¿Robust Control of AMB Systems with an Add-on Controller to Cancel Gyroscopic Effects, Is It Worth It?,¿ Journal of Vibration Control, https://doi.org/10.1177/1077546320966194, 2020.

Laubscher, C.A., Farris, R.J. and Sawicki, J.T., ¿Angular momentum-based control of an underactuated orthotic system for standing balance,¿ Autonomous Robots, 44(8), 1469-1484, Springer 2020.

Sahinkaya, A., Hawkins, L. and Sawicki, J.T., ¿Computational Cost Reduction of MIMO Controllers for Active Magnetic Bearing Systems, ASME Journal of Engineering for Gas Turbines and Power,¿ https://doi.org/10.1115/1.4048486, 2020.

Hurrell, M. and Sawicki, J.T., ¿Pumping Loss of Shrouded Meshed Spur Gears,¿ ASME Journal of Engineering for Gas Turbines and Power, https://doi.org/10.1115/1.4048487, 2020 (2020 BEST Paper Award ¿ASME/IGTI).

Sahinkaya, A. and Sawicki, J.T., ¿Computationally Efficient Implementation of Robust Controllers in Active Magnetic Bearing Systems,¿ Mechanical Systems and Signal Processing, vol. 144, 106902. Elsevier, 2020.

Pesch, A.H. and Sawicki, J.T., ¿Active Magnetic Bearing Online Levitation Recovery through ¿-Synthesis Robust Control,¿ Special Issue "Active Magnetic Bearing Actuators,¿ Actuators, MDPI AG, 6(1), 2; doi:10.3390/act60100022017, 2017.

Kulesza, Z. and Sawicki, J.T., ¿Parametrically Induced Damping in a Cracked Rotor,¿ ASME Journal of Engineering for Gas Turbines and Power, 139(1), 012505 (8 pages), Jan. 2017.

Kulesza, Z. and Sawicki, J.T., ¿Damping by parametric excitation in a set of reduced-order cracked rotor systems,¿ Journal of Sound and Vibration, Vol. 354, pp. 167¿179, 2015.

Sawicki, J.T. and Kulesza, Z., ¿Damping in a Parametrically Excited Cracked Rotor,¿ Mechanisms and Machine Science, Vol. 21, pp. 335-345, Springer, 2015.

Pesch, A.H., Smirnov, A. Pyrhönen, O., and Sawicki, J.T., ¿Magnetic Bearing Spindle Tool Tracking through ¿-Synthesis Robust Control,¿ IEEE Transactions on Mechatronics, Volume 20, Issue 3, pp. 1448-1457, June 2015.

Sawicki, J.T. and Kulesza, Z., ¿Stability of a Cracked Rotor Subjected to Parametric Excitation,¿ ASME Journal of Engineering for Gas Turbines and Power, 137(5), 052508 (8 pages), May 2015.

Smirnov, A., Pesch, A.H., Pyrhönen, O., and Sawicki, J.T., ¿High-Precision Cutting Tool Tracking with a Magnetic Bearing Spindle, ASME Journal of Dynamic Systems, Measurement and Control, 137(5), 051017 (8 pages), May 2015.

Madden, R. and Sawicki, J.T., ¿Model Validation for Identification of Damage Dynamics,¿ ASME Journal of Engineering for Gas Turbines and Power, 137(6), 062506 (7 pages), June 2015. doi:10.1115/1.4028845, 2015.

Wroblewski, A.C., Pesch, A.H., and Sawicki, J.T., ¿Structural Change Quantification in Rotor Systems Based on Resonance and Antiresonance Frequencies Extracted from Frequency Response Functions,¿ ASME Journal of Engineering for Gas Turbines and Power, vol. 136(2), doi:10.1115/1.4025484, 2014.

Litak, G., and Sawicki, J.T., ¿Regular and chaotic vibrations in the rub impact model of a Jeffcott rotor
with a fractional restore force,¿ The European Physical Journal - Applied Physics, Volume 64, Number 3, December 2013.

Sawicki, J.T., ¿Control Driven Advances in Smart Rotating Machinery,¿ Solid State Phenomena, Special Issue: Mechatronic Systems and Materials, Vol. 198, pp. 457-467, 2013.

Kulesza, Z. and Sawicki, J.T., ¿New Finite Element Modeling Approach of a Propagating Shaft Crack,¿ ASME Journal of Applied Mechanics,   JAM-12-1101, 120151 (18 pages), 2012.

Kulesza, Z. and Sawicki, J.T. and Gyekenyesi, A., ¿Robust fault detection filter using LMI approach for shaft crack diagnosis,¿ Journal of Vibration and Control,   JVC-11-0375,  2012.

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.