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Jerzy T. Sawicki
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Journal Articles

Hybrid Zero Dynamics Control of an Underactuated Lower-Limb Exoskeleton for Gait Guidance

Anthony Goo, Curt A. Laubscher, Jerzy T. Sawicki
Journal: Journal of Dynamic Systems, Measurement, and Control
Article Type: Research-Article
J. Dyn. Sys., Meas., Control. June 2022, 144(6): 061008.
Paper No: DS-21-1273
DOI: https://doi.org/10.1115/1.4053946
Published Online: March 22, 2022
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Topics: Control equipment, Dynamics (Mechanics), Exoskeleton devices, Optimization, Simulation
Journal Articles

An Anthropometrically Parameterized Assistive Lower Limb Exoskeleton

Curt A. Laubscher, Ryan J. Farris, Antonie J. van den Bogert, Jerzy T. Sawicki
Journal: Journal of Biomechanical Engineering
Article Type: Design Innovation Paper
J Biomech Eng. October 2021, 143(10): 105001.
Paper No: BIO-20-1420
DOI: https://doi.org/10.1115/1.4051214
Published Online: June 17, 2021
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Topics: Exoskeleton devices, Design methodology, Knee, Torque
Journal Articles

A Robust Impedance Controller for Improved Safety in Human–Robot Interaction

Curt A. Laubscher, Jerzy T. Sawicki
Journal: Journal of Dynamic Systems, Measurement, and Control
Article Type: Research-Article
J. Dyn. Sys., Meas., Control. September 2021, 143(9): 091004.
Paper No: DS-20-1460
DOI: https://doi.org/10.1115/1.4050504
Published Online: April 15, 2021
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Topics: Boundary layers, Control equipment, Signals, Sliding mode control, Switches, Safety, Human-robot interaction, Chatter
Proceedings Papers

Structural Damage Detection Using Modal Norms

Wodek Gawronski, Jerzy T. Sawicki
Proc. ASME. DETC99, Volume 7A: 17th Biennial Conference on Mechanical Vibration and Noise, 913-917, September 12–16, 1999
Paper No: DETC99/VIB-8374
DOI: https://doi.org/10.1115/DETC99/VIB-8374
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Topics: Damage, Sensors
Proceedings Papers

Computational Cost Reduction of MIMO Controllers for Active Magnetic Bearing Systems

Alican Sahinkaya, Larry Hawkins, Jerzy T. Sawicki
Proc. ASME. GT2020, Volume 10B: Structures and Dynamics, V10BT29A017, September 21–25, 2020
Paper No: GT2020-15241
DOI: https://doi.org/10.1115/GT2020-15241
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Topics: Control equipment, Magnetic bearings, Dynamic response, Dynamics (Mechanics), Hardware, Machining, Modal assurance criterion, Permanent magnets, Turbogenerators
Proceedings Papers

Pumping Loss of Shrouded Meshed Spur Gears

Michael J. Hurrell, Jerzy T. Sawicki
Proc. ASME. GT2020, Volume 10B: Structures and Dynamics, V10BT29A012, September 21–25, 2020
Paper No: GT2020-14943
DOI: https://doi.org/10.1115/GT2020-14943
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Topics: Computational fluid dynamics, Spur gears
Proceedings Papers

Modal Control of Flywheel Motion in Magnetic Bearings

Zdzislaw Gosiewski, Jerzy T. Sawicki
Proc. ASME. IDETC-CIE2001, Volume 6A: 18th Biennial Conference on Mechanical Vibration and Noise, 741-748, September 9–12, 2001
Paper No: DETC2001/VIB-21388
DOI: https://doi.org/10.1115/DETC2001/VIB-21388
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Topics: Flywheels, Magnetic bearings, Satellites, Control systems, Dynamics (Mechanics), Instrumentation, Sensors, Shades and shadows, Solar energy, Vacuum
Proceedings Papers

Modal Estimation of Gyroscopic Effect in Rotordynamic Systems

Jerzy T. Sawicki
Proc. ASME. IDETC-CIE2001, Volume 6A: 18th Biennial Conference on Mechanical Vibration and Noise, 783-789, September 9–12, 2001
Paper No: DETC2001/VIB-21393
DOI: https://doi.org/10.1115/DETC2001/VIB-21393
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Topics: Control equipment, Damping, Design, Equations of motion, Rotors
Proceedings Papers

Control of Magnetic Bearing Spindles During N-Waved Machining

Zdzislaw Gosiewski, Jerzy T. Sawicki, Kenneth R. Bischof
Proc. ASME. IDETC-CIE2001, Volume 6C: 18th Biennial Conference on Mechanical Vibration and Noise, 3111-3118, September 9–12, 2001
Paper No: DETC2001/VIB-21740
DOI: https://doi.org/10.1115/DETC2001/VIB-21740
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Topics: Machining, Magnetic bearings, Control systems, Adaptive control, Dynamics (Mechanics), Gain scheduling, Open loop systems
Journal Articles

Pumping Loss of Shrouded Meshed Spur Gears

Michael J. Hurrell, Jerzy T. Sawicki
Journal: Journal of Engineering for Gas Turbines and Power
Article Type: Research-Article
J. Eng. Gas Turbines Power. November 2020, 142(11): 111003.
Paper No: GTP-20-1568
DOI: https://doi.org/10.1115/1.4048487
Published Online: October 15, 2020
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Topics: Clearances (Engineering), Computational fluid dynamics, Flow (Dynamics), Gears, Pressure, Spur gears, Stress, NASA, Drag (Fluid dynamics), Test facilities
Journal Articles

Computational Cost Reduction of MIMO Controllers for Active Magnetic Bearing Systems

Alican Sahinkaya, Larry Hawkins, Jerzy T. Sawicki
Journal: Journal of Engineering for Gas Turbines and Power
Article Type: Research-Article
J. Eng. Gas Turbines Power. November 2020, 142(11): 111002.
Paper No: GTP-20-1567
DOI: https://doi.org/10.1115/1.4048486
Published Online: October 15, 2020
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Topics: Control equipment
Proceedings Papers

Cancelling Gyroscopic Effects in AMB Systems With Flexible Rotors via Modal Feedback

Alican Sahinkaya, Jerzy T. Sawicki
Proc. ASME. IMECE2019, Volume 4: Dynamics, Vibration, and Control, V004T05A001, November 11–14, 2019
Paper No: IMECE2019-10515
DOI: https://doi.org/10.1115/IMECE2019-10515
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Topics: Feedback, Rotors, Control equipment, Design, Uncertainty, Dynamics (Mechanics), Frequency response, Magnetic bearings, Rotational inertia, State feedback
Proceedings Papers

Robust Control-Oriented Modeling of a Feedback-Linearized Powered Pediatric Lower-Limb Orthosis

Curt A. Laubscher, Jerzy T. Sawicki
Proc. ASME. IMECE2019, Volume 4: Dynamics, Vibration, and Control, V004T05A013, November 11–14, 2019
Paper No: IMECE2019-10503
DOI: https://doi.org/10.1115/IMECE2019-10503
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Topics: Feedback, Modeling, Orthotics, Pediatrics, Uncertainty, Control equipment, Nonlinear systems, Robust control, Design, Frequency response
Proceedings Papers

Application of Simplified Parametric Model to Estimate Fan Blade-Out Response

Theodore S. Brockett, Jerzy T. Sawicki
Proc. ASME. GT2018, Volume 7A: Structures and Dynamics, V07AT33A027, June 11–15, 2018
Paper No: GT2018-77108
DOI: https://doi.org/10.1115/GT2018-77108
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Topics: Blades, Engines, Strips, Whirls, Machining, Pressure, Degrees of freedom, Dynamic response, Friction, Momentum
Proceedings Papers

Design and Preliminary Evaluation of a Powered Pediatric Lower Limb Orthosis

Curt A. Laubscher, Ryan J. Farris, Jerzy T. Sawicki
Proc. ASME. IDETC-CIE2017, Volume 5A: 41st Mechanisms and Robotics Conference, V05AT08A061, August 6–9, 2017
Paper No: DETC2017-67599
DOI: https://doi.org/10.1115/DETC2017-67599
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Topics: Design, Orthotics, Pediatrics, Actuators, Knee, Engineering prototypes, Errors, Torque, Electronics, Friction
Proceedings Papers

Carbon Fiber Composite Beam Damage Model Identification

Alexander H. Pesch, Ryan J. Madden, Richard E. Martin, Jerzy T. Sawicki
Proc. ASME. SMASIS2016, Volume 1: Multifunctional Materials; Mechanics and Behavior of Active Materials; Integrated System Design and Implementation; Structural Health Monitoring, V001T05A016, September 28–30, 2016
Paper No: SMASIS2016-9182
DOI: https://doi.org/10.1115/SMASIS2016-9182
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Topics: Carbon fibers, Composite building materials, Damage, Carbon reinforced plastics, Control equipment, Composite materials, Curve fitting, Damping, Dynamics (Mechanics), Errors
Proceedings Papers

Parametrically Induced Damping in a Cracked Rotor

Zbigniew Kulesza, Jerzy T. Sawicki
Proc. ASME. GT2016, Volume 7A: Structures and Dynamics, V07AT32A033, June 13–17, 2016
Paper No: GT2016-58113
DOI: https://doi.org/10.1115/GT2016-58113
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Topics: Damping, Rotors, Fracture (Materials), Excitation, Stiffness, Vibration, Accidents, Antiresonance, Crack detection, Damage
Journal Articles

Parametrically Induced Damping in a Cracked Rotor

Zbigniew Kulesza, Jerzy T. Sawicki
Journal: Journal of Engineering for Gas Turbines and Power
Article Type: Research-Article
J. Eng. Gas Turbines Power. January 2017, 139(1): 012505.
Paper No: GTP-16-1262
DOI: https://doi.org/10.1115/1.4034197
Published Online: August 16, 2016
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Topics: Damping, Fracture (Materials), Rotors, Stability, Vibration, Stiffness, Antiresonance
Proceedings Papers

Stabilizing Hydrodynamic Bearing Oil Whip With μ-Synthesis Control of an Active Magnetic Bearing

Alexander H. Pesch, Jerzy T. Sawicki
Proc. ASME. GT2015, Volume 7A: Structures and Dynamics, V07AT31A029, June 15–19, 2015
Paper No: GT2015-44059
DOI: https://doi.org/10.1115/GT2015-44059
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Topics: Bearings, Magnetic bearings, Control equipment, Rotation, Rotors, Vibration, Whirls, Design, Fluid films, Robust control
Journal Articles

Model Validation for Identification of Damage Dynamics

Ryan J. Madden, Jerzy T. Sawicki, Alexander H. Pesch
Journal: Journal of Engineering for Gas Turbines and Power
Article Type: Research-Article
J. Eng. Gas Turbines Power. June 2015, 137(6): 062506.
Paper No: GTP-14-1553
DOI: https://doi.org/10.1115/1.4028845
Published Online: June 1, 2015
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Topics: Damage, Dynamics (Mechanics), Model validation, Rotors, Uncertainty, Stiffness