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Jerzy T. Sawicki
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Proceedings Papers

Model-Based Assist-as-Needed Control on a Provisional Pediatric Lower-Limb Orthosis

Jason J. Wiebrecht, Jacob A. Strick, Anthony Goo, Jerzy T. Sawicki
Proc. ASME. IMECE2023, Volume 5: Biomedical and Biotechnology, V005T06A031, October 29–November 2, 2023
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2023-109505
https://doi.org/10.1115/IMECE2023-109505
View Paper titled, Model-Based Assist-as-Needed Control on a Provisional Pediatric Lower-Limb Orthosis
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Topics: Exoskeleton devices, Orthotics, Pediatrics, Control equipment, Torque, Knee, Errors, Simulation, Frequency response, Patient treatment
Journal Articles

A Novel Gait Event Detection Algorithm Using a Thigh-Worn Inertial Measurement Unit and Joint Angle Information

Jacob A. Strick, Ryan J. Farris, Jerzy T. Sawicki
Journal: Journal of Biomechanical Engineering
Publisher: ASME
Article Type: Technical Briefs
J Biomech Eng. April 2024, 146(4): 044502.
Paper No: BIO-23-1234
https://doi.org/10.1115/1.4064435
Published Online: January 29, 2024
View Article titled, A Novel Gait Event Detection Algorithm Using a Thigh-Worn Inertial Measurement Unit and Joint Angle Information
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Topics: Algorithms, Measurement units and standards, Knee
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
Publisher: ASME
Article Type: Research-Article
J. Dyn. Sys., Meas., Control. June 2022, 144(6): 061008.
Paper No: DS-21-1273
https://doi.org/10.1115/1.4053946
Published Online: March 22, 2022
View Article titled, Hybrid Zero Dynamics Control of an Underactuated Lower-Limb Exoskeleton for Gait Guidance
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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
Publisher: ASME
Article Type: Design Innovation Paper
J Biomech Eng. October 2021, 143(10): 105001.
Paper No: BIO-20-1420
https://doi.org/10.1115/1.4051214
Published Online: June 17, 2021
View Article titled, An Anthropometrically Parameterized Assistive Lower Limb Exoskeleton
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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
Publisher: ASME
Article Type: Research-Article
J. Dyn. Sys., Meas., Control. September 2021, 143(9): 091004.
Paper No: DS-20-1460
https://doi.org/10.1115/1.4050504
Published Online: April 15, 2021
View Article titled, A Robust Impedance Controller for Improved Safety in Human–Robot Interaction
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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
Publisher: American Society of Mechanical Engineers
Paper No: DETC99/VIB-8374
https://doi.org/10.1115/DETC99/VIB-8374
View Paper titled, Structural Damage Detection Using Modal Norms
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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
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-15241
https://doi.org/10.1115/GT2020-15241
View Paper titled, Computational Cost Reduction of MIMO Controllers for Active Magnetic Bearing Systems
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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
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-14943
https://doi.org/10.1115/GT2020-14943
View Paper titled, Pumping Loss of Shrouded Meshed Spur Gears
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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
Publisher: American Society of Mechanical Engineers
Paper No: DETC2001/VIB-21388
https://doi.org/10.1115/DETC2001/VIB-21388
View Paper titled, Modal Control of Flywheel Motion in Magnetic Bearings
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Topics: Flywheels, Magnetic bearings, Satellites, Control systems, Dynamics (Mechanics), Instrumentation, Sensors, Shades and shadows, Solar energy, Vacuum
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
Publisher: American Society of Mechanical Engineers
Paper No: DETC2001/VIB-21740
https://doi.org/10.1115/DETC2001/VIB-21740
View Paper titled, Control of Magnetic Bearing Spindles During N-Waved Machining
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Topics: Machining, Magnetic bearings, Control systems, Adaptive control, Dynamics (Mechanics), Gain scheduling, Open loop systems
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
Publisher: American Society of Mechanical Engineers
Paper No: DETC2001/VIB-21393
https://doi.org/10.1115/DETC2001/VIB-21393
View Paper titled, Modal Estimation of Gyroscopic Effect in Rotordynamic Systems
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Topics: Control equipment, Damping, Design, Equations of motion, Rotors
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
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. November 2020, 142(11): 111002.
Paper No: GTP-20-1567
https://doi.org/10.1115/1.4048486
Published Online: October 15, 2020
View Article titled, Computational Cost Reduction of MIMO Controllers for Active Magnetic Bearing Systems
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Topics: Control equipment
Journal Articles

Pumping Loss of Shrouded Meshed Spur Gears

Michael J. Hurrell, Jerzy T. Sawicki
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. November 2020, 142(11): 111003.
Paper No: GTP-20-1568
https://doi.org/10.1115/1.4048487
Published Online: October 15, 2020
View Article titled, Pumping Loss of Shrouded Meshed Spur Gears
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Topics: Clearances (Engineering), Computational fluid dynamics, Flow (Dynamics), Gears, Pressure, Spur gears, Stress, NASA, Drag (Fluid dynamics), Test facilities
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
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2019-10515
https://doi.org/10.1115/IMECE2019-10515
View Paper titled, Cancelling Gyroscopic Effects in AMB Systems With Flexible Rotors via Modal Feedback
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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
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2019-10503
https://doi.org/10.1115/IMECE2019-10503
View Paper titled, Robust Control-Oriented Modeling of a Feedback-Linearized Powered Pediatric Lower-Limb Orthosis
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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
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-77108
https://doi.org/10.1115/GT2018-77108
View Paper titled, Application of Simplified Parametric Model to Estimate Fan Blade-Out Response
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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
Publisher: American Society of Mechanical Engineers
Paper No: DETC2017-67599
https://doi.org/10.1115/DETC2017-67599
View Paper titled, Design and Preliminary Evaluation of a Powered Pediatric Lower Limb Orthosis
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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
Publisher: American Society of Mechanical Engineers
Paper No: SMASIS2016-9182
https://doi.org/10.1115/SMASIS2016-9182
View Paper titled, Carbon Fiber Composite Beam Damage Model Identification
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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
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-58113
https://doi.org/10.1115/GT2016-58113
View Paper titled, Parametrically Induced Damping in a Cracked Rotor
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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
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. January 2017, 139(1): 012505.
Paper No: GTP-16-1262
https://doi.org/10.1115/1.4034197
Published Online: August 16, 2016
View Article titled, Parametrically Induced Damping in a Cracked Rotor
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Topics: Damping, Fracture (Materials), Rotors, Stability, Vibration, Stiffness, Antiresonance