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Journal Articles

Generalized SmartScan: An Intelligent LPBF Scan Sequence Optimization Approach for Reduced Residual Stress and Distortion in Three-Dimensional Part Geometries

Chuan He, Nathaniel Wood, Nevzat Bircan Bugdayci, Chinedum Okwudire
Journal: Journal of Manufacturing Science and Engineering
Publisher: ASME
Article Type: Research Papers
J. Manuf. Sci. Eng. April 2025, 147(4): 041001.
Paper No: MANU-24-1557
https://doi.org/10.1115/1.4066977
Published Online: November 21, 2024
View Article titled, Generalized SmartScan: An Intelligent LPBF Scan Sequence Optimization Approach for Reduced Residual Stress and Distortion in Three-Dimensional Part Geometries
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Topics: Lasers, Optimization, Printing, Simulation, Stress, Temperature, Heat, Deformation, Temperature distribution, Additive manufacturing
Journal Articles

Special Section: Manufacturing Science Engineering Conference 2024

Chinedum Okwudire, Albert Shih
Journal: Journal of Manufacturing Science and Engineering
Publisher: ASME
Article Type: Guest Editorial
J. Manuf. Sci. Eng. November 2024, 146(11): 110301.
Paper No: MANU-24-1648
https://doi.org/10.1115/1.4066617
Published Online: October 4, 2024
View Article titled, Special Section: Manufacturing Science Engineering Conference 2024
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Topics: Manufacturing
Proceedings Papers

An Investigation of the Effects of Vibration Compensation on Print Quality of High-Speed Metal Extrusion Based Additive Manufacturing

Sajad Shirzad, Cheng-Hao Chou, Alexandru Versin, Osama Habbal, Chinedum Okwudire, Christopher Pannier
Proc. ASME. MSEC2024, Volume 1: Additive Manufacturing; Advanced Materials Manufacturing; Biomanufacturing; Life Cycle Engineering, V001T01A013, June 17–21, 2024
Publisher: American Society of Mechanical Engineers
Paper No: MSEC2024-123906
https://doi.org/10.1115/MSEC2024-123906
View Paper titled, An Investigation of the Effects of Vibration Compensation on Print Quality of High-Speed Metal Extrusion Based Additive Manufacturing
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Topics: Additive manufacturing, Extruding, Metals, Vibration
Proceedings Papers

MScan: An Automated In-Situ Fault Detection System for Desktop Fused Filament Fabrication 3D Printers Utilizing a Non-Contact Sensor

Hanyao Lyu, Pinyi Wu, Chinedum Okwudire
Proc. ASME. MSEC2024, Volume 1: Additive Manufacturing; Advanced Materials Manufacturing; Biomanufacturing; Life Cycle Engineering, V001T01A029, June 17–21, 2024
Publisher: American Society of Mechanical Engineers
Paper No: MSEC2024-124650
https://doi.org/10.1115/MSEC2024-124650
View Paper titled, MScan: An Automated In-Situ Fault Detection System for Desktop Fused Filament Fabrication 3D Printers Utilizing a Non-Contact Sensor
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Topics: Additive manufacturing, Flaw detection, Lasers, Manufacturing, Sensors
Proceedings Papers

Brief Paper: A Preliminary Study on Depowdering of Fragile Objects Using Robots in Binder Jetting Additive Manufacturing

Junjiang Ye, Md Moktadir Alam, Chinedum Okwudire
Proc. ASME. MSEC2024, Volume 1: Additive Manufacturing; Advanced Materials Manufacturing; Biomanufacturing; Life Cycle Engineering, V001T01A035, June 17–21, 2024
Publisher: American Society of Mechanical Engineers
Paper No: MSEC2024-125150
https://doi.org/10.1115/MSEC2024-125150
View Paper titled, Brief Paper: A Preliminary Study on Depowdering of Fragile Objects Using Robots in Binder Jetting Additive Manufacturing
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Topics: Additive manufacturing, Binders (Materials), Robots
Proceedings Papers

A Versatile Point Cloud Registration Method for Quantifying Geometric Deviation in Additive Manufacturing

Chuan He, Chinedum Okwudire
Proc. ASME. MSEC2023, Volume 1: Additive Manufacturing; Advanced Materials Manufacturing; Biomanufacturing; Life Cycle Engineering, V001T01A029, June 12–16, 2023
Publisher: American Society of Mechanical Engineers
Paper No: MSEC2023-105507
https://doi.org/10.1115/MSEC2023-105507
View Paper titled, A Versatile Point Cloud Registration Method for Quantifying Geometric Deviation in Additive Manufacturing
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Topics: Additive manufacturing
Proceedings Papers

On the Friction Isolator for Precision Motion Control and its Dynamics

Xin Dong, Chinedum Okwudire, Jiamin Wang, Oumar Barry
Proc. ASME. IDETC-CIE2019, Volume 8: 31st Conference on Mechanical Vibration and Noise, V008T10A067, August 18–21, 2019
Publisher: American Society of Mechanical Engineers
Paper No: DETC2019-98354
https://doi.org/10.1115/DETC2019-98354
View Paper titled, On the Friction Isolator for Precision Motion Control and its Dynamics
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Topics: Dynamics (Mechanics), Friction, Motion control, Stability
Proceedings Papers

Proxy-Based Optimal Dynamic Control Allocation for Multi-Input, Multi-Output Over-Actuated Systems

Molong Duan, Chinedum Okwudire
Proc. ASME. DSCC2017, Volume 1: Aerospace Applications; Advances in Control Design Methods; Bio Engineering Applications; Advances in Non-Linear Control; Adaptive and Intelligent Systems Control; Advances in Wind Energy Systems; Advances in Robotics; Assistive and Rehabilitation Robotics; Biomedical and Neural Systems Modeling, Diagnostics, and Control; Bio-Mechatronics and Physical Human Robot; Advanced Driver Assistance Systems and Autonomous Vehicles; Automotive Systems, V001T03A005, October 11–13, 2017
Publisher: American Society of Mechanical Engineers
Paper No: DSCC2017-5343
https://doi.org/10.1115/DSCC2017-5343
View Paper titled, Proxy-Based Optimal Dynamic Control Allocation for Multi-Input, Multi-Output Over-Actuated Systems
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Topics: Energy efficiency, Optimization, Simulation
Journal Articles

Modeling Complex Nonminimum Phase Zeros in Flexure Mechanisms

Leqing Cui, Chinedum Okwudire, Shorya Awtar
Journal: Journal of Dynamic Systems, Measurement, and Control
Publisher: ASME
Article Type: Research-Article
J. Dyn. Sys., Meas., Control. October 2017, 139(10): 101001.
Paper No: DS-16-1343
https://doi.org/10.1115/1.4036032
Published Online: June 5, 2017
View Article titled, Modeling Complex Nonminimum Phase Zeros in Flexure Mechanisms
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Topics: Bending (Stress), Displacement, Flexure mechanisms, Modeling, Design, Kinematics, Transfer functions
Proceedings Papers

Near Energy Optimal Control Allocation for Dual-Input Over-Actuated Systems

Molong Duan, Chinedum Okwudire
Proc. ASME. DSCC2016, Volume 1: Advances in Control Design Methods, Nonlinear and Optimal Control, Robotics, and Wind Energy Systems; Aerospace Applications; Assistive and Rehabilitation Robotics; Assistive Robotics; Battery and Oil and Gas Systems; Bioengineering Applications; Biomedical and Neural Systems Modeling, Diagnostics and Healthcare; Control and Monitoring of Vibratory Systems; Diagnostics and Detection; Energy Harvesting; Estimation and Identification; Fuel Cells/Energy Storage; Intelligent Transportation, V001T01A011, October 12–14, 2016
Publisher: American Society of Mechanical Engineers
Paper No: DSCC2016-9905
https://doi.org/10.1115/DSCC2016-9905
View Paper titled, Near Energy Optimal Control Allocation for Dual-Input Over-Actuated Systems
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Topics: Optimal control, Control equipment, Approximation, Computation, Energy efficiency, Engineering simulation, Optimization, Simulation
Proceedings Papers

Complex Non-Minimum Phase Zeros in the Dynamics of Double Parallelogram Flexure Module Based Flexure Mechanisms

Leqing Cui, Chinedum Okwudire, Shorya Awtar
Proc. ASME. DSCC2016, Volume 2: Mechatronics; Mechatronics and Controls in Advanced Manufacturing; Modeling and Control of Automotive Systems and Combustion Engines; Modeling and Validation; Motion and Vibration Control Applications; Multi-Agent and Networked Systems; Path Planning and Motion Control; Robot Manipulators; Sensors and Actuators; Tracking Control Systems; Uncertain Systems and Robustness; Unmanned, Ground and Surface Robotics; Vehicle Dynamic Controls; Vehicle Dynamics and Traffic Control, V002T17A002, October 12–14, 2016
Publisher: American Society of Mechanical Engineers
Paper No: DSCC2016-9658
https://doi.org/10.1115/DSCC2016-9658
View Paper titled, Complex Non-Minimum Phase Zeros in the Dynamics of Double Parallelogram Flexure Module Based Flexure Mechanisms
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Topics: Bending (Stress), Dynamics (Mechanics), Flexure mechanisms, Displacement, Design, Eigenvalues, Blocks (Building materials), Frequency response, Kinematics, Manufacturing
Proceedings Papers

Effects of Non-Proportional Damping on the Residual Vibrations of Mode-Coupled Ultra-Precision Manufacturing Machines

Jihyun Lee, Chinedum Okwudire
Proc. ASME. DSCC2014, Volume 3: Industrial Applications; Modeling for Oil and Gas, Control and Validation, Estimation, and Control of Automotive Systems; Multi-Agent and Networked Systems; Control System Design; Physical Human-Robot Interaction; Rehabilitation Robotics; Sensing and Actuation for Control; Biomedical Systems; Time Delay Systems and Stability; Unmanned Ground and Surface Robotics; Vehicle Motion Controls; Vibration Analysis and Isolation; Vibration and Control for Energy Harvesting; Wind Energy, V003T50A001, October 22–24, 2014
Publisher: American Society of Mechanical Engineers
Paper No: DSCC2014-6120
https://doi.org/10.1115/DSCC2014-6120
View Paper titled, Effects of Non-Proportional Damping on the Residual Vibrations of Mode-Coupled Ultra-Precision Manufacturing Machines
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Topics: Damping, Machinery, Manufacturing, Vibration, Design, Finishes
Journal Articles

Minimum Tracking Error Control of Flexible Ball Screw Drives Using a Discrete-Time Sliding Mode Controller

Chinedum Okwudire, Yusuf Altintas
Journal: Journal of Dynamic Systems, Measurement, and Control
Publisher: ASME
Article Type: Research Papers
J. Dyn. Sys., Meas., Control. September 2009, 131(5): 051006.
https://doi.org/10.1115/1.3155005
Published Online: August 18, 2009
View Article titled, Minimum Tracking Error Control of Flexible Ball Screw Drives Using a Discrete-Time Sliding Mode Controller
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Topics: Control equipment, Design, Dynamics (Mechanics), Errors, Screws, Engines, Filters