Publications

Xiaohai Hu, Aparajit Venkatesh, Yusen Wan, Guiliang Zheng, Neel Anand Jawale, Navneet Kaur, Xu Chen, Paul Birkmeyer (2024). Learning to Detect Slip through Tactile Estimation of the Contact Force Field and its Entropy Properties. Mechatronics.

Melody Mojib, Kaan Fero, Nicole Atmadja, Dwayne Arola, Xu Chen, Mamidala Ramulu (2024). Effect of Intra-Build Design Parameters on the Fracture Toughness Properties of EBM Ti6Al4V. Fatigue and Fracture of Engineering Materials and Structures.

Arun Nandagopal, Abhishek Kulkarni, Colin Acton, Krithika Manohar, Xu Chen (2024). Agile Surface Inspection Framework for Aerospace Components Using Unsupervised Machine Learning. Proceedings of ASME/ISCIE International Symposium on Flexible Automation.

Xiaohai Hu, Thomas Chu, Xu Chen (2024). State-Space System Identification beyond the Nyquist Frequency with Collaborative Non-Uniform Sensing Data. Proceedings of IEEE American Control Conference.

Thomas Chu, Xiaohai Hu, Xu Chen (2024). Optimal Loop Shaping and Disturbance Rejection Beyond the Nyquist Frequency using a Forward Model Disturbance Observer and Convex Optimization Based Filter Design. IEEE American Control Conference.

Xiaohai Hu, Aprajit Venkatesh, Yusen Wan, Guiliang Zheng, Neel Anand Jawale, Navneet Kaur, Xu Chen, Paul Birkmeyer (2024). Learning to Detect Slip through Tactile Measures of the Contact Force Field and its Entropy. Mechatronics.

Neel Anand Jawale, Navneet Kaur, Elizabeth Amy Santoso, Xiaohai Hu, Xu Chen (2024). Learned Slip-Detection-Severity Framework using Tactile Deformation Field Feedback for Robotic Manipulation. IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS).

Jiong Tang, Soichi Ibaraki, Xu Chen, Haruhiko Suwa, Masayoshi Tomizuka, Toshiya Kaihara (2024). ISFA 2024: Proceedings of 2024 ISCIE/ASME International Symposium on Flexible Automation. 2024 ISCIE/ASME International Symposium on Flexible Automation.

Tomoyuki Shimono, Xu Chen, Hiroshi Fujimoto, Xiang Chen (2024). AIM 2024: Proceedings of 2024 IEEE/ASME International Conference on Advanced Intelligent Mechatronics. 2024 IEEE/ASME International Conference on Advanced Intelligent Mechatronics.

Arun Nandagopal, Jonas Beachy, Colin Acton, Xu Chen (2024). A Robotic Surface Inspection Framework and Machine-Learning Based Optimal Segmentation For Aerospace and Precision Manufacturing. Journal of Manufacturing Processes.

Xu Chen, Masayoshi Tomizuka (2023). Introduction to Modern Controls – with Illustrations in MATLAB and Python.

Dan Wang, Xu Chen (2023). Multi-Track Melt Pool Width Modeling in Powder Bed Fusion Additive Manufacturing. ASME Letters in Dynamic Systems and Control.

Dan Wang, Xu Chen (2023). Control-oriented Modeling and Multirate Feedback Control in Laser Powder Bed Fusion Additive Manufacturing. 2023 Modeling, Estimation, and Control Conference.

Colin Acton, SangYoon Back, Norawish Lohitnavy, Arun Nandagopal, Xu Chen (2023). Collaborative Robotics, Controls, and Machine Learning for Automated Visual Inspection of Complex Parts and Surfaces. 3rd Modeling, Estimation, and Control Conference (MECC).

Jinhua Ouyang, Xu Chen (2023). A Recursive System Identification With Non-Uniform Temporal Feedback Under Coprime Collaborative Sensing. ASME Letters in Dynamic Systems and Control.

Jinhua Ouyang, Xu Chen (2023). A Recursive System Identification with Non-uniform Data under Coprime Collaborative Sensing. 2023 Modeling, Estimation, and Control Conference.

Qiyao Gao, Xiaoyang Sun, Zhitao Yu, Xu Chen (2023). Understanding and Controlling the Sensitivity of Event Cameras in Responding to Static Objects. IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM).

Jinhua Ouyang, Xu Chen (2023). Least Squares Solution for System Identification with Non-uniform Data under a Coprime Collaborative Sensing Scheme. In ACC.

Feifei Yang, Navid Zobeiry, Ramulu Mamidala, Xu Chen (2023). A Review of Aging, Degradation, and Reusability of PA12 Powders in Selective Laser Sintering Additive Manufacturing. Materials Today Communications.

Tianyu Jiang, Mengying Leng, Xu Chen (2023). Preheating Temperature Control and Low-Contrast Imaging Data Analytics for Laser Powder Bed Fusion. IEEE/ASME Transactions on Mechatronics.

Mohammad Sayem Bin Abdullah, Eric Bol, Garrett Kelley, Curtis Doyle, Rick Schleusener, Melody Mojib, Xu Chen, Dwayne Arola, Mamidala Ramulu (2023). Microstructure and Microhardness of Electron Beam Melted Ti-6Al-4V Components with Differential Thickness in Initial Deposition Layers. Journal of Materials Research and Technology.

Mark Gerges, Xu Chen (2022). Adaptive Lighting for Curved and Nonuniform Objects in Optomechanical Inspection Systems. IEEE/ASME Transactions on Mechatronics.

John Shim, Xu Chen (2022). Control-oriented Modeling and Learning of Fast 3-Dimensional Laser-material Interaction from 2-Dimensional Images. ASTM International Conference on Additive Manufacturing.

Colin Acton, Xiaohai Hu, Mingyu Wang, Xu Chen (2022). A Robotic Chess Player and the Impacts of Mechanical and Environmental Setting in Data Collection. Joint 9th IFAC Symposium on Mechatronic Systems and 16th International Conference on Motion and Vibration Control.

Feifei Yang, Xu Chen (2022). A Mass-Transfer Based Approach to Model and Predict Volatile Organic Compound Emission from Selective Laser Sintering. International Symposium on Flexible Automation 2022.

John Shim, Xu Chen (2022). Learning Of Fast 3-dimensional Laser-material Interaction From 2-dimensional Images. Proceedings of ASME/ISCIE International Symposium on Flexible Automation.

Hui Xiao, Xu Chen (2022). Target Tracking Under Delayed and Irregularly-Sampled Visual Feedback for a Robotic Air-Hockey System. Proceedings of IEEE American Control Conference.

Dan Wang, Xu Chen (2022). Closed-loop Feedback For Additive Manufacturing Simulation.

Caleb Schoenholz, Shuangshan Li, Kyle Bainbridge, Vy Huynh, Alex Gray, Xu Chen, Navid Zobeiry (2022). A Machine Learning-based Portable Inspection Method For Evaluation Of Tool Surface Condition And Release Coating In Composites Manufacturing. SAMPE Conference Proceedings, Society for the Advancement of Material and Process Engineering - North America.

Tianyu Jiang, Mengying Leng, Xu Chen (2022). Method for Segmenting Images.

Mark Gerges, Xu Chen (2022). Adaptive Illuminance Control.

Hui Xiao, Xu Chen, Albert Wang, Dylan Sun (2022). Target Tracking Under Delayed and Irregularly-Sampled Visual Feedback for a Robotic Air-Hockey System. Northwest Robotics Symposium.

Mark Gerges, Xu Chen (2022). Shape-Adaptive Lighting for Complex Geometries in Automated Visual Inspection. IFAC-PapersOnLine Proceedings of 2nd Modeling, Estimation and Control Conference (MECC) 2022.

Tianyu Jiang, Mengying Leng, Xu Chen (2022). Control-oriented In-situ Imaging and Data Analytics for Coaxial Monitoring of Powder Bed Fusion Additive Manufacturing. Progress in Additive Manufacturing 2020.

Jason Xie, Tianyu Jiang, Xu Chen (2022). An Image Segmentation Framework for In-Situ Monitoring in Laser Powder Bed Fusion Additive Manufacturing. IFAC-PapersOnLine Proceedings of 2nd Modeling, Estimation and Control Conference (MECC) 2022.

Feifei Yang, Xu Chen (2022). A New Kinetic Modelling of Polyamide 12 Degradation in Selective Laser Sintering. Progress in Additive Manufacturing 2020.

Feifei Yang, Tianyu Jiang, Xu Chen, Greg Lalier, John Bartolone (2021). A Control of Surface Quality in Selective Laser Sintering Additive Manufacturing With Reclaimed Polyamide Materials. Proceedings of Annual International Solid Freeform Fabrication Symposium.

Feifei Yang, Xu Chen (2021). A Combined Theoretical and Experimental Approach to Model Polyamide 12 Degradation in Selective Laser Sintering Additive Manufacturing. Journal of Manufacturing Processes.

Tianyu Jiang, Mengying Leng, Xu Chen (2021). Control-oriented Mechatronic Design and Data Analytics for Quality-assured Powder Bed Fusion Additive Manufacturing. IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM).

Mark Gerges (2021). Provision of Controlled and Consistent Light Distribution Over an Uneven Topography to Maximize Efficacy of Machine-Vision based Defect Identification.

Tianyu Jiang, Xu Chen, Mengying Leng (2021). System and Method for Defect Detection in Laser Powder Bed Fusion Additive Manufacturing.

Mark Gerges, Xu Chen (2021). Adaptive Illuminance Control of Uniform and Uneven Topographies.

Dan Wang, Xinyu Zhao, Xu Chen (2021). New Hammerstein Modeling and Analysis for Controlling Melt Pool Width in Powder Bed Fusion Additive Manufacturing. ASME Letters in Dynamic Systems and Control.

Feifei Yang, Angela Schnuerch, Xu Chen (2021). Quantitative Influences of Successive Reuse on Thermal Decomposition, Molecular Evolution and Elemental Composition of Polyamide 12 Residues in Selective Laser Sintering. International Journal of Advanced Manufacturing Technology.

Feifei Yang, Tianyu Jiang, Greg Lalier, John Bartolone, Xu Chen (2021). Process Control of Surface Quality and Part Microstructure in Selective Laser Sintering Involving Highly Degraded Polyamide 12 Materials. Polymer Testing.

Mark Gerges, Xu Chen (2021). Modeling and Closed-Loop Control of Lights for Consistent and Robotic Inspection of Complex Metallic Parts.

Akanksha Patel, Varun Venoor, Feifei Yang, Xu Chen, Margaret J. Sobkowicz (2021). Evaluating Poly (Ether Ether Ketone) Powder Recyclability for Selective Laser Sintering Applications. Polymer Degradation and Stability.

Dan Wang, Tianyu Jiang, Xu Chen (2021). Control-Oriented Modeling and Repetitive Control of In-Layer and Cross-Layer Thermal Interactions in Selective Laser Sintering. ASME Letters in Dynamic Systems and Control.

Jiong Tang, Xu Chen, Yan Gu, Minghui Zheng (2020). Focused Section on Machine Learning, Estimation and Control for Intelligent Robotics.

Tianyu Jiang, Hui Xiao, Jiong Tang, Liting Sun, Xu Chen (2020). Local Loop Shaping for Rejecting Band-Limited Disturbances in Nonminimum-phase Systems with Application to Laser Beam Steering for Additive Manufacturing. IEEE Transactions on Control Systems Technology.

Dan Wang, Xu Chen (2020). Closed-loop Feedback For Additive Manufacturing Simulation.

Tianyu Jiang, Xu Chen (2020). An In-situ Imaging and Data Analytics for Selective Laser Sintering in Presence of System Degradation. ASTM International Conference on Additive Manufacturing.

Feifei Yang, Xu Chen (2020). A New Kinetic Modelling of Polyamide 12 Degradation in Selective Laser Sintering. ASTM International Conference on Additive Manufacturing.

Dan Wang, Xinyu Zhao, Xu Chen (2020). New Hammerstein Modeling and Analysis for Controlling Melt Pool Width in Powder Bed Fusion Additive Manufacturing. Proceedings of ASME Dynamic Systems and Control Conference.

Dan Wang, Xu Chen (2020). Closed-loop High-fidelity Simulation Integrating Finite Element Modeling with Feedback Controls in Additive Manufacturing. ASME Journal of Dynamic Systems, Measurement, and Control.

Hui Xiao, Yaakov Bar-Shalom, Xu Chen (2020). A Collaborative Sensing and Model-based Realtime Recovery of Fast Temporal Flows from Sparse Measurements. IEEE Transactions on Industrial Electronics.

Dan Wang, Xu Chen (2020). Closed-loop Simulation Integrating Finite Element Modeling with Feedback Controls in Powder Bed Fusion Additive Manufacturing. Proceedings of ASME/ISCIE International Symposium on Flexible Automation.

Feifei Yang, Tianyu Jiang, Greg Lalier, John Bartolone, Xu Chen (2020). Active Interlayer Heating for Sustainable Selective Laser Sintering With Reclaimed Polyamide 12 Powders. Proceedings of ASME/ISCIE International Symposium on Flexible Automation.

Navid Zobeiry, Charles Seaton, Marco Salviato, Xu Chen, Ashis Banerjee, Santosh Devasia, Jihui Yang, Agnes Blom-Schieber, James Buttrick, Samuel Pedigo (2020). A Factory-Centric Workforce Development Approach for Aerospace Industry. SAMPE Conference Proceedings, Society for the Advancement of Material and Process Engineering - North America.

Dan Wang, Xu Chen (2020). H-infinity-based Selective Inversion of Nonminimum-phase Systems for Feedback Controls. IEEE/CAA Journal of Automatica Sinica.

Hui Xiao, Xu Chen (2020). Robotic Target Following with Slow and Delayed Visual Feedback. International Journal of Intelligent Robotics and Applications.

Yuan Yuan, Xu Chen, Jiong Tang (2020). Multivariable Robust Blade Pitch Control Design to Reject Periodic Loads on Wind Turbines. Renewable Energy.

Jiong Tang, Xu Chen, Yan Gu, Minghui Zheng (2020). Introduction to the Focused Section on Machine Learning, Estimation and Control for Intelligent Robotics. International Journal of Intelligent Robotics and Applications.

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Feifei Yang, Tianyu Jiang, Greg Lalier, John Bartolone, Xu Chen (2020). A Process Control and Interlayer Heating Approach to Reuse Polyamide 12 Powders and Create Parts With Improved Mechanical Properties in Selective Laser Sintering. Journal of Manufacturing Processes.

Dan Wang, Xu Chen (2019). Closed-loop High-fidelity Simulation Integrating Finite Element Modeling with Feedback Controls in Additive Manufacturing.

Hui Xiao, Xu Chen (2019). Following Fast-Dynamic Targets With Only Slow and Delayed Visual Feedback - a Kalman Filter and Model-Based Prediction Approach. Proceedings of ASME Dynamic Systems and Control Conference.

Dan Wang, Tianyu Jiang, Xu Chen (2019). Control-Oriented Modeling and Repetitive Control of In-Layer and Cross-Layer Thermal Interactions in Selective Laser Sintering. Proceedings of ASME Dynamic Systems and Control Conference.

Hui Xiao, Xu Chen (2019). A Dynamic Target Tracking Under Slow and Delayed Vision Feedback. Joint 12th IFAC Conference on Control Applications in Marine Systems, Robotics, and Vehicles 1st IFAC Workshop on Robot Control.

Tianyu Jiang, Jiong Tang, Xu Chen (2018). Wide-band Loop Shaping for Modulation of Energy Transmission in Nonminimum-phase Systems. Proceedings of ASME Dynamic Systems and Control Conference.

Hui Xiao, Yaakov Bar-Shalom, Xu Chen (2018). Model-based Sparse Information Recovery by Collaborative Sensor Management. Proceedings of ASME Dynamic Systems and Control Conference.

Dan Wang, Xu Chen (2018). Synthesis and Analysis of Multirate Repetitive Control for Fractional-order Periodic Disturbance Rejection in Powder Bed Fusion. Proceedings of ASME/ISCIE International Symposium on Flexible Automation.

Dan Wang, Xu Chen (2018). A Multirate Repetitive Control for Fractional-Order Servos in Laser-Based Additive Manufacturing. Proceedings of IEEE American Control Conference.

Dan Wang, Xu Chen (2018). A Spectral Analysis and Its Implications of Feedback Regulation beyond Nyquist Frequency. IEEE/ASME Transactions on Mechatronics.

Tianyu Jiang, Xu Chen (2018). Transmission of Signal Nonsmoothness and Transient Improvement in Add-On Servo Control. IEEE Transactions on Control Systems Technology.

Yuan Yuan, Xu Chen, Jiong Tang (2018). Periodic Wind Disturbance Rejection using Robust Individual Pitch Control. Proceedings of SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

Hui Xiao, Tianyu Jiang, Xu Chen (2018). Rejecting Fast Narrow-Band Disturbances With Slow Sensor Feedback for Quality Beam Steering in Selective Laser Sintering. Mechatronics.

Xu Chen, Tianyu Jiang, Dan Wang, Hui Xiao (2018). Realtime Control-Oriented Modeling and Disturbance Parameterization for Smart and Reliable Powder Bed Fusion Additive Manufacturing. Proceedings of Annual International Solid Freeform Fabrication Symposium.

Wonhee Kim, Xu Chen, Youngwoo Lee, Chung Choo Chung, Masayoshi Tomizuka (2018). Discrete-Time Nonlinear Damping Backstepping Control With Observers for Rejection of Low and High Frequency Disturbances. Mechanical Systems and Signal Processing.

Dan Wang, Xu Chen (2018). A Multirate Fractional-Order Repetitive Control for Laser-Aided Additive Manufacturing. Control Engineering Practice.

Shiying Zhou, Xu Chen, Minghui Zheng, Masayoshi Tomizuka (2017). Control of Dual-stage HDDs with Enhanced Repetitive Disturbance Rejection. Proceedings of ASME Information Storage and Processing Systems Conference, San Francisco, CA.

Yuan Yuan, Xu Chen, Jiong Tang (2017). Disturbance Observer Based Pitch Control of Wind Turbines for Enhanced Speed Regulation. ASME Journal of Dynamic Systems, Measurement, and Control.

Liting Sun, Tianyu Jiang, Xu Chen (2017). Adaptive Loop Shaping for Wideband Disturbances Attenuation in Precision Information Storage Systems. IEEE Transactions on Magnetics.

Hui Xiao, Xu Chen (2017). Multi-band beyond-Nyquist Disturbance Rejection on a Galvanometer Scanner System. Proceedings of IEEE International Conference on Advanced Intelligent Mechatronics, July 3-7 2017, Munich, Germany.

Minghui Zheng, Masayoshi Tomizuka, Xu Chen, Wei Xi, Guoxiao Guo (2017). Data Storage Devices and Methods with Frequency-Shaped Sliding Mode Control. Google Patents.

Tianyu Jiang, Hui Xiao, Xu Chen (2017). An Inverse-Free Disturbance Observer for Adaptive Narrow-Band Disturbance Rejection With Application to Selective Laser Sintering. Proceedings of ASME Dynamic Systems and Control Conference.

Dan Wang, Xu Chen (2017). A Tutorial on Loop-shaping Control Methodologies for Precision Positioning Systems. Advances in Mechanical Engineering.

Hui Xiao, Ioan D. Landau, Xu Chen (2017). A Robust Optimal Design for Strictly Positive Realness in Recursive Parameter Adaptation. International Journal of Adaptive Control and Signal Processing.

Yuan Yuan, Xu Chen, Jiong Tang (2016). Disturbance Observer Based Control Design for Wind Turbine Speed Regulation. Proceedings of ASME Dynamic Systems and Control Conference.

Dan Wang, Masayoshi Tomizuka, Xu Chen (2016). Spectral Distribution and Implications of Feedback Regulation beyond Nyquist Frequency. Proceedings of ASME/ISCIE International Symposium on Flexible Automation.

Xu Chen, Hui Xiao (2016). Multirate Forward-model Disturbance Observer for Feedback Regulation beyond Nyquist Frequency. Systems & Control Letters.

Xu Chen, Hui Xiao (2016). Multirate Forward-model Disturbance Observer for Feedback Regulation beyond Nyquist Frequency. Proceedings of IEEE American Control Conference.

Tianyu Jiang, Paul Hanrahan, Xu Chen (2016). Input-to-output Discontinuity and Transient Improvement in Add-on Control Design. Proceedings of IEEE American Control Conference.

Minghui Zheng, Xu Chen, Masayoshi Tomizuka (2016). Extended State Observer with Phase Compensation to Deal with High-frequency Vibrations in Hard Disk Drives. Proceedings of IEEE American Control Conference.

Liting Sun, Xu Chen, Masayoshi Tomizuka (2016). Enhanced Wide-Spectrum Vibration Suppression Based on Adaptive Loop Shaping. Proceedings of IEEE American Control Conference.

Ioan D. Landau, Abraham Castellanos Silva, Luc Dugard, Xu Chen (2016). Interlaced Direct Adaptive Regulation Scheme Applied to a Benchmark Problem. Proceedings of Mediterranean Conference on Control and Automation.

Yuan Yuan, Xu Chen, Jiong Tang (2016). Disturbance Observer Based Pitch Control of Wind Turbines for Disturbance Rejection. Proceedings of SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

Abraham Castellanos Silva, Ioan D. Landau, Luc Dugard, Xu Chen (2016). Modified Direct Adaptive Regulation Scheme Applied to a Benchmark Problem. European Journal of Control.

Xu Chen, Masayoshi Tomizuka (2016). Discrete-time Reduced-Complexity Youla Parameterization for Dual-input Single-output Systems. IEEE Transactions on Control Systems Technology.

Tianyu Jiang, Xu Chen (2015). An Open-source Selective Laser Sintering Additive Manufacturing System. International Conference on Complex Systems Engineering.

Wenlong Zhang, Xu Chen, Joonbum Bae, Masayoshi Tomizuka (2015). Real-time Kinematic Modeling and Prediction of Human Joint Motion in a Networked Rehabilitation System. Proceedings of IEEE American Control Conference.

Wonhee Kim, Xu Chen, Chung Choo Chung, Masayoshi Tomizuka (2015). Discrete-time Output Feedback Nonlinear Control for Combined Low- and High-frequency Disturbance Compensation. Proceedings of IEEE American Control Conference.

Minghui Zheng, Xu Chen, Haiming Wang, Young-Hoon Kim, Wei Xi, Kuang-Yang Tu (2015). Data Storage Device Comprising Slew Rate Anti-Windup Compensation for Microactuator. Google Patents.

Xu Chen, Tianyu Jiang, Masayoshi Tomizuka (2015). Pseudo Youla-Kucera Parameterization with Control of the Waterbed Effect for Local Loop Shaping. Automatica.

Xu Chen, Masayoshi Tomizuka (2015). Overview and New Results in Disturbance Observer based Adaptive Vibration Rejection with Application to Advanced Manufacturing. International Journal of Adaptive Control and Signal Processing.

Xu Chen, Jianguo Zhou, Wei Xi, Kuang-Yang Tu, Guoxiao Guo (2014). Disk Drive Filtering Disturbance Signal and Error Signal for Adaptive Feed-Forward Compensation.

Liting Sun, Xu Chen, Masayoshi Tomizuka (2014). Adaptive Suppression of High-Frequency Wide-Spectrum Vibrations With Application to Disk Drive Systems. Proceedings of 2014 ASME Dynamic Systems and Control Conference.

Yizhou Wang, Xu Chen, Masayoshi Tomizuka (2014). Adaptive Sliding Mode Spacecraft Attitude Control. Proceedings of 2014 ASME Dynamic Systems and Control Conference.

Xu Chen, Masayoshi Tomizuka (2014). Transient Enhancement in Add-On Feedforward Algorithms for High-Performance Mechatronic Systems. Proceedings of the 19th World Congress of the International Federation of Automatic Control.

Minghui Zheng, Xu Chen, Masayoshi Tomizuka (2014). Discrete-Time Frequency-Shaped Sliding Mode Control for Audio-Vibration Rejection in Hard Disk Drives. Proceedings of the 19th World Congress of the International Federation of Automatic Control.

Liting Sun, Xu Chen, Masayoshi Tomizuka (2014). Selective Iterative Learning Control to Deal With Iteration-Dependent Disturbances. Proceedings of ISCIE/ASME International Symposium on Flexible Automation.

Minghui Zheng, Xu Chen, Masayoshi Tomizuka (2014). A Nonlinear Feedback Control Scheme for Transient Performance Enhancement in Hard Disk Drives. Proceedings of ASME Annual Conference on Information Storage & Processing Systems.

Xu Chen, Masayoshi Tomizuka (2014). New Repetitive Control with Improved Steady-State Performance and Accelerated Transient. IEEE Transactions on Control Systems Technology.

Xu Chen, Masayoshi Tomizuka (2014). Optimal Decoupled Disturbance Observers for Dual-Input Single-Output Systems. ASME Journal of Dynamic Systems, Measurement, and Control.

Xu Chen, Wei Xi, Young-Hoon Kim, Kuang-Yang Tu (2014). Methods for Closed-loop Compensation of Ultra-high Frequency Disturbances in Hard Disk Drives and Hard Disk Drives Utilizing Same. US Patent 8,630,059.

Atsushi Oshima, Xu Chen, Sumio Sugita, Masayoshi Tomizuka (2013). Control Design for Cancellation of Unnatural Reaction Torque and Vibrations in Variable-Gear-Ratio Steering System. Proceedings of ASME Dynamic Systems and Control Conference.

Xu Chen, Masayoshi Tomizuka (2013). Selective Model Inversion and Adaptive Disturbance Observer for Rejection of Time-varying Vibrations on an Active Suspension. Proceedings of European Control Conference, Zurich, Switzerland.

Xu Chen, Masayoshi Tomizuka (2013). Reduced-Complexity and Robust Youla Parameterization for Discrete-Time Dual-Input-Single-Output Systems. Proceedings of IEEE/ASME International Conference on Advanced Intelligent Mechatronics.

Liting Sun, Xu Chen, Masayoshi Tomizuka (2013). Neural-Network Based Automatic PID Gain Tuning in the Presence of Time-Varying Disturbances in Hard Disk Drives. Proceedings of ASME Information Storage and Processing Systems Conference.

Xu Chen, Masayoshi Tomizuka (2013). Control Methodologies for Precision Positioning Systems. Proceedings of IEEE American Control Conference.

Xu Chen, Atsushi Oshima, Masayoshi Tomizuka (2013). Inverse-Based Local Loop Shaping and IIR-filter Design For Precision Motion Control. Proceedings of the 6th International Federation of Automatic Control Symposium on Mechatronic Systems.

Xu Chen, Masayoshi Tomizuka (2013). Add-on Loop Shaping via Youla Parameterization for Precision Motion Control. Proceedings of American Society for Precision Engineering Spring Topical Meeting and the MIT Laboratory for Manufacturing and Productivity Annual Summit.

Xu Chen, Masayoshi Tomizuka (2013). Selective Model Inversion and Adaptive Disturbance Observer for Time-Varying Vibration Rejection on an Active-Suspension Benchmark. European Journal of Control.

Xu Chen, Masayoshi Tomizuka (2012). Decoupled Disturbance Observers for Dual-Input-Single-Output Systems With Application to Vibration Rejection in Dual-Stage Hard Disk Drives. Proceedings of ASME Dynamic Systems and Control Conference, and 2012 Motion & Vibration Conference.

Xu Chen, Masayoshi Tomizuka (2012). A Convex Optimization Approach for Solving the Robust Strictly Positive Real (SPR) Problem. Proceedings of ASME Dynamic Systems and Control Conference, and 2012 Motion & Vibration Conference.

Xu Chen, Masayoshi Tomizuka (2012). Reduced-complexity Adaptive Youla Parameterization for Broadband-Vibration Rejection in Dual-stage Hard Disk Drives. Proceedings of ASME/JSME Joint International Conference on Micromechatronics for Information and Precision Equipment.

Xu Chen, Masayoshi Tomizuka (2012). An Enhanced Repetitive Control Algorithm using the Structure of Disturbance Observer. Proceedings of IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM).

Xu Chen, Masayoshi Tomizuka (2012). A Minimum Parameter Adaptive Approach for Rejecting Multiple Narrow-Band Disturbances with Application to Hard Disk Drives. IEEE Transactions on Control Systems Technology.

Xu Chen, Masayoshi Tomizuka (2011). Spiral Servo Writing in Hard Disk Drives Using Iterative Learning Based Tracking Control. Proceedings of the 18th World Congress of the International Federation of Automatic Control.

Xu Chen, Masayoshi Tomizuka (2011). A Structure for All Stabilizing Controllers and Its Applications to Narrow-Band Disturbance Rejection in Hard Disk Drives. Proceedings of 21th ASME Annual Conference on Information Storage & Processing Systems.

Xu Chen, Masayoshi Tomizuka (2010). Unknown Multiple Narrow-band Disturbance Rejection in Hard Disk Drives--an Adaptive Notch Filter and Perfect Disturbance Observer Approach. Proceedings of ASME Dynamic Systems and Control Conference.

Xu Chen, Masayoshi Tomizuka (2010). An Indirect Adaptive Approach to Reject Multiple Narrow-Band Disturbances in Hard Disk Drives. Proceedings of International Federation of Automatic Control Symposium on Mechatronic Systems.

Xu Chen, Masayoshi Tomizuka (2010). Optimal Plant Shaping for High Bandwidth Disturbance Rejection in Discrete Disturbance Observers. Proceedings of IEEE American Control Conference.