Assistant Professor, University of Connecticut

Research Interest


Theory and practice of dynamic systems and controls, with applications to additive and advanced manufacturing, agile robots, mechatronics, systems of systems, precision engineering, and human-machine collaboration.

Academic Appointments


University of Connecticut, CT, USA

Assistant Professor, Department of Mechanical Engineering (primary affiliation), 08/2014-Present

Assistant Professor, The Institute of Materials Science, 04/2015-Present

Assistant Professor, UTC Institute for Advanced Systems Engineering, 08/2015-Present

University of California, Berkeley, CA, USA

Lecturer, Department of Mechanical Engineering , 07/2013-06/2014

Quick link to UC Berkeley Advanced Control Systems Course (Youtube, iTunes U, Berkeley webcast).

Contact

191 Auditorium Road, Unit 3139

United Technology Engineer Building, Rm. 382

Storrs, CT 06269-3139, USA
        
Email: xchen[AT]uconn.edu
        
Phone: (860) 486-3688

Education


University of California, Berkeley, CA, USA

Ph.D. in Mechanical Engineering, 12/2013

Major: Controls

Minors: Optimization; Digital signal processing; Statistics

Committee: Masayoshi Tomizuka (advisor), Roberto Horowitz, Andrew Packard, Murat Arcak

University of California, Berkeley, CA, USA

M.S. in Mechanical Engineering, 05/2010

Committee: Masayoshi Tomizuka (advisor), J. Karl Hedrick

Tsinghua University (outstanding college graduate, outstanding thesis), Beijing, China

Bachelor in Mechanical Engineering, 07/2008

Hong Kong University of Science and Technology, Hong Kong, China

Exchange Student in Mechanical Engineering, 08/2006-12/2006

Recognitions


UTC Institute for Advanced Systems Engineering Breakthrough Award, 2016

UConn University Teaching Fellow Award Nominee, 2017

Teaching Excellence Recognition by Office of the Provost, UConn, 2016

Young Investigator Award, ISCIE/ASME International Symposium on Flexible Automation, 2014

Best Paper Finalist, ISCIE/ASME International Symposium on Flexible Automation, 2014

Clyde Johnson Fellowship, UC Berkeley, 2013

F. M. Lankershim Fellowship, UC Berkeley, 2013

Chinese Government Award for Outstanding Self-financed Students Abroad, 2012

Outstanding Graduate Student Instructor, UC Berkeley, 2012

ASME ISPS Division Graduate Student Conference Scholarship, 2012

Frank and Margaret Lucas Fellowship, UC Berkeley, 2011

Outstanding College Graduate of Tsinghua University, 2008

Outstanding Undergraduate Thesis of Tsinghua University, 2008

Jiangxi Province Outstanding Students Scholarship, 2004-2008

China Construction Bank Scholarship for Academic Excellence, 2006

Eminent award: “Ethical Leadership for the New Generation” Training Programme-Case Study Competition, Hong Kong Independent Committee Against Corruption, 2006

Gold Medal for Beijing College Student Physics Competition, 2005

Tsinghua Alumni - Xu Shunshou 1st honor Scholarship, 2005

Professional Activities


Students and Young Members Chair, ASME Dynamic Systems and Control Conference, 2016

Newsletter Editor, ASME DSCD, Fall 2016-Present

Newsletter Associate Editor, ASME Dynamic Systems and Control Division (DSCD), Fall 2015-Fall 2016

Secretary for Vibration Technical Committee, ASME DSCD, Fall 2015-Present

Conference Organizing Committee

ASME Dynamic Systems and Control Conference, 2016

Conference Program Committee and Editorial Board

IEEE/ASME International Conference on Advanced Intelligent Mechatronics, 2017

ASME Dynamic Systems and Control Conference, 2014, 2016

ISCIE/ASME International Symposium on Flexible Automation (ISFA), 2016

International Conference on Complex Systems Engineering, 2015

Grant Proposal Reviews

Ad-hoc Proposal Reviewer, US Department of Defense, 2017

Ad-hoc Proposal Reviewer, National Science Foundation, 2017

Proposal Review Panelist, National Science Foundation CMMI, 2015

Ad-hoc Proposal Reviewer, Kentucky Science and Engineering Foundation, 2014

Ad-hoc Proposal Reviewer, Netherlands Organisation for Scientific Research, 2016

Associate Editor

IEEE International Conference on Advanced Intelligent Mechatronics, 2016

IEEE American Control Conference, 2015-2017

ISCIE/ASME International Symposium on Flexible Automation (ISFA), 2016

ASME Dynamic Systems and Control Conference, 2014-2016

Research


  • Selected Current Research: mechatronics and controls in additive manufacturing, data-driven modeling and controls, precision control and vibration rejection, transient control, human-machine interactions, robotics.

  • Selected Past Projects: wafer scanners (semiconductor manufacturing system), active suspensions, hard disk drives (nanometer-scale precision system), electrical power steering (transportation system), spacecraft attitude control, human-machine interactions, networked control, material processing.

  • Theories and Algorithms: adaptive control, data-driven modeling, optimization-based control, system identification, learning control and robust control, loop shaping, mechatronics, delay compensation.

Selected Journal Publications

  1. X. Chen, T. Jiang, and M. Tomizuka. “Pseudo Youla-Kucera Parameterization with Control of the Waterbed Effect for Local Loop Shaping”. In: Automatica 62 (2015), pp. 177–183. doi: 10.1016/j.automatica.2015.09.029.
  2. X. Chen and H. Xiao. “Multirate Forward-model Disturbance Observer for Feedback Regulation beyond Nyquist Frequency”. In: Systems & Control Letters 94 (Aug. 2016), pp. 181–188. doi: 10.1016/j.sysconle.2016.06.011.
  3. A. C. Silva, I. D. Landau, L. Dugard, and X. Chen. “Modified direct adaptive regulation scheme applied to a benchmark problem”. In: European Journal of Control 28 (2016), pp. 69–78. issn: 0947-3580. doi: http://dx.doi.org/10.1016/j.ejcon.2015.12.006.
  4. X. Chen and M. Tomizuka. “Discrete-time Reduced-Complexity Youla Parameterization for Dual-input Single-output Systems”. In: IEEE Transactions on Control Systems Technology 24.1 (2016), pp. 302–309. doi: 10.1109/TCST.2015.2422796.
  5. X. Chen and M. Tomizuka. “Overview and New Results in Disturbance Observer based Adaptive Vibration Rejection With Application to Advanced Manufacturing”. In: International Journal of Adaptive Control and Signal Processing 29 (2015), pp. 1459–1474. issn: 1099-1115. doi: 10.1002/acs.2546.
  6. X. Chen and M. Tomizuka. “New Repetitive Control With Improved Steady-State Performance and Accelerated Transient”. In: IEEE Transactions on Control Systems Technology 22.2 (Mar. 2014), pp. 664– 675. issn: 1063-6536. doi: 10.1109/TCST.2013.2253102.
  7. X. Chen and M. Tomizuka. “A Minimum Parameter Adaptive Approach for Rejecting Multiple Narrow- band Disturbances With Application to Hard Disk Drives”. In: IEEE Transactions on Control Systems Technology 20.2 (Mar. 2012), pp. 408–415. issn: 1063-6536. doi: 10.1109/TCST.2011.2178025.
  8. X. Chen and M. Tomizuka. “Optimal Decoupled Disturbance Observers for Dual-input Single-output Systems”. In: ASME Journal of Dynamic Systems, Measurement, and Control 136.5 (2014), p. 051018. doi: 10.1115/1.4027282.
  9. X. Chen and M. Tomizuka. “Selective Model Inversion and Adaptive Disturbance Observer for Time- varying Vibration Rejection on an Active-suspension Benchmark”. In: European Journal of Control 19.4 (2013). [Related summary and comparison paper: http://dx.doi.org/10.1016/j.ejcon.2013. 05.007 ], pp. 300–312. issn: 0947-3580. doi: 10.1016/j.ejcon.2013.04.002.

Industrial Experience


  • Senior Research Intern at Western Digital Corporation, Irvine, California, 06/2013-06/2013

  • Research Intern at Western Digital Corporation, Irvine, California, 05/2012-07/2012

  • Research Intern at Western Digital Corporation, Irvine, California, 05/2011-08/2011

  • Research Intern at Western Digital Corporation, San Jose, California, 06/2010-07/2010

  • Intern at YuChai Engineering Machinery Corporation, GuangXi, China, 06/2005-06/2005

Patents


  1. Xu Chen, Wei Xi, Young-Hoon Kim, and Kuang-Yang Tu. “Methods for closed-loop compensation of ultra-high frequency disturbances in hard disk drives and hard disk drives utilizing same,” U.S. patent US8630059, January 14, 2014.

  2. Xu Chen, Jianguo Zhou, Wei Xi, Kuang-Yang Tu, and Guoxiao Guo, “Disk drive filtering disturbance signal and error signal for adaptive feed-forward compensation,” U.S. patent US8922938, December 30, 2014.

  3. Minghui Zheng, Xu Chen, Haiming Wang, Young-Hoon Kim, Wei Xi, and Kuang-Yang Tu, “Data storage device comprising slew rate anti-windup compensation for microactuator,” U.S. patent US9007714, April 14, 2015.

  4. Minghui Zheng, Xu Chen, Masayoshi Tomizuka, Wei Xi, Guoxiao Guo, “Data storage devices and methods with frequency-shaped sliding mode control,” U.S. patent pending, filed August 17, 2015.

Invited Talks/Visits


  1. “Mechatronics and Adaptive Local Loop Shaping for Advanced Manufacturing and Beyond,” GE Power, Windsor, CT, Apr. 28, 2016

  2. Technical Discussion, UTRC/UConn Workshop, East Hartford, CT, Apr. 22, 2016

  3. “From Additive Manufacturing to Precision and Adaptive Control,” in IMS Industrial Affiliates Program, Storrs, CT, May 25, 2016

  4. “Control-related Research Opportunities in Additive Manufacturing,” in UCONN Additive Manufacturing Research Cluster Meeting, Storrs, CT, Nov. 14, 2014

  5. “Motion Control, Precision Mechatronics, and Robotics in Advanced Manufacturing,” in NSF US-Korea Workshop on Collaboration in Advanced Manufacturing Research, Reno, Nevada, Aug. 11-12, 2014

  6. “A Loop-Shaping Approach for Precision Control and Adaptive Disturbance Rejection,” at the University of California, San Diego, Aug. 26, 2013

  7. “Anti-windup Design for Saturation Protection,” at Western Digital Co., Irvine, CA, Jun. 2013

  8. “Vibration Rejection in Precision Systems—An Adaptive Band-limited Loop-shaping Control Approach,” in Mechanical Engineering External Advisory Board Meeting, UC Berkeley, Dec. 08, 2011

  9. “Unknown Multiple Narrow-band Disturbance Rejection—An Overview,” at Western Digital Co., San Jose, CA, Jun. 2010