Control Mechanical Engineering

Xu CHEN

Mechanical Systems Control Laboratory Website: http://www.me.berkeley.edu/~maxchen/

**** ********** ****, ********** ** California, Berkeley Phone: 510-***-****

CA 94720-1740, USA Email: *******@**.********.***

Major: Controls in Mechanical Engineering Gender: Male

Minors: Optimization; Digital signal processing Year of Birth: 1986

EDUCATION University of California, Berkeley (advisor: Masayoshi Tomizuka) California, USA

Ph.D. candidate (major GPA: 4.0/4.0; overall GPA 3.976/4.0) 08/2010-Present

Master of Science (GPA: 4.0/4.0) 05/2010

Beijing, China

Tsinghua University

B.ENG at Mechanical Engineering (GPA: 90.43/100) 07/2008

Hong Kong, China

Hong Kong University of Science and Technology

Exchange Student at Mechanical Engineering (GPA: 4.0/4.0) 08/2006-12/2006

AWARDS Frank and Margaret Lucas Fellowship, UC Berkeley Spring 2011

AND HONORS Department Scholarship for Graduate Study, UC Berkeley Spring 2009

ASME ISPS Division 2012 Graduate Student Conference Scholarship 2012

Excellent College Graduate of Tsinghua University 2008

Excellent Undergraduate Thesis of Tsinghua University 2008

Jiangxi Province Outstanding Students Scholarship (15 awards in the province) 2007

China Construction Bank Scholarship 2006

Dean s List, Hong Kong University of Science and Technology 2006

Gold medal for Beijing College Student Physics Competition 2005

Tsinghua Alumni Xu Shunshou Scholarship (1st class) 2005

1st Prize in Jiangxi Province: The 19th National High School Students Physics Contest 2004

1st Prize in Jiangxi Province: The 19th National High School Students Chemistry Contest 2004

Eminent award: Ethical Leadership for the New Generation Training Programme-Case

2006

Study Competition, Hong Kong Independent Committee Against Corruption

2nd place in preliminary round: The tenth Tsinghua University Business Plan Competition 2007

X. Chen and M. Tomizuka, A Minimum Parameter Adaptive Approach for Rejecting Multiple

SELECTED

Narrow-Band Disturbances with Application to Hard Disk Drives, IEEE Transactions on Control

PUBLICATION

System Technology, vol. 20, no. 2, pp. 408-415, Mar. 2012.

X. Chen and M. Tomizuka, New Repetitive Control with Improved Steady-state Performance and

Accelerated Transient, first version accepted by IEEE Transactions on Control Systems

Technology.

X. Chen and M. Tomizuka, Optimal Plant Shaping for High Bandwidth Disturbance Rejection in

Discrete Disturbance Observers, in Proceedings of the 2010 American Control Conference,

Baltimore, MD, Jun. 30-Jul. 02, 2010, pp. 2641-2646.

X. Chen and M. Tomizuka, An Indirect Adaptive Approach to Reject Multiple Narrow-Band

Disturbances in Hard Disk Drives, in Proceedings of the 2010 IFAC Symposium on Mechatronic

Systems, Cambridge, MA, Sept. 13-Sept. 15, 2010, pp. 44-49.

X. Chen and M. Tomizuka, Unknown Multiple Narrow-Band Disturbance Rejection in Hard Disk

Drives an Adaptive Notch Filter and Perfect Disturbance Observer Approach, in Proceedings of

2010 ASME Dynamic Systems and Control Conference, Cambridge, MA, Sept. 13-Sept. 15, 2010,,

Vol.1, pp. 963-970.

X. Chen and M. Tomizuka, Spiral Servo Writing in Hard Disk Drives Using Iterative Learning

Based Tracking Control, in Proceedings of the 18th World Congress of the International

Federation of Automatic Control (IFAC), Aug. 28-Sept. 2, 2011, Milano, Italy, Vol. 18, Part 1.

X. Chen and M. Tomizuka, A Structure for all Stabilizing Controllers and its Applications to

Narrow-band Disturbance Rejection in Hard Disk Drives, in 21th ASME Annual Conference on

Information Storage & Processing Systems, June 13-14, 2011, SE-A5.

X. Chen and M. Tomizuka, An Enhanced Repetitive Control Algorithm using the Structure of a

Disturbance Observer, in Proceedings of 2012 IEEE/ASME International Conference on

Advanced Intelligent Mechatronics, Taiwan, Jul. 11-14, 2012, pp. 490-495.

X. Chen and M. Tomizuka, A Reduced-complexity Adaptive Youla Parameterization for

Broadband-Vibration Rejection in Dual-stage Hard Disk Drives, 2012 ASME/JSME Joint

International Conference on Micromechatronics for Information and Precision Equipment, Jun.

18-20, 2012, S18_0.

X. Chen and M. Tomizuka, Solving the Robust Strictly Positive Real (SPR) Problem Via Convex

Optimization, in Proceedings of 2012 ASME Dynamic Systems and Control Conference, and 2012

Motion & Vibration Conference, Ft. Lauderdale, FL, Oct. 17-19, 2012, pp. 48-56.

X. Chen and M. Tomizuka, Decoupled Disturbance Observers for Dual-input-single-output

Systems with Application to Vibration Rejection in Dual-stage Hard Disk Drives, in Proceeding of

2012 ASME Dynamic Systems and Control Conference, and 2012 Motion & Vibration Conference,

Ft. Lauderdale, FL, Oct. 17-19, 2012, pp. 1544-1554.

X. Chen and M. Tomizuka, "Optimal Decoupled Disturbance Observers for

dual-input-single-output Systems," under review (journal publication).

X. Chen, Atsushi Oshima, and M. Tomizuka, Inverse Based Local Loop Shaping For Vibration

Rejection In Precision Motion Control, submitted to The 6th IFAC Symposium on Mechatronic

Systems, Hangzhou, China, April 10-12, 2013.

X. Chen, Abraham Castellanos Silva, and M. Tomizuka, Adaptive Model Inversion For Rejection

of Time-varying Vibrations On A Benchmark Problem, submitted to The European Control

Conference 2013, Zurich, Switzerland, July 17-19, 2013.

Two U.S. patents pending (first author).

PATENTS

RESEARCH Graduate Student Researcher at Univ. of California at Berkeley 08/2008-Present

EXPERIENCE RESEARCH PLATFORMS

Micro/nano scale motion control, advanced manufacturing, active suspension systems,

transportation systems, human-machine interactions

ADAPTIVE CONTROL and VIBRATION REJECTION

Adaptive vibration rejection: minimum-parameter adaptive schemes to 08/2009-Present

reject audio vibrations and multiple narrow-band disturbances.

Youla parameterization based local loop shaping: reduced complexity 11/2011-Present

IIR-filter-based Youla parameterizations for adaptive vibration rejection in

dual-input-single-output systems

HIGH-PRECISION MOTION CONTROL

Decoupled disturbance observers: loop-shaping for MISO 05/2011-10/2012

(multiple-input-single-output) systems (e.g. dual-stage hard disk drives).

Learning based trajectory tracking in wafer scanners: an iterative learning 03/2011-08/2011

approach for offline and online trajectory tracking.

LEARNING CONTROL

Spiral writing for hard disk drives: high-performance learning control 08/2008-08/2009

algorithms for spiral writing on servo track writers.

Enhanced repetitive control: an enhanced repetitive control with 10/2011-Present

improved steady-state performance and accelerated transient.

OPTIMIZATION-BASED CONTROL

Optimal filter design: band-pass filter design with linear-phase and 08/2010-Present

arbitrary magnitude constraints.

Strictly positive real (SPR) filter design: a multi-objective optimization 09/2011-10/2012

approach to address the robust SPR design problem in system

identification and adaptive control.

Undergraduate Student Researcher at Tsinghua University 02/2008-07/2008

Porous aluminum alloy via direct gas injection: new modeling and realization of the foaming

of A356 aluminum alloy by direct air injection

UC Berkeley ME C232 / EE C220A : Advanced Control Systems I

TEACHING Fall 2012

Position: graduate student instructor lead weekly discussion sessions, prepare

EXPERIENCE

homework solutions, and make some of the homework and exam problems.

Instructor: Masayoshi Tomizuka

UC Berkeley ME 132: Dynamical Systems and Feedback Fall 2011

Position: reader grade homework; provide feedback to the instructor and

graduate student instructors.

Instructor: Kameshwar Poolla

INDUSTRY Research Intern at Western Digital Co., San Jose, California

Seek-settle improvement in hard disk drives: designed and realized on the

EXPERIENCE 06/2010-07/2010

test drive a new servo controller that achieved as large as 27.75%

settle-TMR improvement and 8.63% settle-time reduction.

Research Intern at Western Digital Co., Irvine, California

Loop shaping and vibration rejection: designed a new control scheme 05/2011-08/2011

used in mass production, and two control algorithms for future products;

filed a patent.

Feedforward control: designed a new feedforward scheme for vibration 05/2012-07/2012

rejection; filed a patent.

ACADEMIC Journal Referee

SERVICES

IEEE Transactions on Control Systems Technology

Automatica

International Journal of Control

IEEE Transactions on Magnetics

Asian Journal of Control

Conference Referee

IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM)

International Federation of Automatic Control (IFAC) World Congress

IEEE American Control Conference (ACC)

SPORTS Finished half marathon in 2005, Beijing

Sport climbing training level 1: Hong Kong Mountaineering Union training certificate

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