ACADEMIC BACKGROUND  RESEARCH INTERESTS  PUBLICATIONS  TEACHING EXPERIENCE  INDUSTRIAL EXPERIENCE  HONORS/AWARDS  PROFESSIONAL ACTIVITIES

Last updated:  April 23, 2009

ACADEMIC BACKGROUND:

NSERC Postdoctoral Fellow in Mechanical Engineering, University of California, Berkeley, 2008.10-present

    Research focuses on the analytical analysis of the effects of nonlinear vibrations on machine health estimation, as well as the development of a structure-evolving intelligent mechatronic system for machinery condition monitoring.

    Advisor: Professor Fai Ma, Professor Wilson Wang

Ph.D. in Mechanical and Mechatronics Engineering, University of Waterloo, Canada, 2005.09-2008.09

    Thesis: An Intelligent System for Bearing Condition Monitoring

    Advisor: Professor Wilson Wang, Professor Farid Golnaraghi

M.Sc. in Control Engineering, Lakehead University, Canada, 2003.09-2005.08

    Thesis: Design and implementation of a tunable vibration absorber and a time-delayed vibration absorber

    Advisor: Professor Kefu Liu

B.Sc. in Mechanical Engineering, Minor in Electronics and Precision Instrument, Tianjin University, China, 1994.09-1998.07

    Project: A system designed for testing the performance of a programming controller

    Project Advisor: Professor Guangde Song

RESEARCH INTERESTS:

ü     Fault Diagnosis and Prognosis

ü     Machine/Tool/Aircraft/Spacecraft/Building Condition Monitoring

ü     Residual Life Prediction

ü     Intelligent Mechatronic Systems

ü     Machine Learning  and Computational Intelligence

ü     Instrumentation and Measurement

ü     Dynamical Systems

ü     System Optimization and Design

ü     Vibration and Control

ü     Linear/Nonlinear System Control

REFEREED JOURNAL PUBLICATIONS:

J1.    J. Liu and W. Wang, A wavelet cross-spectrum analysis technique for nonstationary feature extraction, submitted to ASME: Journal of Vibration and Acoustics, 2009.

J2.  J. Liu, W. Wang, and M.F. Golnaraghi, A neural fuzzy mapping framework for system control applications, submitted to Knowledge Based Systems, 2009.

J3.    J. Liu, W. Wang, E. Cubica, and M.F. Golnaraghi, A novel fuzzy framework for nonlinear system control, accepted for publication in Fuzzy Sets and Systems, 2009.

J4.    J. Liu, W. Wang, and M.F. Golnaraghi, An enhanced diagnostic system for bearing fault diagnostics, IEEE Transactions on Instrumentation and Measurement, 2009, (in press).

J5.    J. Liu and K. Liu, Application of an active electromagnetic vibration absorber in vibration suppression, Structural Control and Health Monitoring, 2009, (in press).

J6.    J. Liu, W. Wang, and M.F. Golnaraghi, A multi-step predictor with variable input pattern for dynamic system forecasting,  Mechanical Systems and Signal Processing, 23(5), 2009.

J7.    J. Liu, W. Wang, M.F. Golnaraghi, and K. Liu, Wavelet spectrum analysis for bearing fault diagnostics, Measurement Science and Technology, 19, pp. 1-9, 2008.

J8.    J. Liu, W. Wang, and M.F. Golnaraghi, An extended wavelet spectrum for bearing fault diagnostics, IEEE Transactions on Instrumentation and Measurement, 57(12), pp. 2801-2812, 2008.

J9.    J. Liu, W. Wang, and M.F. Golnaraghi, A GA-based feature optimization technique for bearing fault diagnostics, International Journal of Computer Science and Network Security, 7, pp. 62-68, 2007.

J10.    J. Liu and K. Liu, A tunable electromagnetic vibration absorber: characterization and application, Journal of Sound and Vibration, 295, pp. 708-724, 2006.

J11. K. Liu, J. Liu, and L. Liao, Application of a tunable electromagnetic damper in suppression of structural vibration, Transactions of CSME, 30, pp. 41-61, 2006.

J12. J. Liu and K. Liu, Several design issues on the tunable electromagnetic vibration absorber, Transactions of CSME, 29, pp. 655-668, 2005.

J13. K. Liu and J. Liu, The damped dynamic vibration absorbers: revisited and new result, Journal of Sound and Vibration, 284, pp.1181-1189, 2005.

J14.  K. Liu, L. Liao, and J. Liu, Comparison of two auto-tuning methods for a variable stiffness vibration absorber, Transactions of CSME, 29, pp. 81-96, 2005.

REFEREED CONFERENCE PAPERS:

C1.  J. Liu, S. Ghafari, W. Wang, F. Golnaraghi, and F. Ismail, Bearing fault diagnostics based on reconstructed features, to appear in Proceedings of the forty-third Annual Meeting of the IEEE Industry Applications Society, IAS 2008, Edmonton, Alberta, October 2008.

C2.  J. Liu, K. Liu, and H. Bai, Application of a time-delayed control system in vibration suppression, Proceedings of ICMA 2005, Niagara Falls, Ontario, 2005, pp. 230-235.

C3. J. Liu and K. Liu, Several design issues on the tunable electromagnetic vibration absorber, Proceedings of 2005 CCToMM Symposium on Mechanisms,    Machines and Mechatronics, Montreal, 2005.

TEACHING EXPERIENCE:

Sessional Instructor¹    Dept. of Mathematical Sciences, Lakehead University    Sep. 2007 − Dec. 2007

    MATH 1050:Trigonometry and Analytical Geometry

  ü       Held regular lectures for the class (3 hours per week).

ü       Prepared and marked the midterm and final exams.

ü       Answered the questions from  students.

ü       Supervised the teaching assistant to mark the assignments.

¹   Highly rated by the class with the average evaluation grade 4.8/5.0.

Teaching Assistant²    Dept. of Mechanical & Mechatronics Engineering, University of Waterloo    Jan. 2006 − Apr. 2008

Statics

Experimental Measurement and Statistical Analysis

Structure & Properties of Materials

Introduction to Microprocessors & Digital Logic

Introduction to Control Systems

ü       Engaged in weekly tutorial sessions.

ü       Helped students design and evaluate a model-scaled truss bridge.

ü       Marked the course project reports.

ü       Demonstrated in the Matlab simulation lab.

ü       Conducted laboratory demonstrations on the regression modeling of a strain gauge mass scale and the factorial experimental design of a paper helicopter.

ü       Marked the midterm and final exam papers.

ü       Arranged the final project competition: a PID-controlled miniature care track racing.

² Identified by the class as Our Best TA and the Teaching Assistant Excellence Award recipient.

Teaching Assistant    Dept. of Mechanical Engineering, Lakehead University   Sep. 2003 − Apr. 2005

INDUSTRIAL EXPERIENCE:

Production Manager    Invensys Appliance Controls, Weihai, P. R. China    Apr. 2000 − July 2001

Supervisor: Mr. Weibull (France)

    ü       Managed day-to-day operations of the production lines for the electromechanical timers (EC-series) and water valves (V3-series).

    ü       Key member of the team for ISO 9000 certification.

     ü       Implemented quality improvement program including spot audits, root-cause analysis, and implementation of remedial actions.

    ü       Conducted root-cause failure analysis in regard to equipment safety.

    ü       Performed short/long term production scheduling and monthly analysis.

Product Design Engineer    Invensys Appliance Controls, Weihai, P. R. China    July 1998 − Mar. 2000

Supervisor: Mr. Yujiang Shi

    ü       Maintained the responsibilities for the design and development of EC-Series electromechanical timers for household washers.

    ü       Conducted the layout, assembly and testing of the newly-designed products.

    ü       Developed three washing/spinning algorithms for front-load household washers.

    ü       Provided technical support to the daily production activities.

    ü       Involved in training the assembly staff.

HONORS / AWARDS:

National:

NSERC Postdoctoral Fellowship (PDF) ($CAD 40,000/year)³    2008 − 2010

³   The only recipient of this fellowship in the Dept. of Mechanical & Mechatronics Engineering, and one of the nineteen recipients of this fellowship at the

 University of Waterloo in 2008.

NSERC Postgraduate Scholarship (PGS D3) ($CAD 21,000/year)⁴    2005 − 2008

⁴  The only recipient of this scholarship in the Faculty of Engineering, and one of the five recipients of this scholarship at Lakehead University in 2005.

Governor General Gold Medal, Canada (Graduate Study Highest Honor)⁵    2006

⁵  Highest ranking student in the graduate degree programs, and the only recipient of this award at Lakehead University in 2006.

Provincial:

Ontario Graduate Scholarship (OGS)  ($CAD15,000/year)    2005 − 2006

Institutional:

Mechanical Engineering Teaching Assistant Excellence Award (Honor)    2008

University of Waterloo Graduate Scholarship ($CAD 3,000/year)    2007

University of Waterloo President Graduate Scholarship ($CAD 10,000/year)    2005 − 2008

University of Waterloo Engineering Faculty Graduate Scholarship ($CAD 3,000/year)    2006 − 2008

Lakehead University High Output and Performance Excellence Award (Highest Honor in Research)⁶    2006

⁶  The only recipient of this award in the Faculty of Engineering, and one of the two recipients of this award at Lakehead University in 2006.

Tianjin University Engineering Faculty Academic Excellence Award    1997 − 1998

Clock Association 1^st Grade Scholarship    1995 − 1997

Tianjin University Freshman Excellence Award    1994

PROFESSIONAL ACTIVITIES:

ü      Member, Canadian Society for Mechanical Engineering (CSME)

ü      Member, American Society of Mechanical Engineers (ASME)

ü      Member, Institute of Electrical and Electronics Engineers (IEEE)

ü      Member, Canadian Committee for the Theory of Machines and Mechanisms (CCToMM)

ü      Reviewers for many international journals such as the Journal of Sound and Vibration, Measurement Science and Technology, Mechanical Systems and Signal Processing, and Engineering Failure Analysis.