Ryozo Nagamune

Ryozo Nagamune

Ryozo Nagamune

Associate Professor

B.Sc. (Osaka University), M.Sc. (Osaka University), Ph.D. (Royal Institute of Technology Stockholm, Sweden)

phone: (604) 827-4344
fax: (604) 822-2403
email: nagamune@mech.ubc.ca
website:  Control Engineering Laboratory
office: KAIS 3104

Research Interests

Control Engineering:

  • Multiple robust control
  • Parameter variation identification
  • Nevanlinna-Pick interpolation approach to robust control
  • Machine tool servo control
  • Wind turbine control
  • Automotive engine control
  • Hard disk drive track-following control
  • Robust chatter stability analysis
  • Magnetically actuated microlens control

Current Research Work

  • Multiple robust control: Research on multiple robust controller design is underway, to achieve high control performance of closed-loop systems in the case when dynamics variations of the plant are large and the required performance cannot be achieved by a single robust controller. This research is supported by NSERC.
  • Machine tool servo control: Modelling and control methods for machine tool drives are being developed. The research aims at improving the positioning accuracy of the workpiece and the disturbance rejection caused by the cutting force in machining process. This research is a part of a strategic project with 18 faculty members in Canada led by Professor Altintas, and supported by NSERC.
  • Automotive engine fuel-injection control: Switching gain-scheduled controller design has been applied to air-fuel ratio control in spark-ignition port-fuel-injection automotive engines. The programmable MotoHawk Engine Control Unit, funded by NSERC RTI, will be used to implement the new controller to an engine placed on an engine dynamometer. Initial work was done in collaboration with Professors George Zhu and Jongeun Choi at Michigan State University.
  • Control of floating offshore wind turbines: Controller design for floating offshore wind turbines is under development, by simultaneously taking into account maximizing the turbines’ efficiency, minimizing structural loading, and minimizing the platform motion due to the wave.
  • Robust chatter stability analysis: Research on robust chatter stability analysis in time-domain has been recently initiated in collaboration with Professor Simon Park at the University of Calgary. The objective is to obtain accurate stability lobe to predict the chatter during the cutting process, by taking into account process parameter variations explicitly.
  • Control of magnetically actuated microlens: In collaboration with Professor Mu Chiao at UBC, a MEMS-based magnetically actuated microlens is being developed. The research objective is, by using feedback control, to develop a novel mechanism to compensate for unintentional hand vibrations in taking photos with mobile phones. This research is supported by NSERC SPG.
  • Selected Publications

    • P. Pournazari, R. Nagamune, and M. Chiao, “A concept of a magnetically-actuated optical image stabilizer for mobile applications,” Consumer Electronics, IEEE Transactions on, vol. 60, no. 1, pp. 10–17, 2014.
    • M. Hanifzadegan and R. Nagamune, “Smooth switching LPV controller design for LPV systems,” Automatica, vol. 50, no. 5, pp. 1481–1488, 2014.
    • M. Hanifzadegan and R. Nagamune, “Switching Gain-Scheduled Control Design for Flexible Ball-Screw Drives,” Journal of Dynamic Systems, Measurement, and Control, vol. 136, no. 1, p. 014503, 2014.
    • K. S. McClure, R. Nagamune, D. Marshman, T. Chmelyk, and B. Gopaluni, “Robust level control of a dry-surge ore pile,” The Canadian Journal of Chemical Engineering, vol. 92, no. 3, pp. 486–495, 2014.
    • O. Bagherieh and R. Nagamune, “Utilization of blade pitch control in low wind speed for floating offshore wind turbines,” in American Control Conference (ACC), 2014, 2014, pp. 4354–4359.
    • M. Postma and R. Nagamune, “Air-fuel ratio control of spark ignition engines using a switching LPV controller,” Control Systems Technology, IEEE Transactions on, vol. 20, no. 5, pp. 1175–1187, 2012.
    • E. A. Yazdi and R. Nagamune, “ROBUST FINITE-TIME TRACKING WITH SWITCHED CONTROLLERS,” Control and Intelligent Systems, vol. 40, no. 3, 2012.
    • E. Azadi Yazdi and R. Nagamune, “A parameter set division and switching gain-scheduling controllers design method for time-varying plants,” Systems & Control Letters, vol. 60, no. 12, pp. 1016–1023, 2011.
    • E. A. Yazdi, M. Sepasi, F. Sassani, and R. Nagamune, “Automated multiple robust track-following control system design in hard disk drives,” Control Systems Technology, IEEE Transactions on, vol. 19, no. 4, pp. 920–928, 2011.
    • A. White, J. Choi, R. Nagamune, and G. Zhu, “Gain-scheduling control of port-fuel-injection processes,” Control Engineering Practice, vol. 19, no. 4, pp. 380–394, 2011.

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