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

      • J.R. Homer, and R. Nagamune. “Physics-based 3-D control-oriented modeling of floating wind turbines,” IEEE Transactions on Control Systems Technology 26, no. 1 (2018): 14-26, 2018.
      • A.Z. Nia, and R. Nagamune, “Switching gain-scheduled proportional–integral–derivative electronic throttle control for automotive engines,” Journal of Dynamic Systems, Measurement, and Control140(7), p.071015, 2018.
      • P. Zhao, R. Nagamune, and M. Chiao, “Multiple parameter-dependent robust control of miniaturized optical image stabilizers,” Control Engineering Practice76, pp.1-11, 2018.
      • P. Zhao, and R. Nagamune, “Switching linear parameter‐varying control with improved local performance and optimized switching surfaces,” International Journal of Robust and Nonlinear Control28(10), pp.3403-3421, 2018.
      • A. Alizadegan, P. Zhao, R. Nagamune, and M. Chiao, “Robust H∞ control of miniaturized optical image stabilizers against product variabilities,” Control Engineering Practice80, pp.70-82, 2018.
      • P. Zhao, and R. Nagamune, “Discrete-Time State-Feedback Switching LPV Control with Separate Lyapunov Functions for Stability and Local Performance,” In 2018 Annual American Control Conference (ACC) (pp. 2023-2028). IEEE, 2018.
      • M. Rostam, R. Nagamune, and V. Grebenyuk, “Switching Gain-Scheduled Linear-Quadratic-Regulator Control for Integrated Solar Thermal Hydronic Systems,” In 2018 Annual American Control Conference (ACC) (pp. 2581-2586). IEEE, 2018.
      • P. Zhao, and R. Nagamune, “Switching LPV controller design under uncertain scheduling parameters,” Automatica76, pp.243-250, 2017.
      • P. Zhao, and R. Nagamune, “Optimal switching surface design for switching LPV control and its application to air-fuel ratio control of an automotive engine,” In 2017 IEEE Conference on Control Technology and Applications (CCTA)(pp. 898-903). IEEE, 2017.
      • S. Hosseinirad, R. Nagamune, and V. Grebenyuk, “Simultaneous optimization of configuration and controller parameters in an integrated solar thermal hydronic system,” In 2017 American Control Conference (ACC) (pp. 2931-2936). IEEE, 2017.
      • C. Han, J.R. Homer, and R. Nagamune, “Movable range and position control of an offshore wind turbine with a semi-submersible floating platform,” In 2017 American Control Conference (ACC) (pp. 1389-1394). IEEE, 2017.
      • K. Yuan, A. Alizadegan, P. Zhao, R. Nagamune, J. Chu, S. Park, and M. Chiao, “Design, Fabrication, and Robust Control of Miniaturized Optical Image Stabilizers,” In Advanced Mechatronics and MEMS Devices II (pp. 637-657). Springer, Cham, 2017.
      • M. Hanifzadegan, and R. Nagamune, “Contouring control of cnc machine tools based on linear parameter-varying controllers,” IEEE/ASME Transactions on Mechatronics21(5), pp.2522-2530, 2016.
      • C. Han, and R. Nagamune, “Position control of an offshore wind turbine with a semi-submersible floating platform using the aerodynamic force,” In 2016 IEEE Canadian Conference on Electrical and Computer Engineering (CCECE)(pp. 1-4). IEEE, 2016.
      • A. Alizadegan, P. Zhao, R. Nagamune, and M. Chiao, “Modeling and robust control of miniaturized magnetically-actuated optical image stabilizers,” In 2016 IEEE International Conference on Advanced Intelligent Mechatronics (AIM) (pp. 846-851). IEEE, 2016.
      • M. Hanifzadegan, and R. Nagamune, “Tracking and structural vibration control of flexible ball–screw drives with dynamic variations,” IEEE/ASME Transactions on Mechatronics20(1), pp.133-142, 2015.
      • O. Bagherieh, and R. Nagamune, “Gain-scheduling control of a floating offshore wind turbine above rated wind speed,” Control Theory and Technology13(2), pp.160-172, 2015.
      • J.R. Homer, and R. Nagamune, “Control-oriented physics-based models for floating offshore wind turbines,” In 2015 American Control Conference (ACC) (pp. 3696-3701). IEEE, 2015.
      • P. Zhao, and R. Nagamune, “Optimal switching surface design for state-feedback switching LPV control,” In 2015 American Control Conference (ACC) (pp. 817-822). IEEE, 2015.
      • A.Z. Nia, V. Grebenyuk, and R. Nagamune, “Modeling and control for an integrated thermal hydronic system,” In 2015 IEEE 28th Canadian Conference on Electrical and Computer Engineering (CCECE) (pp. 1060-1065). IEEE, 2015.
      • P. Zhao, A. Alizadegan, R. Nagamune, and M. Chiao, “Robust control of large-scale prototypes for miniaturized optical image stabilizers with product variations,” In 2015 54th Annual Conference of the Society of Instrument and Control Engineers of Japan (SICE) (pp. 734-739). IEEE, 2015.
      • 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), pp. 4354–4359, 2014.
      • 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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