publications

2023

1. Numerical and experimental investigation of a floating overhead power transmission system

   Ruo Luo, Yingyi Liu, Hongzhong Zhu, and 1 more author

   Ocean Engineering, 2023

2022

1. Experimental study and attitude control of a floating type shrouded wind turbine

   Hongzhong Zhu, and Makoto Sueyoshi

   Sustainable Energy Technologies and Assessments, 2022
2. A Numerical Investigation of an Offshore Overhead Power Transmission System

   Ruo Luo, Hongzhong Zhu, and Changhong Hu

   2022

3. 

   Optimal Semi-Active Control for a Hybrid Wind-Wave Energy System on Motion Reduction

   Hongzhong Zhu

   IEEE Transactions on Sustainable Energy, 2022

   Abs PDF Website

   Integration of wave energy converters and floating wind turbine can potentially reduce the levelized cost of energy. The coupling effects between the wave energy converters and the foundation, however, could amplify the foundation motion so that both the efficiency and the fatigue life of wind turbine would be degraded. In this study, wave energy converters are designed as a controlled suspension system for a novel hybrid wind-wave energy system, and an optimal semi-active control method having predictive ability is proposed for reducing the foundation motion. In the controller design, the physical constraints and the passivity of the wave energy converters are also taken into consideration. A full numerical model taking account of aero-hydro-servo-mooring coupled dynamics is proposed for a comprehensive analysis of the controller under various environmental conditions. Numerical results show that the foundation motion can be reduced by 16% even in very rough sea states with the help of the controller.

2021

1. A unified seakeeping and maneuvering analysis of multiple linked towing system with triangular Bodies

   Hongzhong Zhu, and Changhong Hu

   Ocean Engineering, 2021
2. A study on floating overhead power transmission system for offshore energy development: Design and modeling approach

   Hongzhong Zhu, and Changhong Hu

   Ocean Engineering, 2021
3. A Study on Electrical Wire and Floating Tower Interaction for an Offshore Overhead Power Transmission System

   Ruo Luo, Hongzhong Zhu, and Changhong Hu

   2021

2020

1. Integration of a semisubmersible floating wind turbine and wave energy converters: an experimental study on motion reduction

   Hongzhong Zhu, Changhong Hu, Makoto Sueyoshi, and 1 more author

   Journal of Marine Science and Technology, 2020
2. Disturbance observer-based torsional vibration damper for variable-speed wind turbines

   Hongzhong Zhu, and Shigeo Yoshida

   IFAC Journal of Systems and Control, 2020
3. An Experimental Study on Tower-Wire Interaction for Offshore Overhead Power Transmission Concept

   Hongzhong Zhu, Luo Ruo, Changhong Hu, and 1 more author

   In The autumn meeting of The Japan Society of Naval Architects and Ocean Engineers (JASNAOE), 2020
4. An Experimental Study on Tower-Wire Interaction for Offshore Overhead Power Transmission Concept

   Hongzhong Zhu, Luo Ruo, Changhong Hu, and 1 more author

   In The autumn meeting of The Japan Society of Naval Architects and Ocean Engineers (JASNAOE), 2020
5. 2020S-GS13-4 Numerical Study on a Multi-Body Ship Towing System for a Floating Offshore Tower

   Hongzhong Zhu, Changhong Hu, Makoto Sueyoshi, and 1 more author

   In Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 30, 2020

2019

1. A study on a floating type shrouded wind turbine: Design, modeling and analysis

   Hongzhong Zhu, Makoto Sueyoshi, Changhong Hu, and 1 more author

   Renewable Energy, 2019
2. 2019S-OS1-2 Design and Modeling of a Hybrid Wind-Wave Energy Concept

   Hongzhong Zhu, Changhong Hu, and Makoto Sueyoshi

   In Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 28, 2019

2018

1. Release of a reliable open-source package for performance evaluation of ocean renewable energy devices

   Yingyi Liu, Shigeo Yoshida, Hiroshi Yamamoto, and 4 more authors

   2018
2. A Study on Integration of Wave Energy Converter and Semi-Submersible Floating Wind Turbine: A Water Tank Test

   H. Zhu, C. Hu, M. Sueyoshi, and 1 more author

   In 4th Asian Wave and Tidal Energy Conference (AWTEC), 2018

2017

1. Torsional vibration reduction with augmented inverse model-based controller in wind turbine drivetrain

   Siti Fauziah Toha, Shigeo Yoshida, and Hongzhong Zhu

   Procedia Computer Science, 2017
2. A study on torsional vibration reduction for variable-speed variable-pitch wind turbines

   Hongzhong Zhu, Shigeo Yoshida, Hiroyuki Kajiwara, and 3 more authors

   In 2017 IEEE International Conference on Mechatronics (ICM), 2017
3. Modelling and attitude control of a shrouded floating offshore wind turbine with hinged structure in extreme conditions

   Hongzhong Zhu, Makoto Sueyoshi, Changhong Hu, and 1 more author

   In 2017 IEEE 6th International Conference on Renewable Energy Research and Applications (ICRERA), 2017

2016

1. Controller and control method

   Hiroshi Fujimoto, Hongzhong Zhu, Koji Yamamoto, and 1 more author

   2016

   US Patent 9,417,622
2. 2016S-GS6-15 Control of a Combined Floating Platform with Wave Energy Converter for Pitching Reduction

   Hongzhong Zhu, and Changhong Hu

   In Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 22, 2016
3. Optimum design of a passive suspension system of a semisubmersible for pitching reduction

   Hongzhong Zhu, Changhong Hu, and Yingyi Liu

   Journal of Dynamic Systems, Measurement, and Control, 2016
4. A study on control of wave energy converter for motion suppression of semisubmersible

   Hongzhong Zhu, and Changhong Hu

   IFAC-PapersOnLine, 2016
5. Suspension design of a semi-submersible platform

   Hongzhong Zhu, Changhong Hu, Yingyi Liu, and 1 more author

   In International Conference on Offshore Mechanics and Arctic Engineering, 2016

2015

1. Smooth output reconstruction for linear systems with quantized measurements

   Hongzhong Zhu, Toshiharu Sugie, and Hiroshi Fujimoto

   Asian Journal of Control, 2015
2. LQG ならびにスライディングモード制御によるドライブトレインダンパの基礎検討

   梶原宏之,  吉田茂雄,  朱洪忠, and 3 more authors

   風力エネルギー利用シンポジウム, 2015
3. 出力平滑化とドライブトレイン制振を両立する制御手法の基礎検討

   小川靖之,  中田成幸,  小野純二, and 3 more authors

   風力エネルギー利用シンポジウム, 2015

2014

1. Suppression of Current Quantization Effects for Precise Current Control of SPMSM Using Dithering Techniques and Kalman Filter

   Hongzhong Zhu, and Hiroshi Fujimoto

   Industrial Informatics, IEEE Transactions on, 2014
2. High-Precision Control for Ball-Screw-Driven Stage in Zero-Speed Region by Explicitly Considering Elastic Deformation

   Hongzhong Zhu, and Hiroshi Fujimoto

   MEC, 2014
3. Proposal of fast and high-precision control for ball-screw-driven stage by explicitly considering elastic deformation

   Hongzhong Zhu, and Hiroshi Fujimoto

   In 2014 IEEE 13th International Workshop on Advanced Motion Control (AMC), 2014
4. Mechanical deformation analysis and high-precision control for ball-screw-driven stages

   Hongzhong Zhu, and Hiroshi Fujimoto

   IEEE/ASME transactions on mechatronics, 2014

2013

1. Velocity estimation of motion systems based on low-resolution encoders

   Hongzhong Zhu, and Toshiharu Sugie

   Journal of Dynamic Systems, Measurement, and Control, 2013
2. Proposal of position reconstruction with polynomial fitting approach for precise motion control

   Hongzhong Zhu, Hiroshi Fujimoto, and Toshiharu Sugie

   IFAC Proceedings Volumes, 2013
3. Proposal of nonlinear friction compensation approach for a ball-screw-driven stage in zero-speed region including non-velocity-reversal motion

   Hongzhong Zhu, and Hiroshi Fujimoto

   In IECON 2013-39th Annual Conference of the IEEE Industrial Electronics Society, 2013
4. Overcoming current quantization effects for precise current control using dithering techniques

   Hongzhong Zhu, and Hiroshi Fujimoto

   IEEJ Journal of Industry Applications, 2013
5. Sinc-Function-Based Friction Compensation for Ball-Screw-Driven Stage in Zero-Velocity Region including Non-Velocity-Reversal motion

   Hongzhong Zhu, and Hiroshi Fujimoto

   hori. ku-tokyo. acjp, 2013
6. Angular Acceleration detection Method by Ultra-high Resolution Encoder with Hybrid Sampling Time for Automotive Motor application

   Masato Kanematsu, Hongzhong Zhu, Takayuki Miyajima, and 4 more authors

   In Proc. IEE of Japan Technical Meeting Record, RM-13-72, LD-13-82, HCA-13-048, 2013

2012

1. Overcoming current quantization effects for precise current control by combining dithering techniques and Kalman filter

   Hongzhong Zhu, and Hiroshi Fujimoto

   In IECON 2012-38th Annual Conference on IEEE Industrial Electronics Society, 2012
2. Servo Performance Enhancement of Motion System using Quantized Output Reconstruction Approach

   Hongzhong Zhu, Hiroshi Fujimoto, and Toshiharu Sugie

   電気学会研究会資料. IIC/電気学会産業計測制御研究会 [編], 2012
3. Optimal Analog-to-Digital Converter Resolution on Current Control for Precise Positioning Control

   Hongzhong Zhu, and Hiroshi Fujimoto

   電気学会研究会資料. IIC/電気学会産業計測制御研究会 [編], 2012

2011

1. Reconstruction of Plant Output from Quantized Measurement—A Moving Horizon Polynomial Fitting Approach

   Hongzhong Zhu, and Toshiharu Sugie

   IFAC Proceedings Volumes, 2011