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| 1 | Gain-scheduling control of a floating offshore wind turbine above rated wind speed显示文摘This paper presents an application of gain-scheduling(GS) control techniques to a floating offshore wind turbine on a barge platform for above rated wind speed cases. Special emphasis is placed on the dynamics variation of the wind turbine system caused by plant nonlinearity with respect to wind speed. The turbine system with the dynamics variation is represented by a linear parameter-varying(LPV) model, which is derived by interpolating linearized models at various operating wind speeds. To achieve control objectives of regulating power capture and minimizing platform motions, both linear quadratic regulator(LQR) GS and LPV GS controller design techniques are explored. The designed controllers are evaluated in simulations with the NREL 5 MW wind turbine model, and compared with the baseline proportional-integral(PI) GS controller and non-GS controllers. The simulation results demonstrate the performance superiority of LQR GS and LPV GS controllers, as well as the performance trade-off between power regulation and platform movement reduction. | Omid BAGHERIEH Ryozo NAGAMUNE | 2015 | Control Theory and Technology2015，13，2： | 5 |
| 2 | Double-loop robust tracking control for micro machine tools显示文摘This paper addresses double-loop robust tracking controller design of the miniaturized linear motor drive precision stage with mass and damping ratio uncertainties.As an inner-loop,a disturbance observer(DOB) is employed to suppress exogenous low frequency disturbances such as friction and cutting force.To further eliminate the residual disturbance and to guarantee the robust tracking to the reference input,a-synthesis outer-loop controller is designed.For eliminating the steady state error,a technique is proposed to design the-synthesis outer-loop controller with an integrator.A guideline to select the bandwidth of the Q-filter in the DOB is provided.Simulations using a model of a prototype micro-milling machine indicate that the proposed outer-loop synthesis scheme is superior to the H suboptimal control in disturbance rejection performance and steady state tracking performance.Furthermore,it is shown experimentally that the proposed double-loop robust tracking controller improves the tracking performance of the stage by 29.6% over PID control with a DOB inner-loop. | FAN ShiXun NAGAMUNE Ryozo FAN DaPeng | 2011 | Science China(Technological Sciences)2011，54，11： | 2 |
| 3 | Platform motion minimization using model predictive control of a floating offshore wind turbine显示文摘Wind turbines are installed offshore with the assistance of a floating platform to help meet the world’s increasing energy needs.However,the incident wind and extra incident wave disturbances have an impact on the performance and operation of the floating offshore wind turbine(FOWT)in comparison to bottom-fixed wind turbines.In this paper,model predictive control(MPC)is utilized to overcome the limitation caused by platform motion.Due to the ease of control synthesis,the MPC is developed using a simplified model instead of high fidelity simulation model.The performance of the controller is verified in the presence of realistic wind and wave disturbances.The study demonstrates the effectiveness of MPC in reducing platform motions and rotor/generator speed regulation of FOWTs. | Kamran Ali Shah Ye Li Ryozo Nagamune Yarong Zhou Waheed Ur Rehman | 2021 | Theoretical & Applied Mechanics Letters2021，11，5： | 2 |
| 4 | H∞position transfer and regulation for floating offshore wind turbines显示文摘This paper proposes H∞controller design for platform position transfer and regulation of floating offshore wind turbines.The platform movability of floating wind turbines can be utilized in mitigating the wake effect in the wind farm,thereby maximizing the wind farm's total power capture and efficiency.The controller is designed so that aerodynamic force is adjusted to meet the three objectives simultaneously,that is,1)to generate the desired electrical power level,2)to achieve the desired platform position,and 3)to suppress the platform oscillation.To acquire sufficient aerodynamic force to move the heavy platform,the pitch-to-stall blade pitching strategy is taken instead of the commonly-used pitch-to-feather strategy.The desired power level is attained by the standard constant-power strategy for the generator torque,while Hstate-feedback control of blade pitch and nacelle yaw angles is adopted for the position regulation and platform oscillation suppression.Weighting constants for the H∞controller design are adjusted to take the trade-off between the position regulation accuracy and the platform motion reduction.To demonstrate the efficiency of the proposed controler,a virtual 5-MW semi-submersible wind turbine is considered.Simulation results show that the designed H∞controller successfully accomplishes the platform position transfer and regulation as well as the platform oscillation reduction against wind and wave disturbances,and that it outperforms a previously-proposed linear quadratic controller with an integrator. | Eduardo Eribert ESCOBAR AQUINO Ryozo NAGAMUNE | 2020 | Control Theory and Technology2020，18，3： | 2 |
| 5 | Fabrication of vertical-microcavity quantum wire lasers 显示文摘 | ARAKAWA T NISHIOKA M NAGAMUNE Y | 1994 | Appl Phys Lett1994，64，17： | 1 |
| 6 | Synthesis and antimicrobial characteristics of novel antimicrobial agent,1,4-dialkyl-1,4 -dihydroxyethylpiperadinium diiodides immobilized on inorganic materials显示文摘 | ZHOU F MAEDA T NAGAMUNE H | 2003 | Biocontrol Science2003，8，4： | 1 |
| 7 | Simulation-based medical education in clinical skills laboratory显示文摘 | Akaike M Fukutomi M Nagamune M | 2012 | J Med Invest2012，59，12： | 1 |
| 8 | Simulation-based medical edu- cation in clinical skills laboratory显示文摘 | Akaike M Fukutomi M Nagamune M | 2012 | J Med Invest2012，59，12： | 1 |
| 9 | Synthesis and antimicrobial characteristics of novel biocides,1,1'-(decanedioyl) bis (4-methyl-4-alkylpiperazinium iodide) s with gemini structure显示文摘 | ZHOU F MAEDA T NAGAMUNE H | 2004 | Biocontrol Science2004，9，3： | 1 |
| 10 | Double-bundle ACL reconstruction can improve rotational stability显示文摘 | Yagi M Kuroda R Nagamune K | | 0，，： | 1 |
| 11 | Production of hexaploid wheats with waxy endosperm character 显示文摘 | Kiribuchi-otobe C Nagamune T Yanagisawa T | 1997 | Cereal Chem1997，74，： | 1 |
| 12 | Simulation-basedmedical education in clinical skills laboratory显示文摘 | Akaike M Fukutomi M Nagamune M | 2012 | J Med Invest2012，59，12： | 1 |
| 13 | Double-bundle ACL reconstruction can improve rotational stability显示文摘 | Yagi M Kuroda R Nagamune K | 2007 | Clin Orthop Relat Res2007，，454： | 1 |
| 14 | Double-bundle ACL reconstruction can improve rotational stability显示文摘 | YAGI M KURODA R NAGAMUNE K | 2007 | Clin Orthop Relat Res2007，454，： | 1 |
| 15 | Two subunits of glycosylphosphatidylinositol transamidase, GPI8 and PIG-T, form a functionally important intermolecular disulfide bridge 显示文摘 | Ohishi K Nagamune K Maeda Y | 2003 | J Biol Chem2003，278，13： | 1 |
| 16 | Comparative genomic and phylo- genetic analyses of Calcium ATPases and calcium-regula- ted proteins in the apicomplexa显示文摘 | Nagamune K Sibley LD | 2006 | Mol Biol Evol2006，23，8： | 1 |
| 17 | The effect of intra-operative knee flexion angle on determination of graft location in the anatomic double-bundle anterior cruciate ligament reconstruction 显示文摘 | Hoshino Y Nagamune K Yagi M | 2009 | Knee Surg Sports Traumatol Arthrosc2009，17，9： | 1 |
| 18 | Double-bundle ACL reconstruction can improve rotational stability显示文摘 | Yagi M Kuroda R Nagamune K | 2007 | Clin Orthop Relat Res2007，454，： | 1 |
| 19 | The effect of graft tensioning in anatomic 2-bundle ACL reconstruction on knee joint kinematics 显示文摘 | Hoshino Y Kuroda R Nagamune K | 2007 | Knee Surg Sports Traumatol Arthrosc2007，15，5： | 1 |
| 20 | Gain-scheduling control of port-fuel-injection processes 显示文摘 | WHITE A CHOI J NAGAMUNE R | 2011 | Control Engineering Practice2011，19，4： | 1 |
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