Papers - HODAKA Ichijo
-
Optimizing Power Delivery in Inductive Wireless Power Transfer Systems Utilizing SPICE-Python Integration Invited Reviewed International coauthorship
Sabriansyah Rizqika Akbar, Achmad Basuki, Agung Setia Budi, Ichijo Hodaka
2024 12th Electrical Power, Electronics, Communications, Controls and Informatics Seminar (EECCIS) 2024.10
Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings)
-
A Mathematical Approach to Optimization Problem on Wireless Power Transfer Invited
Ichijo Hodaka
The 12th Electrical Power, Electronics, Communications, Control, and Informatics Seminar 2024 2024.10
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
-
Optimal Wireless Power Transfer Circuit without a Capacitor on the Secondary Side Reviewed International coauthorship
Sabriansyah Rizqika Akbar, Eko Setiawan, Takuya Hirata, Ichijo Hodaka
Energies 16 ( 6 ) 2023.3
Authorship：Corresponding author Publishing type：Research paper (scientific journal)
-
A Practical Method for Estimating Mutual Inductance in Wireless Power Transmission System Reviewed International coauthorship
Takuto Nakamura, Takuya Hirata, Eko Setiawan, Ichijo Hodaka
International Journal of Circuits, Systems and Signal Processing 16 1027 - 1034 2022.6
Authorship：Last author Language：English Publishing type：Research paper (scientific journal)
-
The Frequency Response and Steady-State Analysis on Wireless Power Transfer Using Square Wave Input Reviewed
Sabriansyah Rizqika Akbar; Eko Setiawan; Takuya Hirata; Kazuya Yamaguchi; Ichijo Hodaka
2021 International Conference on Sustainable Information Engineering and Technology (SIET) 2021.9
Language：English Publishing type：Research paper (international conference proceedings)
-
A Design Approach to Wireless High-Power Transfer to Multiple Receivers with Asymmetric Circuit Reviewed
Sabriansyah Rizqika Akbar, Ichijo Hodaka
international journal of circuits, systems and signal processing 15 125 - 134 2021.2
Language：English Publishing type：Research paper (scientific journal)
-
A fast spotting strategy of optimal frequency in wireless power transfer Reviewed
Akbar S.R., Hodaka I.
International Journal of Electrical and Electronic Engineering and Telecommunications 9 ( 4 ) 242 - 246 2020.7
Language：English Publishing type：Research paper (scientific journal) Publisher：International Journal of Electrical and Electronic Engineering and Telecommunications
© 2020 Int. J. Elec. & Elecn. Eng. & Telcomm. One of the most common questions in the Wireless Power Transfer (WPT) system is how to transfer much power over coils driven by the AC power source. This paper concerns how to determine the frequency of AC power source optimal to maximum WPT. Although it is theoretically possible to determine the optimal frequency by wide range frequency sweep, it is practically important to spot it in a few trials of frequency. This paper proposes a frequency spotting strategy using a square wave input power signal. The strategy avoids a long time-consuming sweeping process with knowledge of response by square wave input. The Automatic Multiscale-based Peak Detection (AMPD) algorithm is applied to select the initial peak finding on every data sample increment iteration to further analysis to find the set of peak patterns by calculating error parameters.
-
A novel nonlinear control of boost converter using CCM phase plane Reviewed
Setiawan E., Hodaka I.
International Journal of Electrical and Computer Engineering 8 ( 6 ) 4282 - 4289 2018.12
Language：English Publishing type：Research paper (scientific journal) Publisher：International Journal of Electrical and Computer Engineering
© 2018 Institute of Advanced Engineering and Science. All rights reserved. Boost converter is one of fundamental DC-DC converters and used to deliver electric power with boosted voltage in many electrical systems. Several control strategies have been applied to control a boost converter delivering a constant output voltage. Generally, boost converter works in two modes; one is called a Continuous Conduction Mode (CCM). Many researches use CCM model in the controller design, but they never ensure that the controller always works in CCM. This paper proposes novel nonlinear controller of boost converter designed using the modification of flow in phase plane. The proposed controller guarantees that the boost converter works only in CCM region. The simulation result confirms that our proposed controller brings the state variables from any initial point to a desired operating point successfully. copy; 2018 Institute of Advanced Engineering and Science.
-
An automatic pressure control method to continuous hydrogen generation system Reviewed
Yu Cherry Aung, Ichijo Hodaka
2018 Joint International Conference on Science, Technology and Innovation, Mandalay with Japan University & Company Research Group cooperated by IEEE 2018.10
Language：English Publishing type：Research paper (international conference proceedings)
-
Power efficiency improvement of wireless power transfer using magnetic material Reviewed
Morita S., Hirata T., Setiawan E., Hodaka I.
Proceedings of 2017 2nd International Conference on Frontiers of Sensors Technologies, ICFST 2017 2017-January 304 - 307 2017.12
Language：English Publishing type：Research paper (scientific journal) Publisher：Proceedings of 2017 2nd International Conference on Frontiers of Sensors Technologies, ICFST 2017
© 2017 IEEE. Efficiency improvement of wireless power transfer system is studied using ferrite bars with keeping distance of electric power transmission. Experiments are performed to decide better installation of ferrite bars for improving efficiency; there are many possibilities how and where to install them. We conducted several experiments and devised a method of installing ferrite bar with high effect on WPT. Each result is compared with the case of no ferrite bar system. The result of experiments shows using ferrite bars is practical and cost effective. Some suggestion is given to drive wireless power transfer system with lower frequency, which is also noteworthy about the limitation of available power source.
-
Accurate Symbolic Steady State Modeling of Buck Converter Reviewed
Eko Setiawan, Takuya Hirata, Ichijo Hodaka
International Journal of Electrical and Computer Engineering 7 ( 5 ) 2374 - 2381 2017.10
Language：English Publishing type：Research paper (scientific journal)
-
Embedded System Based on PWM Control of Hydrogen Generator with SEPIC Converter Reviewed
Cheikh Fall, Eko Setiawan, M.Afnan Habibi, Ichijo Hodaka
AIP Conference Proceedings 2017.8
Language：English Publishing type：Research paper (international conference proceedings)
DOI： 10.1063/1.5003501
-
The use of mathematics and electric circuit simulator software in the learning process of wireless power transfer for electrical engineering students Reviewed
M.Afnan Habibi,Cheikh Fall, Eko Setiawan, Ichijo Hodaka
AIP Conference Proceedings 2017.8
Language：English Publishing type：Research paper (international conference proceedings)
DOI： 10.1063/1.5003500
-
Top-down Approach in Control Engineering Education: Hydrogen Generation Case Reviewed
Eko Setiawan, M.Afnan Habibi,Cheikh Fall, Ichijo Hodaka
AIP Conference Proceedings 2017.8
Language：English Publishing type：Research paper (international conference proceedings)
DOI： 10.1063/1.5003499
-
Different Frequencies between Power and Efficiency in Wireless Power Transfer
Muhammad Afnan, Habibi, Hodaka, Ichijo
Memoirs of Faculty of Engineering, University of Miyazaki 46 31 - 34 2017.7
Language：English Publishing type：Research paper (bulletin of university, research institution)
-
Steady State Symbolic Analysis of Buck Converter using Fourier series Reviewed
Eko Setiawan, Takuya Hirata, Ichijo Hodaka
2017 2nd International Conference on Frontiers of Sensors Technologies (ICFST) 2017.2
Language：English Publishing type：Research paper (international conference proceedings)
-
A criterion on existence and uniqueness of behavior in electric circuit Reviewed
Hirata T., Setiawan E., Yamaguchi K., Hodaka I.
International Journal of Electrical and Computer Engineering 6 ( 4 ) 1529 - 1533 2016.8
Language：English Publishing type：Research paper (scientific journal) Publisher：International Journal of Electrical and Computer Engineering
Copyright © 2016 Institute of Advanced Engineering and Science. All rights reserved. Behavior of electric circuits can be observed by solving circuit equations symbolically as well as numerically. In general, symbolic computation for circuits with certain number of circuit elements needs much more time than numerical computation. It is reasonable to check the existence and uniqueness of the solution to circuit equations beforehand in order to avoid computation for the case of no solution. Indeed, some circuits have no solution; in that case, one should notice it and avoid to wait meaningless computation. This paper proposes a new theorem to check whether given circuit equations have a solution and their voltages and currents of all circuit elements are uniquely determined or not. The theorem is suitable for developing a computer algorithm and helps quick symbolic computation for electric circuits.
-
熱電発電システムにおける開放電圧を用いた最大出力点の探索法 Reviewed
奥将俊, 石津智子, 田島大輔, 迫田達也, 林則行, 穂高一条
日本太陽エネルギー学会誌 42 ( 4 ) 49 - 55 2016.7
Language：English Publishing type：Research paper (scientific journal)
-
Using square wave input for wireless power transfer Reviewed
Yamaguchi K., Hirata T., Hodaka I.
International Journal of Electrical and Computer Engineering 6 ( 1 ) 431 - 437 2016.2
Language：English Publishing type：Research paper (scientific journal) Publisher：International Journal of Electrical and Computer Engineering
Copyright © 2016 Institute of Advanced Engineering and Science. All rights reserved. A wireless power transfer (WPT) circuit is composed of a transmitting circuit with an AC power supply and a receiving circuit with a load, and the circuits are wirelessly connected each other. Then a designer chooses the wave form of the AC power supply. Many papers about WPT adopt a sinusoidal wave as the input. The frequency of the sinusoidal wave is generally determined to the resonant frequency of the circuit for high power transfer. Since the number of circuit elements in the power supply to generate a square wave is much less than that of a sinusoidal wave, WPT with a square wave input should be treated. In fact, some papers adopt a square wave as the input, and adjust the frequency of the square wave to the resonant frequency of the circuit. In this paper, we examine how the frequency of a square wave input affects power and efficiency of WPT circuits, and propose a procedure how to determine the frequency of the input to improve power and efficiency. Finally we discuss which wave should be adopted as an input and how the frequency of the input should be determined, regardless of whether resonant phenomena occur or not.
-
High power wireless power transfer driven by square wave inputs Reviewed
Yamaguchi K., Hirata T., Hodaka I.
Advances in Intelligent Systems and Computing 388 341 - 346 2016
Language：English Publishing type：Research paper (scientific journal) Publisher：Advances in Intelligent Systems and Computing
© Springer International Publishing Switzerland 2016. A power source used in wireless power transfer generates an AC wave to transfer electric power to a load which is not connected electrically but connected electromagnetically to the power source. In this paper, the power and efficiency are compared when a sinusoidal and a square waves which are typical AC waves are applied as power source voltage outputs. The condition under which the two waves respectively transfer equivalent power with electric wires is examined to figure out the effect of different waves. Then the power and efficiency are calculated by a mathematical approach with practical values of elements on various situations. Finally, this paper explores how input waves should be chosen for ideal wireless power transfer.
-
A general method to parameter optimization for highly efficientwireless power transfer Reviewed
Yamaguchi K., Hirata T., Hodaka I.
International Journal of Electrical and Computer Engineering 6 ( 6 ) 3217 - 3221 2016
Language：English Publishing type：Research paper (scientific journal) Publisher：International Journal of Electrical and Computer Engineering
Copyright © 2016 Institute of Advanced Engineering and Science. All rights reserved. This paper proposes a new and general method to optimize a working frequency and a load resistance in order to realize highly efficient wireless power transfer. It should be noticed that neither resonant frequency nor matched impedance maximizes efficiency of wireless power transfer circuit, in general. This paper establishes a mathematical model of a commonly used wireless power transfer circuit, and derives a mathematical expression of circuit efficiency which involves a working frequency, a load resistance and the other parameters as symbols. This enables us to find the optimal working frequency and load resistance. The result of this paper is compared with results by a method based on resonance and impedance matching, and then clarified by a numerical example.
-
A symbolic equation modeler for electric circuits Reviewed
Hirata T., Yamaguchi K., Hodaka I.
ACM Communications in Computer Algebra 49 ( 3 ) 80 - 82 2015.9
Language：English Publishing type：Research paper (scientific journal) Publisher：ACM Communications in Computer Algebra
When users analyze symbolically physical phenomena, software products which partially help them write a symbolic equation to the phenomena are available. In electric engineering, there are a few software products which compute symbolically voltages and currents of electric circuits. They cover the frequency response analysis on behavior of linear time-invariant (LTI) circuits. However, they do not cover symbolic computation on the time response of circuits. This paper introduces a software product which generates a model for computing the time response of LTI circuits.
-
Frequency auto-tuning for efficient wireless power transmission by using system identification method Reviewed
Yuta Yamamoto, Kazuya Yamaguchi, Takuya Hirata, Eko Setiawan and Ichijo Hodaka
The 3rd International Conference on Computer Engineering and Mathematical Sciences 798 - 799 2014.12
Language：English Publishing type：Research paper (international conference proceedings)
-
On Circuit Topologies of Wireless Power Transmission with Relay Coils Reviewed
Takuya Hirata, Yuta Yamamoto, Kazuya Yamaguchi, Eko Setiawan and Ichijo Hodaka
The 3rd International Conference on Computer Engineering and Mathematical Sciences 200 - 202 2014.12
Language：English Publishing type：Research paper (international conference proceedings)
-
Mathematical Expression of Optimal Frequencies for Wireless Power Transfer Reviewed
Kazuya Yamaguchi, Yuta Yamamoto, Takuya Hirata, Eko Setiawan and Ichijo Hodaka
The 3rd International Conference on Computer Engineering and Mathematical Sciences 826 - 827 2014.12
Language：English Publishing type：Research paper (international conference proceedings)
-
Factorizing the Monodromy Matrix of Linear Periodic Systems Reviewed
Ichiro Jikuya, Ichijo Hodaka
Proceedings of 19th IFAC World Congress 2014.8
Language：English Publishing type：Research paper (international conference proceedings)
-
A note on the input-output structure of linear periodic continuous-time systems with complex-valued coefficients Reviewed
Ichiro Jikuya, Ichijo Hodaka
the 21st International Symposium on Mathematical Theory of Networks and Systems (MTNS 2014) 2014.7
Language：English Publishing type：Research paper (international conference proceedings)
-
Kalman canonical decomposition of linear time-varying systems Reviewed
Jikuya I., Hodaka I.
SIAM Journal on Control and Optimization 52 ( 1 ) 274 - 310 2014.3
Language：English Publishing type：Research paper (scientific journal) Publisher：SIAM Journal on Control and Optimization
In this paper, a Kalman canonical decomposition of finite-dimensional linear timevarying continuous-time systems is revisited. Two types of Kalman canonical decompositions are considered; one is collectively dubbed the intervalwise Kalman canonical decomposition and the other is collectively dubbed the global Kalman canonical decomposition. Each type is classified into subtypes resulting from variants of controllabilities (i.e., controllability, reachability, and influenceability) and observabilities (i.e., observability, determinability, and visibility). This paper first investigates the invariance properties of subspaces resulting from variants of controllabilities and observabilities. This paper then gives a self-contained exposition of each Kalman canonical decomposition on an interval. The main result is to prove the existence of intervals on each of which each Kalman canonical decomposition exists. Moreover, the relations among different Kalman canonical decompositions are extensively studied and the inconsistency between the works by Youla and Weiss is resolved. © 2014 Society for Industrial and Applied Mathematics.
DOI： 10.1137/120873455
-
Symbolic Computer-Aided Design for Wireless Power Transmission Reviewed
Takuya Hirata, Ichijo Hodaka
Proceedings of the 2014 International Conference on Circuits, Systems, Signal Processing, Communications and Computers (CSSCC 2014) 2014.3
Language：English Publishing type：Research paper (international conference proceedings)
-
Using Non-Sinusoidal Inputs for Efficient Wireless Power Transmission Reviewed
Yuta Yamamoto, Ichijo Hodaka
Proceedings of the 2014 International Conference on Circuits, Systems, Signal Processing, Communications and Computers (CSSCC 2014) 2014.3
Language：English Publishing type：Research paper (international conference proceedings)
-
Efficient Wireless Power Transfer - Resonance Does Not Imply High Efficiency Reviewed
Kazuya Yamaguchi, Ichijo Hodaka
Recent Advances in Electrical and Computer Engineering 45 - 48 2014.3
Language：English Publishing type：Research paper (scientific journal)
-
Resonance and efficiency inwireless power transfer system Reviewed
Yamaguchi K., Hirata T., Yamamoto Y., Hodaka I.
WSEAS Transactions on Circuits and Systems 13 218 - 223 2014
Language：English Publishing type：Research paper (scientific journal) Publisher：WSEAS Transactions on Circuits and Systems
Many papers about wireless power transfer use resonant phenomena. In general if input frequency is adjusted to the resonant frequency, the amplitude of current or voltage will be maximal. Since the power of resistive load is determined by its current or voltage, the power will be maximal at the resonance. As for wireless power transfer, it is one of significant specifications to transfer power as much as possible. Then it is natural to try to maximize transmitted power with resonant phenomena. On the other hand, efficiency is another significant specification on wireless power transfer. However efficiency is defined as a ratio with two different powers, and it cannot be concluded that efficiency is always maximal when either power is maximal. Therefore efficiency has no straightforward relation with resonance in contrast with the relation between resonance and power. In this paper, we show an example which cannot realize the maximal efficiency, although resonant phenomena are caused and discuss why the situation is caused. An analytical method for wireless power transfer is clarified and how to choose an optimal frequency is scrutinized. The power of transmitting and receiving sides and efficiency are calculated by using mathematical models, e.g. a state equation, a transfer function.
-
Feedback effect for wireless high-power transmission Reviewed
Yamamoto Y., Yamaguchi K., Hirata T., Hodaka I.
WSEAS Transactions on Circuits and Systems 13 241 - 245 2014
Language：English Publishing type：Research paper (scientific journal) Publisher：WSEAS Transactions on Circuits and Systems
Wireless power transmission is based on electromagnetical phenomenon between two separate coils. In order to transfer power from one to the other, we have to cause a time-varying current along one coil. Many of conventional wireless power transmission systems suppose a sinusoidal current of the coil. One reason for it could be the convenience that we have a sinusoidal power source as the industry standard. If we can use a power source which generates many types of wave form, we do not necessarily use the sinusoidal wave. In this study, we propose to add a feedback signal on a sinusoidal signal, that is, we propose to utilize a non-sinusoidal input. We will evaluate the sinusoidal wave and non-sinusoidal wave from the viewpoint of transmission power and efficiency to secondary side.
-
Factorizing the monodromy matrix of linear periodic systems Reviewed
Jikuya I., Hodaka I.
IFAC Proceedings Volumes (IFAC-PapersOnline) 19 11743 - 11748 2014
Language：English Publishing type：Research paper (international conference proceedings) Publisher：IFAC Proceedings Volumes (IFAC-PapersOnline)
© IFAC. This note proposes a new approach to computing the Kalman canonical decomposition of finite-dimensional linear periodic continuous-time systems by extending the Floquet theory. Controllable and observable subspaces are characterized by factorizing the monodromy matrix. Then, the conditions for the existence of several periodic Kalman canonical decompositions are extensively studied. The relations to the Floquet factorization, the Floquet-like factorization, and the period-specific realization are also discussed.
-
Hirata T., Yamamoto Y., Yamaguchi K., Hodaka I.
WSEAS Transactions on Circuits and Systems 13 266 - 273 2014
Language：English Publishing type：Research paper (scientific journal) Publisher：WSEAS Transactions on Circuits and Systems
Conventional researches onWireless Power Transmission systems use experimental or numerical method to analyze the systems. However, the situation will be better if symbolic method is available. This paper develops a software which generates a state equation directly from schematics. The software helps engineers that design circuits and obtain characteristics of circuits to analyze the behavior of circuits with circuit parameters by symbolic computing. Our software also provides various perspectives of the system with circuit parameters.
-
Jikuya I., Hodaka I.
Proceedings of the American Control Conference 3171 - 3176 2013.9
Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of the American Control Conference
In this paper, a Kalman canonical decomposition of finite-dimensional linear periodic continuous-time systems is considered. This paper firstly investigates the invariance properties of the controllable subspace and the observable subspace. This paper then illustrates a counterexample to the existence of the periodic Kalman canonical decomposition in a typical setting, where the coefficients are restricted to be real-valued and the period of the transformed system is restricted to be the same as the given system. Motivated by this counterexample, this paper gives a self-contained exposition of the periodic Kalman canonical decomposition in real-valued coefficients. © 2013 AACC American Automatic Control Council.
-
A New Arrangement with Time-Varying Capacitance for Power Generation Reviewed
Takuya Hirata, Ichijo Hodaka, Masanori Ushimizu
International Journal of Energy 7 ( 1 ) 19 - 22 2013.5
Language：English Publishing type：Research paper (scientific journal)
-
A period-specific realization of linear continuous-time systems Reviewed
Hodaka I., Jikuya I.
Systems and Control Letters 62 ( 5 ) 395 - 400 2013.3
Language：English Publishing type：Research paper (scientific journal) Publisher：Systems and Control Letters
It is a well-known fact that a weighting pattern matrix has a periodic realization if and only if the matrix is separable and periodic. This fact, however, does not cope with a reasonable question of period-specific realization problem: for a given weighting pattern matrix and a given positive real number, find a periodic realization corresponding to the given matrix and with a period equal to the given number. This paper answers the question by showing that the period-specific realization problem has a solution if and only if the given weighting pattern matrix is separable and has a period equal to the given positive real number. To this end, two types of period-specific realizations are constructed. One is with a constant A-matrix whose dimension is not necessarily minimal among all possible period-specific realizations. The other is with a non-constant and periodically time-varying A-matrix whose dimension turned out minimal among all possible period-specific realizations. © 2013 Elsevier B.V. All rights reserved.
-
Study of Power Gneneration By Using Capacitor Reviewed
Takuya Hirata, Ichijo Hodaka, Masanori Ushimizu
Proceedings of the 12th International Conference on Electronics, Hardware, Wireless and Optical Communications (EHAC '13) 2013.2
Language：English Publishing type：Research paper (international conference proceedings)
-
Control of PWM on A Switching Circuit for Maximum Power Point Tracking Reviewed
Masanori Ushimizu, Ichijo Hodaka
Proceedings of the 12th International Conference on Electronics, Hardware, Wireless and Optical Communications (EHAC '13) 2013.2
Language：English Publishing type：Research paper (international conference proceedings)
-
Estimation of Coupling Coefficient for Wireless Power Transfer Reviewed
Kazuya Yamaguchi, Ichijo Hodaka, Yuta Yamamoto
Recent Advances in Circuits, Communications and Signal Processing 2013.2
Language：English Publishing type：Research paper (international conference proceedings)
-
A Practical Method to Diagnostics for DC-DC Converter By System Identification Approach Reviewed
Yuta Yamamoto, Ichijo Hodaka, Kazuya Yamaguchi
Recent Advances in Circuits, Communications and Signal Processing 101 - 104 2013.2
Language：English Publishing type：Research paper (international conference proceedings)
-
Improvement of maximum power point tracking based on nonlinear control of boost converter Reviewed
Setiawan E., Hodaka I., Yamamoto Y., Jikuya I.
Proceedings of 2012 IEEE Conference on Control, Systems and Industrial Informatics, ICCSII 2012 180 - 184 2012.12
Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of 2012 IEEE Conference on Control, Systems and Industrial Informatics, ICCSII 2012
A Maximum Power Point Tracking (MPPT) is commonly applied in photovoltaic system in order to harvest the maximal power. One of the widely used MPPT techniques is socalled Perturb and Observe (P & O). However, P & O MPPT has a shortage on operating point swinging around maximum power point (MPP), where one can never achieve a MPP. In order to reduce the shortage, new nonlinear control is presented. The proposed control is applied for boost converter which is commonly used in photovoltaic system. The controller is designed based on state-space averaging and nonlinear control theory. In the experiment, the proposed controller is implemented in a real circuit that utilizes solar array simulator to displace the photovoltaic module. Experiment result shows that the proposed method can suppress the oscillation of MPPT. © 2012 IEEE.
-
Symbolic Analysis of Maximizing Efficiency of Photovoltaic Power Generation Circuits Reviewed
Eko Setiawan, Ichijo Hodaka, Yuta Yamamoto
Proceedings of 11th WSEAS Int. Conf. on SYSTEM SCIENCE and SIMULATION in ENGINEERING (ICOSSSE '12) 2012.5
Language：English Publishing type：Research paper (international conference proceedings)
-
System Identification Approach to Diagnostics for Switching Circuits Reviewed
Yuta Yamamoto, Ichijo Hodaka, Eko Setiawan
Proceedings of 11th WSEAS Int. Conf. on SYSTEM SCIENCE and SIMULATION in ENGINEERING (ICOSSSE '12) 2012.5
Language：English Publishing type：Research paper (international conference proceedings)
-
Jikuya I., Hodaka I.
IFAC Proceedings Volumes (IFAC-PapersOnline) 18 ( PART 1 ) 1307 - 1312 2011.12
Language：English Publishing type：Research paper (international conference proceedings) Publisher：IFAC Proceedings Volumes (IFAC-PapersOnline)
This note discusses the steady state response of a linear periodic system with a periodic input, especially for linear systems with periodic and piecewise continuous coefficients. The first order approximation of the steady state response with respect to the period of time is obtained for general linear periodic systems. This result is then applied to analyze the buck-boost converter operating in continuous conduction mode. This mathematically clarifies conventional results of switching converters which have been deduced under physical inspections or assumptions. © 2011 IFAC.
-
On the Klimushchev–Krasovskii theorem Reviewed
Ichiro Jikuya, Ichijo Hodaka
Automatica 47 ( 10 ) 2323 - 2325 2011.10
Language：English Publishing type：Research paper (scientific journal)
-
An Explicit Parametrization of the Set of All Solutions to Linear Periodic Systems Reviewed
Ichiro Jikuya, Ichijo Hodaka
Proceedings of The 19th International Symposium on Mathematical Theory of Networks and Systems (MTNS 2010) 2010.7
Language：English Publishing type：Research paper (international conference proceedings)
-
Maximum parametrization of the set of all solutions to linear periodic systems Reviewed
Jikuya I., Hodaka I.
IFAC Proceedings Volumes (IFAC-PapersOnline) 4 ( PART 1 ) 7 - 11 2010
Language：English Publishing type：Research paper (international conference proceedings) Publisher：IFAC Proceedings Volumes (IFAC-PapersOnline)
In the Floquet representation theorem, a state transition matrix whose second argument is 0 is represented as a product of a real-valued periodic matrix function and a real-valued matrix exponential function. In contrast, we have proposed a novel representation as a product of a real-valued periodic matrix function and two real-valued matrix exponential functions. In this note, the structure of the previously proposed representation is intensively investigated in terms of the maximum parametrization. © 2010 IFAC.
-
A floquet-like factorization for linear periodic systems Reviewed
Jikuya I., Hodaka I.
Proceedings of the IEEE Conference on Decision and Control 6432 - 6437 2009.12
Language：English Publishing type：Research paper (scientific journal) Publisher：Proceedings of the IEEE Conference on Decision and Control
In this note, the novel representation is proposed for a linear periodic continuous-time system with T-periodic real-valued coefficients. We prove that a T-periodic real-valued factor and two real-valued matrix exponential functions can be extracted from a state transition matrix, while, in the wellknown Floquet representation theorem, a 2T-periodic real-valued factor and a real-valued matrix exponential function are extracted from the state transition matrix. Then we also proved that any T-periodic system can be transformed to a system with T-periodic real-valued trigonometric coefficients using a T-periodic real-valued coordinate transformation, while, in the well-known Lyapunov reducibility theorem, a 2T-periodic real-valued coordinate transformation is utilized to transform the given periodic system into a time-invariant system with real coefficients. This new information can be useful for designing a T-periodic control law. ©2009 IEEE.
-
電気二重層キャパシタ充電回路の制御
穂高一条，永松和也
宮崎大学工学部紀要 ( 38 ) 165 - 172 2009.9
Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
-
磁気トルカを用いた小型衛星の姿勢制御の可制御性について
穂高一条，渡邉泰三
宮崎大学工学部紀要 ( 38 ) 173 - 180 2009.9
Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
-
太陽光発電のためのNi-MH電池充電回路の制御
穂高一条，輝直樹
宮崎大学工学部紀要 ( 38 ) 181 - 188 2009.9
Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
-
太陽電池・電気的特性シミュレータの開発
穂高一条，平井大雅
宮崎大学工学部紀要 ( 38 ) 189 - 194 2009.9
Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
-
A period-specific realization of linear continuous-time systems Reviewed
Hodaka I., Jikuya I.
IFAC Proceedings Volumes (IFAC-PapersOnline) 17 ( 1 PART 1 ) 2008.12
Language：English Publishing type：Research paper (scientific journal) Publisher：IFAC Proceedings Volumes (IFAC-PapersOnline)
It is a well-known fact that a weighting pattern matrix is realizable as a linear periodic system if and only if the matrix is separable and periodic. This fact, however, can not cope with a reasonable question when a weighting pattern matrix can be realized as a linear periodic system with a specific period of time. This paper answers the question by constructing two types of period-specific realizations. Moreover, this paper describes in detail how the lowest dimension of period-specific realizations is identified. Copyright © 2007 International Federation of Automatic Control All Rights Reserved.
-
JIKUYA Ichiro, HODAKA Ichijo
44 ( 8 ) 692 - 694 2008.8
Language：Japanese Publishing type：Research paper (scientific journal)
-
A Period-Specific Realization of Linear Continuous-Time Systems Reviewed
I. Hodaka, I. Jikuya
Proceedings of the 17th IFAC World Congress 1287 - 1292 2008.7
Language：English Publishing type：Research paper (international conference proceedings)
-
JIKUYA Ichiro, HODAKA Ichijo
Transactions of the Society of Instrument and Control Engineers 44 ( 8 ) 692 - 694 2008
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Instrument and Control Engineers
Although it was shown in our previous paper that canonical periodic decomposition with the same period of a given linear periodic continuous-time system is invalid in general, it is shown here that decomposition with the double period is valid without any exception.
-
On a Period-specific Minimal Realization for Linear Periodic Systems Reviewed
HODAKA Ichijo, JIKUYA Ichiro
Transactions of the Society of Instrument and Control Engineers 44 ( 4 ) 302 - 308 2008
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Instrument and Control Engineers
This paper develops the realization theory for linear periodic continuous-time systems. The substantial difficulty in the period-specific realization problem is that there may be no solution among linear periodic systems whose dimensions are equal to the order of a given weighting pattern matrix, in sharp contrast with realization problems for general linear time-varying systems or linear time-invariant systems. This paper proves the existence of period-specific realizations even when there exists no realization with dimension equal to the order of the weighting pattern matrix. It is finally shown that the realizations obtained in this paper have a <I>minimal</I> dimension among all of possible realizations with a specific period of time.
-
On a Connection between Controllability and State-space Representation of Linear Periodic Systems Reviewed
HODAKA Ichijo, JIKUYA Ichiro
43 ( 12 ) 1090 - 1096 2007.12
Language：Japanese Publishing type：Research paper (scientific journal)
-
On Kalman canonical decomposition of linear periodic continuous-time systems with real coefficients Reviewed
Jikuya I., Hodaka I.
IFAC Proceedings Volumes (IFAC-PapersOnline) 3 ( PART 1 ) 257 - 262 2007.12
Language：English Publishing type：Research paper (scientific journal) Publisher：IFAC Proceedings Volumes (IFAC-PapersOnline)
In this note, structural decomposition of linear periodic continuous-time systems is discussed. A fundamental problem to decompose a state of a periodic system into controllable and uncontrollable parts is conjectured to be achieved by a continuously differentiable and periodic coordinate transformation with the same period of the system, however there is a counterexample to this conjecture. Hence we derive a condition for the existence of such a coordinate transformation. We also prove that, by relaxing a class of coordinate transformation, it is always possible to construct a periodic coordinate transformation with the double period of the periodic system.
-
A Note on Kalman Canonical Decomposition of Linear Periodic Continuous-Time Systems - Decomposition of State Space into Controllable and Uncontrollable Parts with the Same Period of Systems Reviewed
43 ( 10 ) 892 - 900 2007.10
Language：Japanese Publishing type：Research paper (scientific journal)
-
On Kalman Canonical Decomposition of Linear Periodic Continuous-Time Systems with Real Coefficients Reviewed
I. Jikuya, I. Hodaka
Preprints of 3rd IFAC Workshop ``Periodic Control Systems'' PSYCO 2007 (CD-ROM) 2007.8
Language：English Publishing type：Research paper (international conference proceedings)
-
On a possibility of decomposition of continuous-time linear periodic systems into controllable and uncontrollable parts Reviewed
43 ( 3 ) 239 - 241 2007.3
Language：Japanese Publishing type：Research paper (scientific journal)
-
Jikuya I., Hodaka I.
WSEAS Transactions on Systems 6 ( 1 ) 1 - 8 2007.1
Language：English Publishing type：Research paper (scientific journal) Publisher：WSEAS Transactions on Systems
This paper presents a geometric interpretation of stabilizability of linear periodic continuous-time systems, which is an extension of the well-known geometric approach for linear time-invariant systems. Although the existence of linear periodic state feedback with the same period of the system has been discussed in the conventional results, we admit a broader class and discuss a periodic state feedback with a twice period of a system (briefly double periodic state feedback) in order to derive a stabilizability condition in the coordinate free setting. For this end, stable, unstable and reachable subspaces in the state space for linear periodic systems are introduced. It will be shown that those subspaces are spanned by a smooth and doubly periodic basis and are invariant with respect to the fundamental solution. With these notions, it will be proven that a linear periodic system is stabilizable by doubly periodic state feedback if and only if the unstable subspace is contained in the reachable subspace, which is a well-known fact for linear time-invariant case.
-
Hodaka I., Jikuya I.
WSEAS Transactions on Systems 6 ( 1 ) 32 - 39 2007.1
Language：English Publishing type：Research paper (scientific journal) Publisher：WSEAS Transactions on Systems
This paper proposes an explicit formula for designing a periodic state feedback control law for a class of linear periodic continuous-time systems. The proposed control law sufficiently raises the frequency of a periodic coefficient matrix of a resultant closed-loop system so that the closed-loop system is exponentially stabilized, which is proved by introducing an averaging technique with quantitative evaluation. This enables closed-loop characteristic multipliers to converge to desired place, which are arbitrarily specified by the pole placement design for an averaged linear time-invariant system. The effectiveness of the proposed control law is demonstrated in a numerical example of attitude control of small satellites with magnetic actuator.
-
A Geometric Characterization of Stabilizability by Double Periodic State Feedback for Linear Periodic Continuous-Time Systems Reviewed
I. Jikuya, I. Hodaka
WSEAS Transactions on Systems 6 ( 1 ) 1 - 8 2007.1
Language：English Publishing type：Research paper (scientific journal)
-
A Periodic State Feedback Control Law by Raising Frequency for a Class of Linear Periodic Continuous-Time Systems Reviewed
I. Hodaka, I. Jikuya
WSEAS Transactions on Systems 6 ( 1 ) 32 - 39 2007.1
Language：English Publishing type：Research paper (scientific journal)
-
On a Connection between Controllability and State-space Representation of Linear Periodic Systems Reviewed
HODAKA Ichijo, JIKUYA Ichiro
Transactions of the Society of Instrument and Control Engineers 43 ( 12 ) 1090 - 1096 2007
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Society of Instrument and Control Engineers
This paper presents a new insight into controllability for linear periodic continuous-time systems. A number of necessary and sufficient conditions for linear periodic systems to be controllable have been proposed in mutually different forms. However, it is common for these conditions to be described in terms of input coefficients and fundamental solution matrices or transition matrices of the systems. On the other hand, more convenient controllability criterions such as PBH test are available for linear time-invariant systems: the criterions can be described by system matrices in the state-space representations instead of fundamental solution matrices. The purpose of this paper is to derive a controllability criterion in terms of system matrices for linear periodic systems in parallel with the case of linear time-invariant systems. To be precise, this paper proves the existence of <I>particular</I> state-space representations where controllability can be checked directly through system matrices.
-
Stabilizability of Linear Periodic Continuous-Time Systems by Double Periodic State Feedback Reviewed
I. Jikuya, I. Hodaka
Proceedings of the 2nd WSEAS International Conference on Dynamical Systems and Control (CR-ROM) 2006.10
Language：English Publishing type：Research paper (international conference proceedings)
-
A Periodic State Feedback Control Law for a Class of Continuous-Time Linear Periodic Systems Reviewed
I. Hodaka, I. Jikuya
Proceedings of the 2nd WSEAS International Conference on Dynamical Systems and Control (CD-ROM) 2006.10
Language：English Publishing type：Research paper (international conference proceedings)
-
On a period-specific realization problem for linear periodic systems Reviewed
42 ( 7 ) 806 - 813 2006.7
Language：Japanese Publishing type：Research paper (scientific journal)
-
A New Geometric Characterization of Stabilizability for Linear Periodic Continuous-Time Systems Reviewed
I. Jikuya, I. Hodaka
Proceedings of 17th International Symposium on Mathematical Theory of Networks and Systems 2928 - 2933 2006.7
Language：English Publishing type：Research paper (international conference proceedings)
-
On necessity of asymptotic stability for singularly perturbed systems Reviewed
42 ( 6 ) 701 - 703 2006.6
Language：Japanese Publishing type：Research paper (scientific journal)
-
Asymptotic assignment of characteristic multipliers using feedback control by raising frequency Reviewed
42 ( 5 ) 475 - 482 2006.5
Language：Japanese Publishing type：Research paper (scientific journal)
-
Characteristic multiplier assignment for linear periodic systems by raising frequency Reviewed
42 ( 5 ) 551 - 558 2006.5
Language：Japanese Publishing type：Research paper (scientific journal)
-
On the Use of the Averaging Method for the Characteristic Multiplier Placement Problem Reviewed
I. Jikuya, I. Hodaka
Proceedings of the 44th IEEE Conference on Decision and Control, 2005 and 2005 European Control Conference 7870 - 7875 2005.12
Language：English Publishing type：Research paper (international conference proceedings)
-
On the use of the averaging method for the characteristic multiplier placement problem Reviewed
Jikuya I., Hodaka I.
Proceedings of the 44th IEEE Conference on Decision and Control, and the European Control Conference, CDC-ECC '05 2005 7870 - 7875 2005.12
Language：English Publishing type：Research paper (scientific journal) Publisher：Proceedings of the 44th IEEE Conference on Decision and Control, and the European Control Conference, CDC-ECC '05
This paper proposes a novel approach for designing a periodic state feedback control law for a class of continuous-time linear periodic systems. The control law generates the sufficiently high frequency sinusoidal in the coefficient of the closed loop systems, then the closed loop solution is shown to be exponentially stable based on the averaging method. It is also shown that the closed loop solution is approximated by the solution of the average system. © 2005 IEEE.
-
A Periodic Feedback Control Strategy of Magnetic Torquers in Satellite Attitude Control Problems Reviewed
M. Ando, I. Hodaka
Proceedings of Gyeongnam-Tokai Special Sessions in 2005 JSASS-KSAS Joint International Symposium on Aerospace Engineering (CD-ROM) 2005.10
Language：English Publishing type：Research paper (international conference proceedings)
-
飛行機縦運動の自動操縦系統設計における減衰比と固有振動数の指定について-特異摂動法に基づくアプローチ Reviewed
軸屋一郎・穂高一条
日本航空宇宙学会論文集 53 ( 615 ) 147 - 153 2005.4
Language：Japanese Publishing type：Research paper (scientific journal)
-
連続時間・線形周期係数システムの高周波化フィードバック制御 Reviewed
穂高一条・軸屋一郎
計測自動制御学会論文集 40 ( 10 ) 1054 - 1059 2004.10
Language：Japanese Publishing type：Research paper (scientific journal)
-
A Flat-plate Wings Model for the Longitudinal Motion of Airplanes Reviewed
Y. Sunaga, I. Hodaka
Proceedings of 4th Gyeongnam-Tokai Aerospace Technology Symposium 206 - 211 2003.11
Language：English Publishing type：Research paper (international conference proceedings)
-
Attitude and Vibration Control of Space Structures Using Two Actuators Reviewed
B. Xu, I. Hodaka, M. Suzuki
Transactions of the Japan Society for Aeronautical and Space Sciences 46 ( 151 ) 1 - 6 2003.5
Language：English Publishing type：Research paper (scientific journal)
-
Attitude and vibration control of space structures using two actuators Reviewed
Bo X., Hodaka I., Suzuki M.
Transactions of the Japan Society for Aeronautical and Space Sciences 46 ( 151 ) 1 - 6 2003.1
Language：English Publishing type：Research paper (scientific journal) Publisher：Transactions of the Japan Society for Aeronautical and Space Sciences
In this paper, we propose a control design method to suppress flexible appendage vibration while controlling the attitude motion of space structures simultaneously using two different actuators; one a "slow" actuator, and the other a "fast" actuator. Because the frequency of flexible appendage vibration is much higher than that of attitude motion, this system naturally exhibits a two-time-scale dynamic behavior. After describing this system as a singularly perturbed system, the control laws of each subsystem were determined to have the following properties: the slow actuator only controls the attitude motion of space structures, and the fast actuator only suppresses flexible appendage vibration. A composite state feedback control is obtained by combining the slow subsystem and fast subsystem control laws. Simulation results are presented to show the effectiveness of this control design method.
DOI： 10.2322/tjsass.46.1
-
A Pole Assignment Method for Two-Time-Scale Systems in Controlling Longitudinal Motion of Airplane Reviewed
I. Hodaka, M. Suzuki
Proceedings of the ICASE/SICE Joint Workshop 77 - 78 2002.10
Language：English Publishing type：Research paper (international conference proceedings)
-
非線形特異摂動システムに対する動的な合成制御則 Reviewed
穂高一条・鈴木正之
計測自動制御学会論文集 37 ( 10 ) 934 - 943 2001.10
Language：Japanese Publishing type：Research paper (scientific journal)
-
Attitude and Vibration Control of Space Structures by Singular Perturbation Approach Reviewed
B. Xu, I. Hodaka, M. Suzuki
Proceedings of the 5th WSEAS International Multi-Conference on Circuits, Systems, Communications and Computers 195 - 199 2001.7
Language：English Publishing type：Research paper (international conference proceedings)
-
特異摂動システムの安定化とロバスト安定性 Reviewed
穂高一条・鈴木正之
計測自動制御学会論文集 36 ( 9 ) 757 - 765 2000.9
Language：Japanese Publishing type：Research paper (scientific journal)
-
Stabilization and Robust Stability of Singularly Perturbed Systems Reviewed
I. Hodaka, M. Suzuki
Preprints of 3rd IFAC Symposium on Robust Control Design 36 ( 9 ) 757 - 765 2000.6
Language：English Publishing type：Research paper (international conference proceedings)
-
New results for strict positive realness and feedback stability Reviewed
I. Hodaka, N. Sakamoto, M. Suzuki
IEEE Transactions on Automatic Control 45 ( 4 ) 813 - 819 2000.4
Language：English Publishing type：Research paper (scientific journal)
-
New results for strict positive realness and feedback stability Reviewed
Hodaka I., Sakamoto N., Suzuki M.
IEEE Transactions on Automatic Control 45 ( 4 ) 813 - 819 2000.4
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE Transactions on Automatic Control
This paper proposes an algorithm which enables the authors to characterize positive realness and three different classes of strict positive realness in terms of Riccati equations and inherent integrations. It has been an open question whether or not the feedback system consisting of a weakly strict positive realness and a nonlinear passivity is asymptotically stable. This paper also shows that the statement is indeed the case.
DOI： 10.1109/9.847128
-
Partial pole placement with specified stability margins - A generalization of the polynomial ILQ method Reviewed
13 ( 1 ) 30 - 37 2000.1
Language：Japanese Publishing type：Research paper (scientific journal)
-
Partial Pole Placement with Specified stability margins Reviewed
A. Satoh, I. Hodaka, K. Sugimoto
Proceedings of the 38th IEEE Conference on Decision and Control 2 1389 - 1390 1999.12
Language：English Publishing type：Research paper (international conference proceedings)
-
Partial pole placement with specified stability margins Reviewed
Satoh A., Hodaka I., Sugimoto K.
Proceedings of the IEEE Conference on Decision and Control 2 1389 - 1390 1999.12
Language：English Publishing type：Research paper (scientific journal) Publisher：Proceedings of the IEEE Conference on Decision and Control
This paper proposes a design method for state feedback control law which simultaneously ensures specified stability margins and partial pole placement. This design problem is reduced to a feasibility problem with LMI constraints and a non-linear equality constraint.
-
Robust control based on dissipativeness of open-loop systems Reviewed
12 ( 9 ) 549 - 557 1999.9
Language：Japanese Publishing type：Research paper (scientific journal)
-
Loopshaping by Quadratic Constraints on Open-Loop Transfer Functions Reviewed
I. Hodaka, M. Suzuki, N. Sakamoto
Learning, Control and Hybrid Systems, Springer Lecture Notes in Control and Information Sciences 241 416 - 431 1999.5
Language：English Publishing type：Research paper (other academic)
-
Controller design with guarantee of prescribed gain and phase margins Reviewed
35 ( 4 ) 577 - 579 1999.4
Language：Japanese Publishing type：Research paper (scientific journal)
-
Robust Control Design with Specified Gain and Phase Margins and Its Applications Reviewed
I. Hodaka, M. Suzuki, M. Itoh
Proceedings of the Mathematical Theory of Networks and Systems Symposium 189 - 192 1998.7
Language：English Publishing type：Research paper (international conference proceedings)
-
Output Feedback Control with Specified Gain and Phase Margins Reviewed
I. Hodaka, N. Sakamoto, M. Suzuki
Proceedings of IEEE Singapore International Symposium on Control Theory and Applications 152 - 155 1997.7
Language：English Publishing type：Research paper (international conference proceedings)
-
Passivity theorem on pseudo-strictly positive real condition Reviewed
32 ( 8 ) 1183 - 1189 1996.8
Language：Japanese Publishing type：Research paper (scientific journal)