SATO Yasukazu

Affiliation

Faculty of Engineering, Division of Systems Research

Job Title

Professor

Date of Birth

1966

Research Fields, Keywords

Actuator, Mechatronics, Electromagnetic Actuator, Fluid Power Systems, Power Transmission

Mail Address

E-mail address

Related SDGs




写真a

The Best Research Achievement in Research Career 【 display / non-display

Education 【 display / non-display

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    1994

    Yokohama National University   Completed

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    1989

    Yokohama National University   Graduated

Degree 【 display / non-display

  • Master of Engineering - Yokohama National University

  • Doctor of Engineering - Yokohama National University

Campus Career 【 display / non-display

  • 2012.12
     
     

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Professor  

  • 2007.4
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    2012.11

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Associate Professor  

  • 2001.4
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    2007.3

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Associate Professor  

  • 1998.4
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    2001.3

    Duty   Yokohama National UniversitySchool of Engineering   Associate Professor  

  • 1994.4
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    1998.3

    Duty   Yokohama National UniversitySchool of Engineering   Lecturer  

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Academic Society Affiliations 【 display / non-display

  • 1988
     
     
     

    日本機械学会

  • 1994
     
     
     

    自動車技術会

  • 1990
     
     
     

    日本フルードパワーシステム学会

  • 1995
     
     
     

    電気学会

  • 1997
     
     
     

    IEEE, The Institution of Electrical and Electronics Engineers

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Research Areas 【 display / non-display

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Design engineering

  • Informatics / Robotics and intelligent systems

  • Informatics / Mechanics and mechatronics

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Machine elements and tribology

  • Others / Other  / Mchatronics

 

Research Career 【 display / non-display

  • Study on Motion Control

    Project Year:

  • Study on Fluid Power Systems

    Project Year:

  • Study on Electro-magnetic Actuator

    Project Year:

Books 【 display / non-display

  • Basic/Advanced Engineering for Automotive Course

    Hiroaki Morimura,Yasukazu Sato,Hidenori Kosaka,Mitsuharu Oguma( Role: Joint author)

    Society of Automotive Engineers of Japan, JSAE 

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    Language:Japanese Book type:Scholarly book

Thesis for a degree 【 display / non-display

  • シート形油圧制御弁による高速流体制御に関する研究(博士論文)

    佐藤恭一

    1994.3

    Doctoral Thesis   Single Work  

    DOI

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    横浜国立大学大学院工学研究科博士課程後期生産工学専攻

    弁の内部もれが無く,作動油中のごみや振動に強いシート形油圧制御弁を用いた流体制御を対象とし,その制御手法の一つである流体パルス制御の課題:(1)流体パルス制御シート弁の応答性の向上,(2)微小流量から大流量までの連続的な制御が行えるシート弁の開発,(3)従来のスプール弁制御で問題となっている重慣性負荷高速制御時のサージ圧力の低減とキャビテーションの回避を可能とするシート弁による電子油圧制御システムの構築,について成果をあげた。

  • 高速電磁弁による比例シート弁の制御に関する研究(修士論文)

    佐藤恭一

    1991.3

    Master Thesis   Single Work  

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    横浜国立大学大学院工学研究科博士課程前期生産工学専攻

    従来,開閉のオンオフ的な作動のみが可能であったシート弁本体にフィードバック流路を設けることにより,主弁開度をパイロット弁開度に比例して制御できる比例シート弁を開発した.主弁は油圧力により支持されるので,従来形シート弁に比べ,極めて高い剛性と固有振動数を持つ.反面,負荷圧力変動等の外乱をトリガーとして自励振動が発生しやすい問題が有り,これをボンドグラフを用いた動特性解析と,バランススプールの付加により解決した。

Papers 【 display / non-display

  • Highly Efficient Electrohydraulic Drive System Control Based on Efficiency Map and Reinforcement Learning

    Yuto ABE, Yasukazu SATO

    JFPS International Journal of Fluid Power System   19 ( 1 )   34 - 41   2026.1  [Reviewed]

    DOI

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Fluid Power System Society   Joint Work  

    An electrically driven pump with an actuator system without control valves is a candidate for eco-friendly electrohydraulic systems. The efficiency of a system combined with an electric servo motor and a variable displacement pump can be maximized if the optimal rotational speed and displacement are used. This study applied efficiency maps derived from regression and reinforcement learning to the control problem. It was confirmed that under certain conditions, the two proposed methods can achieve the same output power with higher efficiency than that of the conventional control method, which uses a fixed rotational speed or fixed displacement of the pump. The proposed control method using an efficiency map exhibited a stable performance although it required preliminary data collection. The other proposed method using reinforcement learning can be run without any knowledge about the environment, although it is sensitive to the noise in the measured value.

  • 1D Simulation of Automotive Transmission Valve System Behavior for Air-bubble-contained Transmission Oil

    MITAMURA Takehiko, SATO Yasukazu

    JFPS International Journal of Fluid Power System   19 ( 1 )   42 - 49   2026.1  [Reviewed]

    DOI CiNii Research

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Fluid Power System Society   Joint Work  

    <p>To improve the transmission performance at the design stage of model-based development (MBD), it is important to build a simulation model of the hydraulic control system of automotive transmission. This study constructed a measurement technology for linear solenoid valve behavior and a one-dimensional (1D) simulation model for the prediction of pressure control performance under air-bubble-containing oil conditions. In the pressure control valve of an automobile transmission, the load flow rate during pressure control is reduced and pressure is controlled with minimum power by balancing the annular gap flow in the overlap area of the spool, so it is necessary to build a simple flow characteristics model for the entire range from the underlap to the overlap state. In addition, it is also necessary to build a pipeline model that can freely set the retention of bubbles in the piping and load and the air mixing rate of the oil at each point. This paper presents the construction strategy of the 1D simulation model, including the modeling of the air-bubble-containing oil property and the modeling method of the spool position-valve opening area characteristics, which continuously expresses the lap condition of the valve port from underlap to overlap. The study findings contribute to the construction of automobile simulation infrastructure.</p>

  • Effect of the Pre-Training on Highly Efficient Electro-Hydraulic Drive System Control Using Reinforcement Learning

    Yuto ABE, Yasukazu SATO

    The Proceedings on Autumn Conference of Japan Fluid Power System Society 2025   80 - 82   2025.12  [Reviewed]

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (research society, symposium materials, etc.)   Single Work  

  • Highly efficient electro-hydraulic drive system control considering the response of hydraulic pump and electric motor

    Takuto HATTORI, Yasukazu SATO

    The Proceedings on Autumn Conference of Japan Fluid Power System Society 2025   77 - 79   2025.12  [Reviewed]

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (research society, symposium materials, etc.)   Single Work  

  • Power-Saving Drive of Electric-Pneumatic Hybrid Linear Actuator using Airtight Closed Circuit

    Irsham SAUDULLA, Yasukazu SATO

    The Proceedings on Autumn Conference of Japan Fluid Power System Society 2025   101 - 103   2025.12  [Reviewed]

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (research society, symposium materials, etc.)   Single Work  

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Review Papers 【 display / non-display

  • 「フルードパワーを活用した超高圧技術」発行にあたって

    佐藤 恭一

    フルードパワーシステム   55 ( 1 )   7 - 7   2024

    DOI CiNii Research

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher:一般社団法人 日本フルードパワーシステム学会   Single Work  

  • 磁気粘性流体の流動特性の省エネ制御

    佐藤 恭一

    油空圧技術   61 ( 3 )   31 - 35   2022.3

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Single Work  

  • JFPS2020函館における油圧分野の研究動向

    佐藤 恭一

    フルードパワーシステム   53 ( 2 )   67 - 70   2022

    DOI CiNii Research

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher:一般社団法人 日本フルードパワーシステム学会   Single Work  

  • 耐圧金属ベローズ使用の小型車両用空気ばね

    新堀武義, 佐藤恭一

    油空圧技術   60 ( 9 )   6 - 10   2021.9

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Single Work  

  • 油空圧制御機器の制御インターフェース

    佐藤恭一

    油空圧技術   59 ( 5 )   43 - 47   2020.5

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:日本工業出版   Single Work  

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Industrial Property Rights 【 display / non-display

  • 2方向移動検出方法,2方向移動検出装置,および2方向移動検出用ターゲット部材

    佐藤恭一

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    Applicant:国立大学法人横浜国立大学

    Application no:2008-193880  Date applied:2008.7

    Announcement no:2010-32321  Date announced:2010.2

    Country of applicant:Domestic  

  • 回転・直動2自由度モータ

    佐藤恭一

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    Applicant:横浜国立大学

    Application no:特願2006-144996  Date applied:2006.5

    Country of applicant:Domestic  

    固定子と,出力軸方向に移動可能に回転支持した回転子とを備え,前記固定子は,前記回転子の回転方向への起磁力を生成して回転子に対してトルクを発生させ,固定子の磁極が形成する出力軸の軸方向の磁束密度分布を制御して回転子に対して軸方向推力を発生させることを特徴とする,回転・直動2自由度モータ

  • 磁歪素子アクチュエータ

    佐藤恭一,佐藤泰雄

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    Applicant:よこはまティーエルオー株式会社,株式会社オーセンティック

    Application no:特願2005-118113  Date applied:2005.4

    Announcement no:特開2006-302937  Date announced:2006.11

    Country of applicant:Domestic  

    携帯型機器のディスプレイ装置等のような狭小機器又は小寸法機器に組み込むことができ,しかも,比較的高剛性の被駆動部材を駆動することができる磁歪素子アクチュエータを提供する.

  • APPARATUS AND METHOD FOR CONTROLLING DRIVING OG A HYDRAULIC CYLINDER OF HYDRAULIC PRESS EQUIPMENT

    Yasukazu Sato, Hirohisa Tanaka, Takeshi Nagata

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    Applicant:Nissinbo Industries, Inc.

    Application no:651997  Date applied:1996.6

    Publication no:5682742  Date published:1997.11

    Country of applicant:Foreign country  

  • 油圧プレス装置のラム駆動制御装置及び同駆動制御法

    佐藤恭一,田中裕久,永田武司

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    Applicant:日清紡株式会社

    Application no:特許出願平7-149651  Date applied:1995.5

    Announcement no:特許公開平8-309599  Date announced:1996.11

    Country of applicant:Domestic  

    油圧プレス装置のラム駆動制御に,2つの油圧動力源を用いて1つの油圧動力源によるシステムより消費動力を低減させる.

Awards 【 display / non-display

  • 公益財団法人 油空圧機器振興財団 論文顕彰

    2022.5   公益財団法人 油空圧機器振興財団   Improving the overall efficiency of an electro-hydraulic drive system by using efficiency maps

    Individual or group name of awards:Ha Tham PHAN,佐藤 恭一

  • 日本フルードパワーシステム学会学術論文賞

    2020.5   一般社団法人日本フルードパワーシステム学会   油圧機械式無段変速機の設計手法に関する研究

    Individual or group name of awards:佐藤恭一(横浜国立大学), 大内田剛史(ヤンマー株式会社)

  • 職業能力開発関係厚生労働大臣表彰 功労賞

    2017.11   厚生労働省 職業能力開発関係厚生労働大臣表彰   技能検定の推進

    Individual or group name of awards:佐藤 恭一

  • 日本機械学会機素潤滑設計部門業績賞

    2017.4   (一社)日本機械学会 機素潤滑設計部門   機素潤滑設計分野における学術研究,技術開発および先駆的研究の推進

    Individual or group name of awards:佐藤恭一

  • Outstanding Paper Award, The Japan Fluid Power System Society

    2008.9    

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Grant-in-Aid for Scientific Research 【 display / non-display

  • 非電磁式省動力界磁機構による磁気粘性流体の流動粘性制御システムの構築 研究課題

    2019.4 - 2022.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(C)

    Investigator(s):佐藤恭一

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    Grant type:Competitive


    磁気粘性流体(Magnetorheological Fluid,以下MR流体)は,そのレオロジー特性である粘性が外部から印加された磁界の強さに応じて変化する機能性流体である.本研究では,その磁界の制御に,電磁石のように電力を消費しない永久磁石を活用し,動力を消費することなしにMR流体の粘性を制御する技術基盤を確立し,MR流体を用いたブレーキ,クラッチへの適用により,省動力な動力変換・制御システムの構築を目指す.

  • 回転・直動二自由度モータのサーボシステムの構築

    2010.4 - 2013.3

    科学研究費補助金  Grant-in-Aid for Scientific Research(C)

    Investigator(s):佐藤恭一

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    Grant type:Competitive

Presentations 【 display / non-display

  • Development of a Highly Efficient Electro-Hydraulic Power Transmission System at the YNU Mechatronics and Fluid Power Laboratory

    Yasukazu Sato  [Invited]

    International Conference on Innovations in Fluid Power  2026.1  Department of Mechanical Engineering Indian Institute of Technology (ISM) Dhanbad

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    Event date: 2026.1

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Dhanbad   Country:India  

  • Application of Power-saving Technology to Fluid Power Motion Control

    K.Sato  [Invited]

    7th National Conference on Fluid Power, 

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    Event date: 2012.8

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Changchun, China  

Preferred joint research theme 【 display / non-display

  • 機能性材料,機能性流体のアクチュエータ応用

  • Research on Fluid Power Systems

  • Research on Electro-magnetic Actuator

 

Charge of on-campus class subject 【 display / non-display

  • 2026   Manufacturing of Integrated Systems A

    Graduate school of Engineering Science

  • 2026   Design of Integrated Systems B

    Graduate school of Engineering Science

  • 2026   Design of Integrated Systems A

    Graduate school of Engineering Science

  • 2026   Mechatronics Design

    Graduate school of Engineering Science

  • 2026   Prospects of Mech Eng, Mater Sci and Ocean Eng

    Liberal Arts Education

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Committee Memberships 【 display / non-display

  • 日本フルードパワーシステム基盤強化委員会

    2024.6  委員長

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    Committee type:Academic society 

  • 日本フルードパワーシステム学会

    2024.6 - 2026.6  副会長・理事

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    Committee type:Academic society 

  • 自動車技術会 International Journal of Automotive Engineering編集委員会

    2024.4  委員

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    Committee type:Academic society 

  • 日本フルードパワーシステム学会

    2020.5 - 2022.5  理事

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    Committee type:Academic society 

  • 自動車技術会CVT・ハイブリッド部門委員会

    2012.4  委員

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    Committee type:Academic society 

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Social Contribution(Extension lecture) 【 display / non-display

  • MATLABとメカトロニクス

    工学研究院  横浜国立大学  2006.9

  • MATLABと電磁アクチュエータ設計

    工学研究院  横浜  2005.9

  • メカトロニクスデザイン

    工学研究院  東京・田町  2004.12