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Application of Simple Adaptive Control to Water Hydraulic Servo Cylinder System

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Chinese Journal of Mechanical Engineering 2012年第5期25卷 882-888页

作者： ito kazuhisa YAMADA Tsuyoshi IKEO Shigeru TAKAHASHI Koji College of Systems Engineering and Science Shibaura Institute of Technology Saitama 3378570 Japan Graduate School of Mechanical Engineering Tottori UniversityTottori 6808552 Japan Department of Mechanical Engineering Sophia UniversityTokyo 1028554 Japan

Although conventional model reference adaptive control （MRAC） achieves good tracking performance for cylinder control, the controller structure is much more complicated and has less robustness to disturbance in real applications. This paper discusses the use of simple adaptive control （SAC） for positioning a water hydraulic servo cylinder system. Compared with MRAC, SAC has a simpler and lower order structure, i.e., higher feasibility. The control performance of SAC is examined and evaluated on a water hydraulic servo cylinder system. With the recent increased concerns over global environmental problems, the water hydraulic technique using pure tap water as a pressure medium has become a new drive source comparable to electric, oil hydraulic, and pneumatic drive systems. This technique is also preferred because of its high power density, high safety against fire hazards in production plants, and easy availability. However, the main problems for precise control in a water hydraulic system are steady state errors and overshoot due to its large friction torque and considerable leakage flow. MRAC has been already applied to compensate for these effects, and better control performances have been obtained. However, there have been no reports on the application of SAC for water hydraulics. To make clear the merits of SAC, the tracking control performance and robustness are discussed based on experimental results. SAC is confirmed to give better tracking performance compared with PI control, and a control precision comparable to MRAC （within 10 μm of the reference position） and higher robustness to parameter change, despite the simple controller. The research results ensure a wider application of simple adaptive control in real mechanical systems.

关键词： water hydraulics servo cylinder system positioning control simple adaptive control

State feedback stabilization of cascaded nonlinear systems with discontinuous connection

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控制理论与应用（英文版） 2008年第1期6卷 45-52页

作者： Maiko HIRANO Tielong SHEN kazuhisa ito Katutoshi TAMURA Department of Mechanical Engineering Sophia University Tokyo 102-8554 Japan Department of Mechanical Engineering Tottori University Tottori 680-8552 Japan

In practical engineering, many phenomena are described as a discontinuous function of a state variable, and the discontinuity is usually the main reason for the degradation of the control performance. For example, in the set-point control problem of mechanical systems, the static friction （described by a sgn function of velocity of the contacting faces） causes undesired positioning error. In this paper, we will investigate the stabilization problem for a class of nonlinear systems that consist of two subsystems with cascaded connection. We will show the basic idea with a special case first, and then the result will be extended to more general cases. Some interesting numerical examples will be given to demonstrate the effectiveness of the proposed design approach.

关键词： Cascaded connection Discontinuous systems Filippov solution

Nonlinear Robust Velocity Control of Water Hydraulic Servomotor System

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Nonlinear Robust Velocity Control of Water Hydraulic Servomo...

Development of Passive-Type Pressure Intensifier for Tap-Water Drive Systems

第二十二届中国控制会议

作者： kazuhisa ito Research Associate Department of Mechanical EngineeringSophia University Kioicho 7-1 ChiyodakuTokyo 1028554Japan

＜正＞This paper deals with the rotational velocity control of a water hydraulic servomotor system. Water hydraulic servo system is attractive technology for safety environment. Considering the parameter uncertainties, e.g. load fluctuation, friction parameters, parameter estimation error etc., a method of Lyapunov-based recursive design is applied to construct a robust rotational velocity controller. The proposed controller ensures that the set to which state error approaches to can be made arbitrary small by choosing the control gain. This is called the uniformly ultimate bounded stability. The effectiveness of the proposed controller is examined numerically.

关键词： Water hydraulic servomotor Velocity control Nonlinear system Parameter uncertainty Robust control Lyapunov recursive design

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Development of Passive-Type Pressure Intensifier for Tap-Wat...

Application of simple adaptive control to water hydraulic servo cylinder system

第九届全国流体传动与控制学术会议（9th FPTC-2016）

作者： Wataru Kobayashi Shujiro Dohta Tetsuya Akagi kazuhisa ito Okayama University of Science

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材料与冶金学报 2010年第4期9卷 300-303页

作者： Tsuyoshi YAMADA kazuhisa ito Shigeru IKEO Masaharu NISHIMURA Graduate School of Engineering Tottori University 4 - 101 Minami Koyama - cho Tottori Japan Department of Machinery ＆ Control Systems College of Systems Engineering and Science Shibaura Institute of Technology 307 Fukasaku Saitama Japan Department of Mechanical Engineering Sophia University 7 - 1 Kioicho Chiyodaku Tokyo Japan

In this research, the positioning control of water hydraulic servo cylinder system with the simple adaptive control (SAC) is discussed. Conventional model reference adaptive control (MRAC) also achieves good tracking performance for cylinder control, but the controller structure was much complicated and was not easy to be realized in application. Compared with MRAC, SAC has simpler and lower order structure, i.e., has higher feasibility. But only few papers concerning with the application of the control performance of SAC to hydraulics and pneumatics are available, especially for water hydraulics. In this paper, we will examine and evaluate the control performance of the SAC strategy and it is confirmed that SAC gives better tracking performance compared with PI control.

关键词： water hydraulics servo cylinder system position control simple adaptive control

Challenging situation of coronary artery anomaly associated with ischemia and/or risk of sudden death

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World Journal of Cardiology 2024年第4期16卷 173-176页

作者： Shigenori ito Division of Cardiology Sankuro HospitalToyota 471-0035Japan

Coronary artery anomaly is known as one of the causes of angina pectoris and sudden death and is an important clinical entity that cannot be *** incidence of coronary artery anomalies is as low as 1%-2%of the general population,even when the various types are *** anomalies are practically challenging when the left and right coronary ostium are not found around their normal positions during coronary angiography with a *** there is atherosclerotic stenosis of the coronary artery with an anomaly and percutaneous coronary intervention(PCI)is required,the suitability of the guiding catheter at the entrance and the adequate back up force of the guiding catheter are *** level of PCI risk itself should also be considered on a caseby-case *** this case,emission computed tomography in the R-1 subtype single coronary artery proved that ischemia occurred in an area where the coronary artery was not visible to the naked *** follow-up would be crucial,because sudden death may occur in single coronary *** prevent atherosclerosis with full efforts is also important,as the authors indicated admirably.

关键词： Coronary artery anomaly Single coronary artery Ischemia Sudden death Percutaneous coronary intervention Coronary vessel anomalies Myocardial ischemia Sudden cardiac death

Bicuspidization Using the Open-Sleeve Technique for Congenital Aortic Stenosis during Infancy

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Congenital Heart Disease 2024年第2期19卷 177-183页

作者： Toshi Maeda Hiroki ito Keiichi Hirose Kisaburo Sakamoto Departments of Cardiovascular Surgery Mt.Fuji Shizuoka Children’s HospitalShizuoka420-8660Japan

Congenital aortic stenosis(cAS)frequently requires intervention during the neonatal or infantile ***,surgical repair is challenging because of the narrow surgical *** performed bicuspidization using the open-sleeve technique for cAS with a unicuspid aortic valve in two ***,the patients were doing well without reintervention for the aortic valve for 8 and 6 years,*** aortic annular diameter increased along with somatic *** for neonates or infancy can be performed safely using the open-sleeve technique as its midterm results have been satisfactory.

关键词： Aortic valve repair infant bicuspidization open-sleeve technique

1,3-Dipolar Cycloaddition of Polycyclic Aromatic Azomethine Ylides and Alkynylbenziodoxoles for Synthesis of Functional Dibenzoullazines

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Chinese Journal of Chemistry 2024年第10期42卷 1079-1083页

作者： Hui Han Glen Wee Zhuan Goh Yongxin Li Naohiko Yoshikai Shingo ito Schoolof Chemistry ChemicalEngineering and BiotechnologyNanyang Technoogical University21 Nanyang LinkSingapore 637371Singapore Graduate School of Pharmaceutical Sciences Tohoku UniversitySendai 980-8578Japan

A new family of dibenzoullazine derivatives was synthesized through 1,3-dipolar cycloaddition of polycyclic aromatic azomethine ylides with alkynylbenziodoxoles followed by *** benziodoxole moiety in the resulting products was used as a versatile linchpin for the synthesis of structurally diverse functional dibenzoullazines that are difficult to access by other synthetic methods.

关键词： Cycloaddition Nitrogen heterocycles Azomethine ylides Hypervalent compounds Dibenzoullazine

Roles of N-cadherin in cerebral cortical development:cooperation with membrane trafficking and actin cytoskeletal regulation

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Neural Regeneration Research 2025年第1期20卷 188-190页

作者： Shiho ito Takeshi Kawauchi Department of Adaptive and Maladaptive Responses in Health and Disease Graduate School of MedicineKyoto UniversityKyotoJapan Department of Physiology Keio University School of MedicineTokyoJapan

Cell adhesion plays pivotal roles in the morphogenesis of multicellular *** cells form several types of cell-to-cell adhesion,including zonula occludens(tight junctions),zonula adhaerens(adherens junctions),and macula adhaerens(desmosomes).Although these adhesion complexes are basically observed only in epithelial cells,cadherins,which are the major cell adhesion molecules of adherens junctions,are expressed in both epithelial and non-epithelial tissues,including neural tissues(Kawauchi,2012).The cadherin superfamily consists of more than 100 members,but classic cadherins.

关键词： cerebral skeletal cooperation