Development of a Water Hydraulic Servovalve.

Urata, Eizo; Miyakawa, Shimpei; Yamashina, Chishiro; Nakao, Yohichi; Usami, Yuhichi; Shinoda, Masao

doi:10.1299/jsmeb.41.286

Cited by 31 publications

(21 citation statements)

References 5 publications

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“…To fulfill the needs, a valve structure, as depicted in the reference [7] was chosen. The valve had two hydrostatic bearings, each at the spool end.…”

Section: Structure and Featuresmentioning

confidence: 99%

“…If the spool is eccentric in the sleeve seen in the figure, the pocket pressure P3 on the lower side increases as the pocket pressure P1 on the upper side decreases. Each pocket pressure is determined from the Reynolds' equation when an eccentricity e is determined, then load carrying capacity of the bearing is also obtained [8]. A valve of direct drive type inherently has low damping effect to the spool movement compared with a valve of 2-stage type, such as a servovalve.…”

Section: Structure and Featuresmentioning

confidence: 99%

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Development of Water Hydraulic Proportional Control Valve

Takahashi

Yamashina

Miyakawa

1999

Proceedings of the JFPS International Symposium on Fluid Power

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“…To fulfill the needs, a valve structure, as depicted in the reference [7] was chosen. The valve had two hydrostatic bearings, each at the spool end.…”

Section: Structure and Featuresmentioning

confidence: 99%

Section: Structure and Featuresmentioning

confidence: 99%

Development of Water Hydraulic Proportional Control Valve

Takahashi

Yamashina

Miyakawa

1999

Proceedings of the JFPS International Symposium on Fluid Power

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“…This control algorithm can be easily applied to multicylinder systems. Figure 9 shows an example of the response waveforms to triangular-wave input under two-cylinder control [7]. The specifications of the cylinders used in this test are as follows: tube diameter is 63mm; rod diameter is 45mm; and stroke is 500mm.…”

Section: Outline Of Control Systemmentioning

confidence: 99%

Development of Water Hydraulic Cylinder1 Position Control System

Yamashina

Miyakawa

Urata

1996

Proceedings of the JFPS International Symposium on Fluid Power

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In this paper, the water hydraulic cylinder position control system, newly developed by authors, will be discussed.First, the outline of the water hydraulic servovalve and the components for cylinder position control system, as well as the points of control method of the water hydraulic system, are introduced. Next section discuses on the basic performance of the system: a horizontal cylinder position control; synchronizing control for two horizontal cylinders; and a basic performance of synchronizing control device which moves cylinders vertically. The control performance of these water hydraulic servo system is at the same level of that of the oil hydraulic servo system. For the synchronizing control for vertical cylinders, more practical issue, such as the in\uence of the eccentric load, is discussed.

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“…Water hydraulic motion control can be divided into three main sections: control valves, actuators and Servo valves are the most sophisticated control valves, which development has so far focused strongly to Japan [3]. The characteristics of present water hydraulic servo valves are good.…”

Section: Introductionmentioning

confidence: 99%

Water Hydraulics Motion Control-Possibilities and Challenges

Vilenius

Koskinen

Lakkonen

2002

Proceedings of the JFPS International Symposium on Fluid Power

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Water hydraulics is a growing technology area mainly due to environmental, safety and cleanness reasons. Water hydraulic systems have proved to be the best technology alternative in some industrial sectors such as food, processing, paper, steel and power industry. The main challenges for water hydraulics technology are proper design, good reliability and controllability at a reasonable price level. When these requirements are fulfilled, water hydraulic systems should be fully competitive to other systems. The objective of water hydraulics motion control research is to improve the controllability of the systems. This paper considers the current possibilities and challenges in water hydraulics motion control. Component technology is shortly discussed, including control valves and actuators. After the component technology, the present control methods in water hydraulics motion control are explained. The challenges in position, velocity and force control are exemplary described. Finally, two examples of new water hydraulic motion control systems are presented: Example 1. Positioning system with on/off valves, Example 2. Cavitation free proportional pressure relief valve for water systems.

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Development of a Water Hydraulic Servovalve.

Cited by 31 publications

References 5 publications

Development of Water Hydraulic Proportional Control Valve

Development of Water Hydraulic Proportional Control Valve

Development of Water Hydraulic Cylinder1 Position Control System

Water Hydraulics Motion Control-Possibilities and Challenges

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