scholarly journals PSEUDO-PROPORTIONAL POSITION CONTROL OF WATER HYDRAULIC CYLINDER USING ON/OFF VALVES

2002 ◽  
Vol 2002 (5-1) ◽  
pp. 155-160 ◽  
Author(s):  
Matti LINJAMA ◽  
Kari T. KOSKINEN ◽  
Matti VILENIUS
Keyword(s):  
Position Control ◽  
Hydraulic Cylinder ◽  
Water Hydraulic

Two-Way Solenoid Valves in Low-Pressure Water Hydraulics

2000 ◽  
Author(s):  
Matti O. Linjama ◽  
Jyrki O. Tammisto ◽  
Kari T. Koskinen ◽  
Matti J. Vilenius
Keyword(s):  
Pressure Range ◽  
Position Control ◽  
Hydraulic Cylinder ◽  
Low Pressure ◽  
Weak Point ◽  
Flow Capacity ◽  
Water Hydraulics ◽  
Pressure Water ◽  
Small Flow ◽  
Water Hydraulic

Abstract The paper tests experimentally the suitability of inexpensive directly operated two-way solenoid valves for water hydraulic applications in the pressure range from 10 to 40 bars. Seven valves are tested and tested matters include the steady-state and dynamic characteristics as well as durability. Results show small delays and the durability of about ten million openings. The weak point of the valves is a small flow capacity but otherwise the valves are well suited for low-pressure water hydraulic applications. This is demonstrated by using them in a simple on/off position control of a water hydraulic cylinder.

High-Speed On/Off Position Control of a Low-Pressure Water Hydraulic Cylinder Drive

2002 ◽  
Author(s):  
Matti Linjama ◽  
Harri Sairiala ◽  
Kari T. Koskinen ◽  
Matti Vilenius
Keyword(s):  
High Speed ◽  
Position Control ◽  
Hydraulic Cylinder ◽  
Low Pressure ◽  
Pressure Water ◽  
Water Hydraulic

Proportional Position Control of Low-Pressure Water Hydraulic Cylinder

2002 ◽  
Author(s):  
Harri Sairiala ◽  
Matti Linjama ◽  
Kari T. Koskinen ◽  
Matti Vilenius
Keyword(s):  
Position Control ◽  
Hydraulic Cylinder ◽  
Low Pressure ◽  
Pressure Water ◽  
Water Hydraulic

Sliding mode tracking control of a low-pressure water hydraulic cylinder under non-linear friction

2002 ◽  
Vol 216 (5) ◽  
pp. 383-392 ◽  
Author(s):  
S H Cho ◽  
M Linjama ◽  
H Sairiala ◽  
K T Koskinen ◽  
M Vilenius
Keyword(s):  
Tracking Control ◽  
Position Control ◽  
Sliding Mode ◽  
Hydraulic Cylinder ◽  
Low Pressure ◽  
Non Linear ◽  
Linear Friction ◽  
Pressure Water ◽  
Water Hydraulic ◽  
Mode Tracking

This paper deals with a robust motion control of a low-pressure water hydraulic cylinder under non-linear friction. In order to ensure good tracking performance as well as to guarantee robustness, the sliding mode tracking control is utilized in combination with a non-linear friction compensator. Application of the scheme to a low-pressure water hydraulic cylinder position control has led to a significant reduction in tracking error when compared with the perfect tracking control scheme.

scholarly journals POSITION CONTROL OF A WATER HYDRAULIC CYLINDER

1996 ◽  
Vol 1996 (3) ◽  
pp. 43-48 ◽  
Author(s):  
Kari T. KOSKINEN ◽  
Esa MÄKINEN ◽  
Matti J. VILENIUS ◽  
Tapio VIRVALO
Keyword(s):  
Position Control ◽  
Hydraulic Cylinder ◽  
Water Hydraulic

The Lower Extremity Exoskeleton Coordinated Control Method Based on Human Electromechanical Coupling

2012 ◽  
Vol 220-223 ◽  
pp. 1012-1017
Author(s):  
Qing Guo ◽  
Dan Jiang
Keyword(s):  
Lower Extremity ◽  
Electromechanical Coupling ◽  
Position Control ◽  
Control Method ◽  
Angular Displacement ◽  
Stability Margin ◽  
Hydraulic Cylinder ◽  
Load Force ◽  
Hydraulic Cylinders ◽  
Coupling Characteristics

This paper has introduced electromechanical coupling characteristics in the lower extremity exoskeleton systems, considered model ,according to legs supporting gait when people walking, established the load torque compensation model , and a mathematical model of knee position control system which is made of the servo valve, hydraulic cylinders and other hydraulic components, designed hydraulic cylinder position control loop in case of existing load force interference compensation, and used the method of combining the PID and lead correction network for frequency domain design ,ensured system to meet a certain stability margin. The simulation results show that this position control method can servo on the knee angular displacement of normal human walking, reached a certain exoskeleton boost effect, at the same time, met the needs of human-machine coordinated motion.

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