scholarly journals Position control of hydraulic cylinder using constant pressure system

2003 ◽  
Vol 34 (5) ◽  
pp. 99-105
Author(s):  
Weidong MA ◽  
Shigeru IKEO
Keyword(s):  
Position Control ◽  
Constant Pressure ◽  
Hydraulic Cylinder ◽  
Pressure System

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.

Development of New Power Line Driven by Constant Pressure System

2002 ◽  
Author(s):  
Hiroyuki Sugawara ◽  
Ken Ichiryu ◽  
Yutaka Kondoh ◽  
Takamichi Abe
Keyword(s):  
Constant Pressure ◽  
Power Line ◽  
Pressure System

Nonlinear Position Control of Digital Hydraulic Cylinder Despite Disturbance

2014 ◽  
Vol 998-999 ◽  
pp. 638-641
Author(s):  
Shi Jie Xu ◽  
J.F. Xing ◽  
Li Kun Peng
Keyword(s):  
Control System ◽  
Lyapunov Function ◽  
Linear Matrix Inequality ◽  
Nonlinear Model ◽  
Position Control ◽  
Hydraulic Cylinder ◽  
Linear Matrix ◽  
Matrix Inequality ◽  
Nonlinear Controller ◽  
Position Control System

A nonlinear controller is presented for a digital hydraulic cylinder against disturbance. We first establish the nonlinear model of digital hydraulic cylinder position control system. Then a Lyapunov function and a nonlinear controller are presented. The controller designing problem is translated into the problem of solving a linear matrix inequality. The experiment results show that the controller proposed by this paper has much better performance than traditional one.

Turbocharged Two-Stroke-Cycle Gas Engines

1965 ◽  
Vol 87 (4) ◽  
pp. 421-438
Author(s):  
M. L. Land ◽  
Alex Carameros
Keyword(s):  
High Altitude ◽  
Sea Level ◽  
Thermal Loading ◽  
Constant Pressure ◽  
Successful Operation ◽  
Pressure System ◽  
Start Up ◽  
Load Carrying ◽  
History Of ◽  
Stroke Cycle

Pulse turbocharging, which had a long history of successful operation in sea-level installations on two-stroke-cycle gas engines, did not give satisfactory results at high altitude as evidenced by increased thermal loading and reduced load-carrying ability. Proper application of the constant-pressure system overcame these difficulties. The underlying theory explaining these results, supported by factory and field developments, is given in this paper. Start-up, operational, and maintenance experiences are given on constant-pressure-turbocharged, two-cycle, uniflow engines at high altitude.

Simulation and Analysis on Main Synchronized Hydraulic Cylinder of Huge Hydraulic Press

2012 ◽  
Vol 233 ◽  
pp. 150-153
Author(s):  
Jin Yu ◽  
Ming Zhen Fan ◽  
Guo Qin Huang ◽  
Min Yu
Keyword(s):  
Closed Loop ◽  
Position Control ◽  
Response Speed ◽  
Hydraulic Cylinder ◽  
Hydraulic Press ◽  
Loop Control ◽  
Piston Cylinder ◽  
The Press ◽  
Hydraulic Cylinders ◽  
Position Control System

Nowadays, huge hydraulic press plays an important role in the heavy industry. The synchronized hydraulic cylinder is the key component, which will affect the performance of the press. Thus, a thorough investigation to the main cylinder is required. In this paper, a mathematical model was built for the position closed-loop control of active synchronous hydraulic cylinders, and transfer function of the corresponding single cylinder was deduced. Simulation and calibration of the working cylinder servo position control system was accomplished with MATLAB, so as to improve the response speed and stability of the single working cylinder system. The results showed that a single hydraulic piston cylinder had a better position control features, which offered a theory basis for the design of the main drivers of forging hydraulic machine synchronization system.

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