scholarly journals HYDRAULIC SERVO SYSTEM USING A FEEDBACK LINEARIZATION CONTROLLER AND DISTURBANCE OBSERVER

2008 ◽  
Vol 2008 (7-2) ◽  
pp. 307-312 ◽  
Author(s):  
Ill-yeong LEE ◽  
Tae-hyung KIM ◽  
Sae-ryung CHOI
Keyword(s):  
Feedback Linearization ◽  
Disturbance Observer ◽  
Servo System ◽  
Hydraulic Servo ◽  
Hydraulic Servo System

Suppression of Micro Stick-Slip Vibrations in Hydraulic Servo-System

1998 ◽  
Vol 122 (2) ◽  
pp. 249-256 ◽  
Author(s):  
Toshiyuki Hayase ◽  
Satoru Hayashi ◽  
Kazunori Kojima ◽  
Ikuro Iimura
Keyword(s):  
Feedback Linearization ◽  
Servo System ◽  
Hydraulic Cylinder ◽  
Feedback Gain ◽  
Stick Slip ◽  
Servo Valve ◽  
Wide Range ◽  
Order Of Magnitude ◽  
Hydraulic Servo ◽  
Hydraulic Servo System

This paper deals with suppression of two kinds of micro stick-slip vibrations occurring in a typical computer-controlled hydraulic servo-system. The relevant system consists of a single-rod hydraulic cylinder, an electrohydraulic servo-valve and a personal computer. The discontinuous control signal from a D/A converter causes a stick-slip vibration of micron order of magnitude over a wide range of the feedback gain. Increasing the feedback gain results in the other stick-slip vibration of nearly ten times larger amplitude due to the nonlinear pressure-flow characteristic of the servo-valve. The numerical simulation revealed the latter micro stick-slip vibration could be efficiently suppressed with the feedback linearization technique to compensate the nonlinearity of the servo-valve, while the former one reduced by improving the resolution of the D/A converter. Validities of both the methods were also confirmed with experiment. [S0022-0434(00)00102-7]

scholarly journals Research on Feedback-Linearized Sliding Mode Control of Direct-Drive Volume Control Electro-Hydraulic Servo System

Processes ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1676
Author(s):  
Gexin Chen ◽  
Pengshuo Jia ◽  
Guishan Yan ◽  
Huilong Liu ◽  
Wenbin Chen ◽  
...  
Keyword(s):  
Sliding Mode Control ◽  
Feedback Linearization ◽  
Sliding Mode ◽  
External Disturbance ◽  
Servo System ◽  
Structure Theory ◽  
Volume Control ◽  
Mode Control ◽  
Hydraulic Servo ◽  
Hydraulic Servo System

In this paper, a control strategy combining the feedback linearization theory and sliding mode variable structure theory is proposed to solve various nonlinear factors, uncertainty of external disturbance and high-precision pressure control problems in the Direct-Drive Volume Control (DDVC) electro-hydraulic servo system. The nonlinear mathematical model of the DDVC electro-hydraulic servo system is established, and the nonlinear factors in the system are accurately linearized by the feedback linearization theory. The uncertainty of external disturbance in the system is compensated by the sliding mode control variable structure theory. The feedback-linearized sliding mode control algorithm proposed in this paper is verified using the DDVC electro-hydraulic servo system experimental platform. The experimental results show that, compared with the classical PID control, the proposed control algorithm can effectively improve the pressure output precision, as well as the dynamic response characteristics, of the DDVC system.

Hydraulic Servo System With Mechanically Adjustable Compliance

1999 ◽  
Vol 124 (1) ◽  
pp. 168-175 ◽  
Author(s):  
Toshiyuki Hayase ◽  
Kazuhiro Ishizawa ◽  
Satoru Hayashi ◽  
Ikuro Iimura
Keyword(s):  
Numerical Simulation ◽  
Feedback Linearization ◽  
Servo System ◽  
Human Interaction ◽  
Present System ◽  
Neutral Position ◽  
Nonlinear Controller ◽  
Operating Condition ◽  
Hydraulic Servo ◽  
Hydraulic Servo System

This paper deals with a hydraulic servo system with compliance control for the operation in an environment with frequent machine-human interaction. The compliance is mechanically adjusted in the present hydraulic system by changing the neutral position of the bridge valves between the full opening and the full closing states. The mathematical model of the system is first derived, and the static and the dynamic behavior of the system are investigated through numerical simulation. Since the present system exhibits a strong nonlinear characteristic in the operating condition of large compliance, a nonlinear controller is designed with the feedback linearization technique. In the operating condition of small compliance, on the other hand, a conventional linear control is applicable as usual hydraulic control systems. The performance of the present control system is investigated through both numerical simulation and experiment, justifying that the present hydraulic servo system continuously adapts its performance between a rigid positioning against disturbances and a compliant positioning to prevent damage to obstacles on the path.

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