scholarly journals Design, Mathematical Modeling and Force Control for Electro-Hydraulic Servo System With Pump-Valve Compound Drive

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 171988-172005
Author(s):  
Bin Yu ◽  
Qixin Zhu ◽  
Jing Yao ◽  
Junxiao Zhang ◽  
Zhipeng Huang ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Force Control ◽  
Servo System ◽  
Hydraulic Servo ◽  
Pump Valve ◽  
Hydraulic Servo System

Simulations and Experiments on the Force Control of Hydraulic Servo System for Hydraulic Robots

2016 ◽  
Vol 826 ◽  
pp. 128-133 ◽  
Author(s):  
Hyo Gon Kim ◽  
Jong Won Lee ◽  
Yong Ho Choi ◽  
Jeong Woo Park ◽  
Jin Ho Suh
Keyword(s):  
Force Control ◽  
High Performance ◽  
Control Method ◽  
Servo System ◽  
Force Density ◽  
Hydraulic Actuator ◽  
Underwater Robots ◽  
Heavy Load ◽  
Hydraulic Servo ◽  
Hydraulic Servo System

Because hydraulic actuator has higher power and force density, it is normally used in heavy load manipulator robots and industrial equipment which require high torque. Also, the hydraulic actuator is applied to underwater robots that need high performance maneuver in underwater operations. The force control has benefits to those kind of robots to ensure compliance with user or environment. However, the hydraulic actuator is difficult to control forces due to the non-linearity characteristic of the hydraulic servo system. In this paper, we propose a force control method with compensation of force derivative and natural velocity feedback. We also describe a method of applying it to the real system. In order to evaluate the effect of the proposed control method, the simulations and experiments were performed.

A method of designing a robust force controller of a water-hydraulic servo system

2002 ◽  
Vol 216 (2) ◽  
pp. 135-141 ◽  
Author(s):  
K Sanada
Keyword(s):  
Control Theory ◽  
Force Control ◽  
Weighting Function ◽  
Servo System ◽  
Plastic Layer ◽  
Robust Controller ◽  
The Press ◽  
Hydraulic Servo ◽  
Water Hydraulic ◽  
Hydraulic Servo System

Robust force control of a water-hydraulic servo system is discussed. The system treated in this paper is a model of a moulding press used for a fabrication process of large-scale integration packages. The whole surface of a wafer is covered with a thin plastic layer by the press. The performance of force control is important to obtain sufficient quality. The press is driven by a ram cylinder and a water-hydraulic servo valve. Considering the uncertainty caused by the flow characteristics of the valve in the overlap region and the mechanical stiffness of the press, a method of designing a robust force controller is proposed by applying H∞ control theory. Qualitative evaluation of modelling error is the key to the design of the robust controller. The performance of the robust controller is examined using an experimental water-hydraulic servo system set-up. It is illustrated how the system responses are influenced by the weighting function parameters of H∞ control theory.

Model predictive force control of hardware implementation for electro-hydraulic servo system

2018 ◽  
Vol 41 (5) ◽  
pp. 1435-1446 ◽  
Author(s):  
Mohamed El-Sayed M. Essa ◽  
Magdy AS Aboelela ◽  
MA Moustafa Hassan ◽  
SM Abdrabbo
Keyword(s):  
Fractional Order ◽  
Force Control ◽  
Hardware Implementation ◽  
Testing Machine ◽  
Servo System ◽  
Hydraulic Press ◽  
Performance Criteria ◽  
System Parameters ◽  
Hydraulic Servo ◽  
Hydraulic Servo System

This manuscript introduces the application of Model Predictive Control (MPC) for high force control precision in a real industrial electro-hydraulic servo system (EHSS). Moreover, it presents a fractional order control (FOC) and conventional controllers (CC) based on genetic algorithm (GA). The GA technique has been used to tune the parameters of FOC and CC approach. In order to verify the ability of the proposed controller applied to the hydraulic press machines emulator using EHSS, a hardware implementation of a test press system is also suggested and setup to be used in this research. As a result, the study has been investigated using a simulation model then verified via the experimental implementation. In fact, the EHSS plays an important role in many industrial applications, especially in flight simulators, aircraft landing gear system, material testing machine and hydraulic press machines for which the high accuracy and fast response of the force or pressure control are exceedingly necessary. Real-time experiments on the EHSS are carried out to evaluate the proposed control approach in a large system parameters variation of working environments. Considerable improvement in the performance generated by the designed MPC controller is compared with the traditional and fractional order controllers. Moreover, the results show that the performance criteria in terms of settling, rise times, system overshoots, system parameters variation and applying different test signals are good values in case of applying MPC over using FOC and CC in this study. As a general conclusion, one can conclude that the MPC has the priority of applying it in the field of the industrial EHSS. The obtained results are promising in the field of mechatronic.

Study of Hydraulic Servo System Based on Fuzzy Sliding Mode Algorithm

2013 ◽  
Vol 753-755 ◽  
pp. 2674-2678
Author(s):  
Kun Yang ◽  
Cai Jun Liu ◽  
Shu Min Liu
Keyword(s):  
Control Algorithm ◽  
Sliding Mode ◽  
Servo System ◽  
Time Varying ◽  
External Interference ◽  
System A ◽  
Hydraulic Servo ◽  
Fuzzy Sliding Mode ◽  
Hydraulic Servo System ◽  
Position Servo

Based on the situation that the hydraulic position servo system is easily influenced by the external interference and the parameters of which are different with time-varying, the fuzzy control can soften the buffeting and the sliding algorithm has no the same problems as the hydraulic position servo system, a brandly-new fuzzy sliding control algorithm is designed. In the simulation process, within the parameters of simulated time-varying and outside strong interference, the results show that the hydraulic servo system based on fuzzy sliding mode control algorithm has a greater resistance to internal and external interference and time-varying parameters.

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