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Journal articles on the topic 'Hydraulic servo system'

Author: Grafiati

Published: 4 June 2021

Last updated: 21 February 2023

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1

Zhu, Jin Fang. "Design of an Experimental Platform for Hydraulic Servo System." Applied Mechanics and Materials 69 (July 2011): 51–54. http://dx.doi.org/10.4028/www.scientific.net/amm.69.51.

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VRLA (valve-regulated lead-acid) and Pump-control are the two kinds of power components for hydraulic servo system. With different command device, feedback measurement device and different corresponding electronic components, the hydraulic servo systems are different. To ensure maximum performance of the whole device, the overall design (including mechanical, electrical design) should be considered for hydraulic servo system. Machinery-electric-hydraulic should be in coordination with each other. The hydraulic system components are used to change the speed of hydraulic cylinder and alter direction of hydraulic cylinder and hydraulic motor. The solenoid valve for motor and hydraulic servo system and the control of pressure relay can implement by the electric section.

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2

Xia, Lian, Yang Xiao, Gui Shan Li, Hua Zhai, and Jiang Han. "Research of New Servo-Hydraulic Press Based on the AC Servo Motor Control." Key Engineering Materials 522 (August 2012): 542–45. http://dx.doi.org/10.4028/www.scientific.net/kem.522.542.

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Servo-hydraulic press is a kind of hydraulic press which has feedback device and can detect and feedback signals. Nowadays traditional servo-hydraulic press based on proportion-al servo valve control has been often used,but the study of this article is a new servo-hydraulic press based on the AC servo motor control. In this article, the hydraulic system of new servo-hydraulic press,and the electrical control system including the hardware component and software system have been mainly designed.

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3

OOKUBO, Naruhiko, Shigeki MIURA, Shigeru IKEO, Yasuo SAKURAI, and Koji TAKAHASHI. "CHARACTERISTICS OF WATER HYDRAULIC SERVO SYSTEM." Proceedings of the JFPS International Symposium on Fluid Power 1999, no. 4 (1999): 715–20. http://dx.doi.org/10.5739/isfp.1999.715.

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4

HAYASE, Toshiyuki, Kazuhiro ISHIZAWA, Satoru HAYASHI, and Ikuro IIMURA. "Hydraulic Servo System with Variable Compliance." Transactions of the Japan Society of Mechanical Engineers Series C 64, no. 621 (1998): 1588–95. http://dx.doi.org/10.1299/kikaic.64.1588.

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5

Chiang, Mao Hsiung, Chung Chieh Cheng, Liang Wang Lee, Maoh Chin Jiang, and Jhih Hong Lin. "Signed-Distance Fuzzy Sliding Mode Position Control for an Energy-Saving Electro-Hydraulic Control System." Applied Mechanics and Materials 284-287 (January 2013): 2315–19. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.2315.

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Electro-Hydraulic pump-controlled servo systems that have high energy-efficiency can serve as energy-saving system. This paper aims to investigate the servo performance of the electro-hydraulic pump-controlled systems driven by an AC servo motor with variable rotational speed. A constant displacement axial piston pump is used in this research. Thus, the new hydraulic pump-controlled system with an AC motor servo and a constant displacement axial piston pump is investigated for position control of hydraulic servo machines. For that, this paper also develops the control strategy, sign-distance fuzzy sliding mode control, which can simplify the fuzzy rule base through the sliding surface. The developed high response variable rotational speed pump-controlled systems controlled by SD-FSMC are implemented and verified experimentally for positioning control in different stroke and loading conditions.

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6

Hayase, Toshiyuki, Kazuhiro Ishizawa, Satoru Hayashi, and Ikuro Iimura. "Hydraulic Servo System With Mechanically Adjustable Compliance." Journal of Dynamic Systems, Measurement, and Control 124, no. 1 (April 14, 1999): 168–75. http://dx.doi.org/10.1115/1.1433803.

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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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7

Feng, Jing Chang, Xiang Dong Kong, Jin Zhang, Li Juan Wang, and Chun Qing Liu. "Analysis of Hydraulic Press Servo System Based on Robust Controller." Applied Mechanics and Materials 644-650 (September 2014): 421–28. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.421.

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This paper researches and analyzes the modeling of electro-hydraulic proportional servo system to improve the characteristics of forging hydraulic servo control system and meet their requirements of forging a variety of materials. Based on robust compensator design, PID control strategy is proposed with uncertain disturbance of hydraulic press hydraulic servo system and the response characteristics of the system is simulated and analyzed. The results show that hydraulic press servo system which uses robust compensator has better performance than the traditional PID control and the chattering is eliminated. The test results and simulation results are compared by building simulation test system of 60MN hydraulic press electro-hydraulic proportional control system.

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8

Guo, Ying-Qing, Xiu-Mei Zha, Yao-Yu Shen, Yi-Na Wang, and Gang Chen. "Research on PID Position Control of a Hydraulic Servo System Based on Kalman Genetic Optimization." Actuators 11, no. 6 (June 15, 2022): 162. http://dx.doi.org/10.3390/act11060162.

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With the wide application of hydraulic servo technology in control systems, the requirement of hydraulic servo position control performance is greater and greater. In order to solve the problems of slow response, poor precision, and weak anti-interference ability in hydraulic servo position controls, a Kalman genetic optimization PID controller is designed. Firstly, aiming at the nonlinear problems such as internal leakage and oil compressibility in the hydraulic servo system, the mathematical model of the hydraulic servo system is established. By analyzing the working characteristics of the servo valve and hydraulic cylinder in the hydraulic servo system, the parameters in the mathematical model are determined. Secondly, a genetic algorithm is used to search the optimal proportional integral differential (PID) controller gain of the hydraulic servo system to realize the accurate control of valve-controlled hydraulic cylinder displacement in the hydraulic servo system. Under the positioning benchmark of step signal and sine wave signal, the PID algorithm and the genetic optimized PID algorithm are compared in the system simulation model established by Simulink. Finally, to solve the amplitude fluctuations caused by the GA optimized PID and reduce the influence of external disturbances, a Kalman filtering algorithm is added to the hydraulic servo system to reduce the amplitude fluctuations and the influence of external disturbances on the system. The simulation results show that the designed Kalman genetic optimization PID controller can be better applied to the position control of the hydraulic servo system. Compared with the traditional PID control algorithm, the PID algorithm optimized by genetic algorithm improves the system’s response speed and control accuracy; the Kalman filter is a good solution for the amplitude fluctuations caused by GA-optimized PID that reduces the influence of external disturbances on the hydraulic servo system.

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9

Wang, Xin Ge, Lei Li, Xiu Ling Wei, Gui Qin Chen, and Bing Feng Liu. "Electro-Hydraulic Servo Actuator Fuzzy Self-Tuning PID Control Research." Applied Mechanics and Materials 607 (July 2014): 795–98. http://dx.doi.org/10.4028/www.scientific.net/amm.607.795.

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According to the different working state of electro-hydraulic servo actuator servo system, the design parameter self-tuning three-dimensional fuzzy controller, the automatic setting of 3 d quantization factor and scaling factor of the fuzzy controller, the fuzzy control system can enhance the ability to adapt and tracking performance, improve the quickness of electro-hydraulic servo actuator servo system, reduces the overshoot of the electro-hydraulic servo actuator servo system, and rapidity and control accuracy to meet the electro-hydraulic servo actuator servo system dynamic performance and static performance requirements.

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10

MATSUI, Takashi, and Hidetoshi KOSEKI. "MOTION CONTROL OF WATER-HYDRAULIC SERVO SYSTEM." Proceedings of the JFPS International Symposium on Fluid Power 1996, no. 3 (1996): 61–66. http://dx.doi.org/10.5739/isfp.1996.61.

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11

Zhang, Fei. "ADAPTATION COMPENSATION OF HYDRAULIC SERVO CONTROL SYSTEM." Chinese Journal of Mechanical Engineering 41, no. 05 (2005): 94. http://dx.doi.org/10.3901/jme.2005.05.094.

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12

NABAE, Hiroyuki, Yuki KUSAKABE, Toru IDE, Yoshiharu HIROTA, Kiyoshi INOUE, and Koichi SUZUMORI. "Tough hydraulic Servo System Using Remote Sensing." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2016 (2016): 1P1–09b5. http://dx.doi.org/10.1299/jsmermd.2016.1p1-09b5.

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13

TERASAKA, Dai, Kazuhisa ITO, and Shigeru IKEO. "527 Study on Water Hydraulic Servo System." Proceedings of Yamanashi District Conference 2001 (2001): 173–74. http://dx.doi.org/10.1299/jsmeyamanashi.2001.173.

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14

Huang, Da Zhi, Qing Gui Zhou, Yuan Liang Zhang, and Jin Song Chen. "Electro-Hydraulic Servo Road Simulation System Based on Fuzzy Control." Advanced Materials Research 681 (April 2013): 214–18. http://dx.doi.org/10.4028/www.scientific.net/amr.681.214.

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The indoor road simulation test system test cycle is short, good reproducibility of the test results, confidentiality, etc., more and more attention in the vehicle industry. Analyzed by electro-hydraulic servo system of road simulation servo amplifier, electro-hydraulic servo valve, hydraulic cylinder and countertops and displacement transducer, The mathematical model of the system is established. The fuzzy model that comply with control law is designed. By unit step response simulation experiments, it is to be verified that the fuzzy control electro-hydraulic servo road simulation system is able to work better. It is a new attempt in roads simulation control strategy.

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15

Zhou, Li, Xin Hua Jiang, and Yan Liu. "Fault Modeling for Electro-Hydraulic Servo System Based on Hybrid System." Advanced Materials Research 472-475 (February 2012): 169–73. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.169.

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A parametric fault model of electro-hydraulic servo system based on hybrid system and multiple linear regression model was put forward. First of all, the operating condition of electro-hydraulic servo system was abstracted to discrete states, then using multiple linear regression algorithm, the model parameter were identified based on the statistical analysis of sample data. Finally, an electro-hydraulic servo system fault model was constructed combining the fault parameter. Compared to the previous fault model based on experimental modeling method, this model was constructed based on pressure, flow rate sensor data fusion, two parameters are correlated in the base layer, which can effectively improve the diagnostic decision robustness. The parametric fault monitoring and diagnosis experimental showed the effectiveness in fault monitoring.

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16

Mohammed, Jamal AK, Walaa M. Hashim, and Bahaa S. Beram. "Performance Improvement of a Conventional Hydraulic Elevator by Using Electro-Hydraulic Servo Mechanism." Engineering and Technology Journal 38, no. 5A (May 25, 2020): 748–60. http://dx.doi.org/10.30684/etj.v38i5a.367.

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An electro-hydraulic elevator is a new type of enhanced elevators that are used in low-rise buildings that do not exceed more than three floors. In this paper, an electro-hydraulic servo system for controlling the speed of a hydraulic elevator prototype by using a proportional valve and PID controller was investigated theoretically and experimentally. A three floors elevator prototype model with 76cm height was built including hydraulics components and electrical components. The elevator system is fully automated using the Arduino UNO board based Data Acquisition (DAQ) system. LabVIEW software is used to control the hydraulic elevator system through L298 DC drive via the DAQ board. The best PID gains was obtained experimentally. The elevator system prototype could be emplimented for educational purposes; such as learning the undergraduate students in the Electromechanical Engineering Department in the University of Technology how to structuring the electro-hydraulic elevator as well as the appropriate control strategy.

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17

Duan, Heng, and Zhang Yong Wu. "Single Stand Reversing Mill Steel Belt Running Deviation System Analysis and Simulation." Applied Mechanics and Materials 741 (March 2015): 730–33. http://dx.doi.org/10.4028/www.scientific.net/amm.741.730.

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This paper mainly analyzes the single stand reversible rolling mill strip wandering mathematical model of electro-hydraulic servo system using MATLAB/Simulink and constructs electro hydraulic servo control system model. It carries on the simulation analysis of the quality of the electro-hydraulic servo system. Through the study of strip running deviation design of servo system , we understand of the principle of design of electro-hydraulic servo hydraulic system and the MATLAB simulation.

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18

Wang, Xuan, Hong Mei Liu, and Chen Lu. "Health Assessment of Hydraulic Servo System Based on Fractal Analysis and Gaussian Mixture Model." Applied Mechanics and Materials 764-765 (May 2015): 703–7. http://dx.doi.org/10.4028/www.scientific.net/amm.764-765.703.

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A hydraulic servo system is a typical feedback control system. Health assessment of a hydraulic servo system is usually difficult to realize when traditional methods based on sensor signals are utilized. An approach for health assessment of hydraulic servo systems based on multi-fractal analysis and Gaussian mixture model (GMM) is proposed in this study. A GRNN neural network is employed to establish a fault observer for the hydraulic servo system. The observer is utilized to simulate the system output under normal state. The residue is then generated by subtracting the estimated output from the actual output. The residue’s feature is extracted by fractal analysis. After the feature extraction, the overlap between the current feature vectors and the normal feature vectors is obtained by applying GMM. The confidence value (CV) can be obtained in advance; this value is employed to characterize the health degree of the current state and consequently implement the health assessment of the hydraulic servo system. Lastly, two common types of fault, namely, burst and gradual, are applied to validate the effectiveness of the proposed method.

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19

Liu, Xiu Juan, Yan Chun Liu, Yue Ming Yang, Kai Zhao, and Yi Zhu. "Fuzzy PID Control of Materials Testing Machine Electrical Hydraulic Servo System." Advanced Materials Research 765-767 (September 2013): 1873–76. http://dx.doi.org/10.4028/www.scientific.net/amr.765-767.1873.

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Material experiment system of hydraulic servo system is subject to load disturbance and load disturbance is a function of standard mechanical parameters of rock samples. Rock mass is very discrete, anisotropy, composition is not single and inelastic[. Traditional tester can't get the complete stress-strain curve of rock[ material, in order to solve the shortage of the traditional hydraulic servo system, in this paper, the fuzzy PID control is successfully applied to the hydraulic servo system, through the experiments and get good effect.

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20

Zhang, Zhu Xin, and Tuo Jia. "Direct-Drive Differential Volume Control Electro-Hydraulic Servo Control System." Applied Mechanics and Materials 433-435 (October 2013): 991–94. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.991.

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Direct-drive volume control electro-hydraulic servo control system, derivation model of single-rod hydraulic cylinder system, pointed out that when the reciprocating motion characteristics are inconsistent. In order to solve this problem, proposed direct-drive differential volume control electro-hydraulic servo system design of its control system and analysis of system models. Through theoretical analysis, validate this proposed direct-drive bad dynamic volume control system, symmetric dynamic performance, improving control system reliability.

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21

Heinken, Helge, Stephan Ulrich, Rainer Bruns, and Steffen Schneider. "High-response electrorheological servo valve." Journal of Intelligent Material Systems and Structures 31, no. 2 (September 15, 2019): 297–307. http://dx.doi.org/10.1177/1045389x19873427.

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The demand of more powerful and high-dynamic hydraulic actuators gives the servo valve as a control member an increasingly important role. The valve should provide the hydraulic actuator with sufficient volume flow over wide frequency range to achieve large strains at high operating frequencies. Here, the electrorheological effect as an electrohydraulic valve drive offers great potential. It converts the electrical input signal directly into a controlling mechanical quantity within a few milliseconds and provides theoretically unlimited strain. Thus, the electrorheological effect has the ability to increase the performance of conventional hydraulic systems. This work presents a two-stage servo valve with an electrorheological pilot stage. Furthermore, it introduces a model to describe the static and dynamic properties of the system. The model is validated on the basis of measurement results.

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22

Yan, Guishan, Zhenlin Jin, Tiangui Zhang, Cheng Zhang, Chao Ai, and Gexin Chen. "Exploring the Essence of Servo Pump Control." Processes 10, no. 4 (April 16, 2022): 786. http://dx.doi.org/10.3390/pr10040786.

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The electrohydraulic servo variable speed volume pump control system (hereinafter referred to as ESPCS) is integrated with a permanent magnet synchronous motor (hereinafter referred to as servo motor), a fixed-displacement pump, and a hydraulic cylinder. By controlling the servo motor speed, the output flow of the system can be controlled, as can the displacement, force, and speed of the hydraulic cylinder. Compared with the traditional electro-hydraulic servo valve control system, the ESPCS has the advantages of high power-to-weight ratio, energy saving, and environmental friendliness. However, due to the extremely nonlinear flow output of the ESPCS, further improvement of system control performance is greatly hindered. This paper focuses on the nonlinear characteristics of servo motor, fixed-displacement pump, hydraulic cylinder, and other key components in the system. A compensation method based on nonlinear characteristic mapping is proposed. Compared with the traditional PID control method (pressure control accuracy ± 0.12 MPa), the pressure control accuracy of the system is greatly improved (pressure control accuracy ± 0.037 MPa), which opens up a new way to improve the pressure control accuracy of the ESPCS.

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23

Xu, Xiang, Zhi Xiong Li, and Hong Ling Qin. "Design and Integrated Simulation of the Electro-Hydraulic Servo System Based on AMESim and Matlab." Applied Mechanics and Materials 44-47 (December 2010): 1355–59. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.1355.

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Since electro-hydraulic servo system has fast response and highest control accuracy, it has been widely used in industrial application, including aircraft, mining, manufacturing, and agriculture, etc. With the fast development of computer science, it is feasible and available to evaluate the performance of the designed control system via virtual simulation before the practical usage of the system. In order to optimize the design procedure of the electro-hydraulic proportional controller, the co-simulation design method based on AMESim-Matlab is presented for the electro-hydraulic servo system in this paper. High accuracy of the mathematical model of electro-hydraulic servo system was full-fitted by the use of AMESim, and the advantage of high solving precision for large amount of calculation was full played using Matlab. The PID controller was employed to realize the efficient control of the motion of the hydraulic cylinder. The united simulation technique was adopted to verify the good performance of the designed control system. The simulation results suggest that the proposed method is effective for the design of electro-hydraulic servo systems and thus has application importance.

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24

Li, Feng, Kai Wang, Cheng Li Ma, and Jie Yu. "Dynamic Modeling and Tracking Control Simulation for Large Electro-Hydraulic Servo System." Applied Mechanics and Materials 416-417 (September 2013): 811–16. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.811.

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The co-simulation method of one large electro-hydraulic servo system based on software interface is proposed in this paper. The rigid-flexible-coupling dynamic model of the electro-hydraulic servo mechanism was built through data exchange of SolidWorks, ANSYS and ADAMS, the hydraulic system model and control system framework was built by EASY5 environment, the controller was built by Simulink. The integration of simulation models for the large electro-hydraulic servo system was realized by software interfaces. In view of the poor operation conditions, the high requirement of control precision and real-time characteristics, adaptive fuzzy sliding mode control strategy was applied to position tracking control of the servo system. Simulation results verified the effectiveness of this method.

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25

Li, Yu, Yan Jun Liu, and Ji Bin Liu. "Research on Hydraulic Servo Wobble Board Wave Machine." Advanced Materials Research 694-697 (May 2013): 560–64. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.560.

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Wave machine is one of the necessary laboratory equipments to optimize the structures and devices in the field of marine engineering. For the purpose of putting forward a new hydraulic servo wobble board wave machine system, we designed the mechanical structure, and carried out the mathematical model of the servo system. The MATLAB analysis result showed that the wave machine was reliable. This research therefore provided fundamental experience for the manufacture of the wave machines and the marine engineering laboratory equipments, and also worked as a reference for the establishment of the other hydraulic servo systems.

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26

Dong, Longlei. "Electro-hydraulic servo system in the centrifuge field." Chinese Journal of Mechanical Engineering (English Edition) 17, no. 02 (2004): 237. http://dx.doi.org/10.3901/cjme.2004.02.237.

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27

Wang, Zhanlin, Lihua Qiu, and Shi Li. "RESEARCH FOR FORCE SUMMED REDUNDANT HYDRAULIC SERVO SYSTEM." Proceedings of the JFPS International Symposium on Fluid Power 1989, no. 1 (1989): 245–50. http://dx.doi.org/10.5739/isfp.1989.245.

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28

Andersen, Torben O., Michael R. Hansen, Henrik C. Pedersen, and Finn Conrad. "FEEDBACK LINEARISATION APPLIED ON A HYDRAULIC SERVO SYSTEM." Proceedings of the JFPS International Symposium on Fluid Power 2005, no. 6 (2005): 167–72. http://dx.doi.org/10.5739/isfp.2005.167.

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29

Lin, Chun-Ying, Fang-Cheng Shen, Kuo-Tsai Wu, Huei-Huang Lee, and Sheng-Jye Hwang. "Injection Molding Process Control of Servo–Hydraulic System." Applied Sciences 10, no. 1 (December 20, 2019): 71. http://dx.doi.org/10.3390/app10010071.

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The present study constructs a servo–hydraulic system to simulate the filling and packing processes of an injection molding machine. Experiments are performed to evaluate the velocity and position control of the system in the filling stage and the pressure control in the packing stage. The results demonstrate that the proposed system meets the required performance standards when operated with the proportional-integral–derivative (PID) controller under a sampling frequency of 1000 Hz.

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30

Han, Lei, Hong Jie Wang, De You Li, and Yang Yao. "MRAC for Direct Drive Electronic-Hydraulic Servo System." Advanced Materials Research 433-440 (January 2012): 4142–48. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.4142.

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In order to improve the accuracy, stability and rapidity of response, the paper built the mathematic model, and designed the high order system following the low order model based on Popov Hyperstable theory. Then applied this control method and PID method in actual system, compared them in time domain response. The result approves that the system owns better rapid and stable characteristics, satisfying the requirement when the direct drive electronic-hydraulic position control system changes its conditions. Further, improves that the theory is correct, certificates that the MRAC is very adaptive to the direct drive electronic-hydraulic servo system.

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31

Hancu, Olimpiu, Vistrian Maties, and Radu Balan. "Modeling, simulation and control a hydraulic servo system." PAMM 6, no. 1 (December 2006): 811–12. http://dx.doi.org/10.1002/pamm.200610385.

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32

Wang, Xin Ge, Lei Li, Hui Ling Han, Xiu Ling Wei, Mao Dian An, and Bing Feng Liu. "Electro-Hydraulic Servo Actuator Parameters Self-Tuning Three-Dimensional Fuzzy Control Research." Applied Mechanics and Materials 607 (July 2014): 811–14. http://dx.doi.org/10.4028/www.scientific.net/amm.607.811.

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According to the different working state of electro-hydraulic servo actuator servo system, the design parameter self-tuning three-dimensional fuzzy controller, the automatic setting of three-dimensional fuzzy controller quantization factor and scaling factor, enhance the adaptability of fuzzy control system and tracking performance, and improve the quickness of electro-hydraulic servo actuator servo system, reduce the overshoot, the rapidity and precision meet the electro-hydraulic servo actuator control servo system dynamic performance and static performance requirements. 1.Parameter self-tuning three-dimensional fuzzy controller scheme

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33

Qu, Zhi Yong, and Zheng Mao Ye. "Model Reference Adaptive Control on a Hydraulic Servo System." Advanced Materials Research 268-270 (July 2011): 505–8. http://dx.doi.org/10.4028/www.scientific.net/amr.268-270.505.

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Hydraulic servo systems are usually used in industry. This kind of system is nonlinear in nature and generally difficult to control. The ordinary linear constant gain controller can cause overshoot or even loss of system stability. Application of adaptive controller to a nonlinear hydraulic servo system is investigated in this paper. The dynamic model of the system is given and the stability is also analyzed using Popov's criterion. The steady state error can be eliminated using adaptive controller combined with an integration term. Simulation results show the performance of adaptive controller with fast response and less overshoot

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34

Zhu, Cong Ling, Wei Zhu Jin, and Wen Seng Gui. "Design and Stimulation of Hydraulic Servo System for Vehicle Test Equipment for Rubber Shock Absorber." Advanced Materials Research 142 (October 2010): 243–47. http://dx.doi.org/10.4028/www.scientific.net/amr.142.243.

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Development of special rubber shock absorber test equipment for vehicle will become very important, this equipment can test and analysis of dynamic characteristics for rubber shock absorber.The paper discusses the problem on optimum design of electro-hydraulic servo system which drives the vibration set. A closed system for controlling mechanical position or motion using feedback from the electro-hydraulic servo valve of the device as an input has been used in hydraulic servo system. The maximum region of design parameters has been defined for hydraulic servo cylinder as a core element of the electro-hydraulic exciting system. Established the mathematical model of the system, and the dynamic characteristics of the hydraulic servo cylinder are investigated by utilizing the simulation software MATLAB. The results of computer emulation show that this method is practical.

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35

Wang, Xiao Jing, Jun Peng Shao, and Ji Hai Jiang. "Continuous Rotary Motor Electro-Hydraulic Servo System Based on Discrete Sliding Mode Controller." Advanced Materials Research 156-157 (October 2010): 1537–40. http://dx.doi.org/10.4028/www.scientific.net/amr.156-157.1537.

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In order to suppress the periodic interference of continuous rotary electro-hydraulic servo motor, make the motor tracking periodic signals more accurate, and improve the influence of friction interference on the performance of continuous rotary electro-hydraulic servo motor, mathematic model of continuous rotary motor electro-hydraulic position servo system was established, and the compound control method based on the discrete sliding mode controller was adopted to suppress the friction interference. Through the simulation, the result confirms that the discrete sliding mode controller decreases the tracking error of the system, increases the system robust performance and improves performance of continuous rotary electro-hydraulic servo motor. This method is simple and feasible.

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36

Yang, Kun, Cai Jun Liu, and Shu Min Liu. "Study of Hydraulic Servo System Based on Fuzzy Sliding Mode Algorithm." Advanced Materials Research 753-755 (August 2013): 2674–78. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.2674.

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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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37

Cao, Yang, Xiao Yan Tian, Guo Qing Wu, Qiao Mei Li, and Yan Hua Wu. "Simulation Experiment of Roll Bending Machine in Valveless Servo System." Advanced Materials Research 619 (December 2012): 410–14. http://dx.doi.org/10.4028/www.scientific.net/amr.619.410.

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Valveless servo system is a new technology which is widely used in recent years. Compared to the traditional hydraulic system, valveless servo system has a lot of advantages such as high efficiency, less pollution and saving energy, which will be the main research direction of the hydraulic control in the future. Roll bending machine is a large industrial machine, but the efficiency of existing hydraulic system of roll bending machine is low and the cost of maintenance management is high. Applying valveless system on roll bending machine can overcome these defects. This paper made a study of the control strategies which were about valveless servo system on roll bending machine. And software MATLAB was used to do simulation experiment on valveless servo system. This paper summarized the steady-state error and dynamic characteristics according to output signals in different input signals.

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38

Yamada, Hironao, Shigeki Kudomi, Yoshinori Niwa, and Takayoshi Muto. "Development of a Hydraulic Force-Display (Application to One-DOF Master-Slave Control)." Journal of Robotics and Mechatronics 15, no. 1 (February 20, 2003): 39–46. http://dx.doi.org/10.20965/jrm.2003.p0039.

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In this study, we deal with a bilateral master-slave system for tele-robotics composed of electro-hydraulic servo-systems. In a teleoperated master-slave system, the master has to play two roles, firstly as a reference input device to the slave and secondly as a force display device. In order to produce a force display composed of hydraulic servo-systems, we must solve a problem called back-drivability, in which the actuator in a hydraulic servo-system cannot be operated freely by manual means. As a practical solution to this problem, we propose a driving method for the actuator that uses a force sensor attached to the actuator Furthermore, as an application of the proposed force display, we construct a bilateral master-slave system coposed of electro-hydraulic servo-systems. Experimental results of the manipulate on of motion by this system are presented and, consequently, the validity of the hydraulic force-display was confirmed.

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Guansak, Pitipongsa, Den Kogphimai, and Watcharin Po-Ngaen. "Two Layer Fuzzy Generalized Maxwell-Slip Compensator in Direct Drive Servo Hydraulic System." Applied Mechanics and Materials 249-250 (December 2012): 420–27. http://dx.doi.org/10.4028/www.scientific.net/amm.249-250.420.

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In industrial machinery units in which handle with high loads, hydraulic cylinders are often used to actuate the manipulators. The nonlinear effects of friction in the hydraulic cylinders can be a problem if they disturb the motion of the hydraulic servo system.Friction compensation is a prerequisite for accurate in a hydraulic servo system. This paper presents anintelligent nonlinear friction compensation framework,which the purpose is to develop a friction compensator strategy based on adaptive twolayer fuzzy controller. Thecompensator Generalized Maxwell-Slip fuzzy,combined with fuzzy controller, will be implemented to reduce the lackperformance resulting from friction. The electiveness of this approach is demonstrated by experiments on the direct drive servo hydraulic system.

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Jiang, Shou Yong, and Yan Jun Liu. "Intelligent Control on Valve-Controlled Motor Speed Servo System." Advanced Materials Research 945-949 (June 2014): 1543–46. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.1543.

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A intelligent speed control method for the hydraulic valve-controlled motor system was presented based on the fuzzy-neural network control which introduces the fuzzy control into neural network. The simulation results showed the self-adaptive ability and controlling performance of the hydraulic valve-controlled motor system was improved.

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Wang, Yu Qin, Quan Sheng Jiang, and Han Sheng Yang. "Optimization Design of CVT Electro-Hydraulic Servo System Based on H∞ Control." Applied Mechanics and Materials 385-386 (August 2013): 823–26. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.823.

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In order to improve ride comfort and reduce the sense of frustration generated by the car when shifting, H robust control algorithm is proposed to optimize the design of CVT electro-hydraulic servo system. The CVT electro-hydraulic servo system is optimized by the development of system control model and the design of H∞ robust controller. The simulation result indicates that the systems uncertainties can be optimized effectively by the H∞ controller, while the systems anti-interference ability and robustness is improved obviously.

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Su, Wen Hai, and Ji Hai Jiang. "Direct Drive Volume Control Electro-Hydraulic Servo Ship Rudder." Key Engineering Materials 439-440 (June 2010): 1388–92. http://dx.doi.org/10.4028/www.scientific.net/kem.439-440.1388.

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Direct drive volume control（DDVC）electro-hydraulic servo system has synthesized the advantages of high power of hydraulic system and flexible control of the motor. It also has other features such as energy saving, high efficiency, small bulk and high reliability. On the background for application to the ship steering system, DDVC electro-hydraulic servo system for the control actuator of ship is designed and the mathematic model is made and simulated with Matlab/Simulink. The steering gears closed-loop system’s simulation obtained the perfect dynamic performances; verify the correctness of the design with its control strategy. It can satisfy the ships request of boat to steering gears system and the DDVC electro-hydraulic servo system will be a extensive prospective power equipment of the control actuator of ship in future.

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43

Long, Ze Ming, Bao Jun Zhang, and Shi Qing Guo. "Control Strategy for Hydraulic Hybrid Servo Drive System of Heavy Load Robot." Materials Science Forum 800-801 (July 2014): 521–25. http://dx.doi.org/10.4028/www.scientific.net/msf.800-801.521.

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A kind of compound servo drive system is designed using the characteristics of hydraulic motor large torque and servo motor high accuracy positioning. Proportional pressure valve, proportional flow valve and electromagnetic directional valve was used to control hydraulic motor for tracking servo motor drive control and to achieve servo motor control for weight load of large torque and high accuracy positioning. Pressure, speed control strategy of using PID control is proposed based on the above hydraulic tracking drive system, achieve precise control for trajectory of robot articulated arm under heavy load conditions. And according to the requirements of the pressure, flow rate and reversing in the process of compound servo drive, a torque, speed and direction of the switching control strategy is put forward. Mathematical model is established and simulated based on tracking control system. The experiments indicate: under heavy load conditions, response speed, torque and angle control accuracy of hydraulic hybrid drive system meet the requirements with this control method and torque, speed switching control strategy.

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Chen, Hong Ming, Chun Sheng Shen, and Ting En Lee. "Implementation of Precision Force Control for an Electro-Hydraulic Servo Press System." Applied Mechanics and Materials 190-191 (July 2012): 806–9. http://dx.doi.org/10.4028/www.scientific.net/amm.190-191.806.

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Based on the fuzzy method, a PC-based precision force control scheme is proposed for the electro-hydraulic servo press system. The main feature of proposed scheme is to develop a composite control of relief valve and flow servo valve. With the feedback of force sensor, the fuzzy-based control system is realized by LabVIEW for achieving the precision force control of hydraulic cylinder. In the experiments, a practical platform of hydraulic servo press system is used to demonstrate the effectiveness of proposed scheme. The testing results indicate the accurate output responses.

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Woś, Piotr, and Ryszard Dindorf. "Modeling and Identification of the Hydraulic Servo Drive." EPJ Web of Conferences 213 (2019): 02100. http://dx.doi.org/10.1051/epjconf/201921302100.

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This paper discusses possibilities to apply the dynamic identification with a discrete linear model while assessing the state of the electro-hydraulic drive dynamics. This evaluation is crucial while designing modern power or positional control systems. Experimental data is applied in order to determine the model dynamics of the real system and estimate unknown parameters of an object model. The dependencies were interpreted. The paper includes the selected results of current identification tests of the electro-hydraulic drive system as a result of which the discrete parametric object model was derived.

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Jiang, Wenguang, Cheng Zhang, Pengshuo Jia, Guishan Yan, Rui Ma, Gexin Chen, Chao Ai, and Tiangui Zhang. "A Study on the Electro-Hydraulic Coupling Characteristics of an Electro-Hydraulic Servo Pump Control System." Processes 10, no. 8 (August 5, 2022): 1539. http://dx.doi.org/10.3390/pr10081539.

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Electro-hydraulic servo pump control belongs to an electro-hydraulic coupling motion control system, which involves the mutual penetration and integration of mechanical, hydraulic, electrical, control, and other disciplines, as well as the time-varying, uncertain, multisource, and multifield problems of the internal and external excitation of the system, which makes the electro-hydraulic servo pump control system have the characteristics of a complex model, strong coupling, nonlinearity, and time-variation, resulting in the low accuracy and poor dynamic characteristics of the system. This paper takes a servo motor quantitative pump hydraulic cylinder load as the main dynamic line; divides the electro-hydraulic servo pump control system into a motor pump unit, a hydraulic transmission unit and a power output unit; analyzes its electromechanical coupling characteristics, pressure flow coupling characteristics, and mechanical–hydraulic coupling characteristics, respectively; studies the multiparameter characteristics of the system under the electromechanical–hydraulic coupling conditions; and summarizes the influence laws between the parameters. Finally, through a MATLAB/Simulink simulation, it provides a theoretical basis and guidance for high-performance control of the system.

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Yin, Luyue, Wenxiang Deng, Xiaowei Yang, and Jianyong Yao. "Finite-Time Output Feedback Control for Electro-Hydraulic Servo Systems with Parameter Adaptation." Machines 9, no. 10 (September 26, 2021): 214. http://dx.doi.org/10.3390/machines9100214.

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Measurement noise, parametric uncertainties, and external disturbances broadly exist in electro-hydraulic servo systems, which terribly deteriorate the system control performance. To figure out this problem, a novel finite-time output feedback controller with parameter adaptation is proposed for electro-hydraulic servo systems in this paper. First, to avoid using noise-polluted signals and attain active disturbance compensation, a finite-time state observer is adopted to estimate unknown system states and disturbances, which attenuates the impact of measurement noise and external disturbances on tracking performance. Second, by adopting a parameter adaptive law, the parametric uncertainties in the electro-hydraulic servo system can be much lessened, which is beneficial to averting the high-gain feedback in practice. Then, integrating the backstepping framework and the super-twisting sliding mode technique, a synthesized output feedback controller is constructed to achieve high-accuracy tracking performance for electro-hydraulic servo systems. Lyapunov stability analysis demonstrates that the proposed control scheme can acquire finite-time stability. The excellent tracking performance of the designed control law is verified by comparative simulation results.

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Jiang, Wenguang, Pengshuo Jia, Guishan Yan, Gexin Chen, Chao Ai, Tiangui Zhang, Keyi Liu, Chunyu Jia, and Wei Shen. "Dynamic Response Analysis of Control Loops in an Electro-Hydraulic Servo Pump Control System." Processes 10, no. 8 (August 19, 2022): 1647. http://dx.doi.org/10.3390/pr10081647.

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An electro-hydraulic servo pump control system realizes the basic action of a hydraulic cylinder by controlling the servo motor, which effectively improves the problems of a traditional valve control system such as high energy consumption, low power-to-weight ratio, and poor anti-pollution ability. However, the static accuracy and dynamic performance of an electro-hydraulic servo pump control system are limited due to the electro-hydraulic coupling and flow nonlinearity. Based on this, in this paper, we establish a mathematical model of an electro-hydraulic servo pump control system. Starting from the internal control mechanism of the system, the Simulink simulation model is established to analyze the dynamic response of the system current loop, speed loop, position loop, and pressure loop. The system parameters are obtained by combining the system dynamic analysis and component technology samples. The position/force control model of the electro-hydraulic servo pump control system is built for simulation, and the experimental platform is built for experimental verification. The results show that the system position/force control can achieve good dynamic response and steady-state accuracy after the parameters are determined based on the dynamic analysis of control loops.

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Li, Jian Ying, Tian Ye Yang, Yan Wei Wang, Zhi Yong Mao, and Li Gang Wu. "Study of Electro-Hydraulic Force Servo System Based on Flow Press Servo Valve and Neural Network Intelligent Control Strategy." Applied Mechanics and Materials 427-429 (September 2013): 1167–70. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.1167.

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The flow press servo valve has very special work principle, and it now is widely used in the electro-hydraulic force servo system as main and kernel part. According to its special work principle, electromagnetic basic theory and the flow continuity equation, the mechanics analysis of every main part of the flow press servo valve was finished; the author built the mathematic model of the flow press sever valve. During the process of building model, the author took into account the load torque on the torque motor keeper and the total load torque of torque motor. On the other hand, the neural network intelligent control strategy was used in the force servo system to improve the whole system performance. The mathematic model of the electro-hydraulic force servo system controlled by the flow press servo valve with the neural network control strategy was built. The simulation curves and the experiment curves were accord compared by system simulation and experiment results, so we can know also that the mathematic model of the flow press sever valve and the electro-hydraulic force servo system controlled by this kind of valve with the neural network intelligent control strategy are correct.

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50

Linjama, Matti. "Variable speed digital hydraulic transformer–based servo drive." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 234, no. 3 (August 12, 2019): 287–98. http://dx.doi.org/10.1177/0959651819869145.

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This article studies a digital hydraulic servo drive driven by a variable speed electric servomotor. Digital displacement control is implemented by using a two-port digital hydraulic power management system having six pistons and 18 on/off control valves. The first port of the digital hydraulic power management system controls the cylinder speed, while the second port is connected to a hydraulic accumulator. The peak power is taken from the accumulator, and the electric servomotor supplies only the average power into the system. An experimentally validated simulation model is used, and the results show a combination of adequate controllability and excellent energy efficiency. The estimated reduction in the size of the electric motor is 57%.

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