Journal articles: 'Servo Electro-Hydraulic actuator'

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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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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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WOS, Piotr, and Ryszard DINDORF. "BRAIN-COMPUTER INTERFACE FOR CONTROL OF ELECTRO–HYDRAULIC SERVO DRIVE." Journal of Machine Engineering 18, no. 4 (November 30, 2018): 86–95. http://dx.doi.org/10.5604/01.3001.0012.7635.

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The aim of the study was to perform bioelectric signal analysis focusing on its applicability to control of the electro-hydraulic servo drive. The natural bioelectric signals generated by brain, facial muscles and eye muscles read by the NIA (Neural Impulse Actuator) are translated into control commands in the controller of electro-hydraulic servo drive. Bioelectric signals detected by means of special forehead band with three sensors are sent to the actuator box, where they are interpreted as control signals. The test stand was constructed to control of the electro-hydraulic servo drive by means of bioelectric signals generated by the operator. The control signals from the actuator box are transmitted via a wireless network to the controller of electro-hydraulic positioning drive.

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Milecki, Andrzej, Arkadiusz Jakubowski, and Arkadiusz Kubacki. "Design and Control of a Linear Rotary Electro-Hydraulic Servo Drive Unit." Applied Sciences 13, no. 15 (July 26, 2023): 8598. http://dx.doi.org/10.3390/app13158598.

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In this paper, a new solution for an electro-hydraulic servo drive is proposed, which consists of two electro-hydraulic servo drives: one with a hydraulic cylinder and one with a hydraulic rotary motor. In the proposed drive, the linear actuator is attached to a horizontal base and the hydraulic motor is mounted on the actuator piston rod. Thus, the output signal of the drive is the lifting and lowering of the element suspended on the rope. The paper describes the structure, kinematics, dynamics, and control of a novel electro-hydraulic servo drive. A servo valve and a proportional valve are used to control the flow of the hydraulic cylinder and the hydraulic motor. Special attention is paid to the construction of two actuators in one drive unit. The controller is based on the PLC controller. The measuring system uses laser displacement sensors and an encoder. The results of laboratory investigations are discussed in the paper. The proposed drive contains all of the characteristics of a mechatronic device. The main contribution of this study is the proposal of the controller architecture and the algorithm to control the speed and position when lifting or lowering loads.

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Xu, Bing, Hong Li Wang, Fu Li Liu, and Yuan Zheng. "Design of Interface Connecting PC/104 Based Electro-Hydraulic Servo Actuator & CAN Bus." Applied Mechanics and Materials 427-429 (September 2013): 797–801. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.797.

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In order to connect electro-hydraulic servo actuator to CAN network, one interface is designed for connecting electro-hydraulic servo actuator to CAN network. In this article, the author expounds design thinking and realization method for interface hardware and software. The card is applied in practice, and the practice proves the feasibility of the design method.

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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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Ur Rehman, Waheed, Xingjian Wang, Zeeshan Hameed, and Muhammad Yasir Gul. "Motion Synchronization Control for a Large Civil Aircraft’s Hybrid Actuation System Using Fuzzy Logic-Based Control Techniques." Mathematics 11, no. 7 (March 24, 2023): 1576. http://dx.doi.org/10.3390/math11071576.

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The motion synchronization of the hybrid actuation system (composed of a servo-hydraulic actuator and an electro-mechanical actuator) is very important for all applications, especially for civil aircraft. The current research presents a nested-loop control design technique to synchronize motion between two different actuators, such as a servo-hydraulic actuator (SHA) and an electro-mechanical actuator (EMA). The proposed strategy consists of a trajectory, an intelligent position controller (fuzzy logic-based controller), a feed-forward controller, and an intelligent force controller (fuzzy logic-based controller). Position, speed, and acceleration signals are produced by trajectory at a frequency that both SHA and EMA can follow. The SHA/EMA system’s position tracking performance is enhanced by the feed-forward controller and intelligent position controller working together, while the intelligent force tracking controller lowers the issue of force fighting by focusing on the rigid coupling effect. To verify the effectiveness of the proposed strategy, simulations are performed in the Matlab/Simulink environment. The result shows that the proposed intelligent control strategy not only reduces initial force fighting, but also improves load-rejection performance and output-trajectory tracking performance.

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Yu, Li Ming, and Zi Qing Ye. "Research on Performances of Hybrid Actuation System with Dissimilar Redundancies." Advanced Materials Research 430-432 (January 2012): 1559–63. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1559.

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Hybrid actuation system (HAS) with dissimilar redundancies conforms to the development trend of future actuation systems in more electric aircraft (MEA). Hybrid Actuation system is composed of a traditional servo valve controlled hydraulic actuator (SHA) and an electro-hydraulic actuator (EHA). It has two operating models, active/passive mode (A/P) and active/active mode (A/A). In A/A model both actuators are actively controlled. Corresponding to A/A model, SHA is actively controlled and EHA is passively controlled in A/P model. The hybrid actuation system is built in the AMESim simulation environment, comparative analysis is performed when system operates in these two modes, such as signal response and force fighting. The simulation results provide a guideline to determine the specific operating mode of the system in different circumstances.

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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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Yu, Yang, and Bo Qiang Shi. "Design and Simulation of Direct Drive Volume Control Actuator." Applied Mechanics and Materials 155-156 (February 2012): 162–66. http://dx.doi.org/10.4028/www.scientific.net/amm.155-156.162.

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The electro-hydraulic actuator which was designed based on the technology of the direct drive volume control, has the advantages of small volume, high reliability, energy saving and so on, and can effectively overcome the deficiency of traditional valve control electro-hydraulic actuator. This paper realizes co-simulation of direct drive volume control actuator (DDVCA) by using AMESim and Matlab/Simulink. The simulation results show that DDVCA has the characteristics of smooth operation, fast response speed, high control accuracy. Therefore, DDVCA can replace traditional servo valve electro-hydraulic actuator in the case of low frequency response requirement.

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Bai, Yanhong, and Long Quan. "IMPROVING ELECTRO-HYDRAULIC SYSTEM PERFORMANCE BY DOUBLE-VALVE ACTUATION." Transactions of the Canadian Society for Mechanical Engineering 40, no. 3 (September 2016): 289–301. http://dx.doi.org/10.1139/tcsme-2016-0022.

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Restricted by narrow bandwidth of the existing high-flow servo valves, dynamic performance of high-flow electro-hydraulic servo systems can only be enhanced to a certain extent by advanced control algorithms. This paper proposes a new hydraulic control circuit, in which two valves are arranged in parallel to control the actuator jointly. Frequency response of the equivalent valve is raised and thereby the performance of high-flow electro-hydraulic servo systems can be improved. A model of the proposed system is built and the principle of improving system dynamic performance using the new circuit is analyzed. Simulation results show that double-valve actuation schemes can quicken system response and increase system bandwidth regardless to if the two valves have the same or different behaviors.

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Kovari, Attila. "Influence of Internal Leakage in Hydraulic Capsules on Dynamic Behavior of Hydraulic Gap Control System." Materials Science Forum 812 (February 2015): 119–24. http://dx.doi.org/10.4028/www.scientific.net/msf.812.119.

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In hot rolling mills the plastic deformation of the strip is realized at high force and plastic strain speed controlled by electro-hydraulic servo actuators. These hydraulic servo actuators - hydraulic capsules – are capable to adjust the rolling gap at great rolling force dynamically. The dynamic behaviour of the rolling mill’s AGC (automatic gap adjustment) system mainly depends on the correct operation of hydraulic actuators and servo valves. These equipments are great value, planned maintenance is essential for reliable correct operation. The maintenance includes the refurbish of damaged, worn surfaces inside the cylinder and replacement of worn out seals. In the study a laboratory hydraulic positioning system was used to examine the effect of hydraulic actuator internal leakage to dynamic behaviors of the positioning system. Because the laboratory test system is similar to the hydraulic gap adjustment system therefore the laboratory test results can be extended to the rolling mill’s Hydraulic Gap Control system.

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Fadel, M. Z., M. G. Rabie, and A. M. Youssef. "Motion control of an aircraft electro-hydraulic servo actuator." IOP Conference Series: Materials Science and Engineering 610 (October 11, 2019): 012073. http://dx.doi.org/10.1088/1757-899x/610/1/012073.

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Pan, P. F., J. Li, Z. B. Guo, and X. L. Chen. "Mathematical modeling and time-frequency characterization of aero-engine actuators." Journal of Physics: Conference Series 2746, no. 1 (May 1, 2024): 012021. http://dx.doi.org/10.1088/1742-6596/2746/1/012021.

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Abstract The actuator is an essential part of the aero-engine control system, and its performance directly determines the efficiency of the whole system. The mathematical model of the aero-engine actuators, including electro-hydraulic servo valves, hydraulic cylinders, and actuators, is modeled and the time-frequency characteristics are analyzed using the Simulink module. Then, the system response is simulated and its time-frequency characteristics are analyzed. The simulation results show that the simulation error of the established actuator model is within the allowable range. The displacement response and the servo valve flow response fluctuate slightly near the steady state value, and the error value is only 0.857% at the maximum fluctuation value, and the system still works normally when a dynamic load is added to the system.

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Yu, Li Ming, Shou Qiang Wei, Tian Tian Xing, and Hong Liang Liu. "Reliability Analysis of Hybrid Actuation Based on GSPN." Advanced Materials Research 430-432 (January 2012): 1914–17. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1914.

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Generalized stochastic Petri nets is adopted to develop the reliability models of two operating modes of the hybrid actuation system, which is composed of a SHA (Servo valve controlled Hydraulic Actuator), an EHA (Electro-Hydrostatic Actuator) and an EBHA (Electrical Back-up Hydrostatic Actuator).The dependability of hybrid actuation is got through the Markov chain which the Petri nets sate is isomorphic to and the Monte-Carlo simulation. Simulations are conducted to analyze influences of the operating mode and the fault coverage on system reliability of hybrid actuation system.

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MILECKI, Andrzej, and Dominik RYBARCZYK. "Investigations of applications of smart materials and methods in fluid valves and drives." Journal of Machine Engineering 19, no. 4 (December 20, 2019): 122–34. http://dx.doi.org/10.5604/01.3001.0013.6235.

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In the paper the investigations performed at the Division of Mechtronic Devices at Poznan University of Technology in the area of application of both: smart materials in electro-hydraulic and electro-pneumatic valves, and new methods to control of hydraulic servo drives, are presented. In a first part the piezo bender actuator is shortly described and its application in servo valve is proposed. This actuator replaced the torque motor in the available on the market servo valve. The new valve simulation model is proposed. The simulation and investigations results of the servo valve with the piezo bending actuator are included. In the next part of the paper the application of piezo tube actuator in flapper-nozzle pneumatic valve is described. The test stand and investigations results are presented. Later, in the article, the Model Following Control (MFC) and Fractional order Control (FoC) methods are described. Their application in control of electrohydraulic servo drive is proposed. Some investigations results are included in the paper, showing the advantages of those control methods.

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Nguyen, Manh Hung, Hoang Vu Dao, and Kyoung Kwan Ahn. "Active Disturbance Rejection Control for Position Tracking of Electro-Hydraulic Servo Systems under Modeling Uncertainty and External Load." Actuators 10, no. 2 (January 22, 2021): 20. http://dx.doi.org/10.3390/act10020020.

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In this paper, an active disturbance rejection control is designed to improve the position tracking performance of an electro-hydraulic actuation system in the presence of parametric uncertainties, non-parametric uncertainties, and external disturbances as well. The disturbance observers (Dos) are proposed to estimate not only the matched lumped uncertainties but also mismatched disturbance. Without the velocity measurement, the unmeasurable angular velocity is robustly calculated based on the high-order Levant’s exact differentiator. These disturbances and angular velocity are integrated into the control design system based on the backstepping framework which guarantees high-accuracy tracking performance. The system stability analysis is analyzed by using the Lyapunov theory. Simulations based on an electro-hydraulic rotary actuator are conducted to verify the effectiveness of the proposed control method.

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Saeedzadeh, Ahsan, Ali Tivay, Mohammad Zareinejad, S. Mehdi Rezaei, Abdolreza Rahimi, and Keivan Baghestan. "Energy-efficient hydraulic actuator position tracking using hydraulic system operation modes." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 232, no. 1 (December 11, 2016): 49–64. http://dx.doi.org/10.1177/0954408916683434.

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Efficient actuation is an important requirement in electromechanical designs. Although hydraulic actuators are used extensively when high-magnitude forces are present in heavy machinery, they are not very energy-efficient. This paper aims to increase the efficiency of electro-hydraulic servo systems after introducing a controllable supply pressure and six mode of operation for different condition. This process allows for the system to have very low energy consumption whenever its environmental force agrees with its position reference signal. For this purpose, first, the electrohydraulic servo systems is modeled and a robust H∞ controller is designed for each mode of operation. The resulting control system works based on applying each mode strategy at right time to save energy. The effectiveness of this method is tested by conducting experiments on a hydraulic test rig and presenting the experimental results.

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Ibrahim, Ezz, Tarek Elnady, Mohamed Hassan, and Ibrahim Saleh. "Modelling, transient response and hydraulic behaviour of 2DOF stabilization platform." FME Transactions 48, no. 4 (2020): 833–40. http://dx.doi.org/10.5937/fme2004833e.

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The main part of the hydraulic circuit of the hydraulic stabilization platform (HSP) is the electro-hydraulic servo valve (EHSV), which is very expensive due to its manufacturing requirements, so the proper selection for the geometrical configuration of electro hydraulic servo valve (EHSV) and maintaining the system stability are the main goal for establishing HSP. Also improving the performance of (HSP) to achieve the position tracking in two degrees of freedom (2DOF) based on modifying the different parameters of the hydraulic circuit (actuator size - hydraulic servo actuator geometric configuration - different load on the platform) to achieve the best performance. The system offers a proposal for an upper stabilized platform with moving lower base to be used with ships to achieve a stabilization condition for many purposes such as radar. MATLAB Simulink and Simscape-multibody has been used in modeling the system. Changing the different parameters in the program block library input data (orifice area and spool slot width) to achieve best configuration of the system to be stabilized is discussed. The results show that using 0.6 mm² servo valve orifice area and more raises the system pressure and has a bad effect on system stability, also using 4 mm servo valve slot width has more fluctuation in the system pressure in the transient time than using (3, 2 or 1)mm slot width until approaching stable condition but has a better effect on system stability in the running (operation) time.

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Liu, Xue Jun, Cun Xiang Liu, and Er Li Zhang. "Design and Experiment of Shock Absorber Electro-Hydraulic Servo-Testing System." Applied Mechanics and Materials 190-191 (July 2012): 679–82. http://dx.doi.org/10.4028/www.scientific.net/amm.190-191.679.

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Error compensating PID regulation algorithm was applied to design the shock absorber electro-hydraulic servo-testing system, which conforms to national standard QC/T 545-1999,. According to adopt the MTS407 controller, implement indicator diagram testing, speed diagram testing, friction diagram testing, temperature wearing diagram testing, wearing life testing, single and double actuator testing and whole frequency testing are implemented. After the experiment conducted by using shock absorber CA1049, the result shows that the testing system can collect mass data, and is high precision.

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Sahu, Govind N., Suyash Singh, Aditya Singh, and Mohit Law. "Static and Dynamic Characterization and Control of a High-Performance Electro-Hydraulic Actuator." Actuators 9, no. 2 (June 25, 2020): 46. http://dx.doi.org/10.3390/act9020046.

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This paper characterizes the static, dynamic, and controlled behavior of a high-performance electro-hydraulic actuator to assess its suitability for use in evaluating machine tool behavior. The actuator consists of a double-acting piston and cylinder arrangement controlled by a servo valve and a separate rear chamber controlled by a separate valve, designed to work in conjunction to generate static forces of up to 7000 N that can be superposed with dynamic forces of up to ±1500 N. This superposition of periodic forces with a non-zero mean makes the actuator capable of applying realistic loading conditions like those experienced by machines during cutting processes. To characterize the performance of this actuator, linearized static and dynamic models are described. Since experiments with the actuator exhibit nonlinear characteristics, the linearized static model is expanded to include the influence of nonlinearities due to flow, leakages, saturations, and due to friction and hysteresis. Since all major nonlinearities are accounted for in the expanded static model, the dynamical model remains linear. Unknown static and dynamical model parameters are calibrated from experiments, and the updated models are observed to capture experimentally observed behavior very well. Validated models are used to tune the proportional and integral gains for the closed-loop control strategy, and the model-based tuning in turn guides appropriate closed-loop control of the actuator to increase its bandwidth to 200 Hz. The statically and dynamically characterized actuator can aid machine tool structural testing. Moreover, the validated models can instruct the design and development of other higher-performance electro-hydraulic actuators, guide the conversion of the actuator into a damper, and also test other advanced control strategies to further improve actuator performance.

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Essa, Mohamed El-Sayed M., Magdy AS Aboelela, MA Moustafa Hassan, and SM Abdrabbo. "Design of model predictive force control for hydraulic servo system based on cuckoo search and genetic algorithms." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 234, no. 6 (November 11, 2019): 701–14. http://dx.doi.org/10.1177/0959651819884746.

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This article discusses a system identification based on a black-box state-space model for an experimental electro-hydraulic servo system. Furthermore, it presents force-tracking control for the electro-hydraulic servo system based on model predictive control. The parameters of model predictive controls have been tuned by cuckoo search algorithm as well as genetic algorithm. The realization of model predictive controls depends on using a data acquisition card (NI-6014) and Simulink/MATLAB as the core of the electro-hydraulic servo system control system. In this research, the combination of model predictive control tuned by cuckoo search algorithm and genetic algorithm has been introduced in the form of switching model predictive controls. This combination collects the advantages of two model predictive controls in one model predictive control by switching model predictive controls. The simulation and experimental results display that the suggested switching of model predictive controls introduces a good tracking performance in terms of settling time, rise time, and system overshoots as compared to the two separated model predictive controls. In addition, the experimental evaluation has shown that the proposed switching model predictive controls achieved a stable and robust control system even facing to a different reference command signals (step, multistep, and sinusoidal signals). Moreover, its behavior is more robust for system parameters perturbation and small or large perturbation of disturbances in the working environment. It also achieves the necessitated physical limits of the actuator. As a general conclusion and a deep study of electro-hydraulic servo system, one can conclude that the switching strategy between model predictive control tuned by cuckoo search algorithm and by genetic algorithm has the priority of applying it on the field of electro-hydraulic servo system. The proposed new strategy (switching of model predictive control) is promising in experimental applications.

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Chen, Gexin, Gengting Qiu, Guishan Yan, Tiangui Zhang, Huilong Liu, Wenbin Chen, and Chao Ai. "Optimal Design of Accumulator Parameters for an Electro-Hydrostatic Actuator at Low Speed." Processes 9, no. 11 (October 26, 2021): 1903. http://dx.doi.org/10.3390/pr9111903.

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The electro-hydrostatic actuator (EHA) is a type of highly integrated, compact, closed pump control drive system composed of a servo motor, a metering pump, a hydraulic cylinder and other components. Compared with the traditional valve control system, the electro-hydrostatic actuator has the advantages of a high power-to-weight ratio, high integration, environmental friendliness, and superior efficiency and energy saving. However, due to the complex mechanical–hydraulic coupling mechanism of the system and the existence of non-linear multi-source disturbances, the dynamic and static performance of the system is limited, particularly the pressure pulsation phenomenon under low-speed conditions, which seriously affects the high precision control requirements of the system. In order to address the low-speed pressure pulsation problem of the electro-hydrostatic actuator, first, the mathematical models of the servo motor, metering pump and hydraulic cylinder are established, and the simulation model of the EHA system is created based on MATLAB/Simulink. Second, from aspects of the servo motor and the quantitative piston pump, the causes of the pressure pulsation under low-speed working conditions are analyzed, and the parameter selection method of the accumulator is proposed to eliminate the pressure pulsation based on ωn and ζ of the EHA system. Finally, the optimal charging pressure of the accumulator is simulated and experimentally analyzed. The simulation and experimental results show that the charging pressure range of the accumulator calculated with this method can effectively improve the pressure pulsation phenomenon of the EHA system under low-speed working conditions, and it plays a positive role in the engineering popularization and application of the EHA system.

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Li, Wending, Guanglin Shi, Chun Zhao, Hongyu Liu, and Junyong Fu. "RBF Neural Network Sliding Mode Control Method Based on Backstepping for an Electro-hydraulic Actuator." Strojniški vestnik – Journal of Mechanical Engineering 66, no. 12 (December 15, 2020): 697–708. http://dx.doi.org/10.5545/sv-jme.2020.6866.

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Aiming at the interference problem and the difficulty of model parameter determination caused by the nonlinearity of the valve-controlled hydraulic cylinder position servo system, this study proposes a radial basis function (RBF) neural network sliding mode control strategy based on a backstepping strategy for the electro-hydraulic actuator. First, the non-linear system model of the third-order position electro-hydraulic control servo system is established on the basis of the principle analysis. Second, the model function RBF adaptive law and backstepping control law are designed according to Lyapunov’s stability theorem to solve the problem of external load disturbance and modelling uncertainty, combined with sliding mode control strategy and virtual control law. Finally, simulation and experiment on MATLAB Simulink and semi-physical experimental platform are accomplished to show the effectiveness of the proposed method. Moreover, results show that the designed controller has high tracking accuracy to the given signal.

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Huang, Jing, Zhenkun Song, Jiale Wu, Haoyu Guo, Cheng Qiu, and Qifan Tan. "Parameter Adaptive Sliding Mode Force Control for Aerospace Electro-Hydraulic Load Simulator." Aerospace 10, no. 2 (February 9, 2023): 160. http://dx.doi.org/10.3390/aerospace10020160.

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The aerospace electro-hydraulic servo simulator is used to simulate the air load received during flight, and is used for the performance test and acceptance test of aerospace servo actuators on the ground. The force loading accuracy of the load simulator is an important assessment index. Because the loading system and the actuator system to be tested are coupled together, the free displacement of the system to be tested during loading will bring huge disturbance to the loading system, thus how to suppress external interference has always been a hot issue in the control field. This paper addresses this issue under the influence of nonlinear friction and uncertain external disturbance. First, the exact mathematical model of the system is derived, and the characteristics of the system are described by the state equations. Second, in order to obtain the relevant parameters in the controller, the system parameters are identified. Third, the parameter adaptive sliding mode force control based on the reaching law is proposed, and the performance of the control algorithm is analyzed theoretically. Finally, the new control method is applied in the aerospace electro-hydraulic servo simulator, and the results show that the new control algorithm can suppress the external interference by 95% or more, and the control accuracy is more than 97%, which fully demonstrates the effectiveness of the control method.

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Wang, Kai, Gexin Chen, and Tiangui Zhang. "Pump-Controlled AGC Micro-Displacement Position Control of Lithium Battery Pole Strip Mill Based on Friction Model." Processes 11, no. 9 (August 29, 2023): 2587. http://dx.doi.org/10.3390/pr11092587.

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Electrode roll-forming refers to rolling a battery electrode into a preset thickness through the electro-hydraulic servo pump-controlled hydraulic roll gap thickness automatic control system (known to as pump-controlled AGC). Compared with the motor servo system, the friction problem of the electro-hydraulic servo system is more serious and the friction problem of the actuator itself is very prominent. Moreover, low-speed performance is one of its core indicators, the friction phenomenon is the most abundant during the low-speed stage and the impact on the servo system is also the most obvious. Therefore, for high-performance electro-hydraulic servo control, friction compensation is not only unavoidable, but also a very difficult problem. Aiming to influence the friction on the position control of the pump-controlled system of a lithium battery pole strip mill, the rolling mechanism and process procedure under micro-displacement position control based on the friction model were studied and compared from the perspective of considering friction factors, and a friction compensation controller based on the LuGre model was designed. The control precision of a pump-controlled AGC system was improved through combination with an adaptive robust controller. Because of the diversity of unmeasurable states of the system, a dual observer was designed, and the known model of the system was added to the observer. In the final comparative experiment, the steady-state accuracy of the friction adaptive robust compensation controller system based on the LuGre model reached ±0.3 μm, which is superior to the fuzzy IMC compensation and traditional PID control strategies.

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Gao, Bingwei, and Yongtai Ye. "Research on Position / Velocity Synergistic Control of Electro Hydraulic Servo System." Recent Patents on Mechanical Engineering 13, no. 4 (October 13, 2020): 366–77. http://dx.doi.org/10.2174/2212797613999200420082115.

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Background: In some applications, the requirements of electro-hydraulic servo system are not only precise positioning, but also the speediness capability at which the actuator is operated. Objective: In order to enable the system to achieve rapid start and stop during the work process, reduce the vibration and impact caused by the change of the velocity, at the same time improve the positioning accuracy, and further strengthen the stability and the work efficiency of the system, it is necessary to perform the synergistic control between the position and the velocity of the electrohydraulic servo system. Methods: In order to achieve synergistic control between the position and the velocity, a control method of velocity feed-forward and position feedback is adopted. That is, based on the position control, the speed feed-forward is added to the outer loop as compensation. The position control adopts the PID controller, and the velocity control adopts the adaptive fuzzy neural network controller. At the same time, the position and velocity sensors are used for feedback, and the deviation signals between the position and the velocity obtained by superimposing the feedback are used as the final input of the control object, thereby controlling the whole system. Results: The control effect of the designed position / velocity synergistic controller is verified by simulation and experiment. The results show that the designed controller can effectively reduce the vibration and impact caused by the change of the velocity, and greatly improve the response velocity and the position accuracy of the system. Conclusion: The proposed method provides technical support for multi-objective synergistic control of the electro-hydraulic servo system, completes the requirements of multi-task operation, improves the positioning accuracy and response velocity of the electro-hydraulic servo system, and realizes the synergy between the position and the velocity. In this article, various patents have been discussed.

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Fitz-Coy, Norman, Vivek Nagabhushan, and Michael T. Hale. "Benefits and Challenges of Over-Actuated Excitation Systems." Shock and Vibration 17, no. 3 (2010): 285–303. http://dx.doi.org/10.1155/2010/435740.

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This paper provides a comprehensive discussion on the benefits and technical challenges of controlling over-determined and over-actuated excitation systems ranging from 1-DOF to 6-DOF. The primary challenges of over-actuated systems result from the physical constraints imposed when the number of exciters exceeds the number of mechanical degree-of-freedom. This issue is less critical for electro-dynamic exciters which tend to be more compliant than servo-hydraulic exciters. To facilitate the technical challenges discussion, generalized methods for determining the drive output commands and the actuator input transform is presented. To further provide insights into the problem, over-actuated 1-DOF and 6-DOF examples are provided. Results are presented to support the discussions.

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Guo, Li Li, Li Ming Yu, Yang Lu, and Dian Liang Fan. "Multi-Mode Switching Control for HSA/EHA Hybrid Actuation System." Applied Mechanics and Materials 494-495 (February 2014): 1088–93. http://dx.doi.org/10.4028/www.scientific.net/amm.494-495.1088.

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According to the switch transients problem existing in the Hybrid Actuation System (HAS), a multi-mode switching control system was proposed. This control system, based on the system feedback correction theory, can cater to the demands of dynamic characteristics and switch transients. To start with, the mathematical model of HAS was established on the basic of HASs operating principle, and the HAS is composed of Hydraulic Servo Actuator (HSA) and Electro-Hydrostatic Actuator (EHA). Further, the different operating modes controller are hammered out by employed the PID feedback correction control, and the acceleration feedback controller is added to the switched system to decreasing the switch transients. Finally, simulation results demonstrate the system is precise in tracking displacement signal, and it is validity of mitigating the switch transients by used method of feedback correction.

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Wang, Tao, and Jinchun Song. "Clearance Nonlinear Control Method of Electro-Hydraulic Servo System Based on Hopfield Neural Network." Machines 12, no. 5 (May 11, 2024): 329. http://dx.doi.org/10.3390/machines12050329.

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The electro-hydraulic servo system has advantages such as high pressure, large flow, and high power, etc., which can also realize stepless regulation, so it is widely used in many engineering machineries. A linear model is sometimes only a simple approximation of an idealized model, but in an actual system, there may be nonlinear and transient variation characteristics in the systems. Coupling is reflected in the fact that the components or functional structures implemented by each system used for the design of hydraulic systems are not completely or independently related to each other, but affect each other. The nonlinear clearance between the actuator and the load reduces the control accuracy of the system and increases the impact, thus losing stable working conditions. In the paper, based on the nonlinear clearance problem of the electro-hydraulic servo system, a mathematical transfer model with clearance is established, and on this basis, a clearance compensation method based on the Hopfield neural network is proposed. In this way, clearance compensation can be realized by adjusting the parameters of neural network nodes, through simple and convenient operation. Finally, by setting different clearance values, the results of the step response and sine response curve before and after clearance compensation of the hydraulic system are compared, and the effectiveness of Hopfield neural network compensation clearance control is verified based on the comparison simulation results.

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31

Cho, Jung San. "A Study of Hydraulic Actuator Based On Electro Servo Valve For A Walking Robot." Journal of Drive and Control 13, no. 2 (June 1, 2016): 26–33. http://dx.doi.org/10.7839/ksfc.2016.13.2.026.

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Sun, Xiaozhe, Xingjian Wang, and Siru Lin. "Multi-Fault Diagnosis Approach Based on Updated Interacting Multiple Model for Aviation Hydraulic Actuator." Information 11, no. 9 (August 26, 2020): 410. http://dx.doi.org/10.3390/info11090410.

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The aviation hydraulic actuator (HA) is a key component of the flight control system in an aircraft. It is necessary to consider the occurrence of multiple faults under harsh conditions during a flight. This study designs a multi-fault diagnosis method based on the updated interacting multiple model (UIMM). The correspondence between the failure modes and the key physical parameters of HA is found by analyzing the fault mode and mechanism. The key physical parameters of HA can be estimated by employing a series of extended Kalman filters (EKF) related to the different modes of HA. The models in UIMM are updated once the fault is determined. UIMM can reduce the number of fault models and avoid combinatorial explosion in the case of multiple faults. Simulation results indicate that the multi-fault diagnosis method based on UIMM is effective for multi-fault diagnosis of electro-hydraulic servo actuation system.

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Wang, Xiao Lu, Yu Chuan Zhu, Qing Feng Cheng, Yue Song Li, and Hong Xiang Xu. "Simulation Research on the Four-Nozzle Flapper Valve Based on GMA." Advanced Materials Research 287-290 (July 2011): 239–44. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.239.

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Nozzle-flapper type electro-hydraulic servo valve operated by torque motor has been widely used in industrial applications. As their bandwidths are limited, they are not suitable for high-speed applications. This paper presents a novel nozzle flapper valve driven by the giant magnetostrictive actuator, which has been designed and integrated into the four-nozzle flapper valve to replace the torque motor. And the influence of involved structural parameters on the dynamics of the actuator and the nozzle flapper valve is analyzed by AMESim. The simulation results can provide an important reference and basis for the optimization and design of the four-nozzle flapper valve.

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Song, Changlin, and Yong Yang. "Nonlinear-Observer-Based Neural Fault-Tolerant Control for a Rehabilitation Exoskeleton Joint with Electro-Hydraulic Actuator and Error Constraint." Applied Sciences 13, no. 14 (July 18, 2023): 8294. http://dx.doi.org/10.3390/app13148294.

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The rehabilitation exoskeleton is an effective piece of equipment for stroke patients and the aged. However, this complex human–robot system incurs many problems, such as modeling uncertainties, unknown human–robot interaction, external disturbance, and actuator fault. This paper addresses the adaptive fault-tolerant tracking control for a lower limb rehabilitation exoskeleton joint driven by an electro-hydraulic actuator (EHA). First, the model of the exoskeleton joint is built by considering the principle of the hydraulic cylinder and the servo valve. Then, a novel disturbance-observer-based neural fault-tolerant control scheme is proposed, where the neural network and disturbance observer are incorporated to reduce the influence of the the nonlinear uncertainties and disturbance. Meanwhile, a barrier Lyapunov function is constructed to ensure the stability of the closed-loop system. Finally, comparative simulations on an exoskeleton joint validate the effect of the proposed control scheme.

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LI, Ting, Yeming YAO, Linhai ZHANG, Yang LI, and Xinmin WANG. "Adaptive fault-tolerant control for electro-hydraulic servo actuator based on multiple unmodeled dynamics estimation and compensation." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 41, no. 1 (February 2023): 18–27. http://dx.doi.org/10.1051/jnwpu/20234110018.

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The internal leakage fault-tolerant control problem of the electro-hydraulic servo actuator under the influence of multiple unmodeled dynamics is investigated in this paper, and an adaptive fault-tolerant control scheme based on unmodeled dynamics estimation and compensation is proposed. The model of the actuator is divided into two subsystems, which extended-state observers are respectively constructed to estimate the matched and mismatched unmodeled dynamics. Combined with the estimation results of the unmodeled dynamics, an adaptive fault-tolerant controller is designed by using the backstepping method. In which a controller reconfiguration mechanism based on internal leakage fault parameter online adaptation is used to accommodate the fault, and a feedforward compensation strategy is used to suppress the influence of unmodeled dynamics. Semi-physical simulation test of the proposed scheme is conducted under serious cylinder internal leakage. The test result shows that when the maximum internal leakage flow reaches 10.53 L/min, accounting for about 56.77% of the load flow, at the moment the opening of the servovalve is close to the maximum and the proposed scheme can still achieve high-precision position tracking control, where the maximum position tracking errors of fault transient and post-fault steady state are both limited within ±1.5% of the given position.

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36

Zhao, Ting, Jizhen Liu, and Yuguang Niu. "Improved dynamic model of electro- hydraulic servo and actuator system for steam turbine in power systems." Journal of Computational Methods in Sciences and Engineering 15, no. 3 (August 3, 2015): 437–46. http://dx.doi.org/10.3233/jcm-150556.

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Micheal, J., M. F. Rahmat, N. Abdul Wahab, and W. K. Lai. "FEED FORWARD LINEAR QUADRATIC CONTROLLER DESIGN FOR AN INDUSTRIAL ELECTRO HYDRAULIC ACTUATOR SYSTEM WITH SERVO VALVE." International Journal on Smart Sensing and Intelligent Systems 6, no. 1 (2013): 155–70. http://dx.doi.org/10.21307/ijssis-2017-533.

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38

Macaluso, Andrea, and Giovanni Jacazio. "Prognostic and Health Management System for Fly-by-wire Electro-hydraulic Servo Actuators for Detection and Tracking of Actuator Faults." Procedia CIRP 59 (2017): 116–21. http://dx.doi.org/10.1016/j.procir.2016.09.016.

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Kővári, Attila. "Dynamic Model of Rolling Mill’s Electro-Hydraulic Gap Adjustment System." Materials Science Forum 659 (September 2010): 411–16. http://dx.doi.org/10.4028/www.scientific.net/msf.659.411.

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Choosing of adequate shape technological parameters together with good chemical compound is very important to produce steel strip with required cross-section and material quality. The shaping rate, speed and time have an effect on strip mechanical and geometrical quality. The rate of shaping force needed for steel strip plastic deformation is determined by the strength of the steel forming. In rolling mills technology the plastic deformation of the strip is realized at high plastic strain speed so the dynamic change of shaping force might seriously affects the remaining stress of the rolled strip. The dynamic control of roll gap and force is realized with help of electrohydraulic servo actuator – so-called hydraulic capsules – which can adjust the roll gap at great rolling force dynamically. The quality of stand-mounted hydraulic capsule can greatly affect the dynamics of rolling, consequently the material quality of the rolling. The main contribution of the paper is to analyze the rolling dynamic behavior using the hydraulic capsule and rolling mill mathematical model together to show the changing of dynamic behavior of the system when internal sealing in hydraulic capsule is inefficient.

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Hu, Jing, Ming Liu, and Wei Li. "Position and Speed Double Closed Loop Control Performance of Electro-Hydraulic Actuator System Research Based on AMESim." Applied Mechanics and Materials 779 (July 2015): 220–25. http://dx.doi.org/10.4028/www.scientific.net/amm.779.220.

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In the paper, we research on a preparatory electro-hydraulic actuator product, using the simulation software AMESim to research work to analyze the system performance. We research position in closed loop servo actuator system, generally only considered the requirements of the position. While the speed trajectory and precision control did not do high demand. The position of the system by increasing the speed control strategy module, the system meets the requirements of the position. At the same time, we can achieve speeds start-up operation, stable operation and stopped operation of the three phases according to the requirement following a given trajectory; simultaneously can carry out detailed system performance analysis and research. Simulation results show that increasing position speed control strategy module of the system get very good effect. It can realize the speed control system and satisfy the system output displacement and speed steady-state performance and dynamic response.

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41

Wang, Da Peng, and Shi Zhu Tian. "Pseudo-Dynamic Testing Method Based on External Displacement Control." Applied Mechanics and Materials 204-208 (October 2012): 2428–32. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.2428.

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In order to accelerate the velocity and improve the accuracy of the pseudo-dynamic testing，the external displacement control method is put forward based on the hardware control. The internal displacement sensor of the actuator is invalid on control and substituted by the LVDT displacement sensor connected with the specimen. The process of the feedback displacement and command error compensation is quickly implemented by the internal closed-loop control of the actuator. Compared with the iteratively approximate load control, this method not only makes the testing velocity fast, but also enables the error between command and feedback to be “zero”. The fast pseudo-dynamic testing about a cantilever beam is carried out by applying appropriate PID parameters of the actuator. The testing result shows that although this method has rather high requirements in the control system and electro-hydraulic servo load device, and the risk to some extent, the fast response of the actuator can be firmed by applying appropriate PID control parameters. This method provides a fast testing technology for velocity-dependent structures or specimens.

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Ge, Yaowen, Xiaowei Yang, Wenxiang Deng, and Jianyong Yao. "RISE-Based Composite Adaptive Control of Electro-Hydrostatic Actuator with Asymptotic Stability." Machines 9, no. 9 (August 26, 2021): 181. http://dx.doi.org/10.3390/machines9090181.

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The electro-hydrostatic actuator (EHA), the actuator of electric drive and hydraulic transmission, is competitive since it is small in size, light in weight and high in power density. However, the existence of the velocity loop error of servo motors, unmodeled dynamics and highly nonlinear uncertainties restrict the improvement of the tracking accuracy of the EHA system. In order to achieve high-precision motion control of EHAs, a RISE-based composite adaptive control scheme is proposed in this paper. In the proposed composite adaptive control design, a novel parameter adaptive law is synthesized to compensate for the parametric uncertainties and a robust integral of the sign of error (RISE) feedback is utilized to suppress the adverse effects caused by the lumped disturbances, including the velocity loop error of a servo motor and other unmodeled dynamics. The synthesized parameter adaptive law possesses the advantage of fast convergence, which is beneficial to achieve transient tracking performance improvement. In addition, the proposed controller is more suitable for practical applications since it is chattering free. The closed-loop system stability analysis shows that the proposed control scheme guarantees an excellent asymptotic tracking performance. Finally, comparative simulations are conducted to verify the high-performance nature of the proposed controller.

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Ferrari, Alessandro, Pietro Pizzo, and Massimo Rundo. "Modelling and experimental studies on a proportional valve using an innovative dynamic flow-rate measurement in fluid power systems." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 13 (July 28, 2017): 2404–18. http://dx.doi.org/10.1177/0954406217721259.

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A numerical model of a servoactuator and of a four-port proportional direction control valve has been developed. Mechanical and hydraulic elements have been simulated in the LMS Amesim® environment. The complete model has been validated on the basis of the experimental time histories of the actuator velocity and of the flow-rate controlled by the proportional valve. The validation data have been acquired on a fluid power system used to test electro-hydraulic servovalves according to ISO 10770-1 standard. The measurement of the instantaneous flow-rate through the valve has been performed with an innovative high-dynamics flowmeter, recently developed for high-pressure liquid flows. Furthermore, the model predicted static characteristic of the proportional valve has been compared with a corresponding experimentally derived curve and an analysis of the cause-and-effect relationships has been carried out for the valve static performance. Measured data on valve leakages have also been presented in order to complete the steady-state characterization of the tested valve. The developed model of the hydraulic system has been then applied to realize the Bode diagram of the proportional valve, which is expressed in terms of instantaneous flow-rate as a function of the sinusoidal driving command, as well as the Bode diagram of the subsystem made up of the proportional valve and of the linear actuator. The latter Bode graph is plotted in terms of piston velocity as a function of the sinusoidal driving command provided to the valve. The comparison between the two Bode diagrams has confirmed the accuracy of the ISO procedure, which is based on the assumption of negligible delay introduced by the dynamic response of the servo-actuator and by the oil compressibility. A reliable and cost-saving methodology, which uses the innovative flowmeter instead of the low inertia servo-actuator, is proposed as an alternative to the ISO standard for testing the dynamic response of proportional valves.

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An, Yiqiang, Jiazhe Mao, Chengwei Tong, Xiaoyun Zhou, Jian Ruan, and Sheng Li. "Study of the Dynamic Properties of the Miniature Electro-Hydrostatic Actuator." Machines 12, no. 2 (February 7, 2024): 114. http://dx.doi.org/10.3390/machines12020114.

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The electro-hydrostatic actuator (EHA) is a new type of high-performance servo actuator that originated in the field of aerospace, and it is gradually becoming a common basic component for various types of large equipment. A miniature EHA, mainly composed of a micro two-dimensional (2D) piston pump and a brushless DC motor, is designed in this article by simplifying the system structure. This paper analyzes the structure and working principle of this EHA and establishes the mathematical models of the brushless DC motor, micro two-dimensional pump, and hydraulic cylinder. Field-oriented control (FOC) is used to drive the brushless DC motor, and the models of the controller are established in Simulink. Furthermore, the models of the mechanical and hydraulic systems of the miniature EHA are established in AMESim. In addition to this, a prototype of this miniature EHA was fabricated in this paper and an experimental platform was built for experiments. In the joint simulation environment, the rise time of the EHA system at 6000 r/min is 0.158 s and the frequency response amplitude attenuation to −3 dB has a bandwidth of 20 Hz. On the other hand, the constructed miniature EHA prototype was dynamically characterized to obtain a rise time of 0.242 s at 6000 r/min and a bandwidth of 13 Hz. In this paper, the feasibility of the design scheme of the miniature EHA system is verified, and its excellent dynamic properties are verified with simulation and experiment.

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Yang, Zhaoshu, Zhongbo He, Fengbiao Yang, Ce Rong, and Xinhan Cui. "Design and analysis of a voltage driving method for electro-hydraulic servo valve based on giant magnetostrictive actuator." International Journal of Applied Electromagnetics and Mechanics 57, no. 4 (July 9, 2018): 439–56. http://dx.doi.org/10.3233/jae-170116.

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Wu, Lizhe, Dingxuan Zhao, Xiaolong Zhao, and Yalu Qin. "Nonlinear Adaptive Back-Stepping Optimization Control of the Hydraulic Active Suspension Actuator." Processes 11, no. 7 (July 6, 2023): 2020. http://dx.doi.org/10.3390/pr11072020.

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The displacement tracking performance of the electro-hydraulic servo actuator is critical for hydraulic active suspension control. To tackle the problem of slow time-varying parameters in the existing actuator dynamics model, a nonlinear adaptive back-stepping control (ABC) approach is adopted. Simultaneously, the parameters of the nonlinear ABC are difficult to configure, resulting in a poor control effect. An enhanced particle swarm optimization (PSO) approach integrating crazy particles (CP) and time-varying acceleration coefficients (TVAC) is suggested to optimize the controller settings. Furthermore, in order to obtain satisfactory dynamic characteristics of the transition process, the absolute value of the error time integral performance index is used as the minimum performance index function of parameter selection, and the square term of the control input is added to the performance index function to prevent excessive controller energy. Finally, it can be observed from the simulation results of the highest value emax of the displacement tracking error, the average value eμ of error, and the standard deviation eσ of error that the performance of the ABC parameters optimized by PSO+CP+ATVC is superior to the manually given ABC parameters. Therefore, this control method significantly improves the stability and speed of the control system. It provides a new research idea for the parameter optimization of controllers.

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Konieczny, Jarosław, Marek Sibielak, and Waldemar Rączka. "The Control System for a Vibration Exciter." Solid State Phenomena 198 (March 2013): 600–605. http://dx.doi.org/10.4028/www.scientific.net/ssp.198.600.

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The paper presents the control system for an electro-hydraulic vibration exciter. A vibration exciter is used to carry out kinematic and forced excitations. Such excitations are needed during the static and dynamic examinations of suspension assemblies and their elements, such as damping springs. The most important elements of the exciter are: a hydraulic servo valve, a hydraulic actuator, a control system and a hydraulic supply station. An inductor works in a negative feedback loop. A set point generator and controller are parts of a real-time control system. The authors used a cRIO-9022 industrial computer from National Instruments analogue input and output modules. Apart from supporting I/O modules, the cRIO controller in a real-time system communicates with an FPGA circuit that forms a control loop. The use of an FPGA (Field Programmable Gate Array) allowed for implementing a hardware control loop through a vibration exciter, as well as other control loops used in the research (such as controlling an active executive element). The use of such a system architecture enabled the parallel operation of multiple control threads. The selected structure also allows for flexible selection of the measuring channels, which are essential for system monitoring and data acquisition.

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Al-Zughaibi, Ali, Yiqin Xue, Roger Grosvenor, and Aniekan Okon. "Design and investigation of pole assignment controller for driving nonlinear electro hydraulic actuator with new active suspension system model." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 233, no. 13 (January 25, 2019): 3460–79. http://dx.doi.org/10.1177/0954407018822254.

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Fully active electrohydraulic control of a quarter-car test rig is considered from both a modelling and experimental point of view. This paper develops a nonlinear active hydraulic design for the active suspension system, which improves the inherent trade-off between ride quality and suspension travel. The novelty is in the use of pole assessment controller to drive a nonlinear active suspension with a new insight into the model through consideration of a new term, friction forces. Therefore, this model has taken into account the dynamic inclination angle [Formula: see text] between linkage and actuator regardless of the fact that the designer made an only vertical motion (bounce mode) of the wheel and body units. The second contribution of this paper is that it investigated the control force generation, therefore, the nonlinear hydraulic actuator whose effective bandwidth depends on the magnitude of the suspension travel, which incorporates the dynamic equation of servovalve, is deeply researched. The nonlinear friction model is accurately established, which relies on the dynamics system analysis and the fact of slipping the body on lubricant supported bearings; this model will caption all the friction behaviours that have been observed experimentally. In addition, the hydraulic system is used to generate the system inputs as a road simulator. The controller smoothly shifts its focus between the conflicting objectives of ride comfort and rattle space utilisation, softening the suspension when suspension travel is small and stiffening it as it approaches the travel limits. Thus, the nonlinear design allows the closed-loop system to behave differently in different operating regions. The improvement achieved with our design is illustrated through comparative experiments and simulations. C++ compiler environment is used to simulate the physical system to be controlled. The results show good servo control and fast regulation of abrupt disturbances.

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Zhang, Shuzhong, Tianyi Chen, and Fuquan Dai. "Adaptive Backstepping Sliding Mode Control for Direct Driven Hydraulics." Proceedings 64, no. 1 (November 20, 2020): 1. http://dx.doi.org/10.3390/iecat2020-08496.

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Due to the advantages of high energy efficiency and environmental friendliness, the electro-hydraulic actuator (EHA) plays a vital role in fluid power control. One variant of EHA, double pump direct driven hydraulics (DDH), is proposed, which consists of double fixed-displacement pumps, a servo motor, an asymmetric cylinder and auxiliary components. This paper proposes an adaptive backstepping sliding mode control (ABSMC) strategy for DDH to eliminate the adverse effect produced by parametric uncertainty, nonlinear characteristics and the uncertain external disturbance. Based on theoretical analysis, the nonlinear system model is built and transformed. Furthermore, by defining the sliding manifold and selecting a proper Lyapunov function, the nesting problems (of the designed variable and adaptive law) caused by uncertain coefficients are solved. Moreover, the adaptive backstepping control and the sliding mode control are combined to boost system robustness. At the same time, the controller parameter adaptive law is derived from Lyapunov analysis to guarantee the stability of the system. Simulations of the DDH are performed with the proposed control strategy and proportional–integral–differential (PID), respectively. The results show that the proposed control strategy can achieve better position tracking and stronger robustness under parameter changing compared with PID.

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Zhang, Shuzhong, Angen Wu, and Fuquan Dai. "Active Disturbance Rejection Control for Double-Pump Direct-Driven Hydraulics." Proceedings 64, no. 1 (November 20, 2020): 14. http://dx.doi.org/10.3390/iecat2020-08497.

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As a result of the energy crisis and further development of the electro-hydraulic actuator, double-pump direct driven hydraulics (DDH) was brought forward, which mainly comprises a servo motor, double fixed displacement pumps, a differential cylinder, a low-pressurized tank and auxiliary valves. To address the problems caused by uncertain parameters and unknown external disturbances of DDH, this paper proposed a control method adopting active disturbance rejection control (ADRC). Firstly, a mathematical model, including a DDH unit and a micro-crane, was created and modelled in MATLAB/Simulink. Further, the model was verified by measurement. After that, the state-space equation model of the system was derived based on its mathematical model and a third-order ADRC was designed using the constructed system state-space equation. Additionally, tracking-differentiator (TD) was employed to process the input signal transiently to avoid unnecessary oscillations, and the extended state observer (ESO) was used to accurately estimate the influence of the uncertainty and compensate by nonlinear feedback control law (NFCL). Moreover, the proposed ADRC or Proportional–Integral–Differential (PID) control was combined with the mathematical model of a micro-crane. Finally, the simulations were performed under varying loads, and the system position tracking performance were analyzed and compared. The results show that the ADRC can sufficiently suppress the unknown external disturbance, has the advantages of robustness, and improves the position tracking precision.

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Journal articles on the topic 'Servo Electro-Hydraulic actuator'

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