Статті в журналах: "Electrohydraulic valve"

1

Luomaranta, Markku, Matti Vilenius, and Ilkka Ahonoja. "Programmable electrohydraulic mobile valve." Mechatronics 2, no. 3 (June 1992): 321–28. http://dx.doi.org/10.1016/0957-4158(92)90025-j.

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2

RUAN, Jian, R. BURTON, Sheng LI, and Faming ZHU. "ELECTROHYDRAULIC VIBRATION EXCITED BY 2D VALVE." Proceedings of the JFPS International Symposium on Fluid Power 2008, no. 7-2 (2008): 379–84. http://dx.doi.org/10.5739/isfp.2008.379.

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3

Zhu, Fa Ming, and Sheng Li. "Application of Direct Actuated Digital Servo Valve in Electrohydraulic Static Loading System." Applied Mechanics and Materials 130-134 (October 2011): 4098–101. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.4098.

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Structure static testing is an important means to study the static characteristic of complex engineering structure. Electrohydraulic stactic loading system is the singnificant equipment of the testing. With its function of transfering low-power electrical singal to large-power hydraulic output quickly and precisely, the servo valve plays a key role in an electrohydraulic servo control system and dominates to a large extent the performance of the whole control system. Conventional electrohydraulic servo or proportional control is subject to the nonlinearites of their electro-mechanical interface, such as hysteresis, saturation and finite resolution. In this paper, a direct actuated digital servo valve was applied in electrohydraulic static loading system. It can be driven directly by computer needn’t D/A and has the advantages of simple structure, high tolerance to contamination and high reliability. Practical load-experiment results show that the static loading system with a direct actuated digital servo valve can work steadily and reliably and possess high accuracy and fast response.

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4

Li, Yao, and Jian Gang Yi. "Design and Analysis of Fault Diagnosis System of Electrohydraulic Servo Valve Based on ANN." Advanced Materials Research 785-786 (September 2013): 1380–83. http://dx.doi.org/10.4028/www.scientific.net/amr.785-786.1380.

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It is a difficulty to combine artificial neural networks (ANN) with the fault diagnosis of electrohydraulic servo valve. To slolve this problem, the fault diagnosis mechanism of electrohydraulic servo system is analysed, the effecitveness of fault diagnosis based on ANN is verified, and the pressure characteristic data are used to construct ANN samples. Finally, the algorithms of RBF, BP and Elman are compared with the built system and sampled. The results show the RBF algorithm is more rapid and accurate and the proposed intelligent fault diagnosis system of electrohydraulic servo valve is valuable.

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5

TIMOKHIN, SERGEY, PAVEL BOGATYREV та DMITRIY GALIN. "УСОВЕРШЕНСТВОВАННАЯ ТЕХНОЛОГИЯ РЕМОНТА ЭЛЕКТРОГИДРАВЛИЧЕСКИХ ФОРСУНОК АВТОТРАКТОРНЫХ ДИЗЕЛЕЙ". Tekhnicheskiy servis mashin 4, № 141 (грудень 2020): 74–82. http://dx.doi.org/10.22314/2618-8287-2020-58-4-74-82.

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The actual service life of electrohydraulic injectors of automotive diesel engines with a high-pressure battery system of the Common Rail type in operation is significantly lower than the claimed one, and its restoration by repair is relevant from a technical and economic point of view. One of the most wearable elements of electrohydraulic injectors is the contact surface of the ball valve seat. (Research purpose) The research purpose is in developing an improved technology for repairing electro-hydraulic injectors of automotive diesel engines with a vibration-rivet of the contact surface of the ball valve seat. (Materials and methods) The article presents the carried out theoretical substantiation of the process of vibration riveting of the ball valve seat of electrohydraulic injectors and its laboratory and bench studies using serial stands for testing electrohydraulic injectors, checking their elements and restoring the seat geometry by lapping, an electronic digital microscope. (Results and discussion) Authors confirmed the working hypothesis about the possibility of forming the ring contact surface of the ball valve of electrohydraulic injectors reinforced with a vibration riveting by creating certain hydraulic and electrical modes of its operation during the required time. For the model 0445110376 electrohydraulic injectors of the Cummins ISF 2.8 diesel engine, the total area of the hardened surface of the regular ring shape was 0.07 square millimeters, and the depth was about 0.003 millimeters with a process time of 45 minutes. The parameters of the experimental electrohydraulic injectors met the requirements of the test plan, and they are currently successfully undergoing operational tests. (Conclusions) The use of a valve seat vibration rivet will increase the life of repaired injectors at a low cost for its implementation.

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6

Xu, Yuliang, Jiadui Chen, and Zhenghong Liu. "Experimental Study on Hydraulic Pulsation Features of Intelligent Variable Valve System for Auto Energy Saving." Computational Intelligence and Neuroscience 2022 (May 18, 2022): 1–9. http://dx.doi.org/10.1155/2022/5679520.

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The electrohydraulic valve system can realize continuous variable valve timing and lift using the flexibility of liquid. However, the existing electrohydraulic valve systems usually rely on a high-speed solenoid valve to control the on and off states of the hydraulic circuit, which pushes up the system cost. This paper introduces a continuous hydraulic variable valve timing and lift system with adjustable volume (CVVTL). Unlike the other electrohydraulic valve systems, the CVVTL does not need a high-frequency servo valve to control each valve but adjusts the valve timing and lift by controlling the system volume. However, the maximum operating speed of hydraulic variable valve systems is limited by the inherent pressure fluctuation. To relax the limit, the authors further studied the pressure fluctuation features of the CVVTL system under various conditions and summarized the harms of the fluctuation. After identifying the causes of pressure fluctuation of the CVVTL system, the authors came up with systematic countermeasures to system pressure fluctuation.

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7

RUAN, Jian. "Electrohydraulic Vibration Exciter Controlled by 2D Valve." Journal of Mechanical Engineering 45, no. 11 (2009): 125. http://dx.doi.org/10.3901/jme.2009.11.125.

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8

REICHERT, Maxim, and Hubertus MURRENHOFF. "STIFF ELECTROHYDRAULIC DRIVES USING A HYBRID VALVE." Proceedings of the JFPS International Symposium on Fluid Power 2008, no. 7-3 (2008): 585–90. http://dx.doi.org/10.5739/isfp.2008.585.

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9

REICHERT, Maxim, and Hubertus MURRENHOFF. "Stiff Electrohydraulic Drives using a Hybrid Valve." JFPS International Journal of Fluid Power System 2, no. 2 (2009): 33–38. http://dx.doi.org/10.5739/jfpsij.2.33.

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10

TANAKA, Hirohisa, and Kenji MASUDA. "Electrohydraulic two-stage proportional pressure control valve." Transactions of the Japan Society of Mechanical Engineers Series C 55, no. 510 (1989): 503–7. http://dx.doi.org/10.1299/kikaic.55.503.

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11

Krishnaswamy, Kailash, and Perry Y. Li. "On Using Unstable Electrohydraulic Valves for Control." Journal of Dynamic Systems, Measurement, and Control 124, no. 1 (February 9, 2001): 183–90. http://dx.doi.org/10.1115/1.1433801.

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High bandwidth, high flow rate electrohydraulic valves typically have two or more stages. Most multi-stage valves are expensive, require meticulously clean fluid, and introduce higher order dynamics. On the other hand, single-stage spool valves are cheaper and more reliable. However, a majority of them are not suitable for high bandwidth, high flow rate applications due to limitations of the electromechanical/solenoid spool-stroking actuators. In this paper, we investigate the feasibility of reducing this limitation by exploiting the transient flow forces in the valve so as to achieve spool dynamics that are intrinsically open-loop unstable. While conventional valves are designed to be open-loop stable, the unstable valve design has to be stabilized via closed-loop feedback. Simulation case studies are conducted to examine the potential dynamic and energetic advantages that an unstable valve may offer. These studies indicate that unstable valves provide faster response than the stable counterparts when stroking forces are limited. Moreover, unstable valves tend to require less positive power and energy to operate.

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12

Yan, Guishan, Zhenlin Jin, Tiangui Zhang, and Penghui Zhao. "Position Control Study on Pump-Controlled Servomotor for Steam Control Valve." Processes 9, no. 2 (January 25, 2021): 221. http://dx.doi.org/10.3390/pr9020221.

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In steam turbine control and actuation, the steam control valve plays a key role in operability and reliability. The electrohydraulic regulating system for the steam control valve, usually called the servomotor, needs to be reliable and high performing under nonlinear excitation interference in actual conditions. Currently, electrohydraulic servo valve control technology is widely used in servomotors. Although this technology has good control performance, it still has some technical defects, such as poor antipollution ability, low energy efficiency, large volume size, and limited installation space. Aiming at the abovementioned technical shortcomings of electrohydraulic servo valve control technology, a servomotor-pump-hydraulic cylinder volume control scheme is proposed in this paper, forming a pump-controlled servomotor for the steam control valve. By analyzing the working principle of the pump-controlled servomotor position control in the steam control valve, the mathematical model of a pump-controlled servomotor for the steam control valve is established. The sliding mode variable structure control strategy is proposed, and the variable structure control law is solved by constructing a switching function. To verify the performance of the proposed control method, experimental research was conducted. The research results show that the proposed sliding mode variable structure control strategy has a good control effect, which lays the theoretical and technical foundation for the engineering application and promotion of pump-controlled servomotors for steam control valves and helps the technical upgrade and product optimization of steam turbines.

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13

YUN, Sonam, Jae Seop RYU, Byoung Kyu AHN, Go Do KIM, and Jung Hyun JO. "Electrohydraulic Proportional Metering Valve for Common Rail System." Proceedings of the JFPS International Symposium on Fluid Power 2005, no. 6 (2005): 269–74. http://dx.doi.org/10.5739/isfp.2005.269.

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14

Liaw, Chong-Jer, and F. T. Brown. "Nonlinear Dynamics of an Electrohydraulic Flapper Nozzle Valve." Journal of Dynamic Systems, Measurement, and Control 112, no. 2 (June 1, 1990): 298–304. http://dx.doi.org/10.1115/1.2896139.

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A nonlinear model of an electrohydraulic flapper-nozzle valve is developed, using an energy-based approach. Nonlinearities are found in the resistances, compliances, and the inertances; the latter produce state-dependent coupling terms. The model is applied to a valve designed for pulse-width modulation (PWM). Most model parameters are derived from a priori design parameters, but some were found from a series of experiments which also served to confirm the model. The valve and its model responded satisfactorily to PWM signals up to 500 Hz.

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15

Xu, Ming, and Bo Jin. "Sine Simulation of Energy Regulation Based Electrohydraulic Variable-Speed Drive." Applied Mechanics and Materials 278-280 (January 2013): 365–69. http://dx.doi.org/10.4028/www.scientific.net/amm.278-280.365.

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The variable-speed electrohydraulic drive, which can achieve similar energy efficiency as volume drive system, has some good features. But the slow response and poor low-speed performance limit the development of the variable-speed electrohydraulic drive. The energy regulation based variable-speed electrohydraulic drive is a good solution to solve these problems by adding an energy regulation device and a throttling valve into the system. The sine simulations of energy regulation based electrohydraulic variable-speed drive are carried out. The simulation results have showed that the energy regulation system can not only achieve the goal of a good response, but also keep a good energy-saving performance.

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16

Milecki, Andrzej, and Jarosław Ortmann. "Influences of Control Parameters on Reduction of Energy Losses in Electrohydraulic Valve with Stepping Motors." Energies 14, no. 19 (September 26, 2021): 6114. http://dx.doi.org/10.3390/en14196114.

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In many heavy machines, the use of high force drives is required. For such tasks, electrohydraulic servo drives with proportional valves are used most often. In these valves, the proportional electromagnets are applied. If high precise control is additionally required, it is necessary to use expensive servo valves or precise stepping motors. In this paper, the application of a valve with one (or with two) stepping motors in the electrohydraulic servo drive is described. Such motors may work in a micro-step mode, which enables the precise positioning of the valve spool with low energy consumption. The control system structure that was used for positioning, consisting of such an electrohydraulic servo drive with a valve having stepping motors, is described. In the investigations, the following control parameters are considered: the number of stepping motors used, proportional gain coefficients, supply pressure, and desired step distance. The simulation model of the servo drive is proposed, enabling the investigations of energy consumption during the positioning process. In the investigations, the drive step responses are recorded and compared, taking into account the rise time and energy consumption. The overshot-free algorithm is used in the following step and tested in positioning tasks. The collected results of energy consumption of the drive during the positioning process are compared with other solutions.

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17

He, Y. B., P. S. K. Chua, and G. H. Lim. "Performance Analysis of a Two-Stage Electrohydraulic Servovalve in Centrifugal Force Field." Journal of Fluids Engineering 125, no. 1 (January 1, 2003): 166–70. http://dx.doi.org/10.1115/1.1516573.

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Electrohydraulic servosystems are commonly used in various engineering applications due to their high power-to-weight ratio, good performance, and ease of control. Electrohydraulic servovalves are affected by centrifugal forces when they are used in the fields of spaceflight, earthquake simulation, and geotechnique. Based on theories of fluid dynamics and performance of an electrohydraulic servovalve, the fluid flow and structure of a two-stage electrohydraulic servovalve are analyzed when the valve is affected by centrifugal forces in operation. From calculation and experimental data it is found that centrifugal acceleration is directly proportional to null shift and the scale factor is formulated. Relevant methods to reduce the influence of the centrifugal force are provided.

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18

Arafa, H. A., and M. Rizk. "Identification and Modelling of Some Electrohydraulic Servo-Valve Non-Linearities." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 201, no. 2 (March 1987): 137–44. http://dx.doi.org/10.1243/pime_proc_1987_201_097_02.

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An experiment is designed to investigate electrohydraulic servo-valves with mechanical feedback, excluding the effects of lap conditions and flow forces on the spool. Equilibrium of the armature–flapper assembly is modelled using exact expressions of the decentering magnetic torque on the armature and the hydraulic reaction on the flapper. Evidence is furnished that the feedback wire stiffness must not be constant as it is usually assumed. The parameters used to describe this hitherto unidentified non-linearity are accurately determined by computer simulation. This phenomenon is furthermore found to account for anomalies observed in the no-load flow gain characteristics of similar valves. Thus, a new criterion for quality and performance of electrohydraulic servo-valves could be established. Derivation of the stall-pressure gain characteristics of first-stage hydraulic amplifiers including a drain orifice is given in the Appendix.

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19

Lin, S. J., and A. Akers. "Dynamic Analysis of a Flapper-Nozzle Valve." Journal of Dynamic Systems, Measurement, and Control 113, no. 1 (March 1, 1991): 163–67. http://dx.doi.org/10.1115/1.2896343.

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A previous analysis into the dynamic behavior of the flapper-nozzle component of the electrohydraulic servovalve was performed after linearization of the equations relating to control piston flow (Lin and Akers, 1989a). This paper reports results for first-stage gain and for dynamic behavior when linearization has not been performed. Good agreement has been achieved between results calculated from the nonlinear theory presented and experimental results.

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20

HU, Yanping. "Load characteristics of π-bridge electrohydraulic proportional relief valve". Chinese Journal of Mechanical Engineering 43, № 11 (2007): 206. http://dx.doi.org/10.3901/jme.2007.11.206.

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21

AALTONEN, Jussi, and Matti VILENIUS. "ELECTROHYDRAULIC SYSTEM FOR HIGH SPEED GAS EXCHANGE VALVE ACTUATION." Proceedings of the JFPS International Symposium on Fluid Power 2002, no. 5-3 (2002): 775–80. http://dx.doi.org/10.5739/isfp.2002.775.

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22

Ruan, J., and R. T. Burton. "An electrohydraulic vibration exciter using a two-dimensional valve." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 223, no. 2 (December 2008): 135–47. http://dx.doi.org/10.1243/09596518jsce634.

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23

Zsiga, Norbert, Andyn Omanovic, Patrik Soltic, and Wolfgang Schneider. "Functionality and Potential of a New Electrohydraulic Valve Train." MTZ worldwide 80, no. 9 (August 16, 2019): 18–27. http://dx.doi.org/10.1007/s38313-019-0086-0.

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24

Turner, James, Steve Kenchington, Richard Pearson, and Dale Stretch. "Development of the Production AVT Electrohydraulic Valve Train System." ATZautotechnology 5, no. 2 (March 2005): 44–47. http://dx.doi.org/10.1007/bf03246884.

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25

Su, Dong Hai, and Xiao Dong Tang. "Design of Hydraulic System for Electrohydraulic Servo Valve Test Bed." Applied Mechanics and Materials 288 (February 2013): 84–87. http://dx.doi.org/10.4028/www.scientific.net/amm.288.84.

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According to the needs of the electrohydraulic servo valve dynamic and static performance testing, designed an automated test system for the test of the static characteristics and dynamic characteristics test combinations together. Its advantage includes a stable system, a high degree of automation, simple operation, and high efficiency, full-featured.

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26

Rybarczyk, Dominik, and Andrzej Milecki. "The Use of a Model-Based Controller for Dynamics Improvement of the Hydraulic Drive with Proportional Valve and Synchronous Motor." Energies 15, no. 9 (April 24, 2022): 3111. http://dx.doi.org/10.3390/en15093111.

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Electrohydraulic drives consist of several nonlinear elements, and the use and design of their control system is difficult. One of the most important parameters of the industrial drive is its settling time, which characterizes their dynamics. An interesting control method, which can be used for the improvement of electrohydraulic drive properties, is the model-following control (MFC). This technique enables to ensure the good control parameters of nonlinear systems in quite an easy way. In this paper, a modification consisting of changing the oil flow factor in the reference model is proposed. This improves both the dynamics of the electrohydraulic servo drive and the adaptation to the load forces, and thus energy consumption. The article describes the application of the MFC method to control an electrohydraulic servo drive in which a special proportional valve, with an permanent magnet synchronous motor (PMSM), is used. To verify the effectiveness of this method, a theoretical description of the drive is proposed. The applied MFC control system is then modeled and investigated in simulations. Lastly, laboratory investigations are made and chosen results are presented and described in the paper. The results obtained in simulation are compared with results obtained in laboratory tests. The investigations show that the usage of MFC shortens the drive settling time and, in this way, improves its dynamics.

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27

Han, Dong, Guo Fang Gong, and Yi Liu. "AMESim Based Numerical Analysis for Electrohydraulic Exciter Applied on New Tamper." Applied Mechanics and Materials 190-191 (July 2012): 11–18. http://dx.doi.org/10.4028/www.scientific.net/amm.190-191.11.

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Tamper, the core equipment of tamping vehicle, is used to complete the work of maintenance and construction in the railway field. Based on international tamping technology and existing problems, a new type of electrohydraulic exciter applied on the tamper is proposed. It mainly consists of spin valve with high speed and micro-displacement double-functioned hydraulic cylinder. In this paper, AMESim Based Dynamic Modeling is carried out to early explore the relationship between operating frequency, axial conducting width of valve orifice and the displacement, velocity, acceleration, vibration force, load pressure, load flow rate. The results indicate that the new electrohydraulic exciter can meet the design requirement well and realize the flexible adjustment of amplitude and frequency through rotational speed control of step motor. Therefore, it adapts to different working environment including hardened ballast and loose ballast. This simulation can not only enrich relative researches of electrohydraulic exciter, but also provide theoretical foundation and practical direction for optimization of device design.

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28

Ioffe, Anatoliy, and Igor Mazur. "Investigation of Operating Regimes of Shut-off Hydrovalve with Electrohydraulic-powered Drive." Periodica Polytechnica Mechanical Engineering 62, no. 4 (August 30, 2018): 292–97. http://dx.doi.org/10.3311/ppme.12194.

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The paper suggests the design of the locking truck hydraulic valve with electro-hydraulic drive and braking, which eliminates the disadvantages of the known designs hydraulic valves. A mathematical model for the study of operating modes of the proposed design of hydraulic valve. As a result of research modes of pressure hydraulic valve is installed, it has a high-speed operation. The proposed design of the shut-off tractor hydraulic valve allows you to quickly make adjustment of the time of its operation during operation using the throttle is part of the hydraulic valve.

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29

Slidenko, V., and S. Shevchuk. "Electrohydraulic adaptive hydropulse system." POWER ENGINEERING: economics, technique, ecology, no. 3 (April 6, 2020): 41–46. http://dx.doi.org/10.20535/1813-5420.3.2020.228613.

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The results of researches of functioning of electrohydraulic adaptive hydropulse system with definition of optimum range of energy of charging of the hydropneumatic accumulator are resulted. Based on the Taylor series, differential-difference transformations were synthesized and an iterative cycle was calculated and implemented on a computer to calculate the motion of a hydraulic hammer, which is characterized by dependences that reflect dynamic processes in accordance with the hydrohammer operation cycle. The range of regulation of energy of charging depending on the course of the conjugated boi-ka and the valve within 1,7 ... 3,05 kJ is established; and the volume of the pneumatic accumulator chamber is 2.6 ... 3.05 kJ. Maximum values of control ranges, respectively: 1.35 kJ and 0.45 kJ. To determine the control parameters of the adaptation process experimentally, within the industrial tests of the variant of the hydropulse system of impact on the oil well collector, it was found that the stabilization of oscillations from the pulse action, depending on the working environment, is achieved in 10-15 s. The developed electrohydraulic adaptive hydropulse system is recommended for introduction into production.

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30

Milecki, Andrzej, and Dominik Rybarczyk. "Modelling of an Electrohydraulic Proportional Valve with a Synchronous Motor." Strojniški vestnik – Journal of Mechanical Engineering 61, no. 9 (September 15, 2015): 517–22. http://dx.doi.org/10.5545/sv-jme.2015.2553.

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31

Rovira-Más, Francisco, Qin Zhang, and Alan C. Hansen. "Dynamic behavior of an electrohydraulic valve: Typology of characteristic curves." Mechatronics 17, no. 10 (December 2007): 551–61. http://dx.doi.org/10.1016/j.mechatronics.2007.07.003.

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32

Yu, Z. Q., M. J. Hu, X. Pei, and J. Ruan. "Actuation and Control of a Micro Electrohydraulic Digital Servo Valve." Journal of Physics: Conference Series 48 (October 1, 2006): 264–68. http://dx.doi.org/10.1088/1742-6596/48/1/049.

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33

Hathout, Jean-Pierre, Jasim Ahmed, and Aleksandar Kojić. "Reduced Order Modeling and Control of an Electrohydraulic Valve System." IFAC Proceedings Volumes 37, no. 22 (April 2004): 167–72. http://dx.doi.org/10.1016/s1474-6670(17)30339-7.

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34

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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35

Sędziak, Dariusz, and Roman Regulski. "Design and Investigations into the Piezobender Controlled Servovalve." Solid State Phenomena 220-221 (January 2015): 520–25. http://dx.doi.org/10.4028/www.scientific.net/ssp.220-221.520.

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Electrohydraulic servo drives can be found in many industrial applications. A typical design of a servovalve uses the known torque motor. The main concept of designing the modification of the servovalve described in the paper was concern about the application of a piezobender as an actuator, working between nozzles as a flapper, at a control stage. The paper presents and investigates the design of a power amplifier for piezobenders and a digital controller for an electrohydraulic servo valve with a piezobender element. The article shows and discusses the main concept of design and the results of experimental investigation.

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36

SUZUKI, Katsumasa, Akira SUDOU, and Tomoaki SUEMASA. "706 The digital control of the electrohydraulic proportional valve using DSP." Proceedings of Yamanashi District Conference 2005 (2005): 199–200. http://dx.doi.org/10.1299/jsmeyamanashi.2005.199.

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37

Pan, Guojun, Yan Ren, and Jian Ruan. "Resonance Analysis of High-Frequency Electrohydraulic Exciter Controlled by 2D Valve." Shock and Vibration 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/590203.

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The resonant characteristic of hydraulic system has not been described yet because it is necessarily restricted by linear assumptions in classical fluid theory. A way of the resonance analysis is presented for an electrohydraulic exciter controlled by 2D valve. The block diagram of this excitation system is established by extracting nonlinear parts from the traditional linearization analysis; as a result the resonant frequency is obtained. According to input energy from oil source which is equal to the reverse energy to oil source, load pressure and load flow are solved analytically as the working frequency reaches the natural frequency. The analytical expression of resonant peak is also derived without damping. Finally, the experimental system is built to verify the theoretical analysis. The initial research on resonant characteristic will lay theoretical foundation and make useful complement for resonance phenomena of classical fluid theory in hydraulic system.

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38

Das, J., Santosh Kr Mishra, RamaShankar Paswan, Ajit Kumar, Sujit Kumar, R. Saha, and S. Mookherjee. "Characterization and tracking control of a nonlinear electrohydraulic valve-cylinder system." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 230, no. 5 (August 3, 2016): 371–84. http://dx.doi.org/10.1177/0954408914554021.

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39

Watton, J., and R. J. Nelson. "Evaluation of an electrohydraulic forge valve behavior using a CAD package." Applied Mathematical Modelling 17, no. 7 (July 1993): 355–68. http://dx.doi.org/10.1016/0307-904x(93)90060-t.

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40

Yuan, Qinghui, and Perry Y. Li. "Using Steady Flow Force for Unstable Valve Design: Modeling and Experiments." Journal of Dynamic Systems, Measurement, and Control 127, no. 3 (September 15, 2004): 451–62. http://dx.doi.org/10.1115/1.1997166.

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In single stage electrohydraulic valves, solenoid actuators are usually used to stroke the main spools directly. They are cheaper and more reliable than multistage valves. Their use, however, is restricted to low bandwidth and low flow rate applications due to the limitation of the solenoid actuators. Our research focuses on alleviating the need for large and expensive solenoids in single stage valves by advantageously using fluid flow forces. For example, in a previous paper, we proposed to improve spool agility by inducing unstable transient flow forces by the use of negative damping lengths. In the present paper, how steady flow forces can be manipulated to improve spool agility is examined through fundamental momentum analysis, CFD analysis, and experimental studies. Particularly, it is found that two often ignored components—viscosity effect and non-metering momentum flux, have strong influence on steady flow forces. For positive damping lengths, viscosity increases the steady flow force, whereas for negative damping lengths, viscosity has the tendency to reduce steady flow forces. Also, by slightly modifying the non-metering port geometry, the non-metering flux can also be manipulated to reduce steady flow force. Therefore, both transient and steady flow forces can be used to improve the agility of single stage electrohydraulic valves. Experimental results confirm the contributions of both transient and steady flow force in improving spool agility.

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41

Rybarczyk, Dominik. "Concept and modelling of the electrohydraulic valve with DC and stepper motors." MATEC Web of Conferences 252 (2019): 06003. http://dx.doi.org/10.1051/matecconf/201925206003.

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The article describes concept and modelling of a new type of electrohydraulic valve controlled by the combination of a stepper motor and a DC motor. The aim of this invention is to use in the proportional valve two motors with the different properties. Both motors are responsible for the movement of a valve spool. The stepper motor and the DC motor are connected to a shaft by using a bellows coupling. Transfer from rotary to linear motion is performed by use of a bolt-nut system. According to the invention, presented here valve can be used in hydraulic drive systems with high positioning accuracy requirement. The author was granted a patent no. P.421994 on the invention described in this paper.

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42

Ding, Hai Gang, Ji Yun Zhao, and Liang Zhao. "Research on Adjustment System for Electrohydraulic Proportional Variable Displacement Pump A4VSO." Applied Mechanics and Materials 34-35 (October 2010): 1028–33. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.1028.

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To achieve the highly reliable and highly accurate adjustment for electrohydraulic proportional pump A4VSO, an adjustment system is established, in which a servoproportional valve replaces a servo valve or a proportional valve. Then its mathematic model is obtained and simulated on Matlab/Simulink, and performance tests about pump displacement and output flow of the pump are carried out under different pressures. Both simulation and experimental results indicate that the adjustment system controlled by servoproportional valve is characterized by higher steady accuracy and more reliability, both the pump displacement and output flow of the pump A4VSO maintain proportional to the control signal, respectively.

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43

Qiu, H., and Q. Zhang. "Feedforward-plus-proportional-integral-derivative controller for an off-road vehicle electrohydraulic steering system." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 217, no. 5 (May 1, 2003): 375–82. http://dx.doi.org/10.1243/095440703321645089.

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This paper presents the use of a feedforward-plus-proportional-integral-derivative (FPID) controller for improving the control performance of the electrohydraulic steering system on an offroad vehicle. The FPID controller used an inverse valve transform in the feedforward loop to compensate for an electrohydraulic steering system deadband and used a conventional PID feedback loop to minimize the tracking error in steering control. On-simulator evaluation tests verified that the FPID resulted in a superior steering rate tracking performance over both a feedforward controller and a PID controller. On-vehicle evaluation tests verified that this FPID controller could achieve prompt and accurate steering angle tracking for agricultural vehicle automated guidance applications.

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44

Elmer, K. F., and C. R. Gentle. "A parsimonious model for the proportional control valve." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 215, no. 11 (November 1, 2001): 1357–63. http://dx.doi.org/10.1243/0954406011524739.

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A generic non-linear dynamic model of a direct-acting electrohydraulic proportional solenoid valve is presented. The valve consists of two subsystems—a spool assembly and one or two unidirectional proportional solenoids. These two subsystems are modelled separately. The solenoid is modelled as a non-linear resistor-inductor combination, with inductance parameters that change with current. An innovative modelling method has been used to represent these components. The spool assembly is modelled as a mass-spring-damper system. The inertia and the damping effects of the solenoid armature are incorporated in the spool model. The model accurately and reliably predicts both the dynamic and steady state responses of the valve to voltage inputs. Simulated results are presented, which agree well with experimental results.

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45

Akanova, Guldana, Irina Galchak, Anatoliy Kol'ga, Ivan Stolpovskich, and Viktor Aleksandrov. "SWITCHING OF HYDRAULIC LINES BY THE METHOD OF ELECTROHYDRAULIC ANALOGY." Transport engineering 2022, no. 3 (March 18, 2022): 31–41. http://dx.doi.org/10.30987/2782-5957-2022-3-31-41.

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The work objective is to prove the possibility of expanding the scope of using hydraulic drive in machines and mechanisms of small and medium power. The problem to which the paper is devoted. Reduction of weight and size parameters of hydraulic machines. Research methods. The problems were solved on the basis of the electrohydraulic analogy method. The novelty of the work. It consists in finding the possibility of replacing complex, large-sized and massive distributors with the simplest hydraulic elements - valves (distributors 2/2) Study results. The conducted studies confirm the possibility to simplify hydraulic circuits significantly, to reduce weight and size parameters and increase the reliability of hydraulic machines. Conclusions. Taking into account the general principles of electric and hydraulic drives operation and using the method of electrohydraulic analogy, it is advisable to make hydraulic drive control systems by analogy with electric drives, based on the simplest elements of the valve type (hydraulic distributor 2/2).

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46

Tu, Fu Quan, Yang Mao, and Ren Bo Xu. "A New Type Electrohydraulic Servo Valve Based on Magnetic Shape Memory Alloy." Advanced Materials Research 873 (December 2013): 91–94. http://dx.doi.org/10.4028/www.scientific.net/amr.873.91.

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In this paper, the magnetically controlled characteristic and shape variation mechanism magnetic shape memory alloys (MSMA) sample are studied through the servo valve actuator based on the MSMA. The MSMA is a new type of functional materials, which has huge driving force and large controllability displacement. The kind of actuator is designed by differential mode of MSMA, employing bias coils to generate biasing magnetic field and applying field coils to provide magnetic field which is controllable. The relationship between displacement of the new actuator and time is got by numerical simulation using Maxwell software. Finally, motivated by the simulation results, the rationality of structural design of the new type of actuator is validated.

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47

KATOH, Yoshiaki, and Hirohisa TANAKA. "Electrohydraulic pressure control of an automatic transmission using a PWM switching valve." Hydraulics & Pneumatics 21, no. 2 (1990): 169–74. http://dx.doi.org/10.5739/jfps1970.21.169.

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48

Qu, Daohai, Yunshan Zhou, Yunfeng Liu, Wei Luo, and Feitie Zhang. "Steady Flow Force Compensation and Test Research on Electrohydraulic Proportional Relief Valve." IEEE Access 7 (2019): 48087–97. http://dx.doi.org/10.1109/access.2019.2908411.

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49

Li, Perry Y., and Kailash Krishnaswamy. "Passive Bilateral Teleoperation of a Hydraulic Actuator using an Electrohydraulic Passive Valve." International Journal of Fluid Power 5, no. 2 (January 2004): 43–55. http://dx.doi.org/10.1080/14399776.2004.10781191.

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50

Somashekhar, S. H., M. Singaperumal, and R. Krishna Kumar. "Modelling the steady-state analysis of a jet pipe electrohydraulic servo valve." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 220, no. 2 (March 2006): 109–29. http://dx.doi.org/10.1243/095965106x78211.

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