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Journal articles on the topic 'Hydraulic control Testing'

Author: Grafiati

Published: 10 December 2022

Last updated: 29 January 2023

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1

Wang, Hua Bing, and Jun Ke Hu. "Durability Testing System with Power Recycle for the Variable Displacement Closed-Loop Hydraulic Pumps." Applied Mechanics and Materials 241-244 (December 2012): 1333–37. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.1333.

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A testing system scheme with power recycle for hydraulic pumps’ durability is present, which is based on a hydraulic motor with hydraulicly overridden pressure compensation. The hydraulic motor can adaptively adjust its displacement to meet the demand of displacement match of the power feedback in the system. The system pressure can be set by adjusting the starting control pressure of the motor. The rotating speed of the pump is guaranteed by the control of the driven electrical motor. A hydraulic bridge unit is used to guide the flow from the outport of the pump to the fixed inlet port of the hydraulic motor and thus causes the motor to rotate in a certain direction to drive the pump in order to recycle the power.

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2

Petřík, Jan, and Aleš Lufinka. "Hydraulic Exciter Control for Shock and Vibration Testing." Applied Mechanics and Materials 827 (February 2016): 105–8. http://dx.doi.org/10.4028/www.scientific.net/amm.827.105.

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The important part of the validation and certification of the new product are vibration and shock testing of mechanical, electrical and electronic equipment components that are mounted on rail vehicles. The hydraulic shaker is possible to use as the vibration and shock exciter to simulate the effect of the environment to the specimen. It is necessary to fulfil the prescribe condition of the level of mechanical vibration and the acceleration peak of the shock test signals. The specific hydraulic motor produced by INOVA is designed for the specific vibration test and the aim is to use it also for the shock tests. The control algorithm uses two iteration methods in time and frequency domain and their use depends on test prescription.

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3

Lv, Jun. "Honeycomb Multistage Control of Hydraulic Loading Testing Machine." Applied Mechanics and Materials 271-272 (December 2012): 606–10. http://dx.doi.org/10.4028/www.scientific.net/amm.271-272.606.

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Static and dynamic characteristics of the honeycomb paperboard with different size and structure are mechanics research priorities. Study on its mechanical characteristics of the basic way is the basic mechanical properties testing by loading testing machine. In order to get the stability of compressive strength of honeycomb paperboard, compressive strength of honeycomb paperboard models should be tested. Based on the existing equipment, new equipment has been made with new hydraulic systems and control programmes, control accuracy and method has been analyzed. Experimental testing results have shown that the device is credible, and its precision meets to the design requirements. The honeycomb paperboard testing machine not only provides a high pressure range and flexible control equipment, but provides a function of testing sample size effects.

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4

Rybak, A. T., I. K. Tsybriy, S. V. Nosachev, and A. R. Zenin. "Theoretical background of hydraulic drive control system analysis for testing piston hydraulic cylinders." Vestnik of Don State Technical University 19, no. 3 (October 4, 2019): 242–49. http://dx.doi.org/10.23947/1992-5980-2019-19-3-242-249.

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Introduction. The durability and performance of hydraulic machines is determined through life tests. At that, various braking devices (mechanical, electric, hydraulic, etc.) are used for strength loading of the hydraulic motor, as a result of which a significant amount of energy is lost. This can be avoided if the method of rotational motion with energy recovery is used during life tests. This approach is applicable for hydraulic pumps, motors, and hydraulic cylinders.Materials and Methods. A test bench is presented, the design of which provides recreation of the conditions most appropriate for the field operation of hydraulic cylinders. In this case, energy recovery is possible. To solve the research problems, methods of mathematical modeling were used, the basic functional parameters of the proposed design were calculated. The determination of the pressure increment at various points in the hydraulic system is based on the theory of volumetric rigidity. When modeling the motion of the moving elements of the bench hydraulic system, the laws of rotor motion are used.Research Results. In the structure of the test bench, the cylinders in question are located in the pressure main between the hydraulic pump and the hydraulic motor. This enables to significantly reduce the bench itself and to save a significant amount of energy due to its recovery. A basic hydraulic diagram of the test bench for piston hydraulic cylinders is presented, in which the operation of the moving elements of the system is shown. A mathematical modeling of the hydraulic system of the bench is performed. A kinematic diagram of the mechanism for transmitting motion between test cylinders is shown.Discussion and Conclusions. The system of equations presented in the paper shows how the increment of pressure at the selected nodal points of the energy recovery system is determined (in particular, how the increment depends on time, reduced coefficient of volumetric rigidity, operating fluid consumption, and piston areas). The velocities of the hydraulic pistons are determined according to the kinematic scheme of the mechanical transmission of the bench. Thus it can be argued that, thanks to the solution presented in the paper, the life test results of hydraulic cylinders will adequately reflect their operation under rated duties.

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5

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

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

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6

Gu, Feng, Ji Hai Jiang, Fei Meng Diao, Quan Du, Lei Gao, Yan Nan Song, and Yan Li. "The Modeling and Simulation of Hydraulic Actuated Control System of Helicopter in Volumetric Speed Control." Applied Mechanics and Materials 779 (July 2015): 169–74. http://dx.doi.org/10.4028/www.scientific.net/amm.779.169.

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Hydraulic generation system on helicopter generally consists of flight control hydraulic actuating circuit, landing gear retraction/extension hydraulic circuit, and wheel brake circuit. This paper studies on a volumetric speed control system applied in helicopter flight control actuating system. The system performance curve, deduced from the modeling, simulation and testing of the tail-actuating system, reveals that this volumetric speed control system meets the requirements of helicopter control system actuating.

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7

Tayade, Akash L. "Design and Development of Hydraulic Control Valve Testing Machine." International Journal for Research in Applied Science and Engineering Technology 8, no. 10 (October 31, 2020): 217–25. http://dx.doi.org/10.22214/ijraset.2020.31851.

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8

Y.T, WANG, and CHANG C.C. "Comparative Implementations of a Hydraulic-Control Fatigue Testing Machine." JSME International Journal Series C 41, no. 1 (1998): 108–15. http://dx.doi.org/10.1299/jsmec.41.108.

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9

Máchal, Pavel, Zdenko Tkáč, Ján Kosiba, Juraj Jablonický, Ľubomír Hujo, Marián Kučera, and Juraj Tulik. "Design of a laboratory hydraulic device for testing of hydraulic pumps." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 61, no. 5 (2013): 1313–19. http://dx.doi.org/10.11118/actaun201361051313.

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The present contribution deals with solves problem of research of testing device to monitor of hydrostatic pumps durability about dynamic loading under laboratory conditions. When carrying out the design of testing device are based on load characteristics of tractor hydraulic circuit, the individual characteristics of hydraulic components and performed calculations. Load characteristics on the tractors CASE IH Magnum 310, JOHN DEERE 8100, ZETOR FORTERRA 114 41 and Fendt 926 Vario were measured. Design of a hydraulic laboratory device is based on the need for testing new types of hydraulic pumps or various types of hydraulic fluids. When creating of hydraulic device we focused on testing hydraulic pumps used in agricultural and forestry tractors. Proportional pressure control valve is an active member of the hydraulic device, which provides change of a continuous control signal into relative pressure of operating fluid. The advantage of a designed hydraulic system is possibility of simulation of dynamic operating loading, which is obtained by measurement under real conditions, and thereby creates laboratory conditions as close to real conditions as possible. The laboratory device is constructed at the Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra.

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10

Chipka, Jordan, Michael A. Meller, Alexander Volkov, Matthew Bryant, and Ephrahim Garcia. "Linear dynamometer testing of hydraulic artificial muscles with variable recruitment." Journal of Intelligent Material Systems and Structures 28, no. 15 (January 12, 2017): 2051–63. http://dx.doi.org/10.1177/1045389x16682845.

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A novel, meso-scale hydraulic actuator characterization test platform, termed a linear hydraulic actuator characterization device, is demonstrated and characterized in this study. The linear hydraulic actuator characterization device is applied to testing McKibben artificial muscles and is used to show the energy savings due to the implementation of a variable recruitment muscle control scheme. The linear hydraulic actuator characterization device is a hydraulic linear dynamometer that can be controlled to enable a desired force and stroke profile to be prescribed to the artificial muscles. The linear hydraulic actuator characterization device consists of a drive actuator that is connected in series with the test muscles. Thus, the drive cylinder can act as a controlled disturbance to the artificial muscles to simulate various loading conditions. With the ability to control the loading conditions of the artificial muscles, the linear hydraulic actuator characterization device offers the ability to experimentally validate the muscles’ performance and energetic characteristics. For instance, the McKibben muscles’ quasi-static force–stroke capabilities, as well as the power savings of a variable recruitment control scheme, are measured and presented in this work. Moreover, the development and fabrication of this highly versatile characterization test platform for hydraulic actuators is described in this article, and the characterization test results and efficiency study results are presented.

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11

Kavurmaci, Berat, Kutay Celebioglu, Selin Aradag, and Yigit Tascioglu. "Model Testing of Francis-Type Hydraulic Turbines." Measurement and Control 50, no. 3 (April 2017): 70–73. http://dx.doi.org/10.1177/0020294017702284.

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12

P, Siva Nagasree, Yugesh Vardhan A, Samuel Divabhishekam V, Mohammed Ali, and Homeswara Siddhu V. "Design and Testing of Hydraulic Actuator in Typical Areospace Vehicle." International Journal for Research in Applied Science and Engineering Technology 10, no. 6 (June 30, 2022): 4071–77. http://dx.doi.org/10.22214/ijraset.2022.44820.

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Abstract: A hydraulic actuator is a mechanical actuator that is used to impart a unidirectional force through a unidirectional stroke. The detailed study of various control actuations and design of typical hydraulic actuation system is need as it plays a major role in the working of aerospace vehicle. This study involves the design of hydraulic actuation system for the flex nozzle of a solid motor as part of thrust vector control actuation system. This actuation system is going to control the vehicle in pitch and yaw direction during powered phase. The design, fabrication and testing of the hydraulic actuator are considered in this work. After designing the hydraulic actuator according to the specifications, testing is done manually, to check the performance of the vehicle by using different techniques. The actuator which is designed, fabricated and tested successfully is ready to be fitted in the aerospace vehicle.

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13

Kałaczyński, Tomasz, Valeriy Martynyuk, Juliy Boiko, Sergiy Matyukh, and Svitlana Petrashchuk. "Exploitation aspects of diagnostic hydraulic and pneumatic systems of Multimedia Hybrid Mobile Stages." MATEC Web of Conferences 332 (2021): 01022. http://dx.doi.org/10.1051/matecconf/202133201022.

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Knowledge of the technical state and construction of the hydraulic and pneumatic control system of Multimedia Hybrid Mobile Stage HMSM allows you to identify hazards and make a risk assessment. The aspects of the algorithmic process of diagnosing pneumatic and hydraulic control systems presented in the work form the basis for the development and implementation of safe solutions in the process of operation. This article describes the methodology for diagnosing HMSM machine hydraulics and industrial pneumatics systems, detailing the factors determining the correctness of maintaining functional fitness. The considerations developed illustrate the complexity of the diagnostic testing design process for condition assessment.

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14

Michalek, Alexander, Admin Husic, Joshua Roundy, and Amy T. Hansen. "Assessment of Climatic and Anthropogenic Controls on Bridge Deck Drainage and Sediment Removal." Water 13, no. 24 (December 12, 2021): 3556. http://dx.doi.org/10.3390/w13243556.

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Bridge deck drainage is essential to prevent hydroplaning and maintain safety along major roadways. With projected changes in climate, current designs may not be sufficient and a better understanding of the primary controls (climate, bridge deck, and inlet design) on the hydraulic efficiency and sediment removal of drainage systems is needed to maintain public safety. To evaluate the controls on hydraulic drainage efficiency, 576 controlled laboratory experiments were conducted testing grate type (rectangular bar vs. curved vane) and downspout configuration (square vs. circular and 20 cm vs. 25 cm) across a range of flow rates, cross slopes, and longitudinal slopes. An additional 144 sediment erosion experiments were performed to identify controls on the removal of sediment. Hydraulic testing indicated that inflow driven by climate is a primary control on drainage efficiency and spread of water on a roadway. For anthropogenic controls, downspout opening size was found to be the primary control followed by longitudinal slope. Sediment removal results indicated that inflow regime and grate type were the primary controls on the sediment removal rate. Given that inflow, driven by climate, is a control on both hydraulic and sediment removal performance, hydraulic engineers should consider forecasted changes in rainfall intensity in their present-day drainage designs. We provide design guidance and discussion for developing a proactive approach to hydraulic infrastructure in the face of future climate uncertainty.

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15

Wang, Cheng Long, Qing Liang Zeng, Guang Yu Zhou, and Sheng Gang Zhao. "Design and Realization of Automatic Testing System for Hydraulic Pump." Advanced Materials Research 189-193 (February 2011): 2727–30. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.2727.

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Based on the application analysis of hydraulic pump CAT test-bench, an automatic testing system of hydraulic pump CAT test-bench combined with technology of measurement and control was raised, including the detailed introduction of its work principle, components and software. By this testing system, tests of hydraulic pumps were realized automatically, accurately and efficiently.

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16

Li, Yao, and Jian Gang Yi. "Research on Hydraulic Components Test System Based on Proportional Control Technology." Advanced Materials Research 912-914 (April 2014): 744–47. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.744.

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Proportional control technology is widely used in many hydraulic systems. In order to measure the characteristics of hydraulic components, it is necessary to establish hydraulic components test system based on proportional control technology. In this paper, the test contents of hydraulic components are analyzed, the performance testing system is designed, the system construction is presented, and the computer test software is developed. The application results showed that the developed system has good value, which can not only be used directly in enterprise to solve the production problem, but also improve the utilization and reliability of hydraulic components.

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17

Tselischev, D. V., V. A. Tselischev, and S. Yu Konstantinov. "Automated Rig for Diagnostics and Testing of Hydraulic Equipment." Automation and Remote Control 80, no. 2 (February 2019): 385–91. http://dx.doi.org/10.1134/s0005117919020152.

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18

Gong, Hai Xia, Jian Li, Yun Peng Wang, and Hui Gang Qu. "Study on Hydraulic System of Test Stand for Subsea Control Module." Applied Mechanics and Materials 548-549 (April 2014): 1023–29. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.1023.

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This paper firstly explained the working principle of Subsea Control Module (SCM) and function and performance of the electro-hydraulic control valves, and then mathematical model of the electro-hydraulic control valve in SCM was analyzed. The test board was designed according to characters of hydraulic system of the test stand. And on the basis of these, an effective testing method of the electro-hydraulic control valve in SCM has been defined. According to the test method of hydraulic system, we built and analyzed a model of the hydraulic test system by using the AMESim software. Based on the analysis results, the judgments whether or not the test stand could meet the requirements is made.

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19

Yang, Lei, Dong Yun Wang, Wen Ya Chen, and Yan Weng. "The Application of Fuzzy PID on Hydraulic Universal Testing Machine." Advanced Materials Research 305 (July 2011): 335–39. http://dx.doi.org/10.4028/www.scientific.net/amr.305.335.

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The speed fluctuation rate is a bit large in the present universal hydraulic material testing machine, especially when automatic loading switch channels appeared in the process of speed fluctuation. In the meanwhile, when the oil temperature increases, the control effects would become worse. So a controller based on fuzzy self-adaptive PID algorithm is presented. Through fuzzy reasoning and constant amendment to various parameters, this method makes the control results more accurate. Test results show that the method can improve the three closed-loop control channel when switching speed fluctuation, overcome the adverse effects of temperature control effect, and meet the accuracy requirement of the standard loading of the material testing machine, which achieves good experimenting results.

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20

Stoten, D. P. "Implementation of Minimal Control Synthesis on a Servo-Hydraulic Testing Machine." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 206, no. 3 (August 1992): 189–94. http://dx.doi.org/10.1243/pime_proc_1992_206_330_02.

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The minimal control synthesis (MCS) algorithm is an adaptive controller that requires no prior knowledge of plant dynamic parameters, and yet is guaranteed to provide global asymptotic stability of the closed-loop system. The algorithm has been implemented on a variety of plant, ranging from laboratory-based rigs to industrial machines. The purpose of this technical note is to present the results of the first known implementation of the algorithm on a servo-hydraulically actuated machine. The results of the MCS implementation will be seen to compare very favourably with those of a conventional (P + I) implementation.

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21

Topliceanu, Liliana, Adrian Stelian Ghenadi, and Luminita Bibire. "Elements of Design and Dimensioning of Hydraulic System with Secondary Control." Applied Mechanics and Materials 436 (October 2013): 137–44. http://dx.doi.org/10.4028/www.scientific.net/amm.436.137.

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The hydraulic systems with secondary control have recently appeared and there are still a lot of possibilities to perfect them. This paper presents a conception of a hydraulic system with secondary adjustment working at a quasi-constant pressure and the necessary dimensional elements to construct the testing stand. Also the simulation of the system using MATLAB is presented.

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22

Ma, Nian Jie, Guo Dong Zhao, Chun Lei Ju, Wei Jiang, and Chong Li. "Research on Fully Mechanized Coal Face Hydraulic Support Selection Based on the Testing Principle of Floor Specific Pressure." Advanced Materials Research 217-218 (March 2011): 1637–40. http://dx.doi.org/10.4028/www.scientific.net/amr.217-218.1637.

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Interaction between coal face hydraulic support and floor is the crucial point for surrounding rock control in coal face and hydraulic support design optimization. Based on the principle of floor specific pressure testing, mechanized coal face hydraulic support parameters are tracked and such mechanical parameters as allowable specific pressure of floor strata are measured, in accordance with which this paper studies on the surrounding rock control in coal face and hydraulic support selection in fully mechanized coal face.

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23

Kiecana, Monika, Piotr Kanty, and Klaudia Łużyńska. "Optimal control time evaluation for “dry DSM” soil-cement composites." MATEC Web of Conferences 251 (2018): 01023. http://dx.doi.org/10.1051/matecconf/201825101023.

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Soil improvements with hydraulic binders are a widespread practice in foundation works. They vary depending on the mixing method (jet grouting hydraulic, deep soil mixing -mechanical), medium type (wet/water, dry/air) and binder type (cement, lime, fly ash or mixtures). The produced component’s strength changes in time thus its control should change in time as well. The paper presents the results of laboratory testing of an organic soil component mixed in dry method. The process of samples preparation and testing methodology of compressive strength and stiffness is described. Volatility of the parameters in time is considered. On the basis of the results, recommendation for optimal quality control time and its methodology for soil-cement components might be proposed.

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24

Zhou, Sheng Hao, Jun Kai Cao, and Jin Chun Song. "Design of Computer Measurement and Control System for Electro-Hydraulic Stepping Cylinder." Applied Mechanics and Materials 101-102 (September 2011): 1138–41. http://dx.doi.org/10.4028/www.scientific.net/amm.101-102.1138.

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To meet the requirements of measurement and control system for common servo-cylinder and considering the characteristics of electro-hydraulic stepping cylinder, a computer measurement and control system is designed. In this paper, the working principle of hydraulic system, the structure of electrical system, the process of measurements and the functions of testing software based on LabVIEW are introduced.

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25

Petranský, I., and M. Bolla. "Testing stand for life tests of hydrostatic pumps with a polluted fluid." Research in Agricultural Engineering 49, No. 4 (February 8, 2012): 151–56. http://dx.doi.org/10.17221/4966-rae.

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Testing of the lifetime of hydrostatic transmissions can be done on special testing stands. Some testing stands use a pressure valve connected at the outlet of a pump. When using this design of stands, it is important to keep clear the operating fluid by filters and it is not possible to observe the influence of fluid pollution on the lifetime. The article presents a design of an electro-hydraulic testing stand with computer control system for accelerated lifetime tests of hydrostatic pumps under laboratory conditions when using a polluted operating fluid. A pump, which is mechanically connected with a hydrostatic motor, through a clutch, is an interface between the hydrostatic circuit of the tested pump and the hydrostatic circuit of the loading simulator. At lifetime testing, this interface makes it possible to use the polluted fluid in the hydraulic circuit of the tested pump, and thereby observe its influence. Instead of a polluted fluid, it is possible to use biodegradable oil and observe its influence on the lifetime of a pump. When using the same hydraulic fluid in both systems of the stand, it is possible to test two pumps at the same time.

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26

Guo, W. Y., and Ming Yu Wu. "Design and Simulation of the Hydraulic Loading Control System of the Rolling Bearing Fatigue Life Testing Machine." Advanced Materials Research 852 (January 2014): 386–90. http://dx.doi.org/10.4028/www.scientific.net/amr.852.386.

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With the continuous expansion of China's bearing industry, rolling bearing life testing machine is becoming increasingly important in the enterprises. Due to its high cost and the complexity of controlling, it is relatively difficult to develop them. Therefore in the medium and small enterprises they are seldom used. In the present study we improve the hydraulic loading control system of the ABLT-5A rolling bearing life testing machine. In addition, we apply mathematical modeling for the control system and simulation analysis by MatLab software, in order to spread and promote the rolling bearing life testing machine in the medium and small enterprises, especially to conduct corresponding researches on the control precision and stability of the hydraulic loading control system.

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27

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

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

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28

Petrischev, N. A., and S. N. Sayapin. "Universal testing and diagnostic equipment for repair shops." Traktory i sel hozmashiny 79, no. 12 (December 15, 2012): 42–45. http://dx.doi.org/10.17816/0321-4443-65994.

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New universal testing and diagnostic equipment for the quality control of repair, adjustment and running-in of hydraulic drive aggregates and transmissions for tractors, vehicles and agricultural machines is presented.

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29

Zhang, Xin, Ji Long Zhao, and Qing Liang Zeng. "Study of the Testing System for Roadheader Pump and Motor." Applied Mechanics and Materials 727-728 (January 2015): 761–64. http://dx.doi.org/10.4028/www.scientific.net/amm.727-728.761.

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For the performance testing demands of roadheader hydraulic components, a hydraulic system of multi-interface and high-precision sensors is built and the signal acquisition and processing system based on PLC and data acquisition card high speed acquisition module is established. A software system based on LabWindows/CVI is developed. High precision, reliability, stable and functional test system is built by using precise sensor technology, electro-hydraulic proportional control technology and automation instrument technology, and then the pump and motor performance tests is completed. The system can simulate the actual working conditions of the pump and motor, making the test results more accurate and credible.

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30

Yang, Xiao Qiang, Ya Ming Gao, Ying Liu, and Jun Han. "Study on Universal Testing Platform of Engineering Machinery." Applied Mechanics and Materials 33 (October 2010): 544–48. http://dx.doi.org/10.4028/www.scientific.net/amm.33.544.

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Due to the multiple types and complexity of fault diagnosis, the general-purpose testing platform of engineering machinery’s hydraulic system is developed for the maintenance of military equipment. The general function and structure of the testing platform is presented. The hardware system consists of modular circuit, integrates control computer of embedded controller with PXI-interfaced modular instrument, program-controlled device, connector and adapter hardware. And the software program comprises data management module, fault diagnosis module coupled to the data acquisition module, signal processing module, experiment condition control module, database access module, system configuration and self-test as well as help module. Further, the hardware characteristics are showed and the principle of hydraulic testing platform is presented. The universal testing platform offers enormous benefits for fault diagnosis and condition monitoring of military equipment and machinery.

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31

Jablonický, Juraj, Pavel Máchal, Anton Žikla, Ján Kosiba, Ľubomír Hujo, and Vladislav Hajdák. "Comparing the Hydraulic Control of Tractor Three-point Hitch." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 62, no. 5 (2014): 939–44. http://dx.doi.org/10.11118/actaun201462050939.

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In this paper, there are monitored and compared the parameters of tractor three-point hitch control. Comparisons were carried out under laboratory conditions for two types of regulation. The first one was a standard mechanical and the second one was electro-hydraulic Bosch. Testing was performed on a test bench designed for the Department of Transport and Handling (Slovak University of Agriculture in Nitra). The results of measurements are evaluated statistically and shown in a graphical form.

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32

Kurilenko, N. I., and K. E. Kuzmenko. "Analysis of heat network testing methods." Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture 23, no. 6 (December 26, 2021): 172–78. http://dx.doi.org/10.31675/1607-1859-2021-23-6-172-178.

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Purpose: Improvement of the heat network testing and data collection methods. The analysis of heat losses, hydraulic resistance, and data processing. The testing methods are considered from the point of view of the data correctness obtained during the data collection.Methodology: Heat network testing and the data processing analysis.Findings: The paper determines the need to adjust the heat network testing methods for thermal and hydraulic losses.Practical implications: The calculation inaccuracy is identified, and a set of measures is proposed to clarify the results obtained. The obtained data can be used to evaluate the heat network testing methods.Value: Regulatory documents and engineering requirements for heat network testing of resource-supplying organizations are insufficient since they do not allow for the use of modern control methods and measuring equipment.

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33

Banaś, Michał. "Low-Speed Hydraulic Pump as a Tool for Setting and Measuring Torque." Solid State Phenomena 220-221 (January 2015): 969–73. http://dx.doi.org/10.4028/www.scientific.net/ssp.220-221.969.

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The paper presents a low-speed hydraulic pump which is used in a hydraulic load unit for testing mechanical devices. The control system of the unit reduces an impact of any other hydraulic and mechanical parameters, including temperature and rotational speed, on the torque. The hydraulic load unit with the low-speed pump was used in the tests of the cycloid gearbox.

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34

Na, Qi, Guosheng Feng, and Tixian Tian. "Real-Time Leak Detection in High Frequency Hydraulic Cylinder Based on Intelligent Control." Wireless Communications and Mobile Computing 2022 (September 25, 2022): 1–8. http://dx.doi.org/10.1155/2022/4753328.

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Most of the existing hydraulic cylinder internal leakage detection methods are laboratory testing methods, mainly the pressure-holding method, measurement of hydraulic cylinder settlement method, and measuring cup measurement method. The internal leakage of the hydraulic cylinder affects the damping characteristics of the control system. Therefore, real-time internal leakage detection plays an important role in the control characteristics. This paper first proposes a wavelet analysis-based extraction of hydraulic cylinder internal leakage fault eigenvalues for analysis, that is, data processing. A convolutional neural network-based detection method is also proposed, in which the pressure signal of a chamber of a hydraulic cylinder is first obtained through simulation under four operating conditions: no leakage, small leakage, medium leakage, and large leakage. Compared to traditional modelling methods, the method overcomes the difficulties in modelling nonlinear hydraulic systems, requires only pressure signal acquisition, is simple and reliable, and is compared with traditional BP neural networks to demonstrate its superiority.

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Wang, Xudong, Hanxiu Luo, Jianyu Zhao, and Tianmiao Hu. "RESEARCH ON FUZZY CONTROL STRATEGY OF ELECTRO-HYDRAULIC SERVO FATIGUE TESTING MACHINE." Proceedings of the JFPS International Symposium on Fluid Power 1996, no. 3 (1996): 561–65. http://dx.doi.org/10.5739/isfp.1996.561.

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Sun, Bei, Xue Man Zhang, and Kai Ge Sun. "The Oil Temperature Controlling of Hydraulic Pump Performance Test-System." Key Engineering Materials 561 (July 2013): 478–82. http://dx.doi.org/10.4028/www.scientific.net/kem.561.478.

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In the testing of the oil temperature controlling of hydraulic pump performance test-system, the changing of oil temperature bring the testing accuracy decrease, so it can influence nicety and contrast of test-bed. A computer device of oil temperature real time control are designed. The result of control achieve B level accuracy of international and guild. The software of computer is minimum variance correcting by oneself.

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Sang, Yun Hong, Liang Ma, Jian Ning, Shao Qing Li, and Yi Tian Sun. "Tractor Hydraulic Lighten Testing System Based on OPC Technology." Applied Mechanics and Materials 184-185 (June 2012): 614–20. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.614.

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This paper proposes a tractor hydraulic lighten testing system based on OPC technology. OPC technology is well applied to Tractor Hydraulic Lighten Testing System. The host computer can directly communicate with PLC and AD module through OPC technology.The control circuit is greatly simplified, the entire experiments can be completed on PC.The operation is convenient; the system is reliable;the program is easy to debug;test types can choose automatic or manual mode.The actual test results show that the performance of device is stable and reliable.The automation degree of the test system is greatly improved, and the labor intensity of operators is greatly reduced.

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Cai, Bao Ping, Yong Hong Liu, Yan Ting Zhang, Jiang Tao Ma, Yun Wei Zhang, Yu Juan Zhuang, Pei Wei Lu, and Yu Gui Luo. "Development of Test System for Subsea Tree Equipment." Applied Mechanics and Materials 440 (October 2013): 222–27. http://dx.doi.org/10.4028/www.scientific.net/amm.440.222.

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A test system for subsea tree equipment is developed for tree function testing after repair. The test system mainly consists of hydraulic unit and electric unit. The hydraulic unit is developed by revamping an old hydraulic power unit, which consist of six components, including reservoir, flush/fill pump circuit, high pressure hydraulic pump circuits, accumulator group, hydraulic supply circuits and fluid return circuit. The electric unit for subsea tree is developed by using NI Compact DAQ system, In order to control the hydraulic unit and acquire the pressure signals easily. The test procedures for flowloops, valve, and hydrostatic hydraulic pressure cycling are proposed based on the factory acceptance testing of subsea tree. A test for a repaired subsea tree is performed by using the developed test system. The results show that the repaired subsea tree is good enough after repair, and verify that the developed test system works well.

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Fu, Zhi Hao, and Yuan Sun. "PID control strategy of wind transmission chain based on particle swarm optimization." Journal of Physics: Conference Series 2355, no. 1 (October 1, 2022): 012058. http://dx.doi.org/10.1088/1742-6596/2355/1/012058.

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Abstract Wind turbine transmission chain is the key component of wind turbine to bear various loads, and its working characteristics are an important basis for testing the stability, reliability and safety of wind turbine. Aiming at the transmission chain system, a load simulation technology for ground test system of 1.5MW wind turbine transmission chain was proposed. According to its performance and requirements, a hydraulic loading system with 6-dOF load was designed. Hydraulic loading system is designed according to wind load. Through the mechanism method to establish its mathematical model, particle swarm optimization algorithm is easy to fall into the local optimal solution, using quantum particle swarm optimization algorithm, through Matlab/Simulink load simulation of the hydraulic loading system, the results show that the hydraulic loading system has a good tracking and reproduction of wind load

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Huang, Qitao, Peng Wang, Yuhao Wang, and Qinjun Yang. "Decoupling Control of a Multiaxis Hydraulic Servo Shaking Table Based on Dynamic Model." Shock and Vibration 2021 (November 23, 2021): 1–12. http://dx.doi.org/10.1155/2021/8268514.

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Hydraulic servo shaking table is an essential testing facility to simulate the actual vibration situation in real time. As a parallel mechanism, multiaxis hydraulic servo shaking table shows strong coupling characteristic among different degrees of freedom. When the multiaxis hydraulic shaking table moves to one direction, some unnecessary related motions will appear in other directions, which seriously affect the control performance. An effective approach to decouple motions in command direction and in unnecessary related directions is an urgent need for a higher precision control performance. In this work, the coupling phenomena and reasons of the multiaxis hydraulic servo table are analyzed based on dynamic model of a multiaxis hydraulic servo shaking table. In this regard, multiaxis hydraulic servo shaking table with strong coupling within the physical space is transformed into a set of single-input single-output systems that are independent of each other in the modal space. A decoupling control strategy is proposed in modal space to restrain the coupling motions. Simulation and experimental results show that the proposed control strategy can effectively improve the control performance and the decoupling effect.

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Chen, Dong Dong, Kun Peng Jiang, Da Wei Jiang, Chao Jun Yang, and Min Chen. "The Performance Testing System of Force Motor Valve." Applied Mechanics and Materials 635-637 (September 2014): 1382–85. http://dx.doi.org/10.4028/www.scientific.net/amm.635-637.1382.

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Hitachi force motor valve has been widely used in the hydraulic automatic gauge control (AGC) system of rolling mill due to the characteristics of fast response, high control accuracy and strong anti-pollution ability. It is an important part to control the steel production cost by detecting the performance index of the FMV effectively and in real time. Traditional Servo valve test system detects its static characteristics through the flow and pressure changes between the traffic cavity, and this principle can solve the three position four way servo valve performance test. However, FMV is a special three-way valve and it is hard to test its static characteristic curve like three position four way servo valve. This paper proposes a FMV testing method and has realized it. The test platform is designed and built according to the hydraulic valve testing performance index for detecting the performance of a force motor valve. Not only were force motor valve (FMV) performance characteristics tested effectively but also the performance curves were drawn. The results show that the FMV performance testing method we have built can be effectively used to detect the static performance index of FMV.

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Favour, John. "Design and Control of a High Velocity, High Force Hydraulic Shock Test Machine." Journal of the IEST 29, no. 2 (March 1, 1986): 54–57. http://dx.doi.org/10.17764/jiet.1.29.2.h7n803771467xp3g.

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This paper discusses the design and control of a large hydraulic shock testing device. The system is capable of peak velocities up to 10.2 m/s (400 in/sec) and peak forces up to 801 kN (180,000 lbs). The major challenges discussed are: 1) the concept design, 2) the specification and procurement of two very large (2500 gpm) electro-hydraulic servovalves and 3) the failsafe control of the servovalves and system response. The system performance is briefly discussed.

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Guan, Guang-feng, and AR Plummer. "Acceleration decoupling control of 6 degrees of freedom electro-hydraulic shaking table." Journal of Vibration and Control 25, no. 21-22 (August 12, 2019): 2758–68. http://dx.doi.org/10.1177/1077546319870620.

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Electro-hydraulic shaking tables are widely used for vibration testing where high force and displacement amplitudes are required. In particular, they are a vital tool in seismic testing, enabling the development of buildings and other structures which are earthquake resistant. Three-variable-control (TVC) is commonly used for the control of multi-degrees of freedom (DOFs) electro-hydraulic shaking tables. However, the coupling between the DOFs is often significant and is not compensated by TVC. In this paper, an acceleration decoupling control (ADC) method is presented for a 6 DOFs electro-hydraulic shaking table system to improve the acceleration tracking performance and decouple the motion in task space. The gravitational, Coriolis, and centripetal forces are compensated for in joint space based on a dynamic model of the shaking table. Modal control is used to transform the coupled dynamics into six independent systems. Inverse dynamics models are used to cancel the differences in actuator dynamics. The proportional gains in modal space are tuned heuristically to give sufficient stability margins to provide robustness in the presence of modeling errors. The input filter and feedforward controller in TVC are added to improve the acceleration tracking performance of each independent system. Experimental acceleration frequency responses are used to demonstrate the effectiveness of ADC, and in particular these show a consistent reduction in cross-axis coupling compared to TVC. Moreover, only four parameters need to be tuned, as opposed to 36 for TVC, and the method provides a viable route to improving the accuracy of seismic testing in the future.

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Scoffoni, Christine, Grace John, Herve Cochard, and Lawren Sack. "Testing for ion-mediated enhancement of the hydraulic conductance of the leaf xylem in diverse angiosperms." Journal of Plant Hydraulics 4 (April 26, 2017): e004. http://dx.doi.org/10.20870/jph.2017.e004.

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Replacing ultra-pure water solution with ion solution closer to the composition of natural xylem sap increases stem hydraulic conductance by up to 58%, likely due to changes in electroviscosity in the pit membrane pores. This effect has been proposed to contribute to the control of plant hydraulic and stomatal conductance and potentially to influence on carbon balance during dehydration. However, this effect has never been directly tested for leaf xylem, which constitutes a major bottleneck in the whole plant. We tested for an ion-mediated increase in the hydraulic conductance of the leaf xylem (Kx) for seven species diverse in phylogeny and drought tolerance. Across species, no significant changes in Kx were observed between 0 and 15 mM KCl. We further tested for an effect of ion solution during measurements of Kx vulnerability to dehydration in Quercus agrifolia and found no significant impact. These results for leaf xylem contrast with the often strong ion effect reported for stems, and we suggest several hypotheses to account for the difference, relating to the structure of xylem conduits across vein orders, and the ultrastructure of leaf xylem pores. A negligible ion response in leaves would weaken xylem sap ion-mediated control of plant hydraulic conductance, facilitating modeling of whole plant hydraulic behavior and its influence on productivity.

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Yang, Jiachen, and Xiajie Jin. "Application of fuzzy control in power recovery testing of hydraulic pump and motor." IOP Conference Series: Earth and Environmental Science 330 (November 8, 2019): 052028. http://dx.doi.org/10.1088/1755-1315/330/5/052028.

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Deticek, E., and E. Kiker. "AN ADAPTIVE FORCE CONTROL OF HYDRAULIC DRIVES OF FACILITY FOR TESTING MECHANICAL CONSTRUCTIONS." Experimental Techniques 25, no. 1 (January 2001): 35–39. http://dx.doi.org/10.1111/j.1747-1567.2001.tb00006.x.

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Xu, Ming, Jing Ni, and Guo Jin Chen. "Research on the Broaching-Load Testing System of Hydraulic Broaching Machine." Advanced Materials Research 328-330 (September 2011): 1709–12. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.1709.

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In view of the disadvantages on working vibration or even cannot work of broaching machine derived by broaching-load’s uncertainty, a testing system of broaching-load is designed. The testing system uses an industrial computer, a high-precision data-acquisition-card, two pressure-sensors, a displacement-sensor and Borland C++ to test the broaching-load on the base of broaching machine’s electronic control system. The factual application in hydraulic broaching machine shows that the proposed system has a good performance on testing-accuracy. The proposed system gives an effective solution to broaching-load testing.

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Guo, Xin, Guo Liang Bai, and Peng Sun. "Implementation of Data Record Simultaneously in Seismic PSD Test." Applied Mechanics and Materials 204-208 (October 2012): 2433–39. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.2433.

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Civil experimental system consists of electric-hydraulic servo-controlled testing machine and the data logger in which the recorded data are saved. In Electro-hydraulic servo controller, a exterior trigger signal is used to remote control the data logger working, and the problem of data record synchronously is solved in on-line processing of servo testing machine and data logger, which quicken the test speed by making program calculation and command control simultaneously. The case based on digital command control for pseudo-dynamic on-line test for hybrid structure of thermal power plant is described, by which the data record simultaneously in pseudo-dynamic test achieved automatically. The research provides important reference value for the same type of on-line experiment.

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Kasprzyczak, L. M., J. R. Słowik, and Ewald Macha. "A Computer Control System for the Hydraulic Stand MZPK 100 for Biaxial Fatigue Testing." Solid State Phenomena 113 (June 2006): 13–18. http://dx.doi.org/10.4028/www.scientific.net/ssp.113.13.

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This paper presents a two-channel digital control system for the hydraulic stand MZPK 100 designed for fatigue tests of cruciform specimens under biaxial tension-compression. In the past, the fatigue test stand MZPK 100 was provided with unreliable analog control power cubicles. Application of the computer with an analog and digital input-output signal path board, Matlab/Simulink software and a new control box equipped with the necessary electronic subassemblies (responsible for proper switching of the hydraulic supplier, command electrovalves, conditioning of signals from sensors and so on) enables replacement of the old analog system by a new two-channel digital control system. Nowadays, it is easy to modify the control system to different requirements of material tests because the hardware (electronic) solutions have been simplified, and the software has a friendly Simulink interface. Such an approach allows for the implementation of different control algorithms, e.g. PID, adaptive, and fuzzy logic etc. Moreover, this paper presents a description of how to keep the center of the specimen static under a controlled force that is being applied by four independent actuators.

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Gruber, Y., D. Farchill, and M. Goldstein. "Design, Testing and Operation of Grit Chambers with Hydraulic Roll." Water Science and Technology 20, no. 4-5 (April 1, 1988): 237–48. http://dx.doi.org/10.2166/wst.1988.0172.

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The Soreq biological treatment plant has been recently brought into operation, after a comprehensive start-up and testing program. The plant's preliminary treatment facilities include four grit chambers 40 m long, equipped for both grit removal and scum skimming. The variable energy input required to control the deposition of the grit and the floating of the scum, is provided by a hydraulic jet system, using pumped recycled wastewater to generate the necessary motive power. The basic concept in designing grit chambers equipped with a hydraulic jet system, instead of a bubble aeration system, is to avoid the release of noxious odours and corrosive gases which are often associated with the conventional aerated grit chambers. Experiments were conducted on a hydraulic model of the grit chamber to develop the necessary design criteria for the full scale jet system. During the initial start-up program of the Soreq plant, the grit chambers and the related equipment were tested with clear water, and the actual transversal velocities were measured through a range of simulated operating conditions. This paper summarizes the hydraulic model test results, the upscaling approach used for design of the prototype system, and the on-site full-scale tests with clear water. A follow-up program under actual operating conditions is now in progress to establish the variable parameters for optimal operation of the hydraulically powered grit chambers with wastewater.

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