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Journal articles on the topic 'Hydraulic drive system'
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1
Ivanov, Konstantin Samson, and Baurjan Tultayev. "Adaptive Hydraulic Drive of Manipulator." Applied Mechanics and Materials 841 (June 2016): 215–20. http://dx.doi.org/10.4028/www.scientific.net/amm.841.215.
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At present in manipulators the hydraulic drives with one degree of freedom are used. Such drive provides single-valued function of constraint between input and output links motion. However for overcoming of variable force of resistance it is necessary to use the variable transfer ratio between input and output links. The adjustable drive should contain the controlled gear box. Such drive contradicts the demand of minimization of weight and sizes of modules of the manipulator. Use of electronic control systems for force regulating leads to extreme complication of drives, decrease in their reliability, raise of cost of manufacturing and maintenance.Recently the adaptive self-controlled mechanical systems were appeared. By analogy to the adaptive mechanism the hydraulic adaptive mechanism which provides force self-regulation without a control system has been developed and the patent for invention was received.In paper the description and research of the adaptive hydraulic mechanism and creation of the manipulator module with the simplest compact hydraulic drive are adduced.
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INOGUCHI, Rikiya, Kazuhisa ITO, and Shigeru IKEO. "Pure-Hydraulic Hybrid Cylinder Drive System with Hydraulic Transformer." JFPS International Journal of Fluid Power System 5, no. 1 (2012): 1–5. http://dx.doi.org/10.5739/jfpsij.5.1.
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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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KOSUGI, Akira, Mizuho NAKAMURA, Shigenobu SUZUKI, Masanobu CHIBA, and Keigo HARA. "Research on Interlock System in Hydraulic drive system." Proceedings of Mechanical Engineering Congress, Japan 2016 (2016): G1700203. http://dx.doi.org/10.1299/jsmemecj.2016.g1700203.
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Xu, Ming, Xiao-meng Wu, Xin Yu, and Guo-jin Chen. "Dynamic performance of auxiliary hydraulic power unit based electro-hydraulic variable speed drive system." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 16 (August 24, 2017): 2926–36. http://dx.doi.org/10.1177/0954406217727770.
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Inability of dynamic performances, especially the acceleration response, strongly inhibits the application of electro-hydraulic variable speed drive, even though its intrinsic energy-saving potential. In contrast to variable speed drive, the valve-controlled actuator system shows the capacity of fast response and accurate control precision, but it consumes more energy. The controllable auxiliary power unit based electro-hydraulic variable speed drive system is probably a solution to enhance dynamic performance of variable speed drive on the basis of energy-saving. Except for the principal variable speed power source, there is an auxiliary power source—auxiliary power unit, which is actually a semi-active hydraulic accumulator unit. The auxiliary power unit can detect the relation between the supplied power by power source and the demanded power by actuator, and then release or absorb hydraulic power to improve actuator dynamic response. The dynamic performance of auxiliary power unit based variable speed drive system was investigated experimentally. Firstly, the set-up of proposed drive system was introduced. Dedicated to the complicated characteristics of multi-input-multi-output and strongly nonlinearity, the mathematical model was deduced, and a hierarchical control strategy was illustrated. The experimental results under two typical variable-load conditions were discussed. Furthermore, the comparisons were explained with the other three drive systems, which were valve-controlled motor drive, conventional variable speed drive, and pump-valve compound drive. Based on the experimental results, it is concluded that the auxiliary power unit based variable speed drive demonstrates an excellent dynamic performance, which can significantly improve the actuator response and control precision, as well as obtain a good energy-saving behavior.
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Devisilov, V., and E. Sharai. "Hydrodynamic filters in hydraulic fluid cleaning system of hydraulic drive." IOP Conference Series: Materials Science and Engineering 492 (March 13, 2019): 012025. http://dx.doi.org/10.1088/1757-899x/492/1/012025.
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Cao, You Hui, Jin Liu, Li Fu Shao, Fei Liu, and Wen Qun Xu. "Intelligent Driver Designing for Electro-Hydraulic Proportional Valve of Engineering Machine." Advanced Materials Research 562-564 (August 2012): 1108–12. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.1108.
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Intelligent driver based on C8051F500 and TLE7242-2G for electro-hydraulic proportional valve was designed in this paper. The driver has CAN interface, and can drive four channel electro-hydraulic proportional valves. The system scheme, power unit, MCU unit, drive unit and software were analyzed in detail. At last the system performance was simulated with MATLAB. The Intelligent driver is suit for modern engineering machine’s control system, which demands networking and distributed control.
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Rutkevych, Volodymyr. "INVESTIGATION OF TRANSITIONAL PROCESSES IN THE ADAPTIVE SYSTEM OF HYDRAULIC DRIVES OF THE MECHANISM FOR CUTTING AND UNLOADING STALK FODDER." Vibrations in engineering and technology, no. 2(101) (June 29, 2021): 107–14. http://dx.doi.org/10.37128/2306-8744-2021-2-12.
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The problem of creating an energy-efficient and competitive mechanism for cutting and unloading stalk fodder from trench storage, by developing and justifying the parameters and modes of operation of the adaptive system of hydraulic drives of the mechanism is researched. The principal implementation of the adaptive system of hydraulic drive of the mechanism for cutting and unloading is proposed, in which a spool flow divider is placed between two executive hydraulic motors, which allows to regulate the supply of a U–shaped frame according to the load change which affects the cutting mechanism. The adaptive system of the hydraulic drive of the mechanism allows to stabilize energy consumption for separation of a portion of a stalk fodder under the condition of change and fluctuation of parameters which essentially influence the process of separation and unloading of a stalk fodder from the monolith. The transients in the adaptive systems of hydraulic drives of the mechanism for cutting and unloading of stalk fodder are received and analyzed. As a result of the study, it was found that by changing the operating widths of the slide valve of the separator in the direction of reduction, a significant increase in the responsiveness of the hydraulic drive system of the mechanism for cutting and unloading to the changes in the loading on the cutting apparatus. As a result, the range of the adjustment of the feeding of the hydraulic cylinder of the U–shaped frame, which increases the efficiency of stabilizing the separation process from the monolith of block-portion of stalk fodder with a minimum power of the hydraulic drive system, is substantially expanded. It is noted that the dynamic characteristics of the hydraulic drive of the mechanism for cutting and unloading stalk fodder adaptive to the load are influenced by the design parameters of the spool flow divider which implements feedback. On the basis of the conducted experimental research recommendations on the choice of constructive parameters of the spool flow divider are given.
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Khristoforov, Evgeniy, Nataliya Sakovich, and Aleksandr Kuznecov. "SAFETY SUPPORT IN TRANSPORT CONSTRUCTION MACHINERY WITH HYDRAULIC DRIVE." Bulletin of Bryansk state technical university 2021, no. 7 (June 16, 2021): 38–49. http://dx.doi.org/10.30987/1999-8775-2021-7-38-49.
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Work purpose: the investigation of transport process safety in construction industry of the Bryansk region, the substantiation of reasons, factors and circumstances of accidents in the construction companies of the region, the substantiation of the impact of hydraulic drive unit failures upon safety of transport construction machinery with the hydraulic drive with the purpose of driver safety.
Investigation problem: on the basis of the obtained results of the safety investigations of transport processes, reasons defined, revealed injury factors of drivers during the operation of the load flat car hydraulic drive of transport means to develop motion parameters of the “hydraulic drive-load flat car” system which will not allow arising oscillations of the system resulting in hydraulic drive failure arising which has influence upon driver’s work safety.
The investigations were carried out on the basis of a system analysis of accident examinations in the regional construction industry which on the basis of statistical data allows the defining safety state of transport construction machinery. By means of investigations it is defined that 90% of transport construction machines are equipped with a hydraulic drive. In the hydraulic drive the most significant element is a hydraulic cylinder – the most loaded element performing all basic operations of a working process of loading and unloading. In the hydraulic drive there is used a telescopic hydraulic cylinder in which during operation there are revealed design-production defects (DPD) which result in injury of machine service personnel. One of DPD manifestations is oscillation formation in the hydraulic drive which results in the destruction of hydraulic cylinder attachment fitting. It is defined that the support of hydraulic drive reliability and safety is a difficult problem which needs a complex solution still at designing and creation, and during the operation. The complexity of the problem causes the necessity of design and operation parameter optimization, in the first place, that of an executing hydraulic cylinder of the hydraulic drive with the use of mathematical modeling. The review of the mathematical modeling methods of hydraulic cylinder parameters allows drawing the conclusion that the existing methods have many assumptions and do not allow creating completely reliable and safe transport construction engineering.
The investigation novelty consists in the offered procedure for the solution of motion equations of the “hydraulic drive – load flat car” system which allows calculating the motion system parameters, defining the development of system oscillation above critical able to destruct a fitting unit of the hydraulic cylinder to the load flat car.
Conclusion. The algorithm offered for the solution of mathematical equations allows making a conclusion on the stability and safety of the “hydraulic cylinder – load flat car” system, finding optimum values of motion parameters at any time moment of a transitional process.
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Popov, A. Y. U. "Simulation modeling of the volumetric hydraulic drive." Traktory i sel hozmashiny 85, no. 3 (June 15, 2018): 45–53. http://dx.doi.org/10.17816/0321-4443-66397.
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In the design of a variety of the modern agricultural machines, the hydraulic drive with reciprocating motion for lifting, lowering and moving the working bodies has obtained a wide application. One of the important stages in the design of hydraulic drives and transmissions is a simulation. In connection with the laboriousness of carrying out the full-scale experiment and the cumbersome calculation of mathematical models of hydrosystems, as well as the development of the computing machinery, the simulation modeling has obtained a widespread usage. This type of computer simulation allows to investigate complex systems based on the development of multilink factor models with the visualization of a numerical experiment. The article presents the procedure for the simulation modeling of dynamic processes occurring in the volumetric hydraulic drive. The model is developed on the basis of standard libraries of the computing system MATLAB Simulink. The volumetric hydraulic drive is presented in the form of a structural model and consists of interconnected blocks that on the base of differential equations modeling the operation of a pumping station with a mechanical drive, a safety valve, a three-section four-line hydraulic distributor, double-acting power cylinder with special rod, a hydraulic tank. During the calculation of the simulation model takes into account a change of the modulus of elasticity of the fluid depending on the pressure in the hydraulic system, the parameters of the working fluid, the stiff stop when the extreme positions are reached by the rod of the hydraulic cylinder, the friction between the moving parts in the power hydrocylinder. The developed program allows to simulate working processes at the design stage and obtain the necessary data on the dynamic properties of the hydraulic system in all modes of operation, to demonstrate in the form of graphs and oscillograms, to simplify the analysis of transient processes in the hydraulic system, and also to select the rational design parameters of constituent elements of the volumetric hydraulic drive.
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Kosucki, Andrzej, Łukasz Stawiński, Adrian Morawiec, and Jarosław Goszczak. "Electro-Hydraulic Drive of the Variable Ratio Lifting Device under Active Load." Strojniški vestnik – Journal of Mechanical Engineering, no. 11 (November 23, 2021): 599–610. http://dx.doi.org/10.5545/sv-jme.2021.7320.
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Hydraulic systems fed by fixed displacement pumps driven by frequency-controlled electric motors can replace conventional throttling systems due to their ability to control the speed of hydraulic cylinders regardless of the value and direction of the load. These systems can improve the energy efficiency of the drive or even provide the possibility of energy recuperation during lowering. This paper presents experimental studies of the new drive system with volumetric control of the speed of the lifted/lowered payload using the example of a scissor lift. The system uses a reversible gear pump driven by an asynchronous motor fed by a frequency inverter operating in field-oriented control mode. Comparative studies of the mapping of the assumed speed of the hydraulic cylinder and platform are presented, as well as studies of the influence of the load change on the speed and positioning of the mechanism driven by the open-loop controlled system.
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John A. Collier and David M. McLaughlin. "A Diesel-Hydraulic Oyster Harvester Drive System." Applied Engineering in Agriculture 3, no. 2 (1987): 143–44. http://dx.doi.org/10.13031/2013.26661.
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Xing, Pu, Shi Lin Luo, Cun Bo Liu, and Cong Feng Tian. "Simulation of Hydrostatic Drive System of Crawler Bulldozer." Advanced Materials Research 243-249 (May 2011): 6178–82. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.6178.
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According to the hydraulic driven system working principle of crawler bulldozer, the simulation model of electro-hydraulic proportional control driven system was established by using AMESim, and the simulation was carried out. The simulation result indicates that using feedback regulation in control of hydraulic motor of driven system, the system pressure stay in a relatively stable state, which is conducive to the efficient operation system. As the load increasing suddenly, the system pressure volatile during the volume of hydraulic motor changing. However, steady state can be quickly restored.
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Li, Shigang, Dandan Liu, and Bin Xie. "The Control System Design of Hydraulic Hybrid Vehicle Based on CAN Bus." Open Mechanical Engineering Journal 8, no. 1 (December 31, 2014): 739–43. http://dx.doi.org/10.2174/1874155x01408010739.
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The hybrid vehicle is a new type of green and energy efficient vehicle. Hydraulic accumulator and variable pump/motor make up the break energy regeneration utilization system, which is the core of hydraulic auxiliary driving unit. The hybrid drive system is composed of hydraulic auxiliary driving unit and the original vehicle drive system. As it relates to the recovery of the braking energy and the situation of two kinds of power-driven vehicle, it brings complexity to the hybrid distribution strategy, and an efficient energy control system is necessary. Based on CAN bus technology, using the CAN2.0B communication protocol for the system design, the core hardware system is composed of PC/104 computer and CAN communication card, the key nodes of hydraulic auxiliary drive unit use DSP chip TMS320LF2407. Experiments show that the system has a high communication reliability and high accuracy of dynamic coupling, the safety of vehicles and the best energy matching.
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Shargorodskiy, Serhiy, Volodymyr Rutkevych, and Evhenyy Yaschcuk. "MATHEMATICAL MODELING OF THE HYDRAULIC DRIVE OF THE SECTIONS OF A WIDE-COLLECTING CULTIVATOR WITH SEQUENTIAL ACTIVATION OF HYDRAULIC CYLINDERS." ENGINEERING, ENERGY, TRANSPORT AIC, no. 4(115) (December 24, 2021): 148–58. http://dx.doi.org/10.37128/2520-6168-2021-4-17.
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The publication discusses the issues of mathematical modeling of dynamic processes occurring in a complex hydromechanical system of the hydraulic drive of the wide-cut cultivator sections with consistent wear of the hydraulic cylinders. The analysis of known designs of wide-cutting tools and agricultural units is carried out. It is noted that one of the tendencies in the development of domestic agricultural engineering is an increase in the width of coverage of tillage machines. In this regard, hydraulic drives for decomposition and assembly of sections of these machines are widely used. The use of this type of drive is due to its compactness, speed and power. The basic schematic diagrams of hydraulic drives for decomposition of wide-cut tillage machines are considered. On the basis of the analysis, a schematic diagram of the hydraulic drive for assembling (decomposing) sections of a wide-grip cultivator with sequential actuation of hydraulic cylinders is proposed and the principle of its operation is described. A mathematical model has been developed for the hydraulic drive of the wide-grip cultivator sections in the working and transport position. The mathematical model consists of the equations of the continuity of the flows of the working fluid, which describe the processes occurring in the hydraulic drive, and the equations of moments and forces, from which it is possible to determine the force factors acting on the elements of the system. It is difficult to obtain an analytical solution to the resulting system of equations, therefore, to find solutions, numerous methods were applied, namely the Runge-Kutta-Feldberg method with an automatic change in the integration step. On the basis of the obtained dependencies, an analysis of the operation of the hydraulic drive with sequential wear of the hydraulic cylinders was carried out and recommendations were proposed on the design device and directions for improving the hydraulic drive of the tillage unit sections.
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Jozef Krilek, Jozef, Jan Kovach, Tomash Kuvik, and Lucia Dobrotova. "Analysis of the hydraulic oil to drive band sawmill." Scientific Bulletin of UNFU 29, no. 10 (December 26, 2019): 89–92. http://dx.doi.org/10.36930/40291018.
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Transport and material handling is a sum of technological processes in the wood-processing industry. Hydraulic drives are one of the drive options used as a basic part of the transport – handling machines. Contamination control involves preventing contaminants from entering a hydraulic system and placing filters in strategic locations throughout the system to trap any contaminants to find their way into the fluid. But for critical equipment, a successful contamination control program must also include regular assessment of the hydraulic fluid cleanliness. It must be often done every two to six months or after every 500 or 1,000 hours of operation, depending on the equipment duty cycle, operating environment, and how critical it is to overall operation. Pressure forces in hydraulic drives are transferred to hydraulically-operated devices which also serve to lubricate the elements, displace and remove heat from the system. To increase the service life of hydraulic drives, hydraulic oil must meet individual physical characteristics. To ensure reliability, timely diagnosis of hydraulic oil is required. Some experts also recommend that fluid to be tested immediately after any maintenance event that exposes the hydraulic system to the external environment. This could occur when a hose or other component is replaced or fluid is added to the reservoir. Fluid replenishment can be particularly troublesome because new fluid is notorious for being dirty – often from improper storage and handling practices. The article deals with the methodology of measuring the basic physical properties of hydraulic oil by the respective diagnostic devices directly on the hydraulic drive of the bend saw in the full operation of the machine. The methodology suggested enables making decisions for improvement of the hydraulic oil state.
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Shi, Yuanling, and Pingsong Zhang. "Modeling and Dynamic Performance Analysis of Hydraulic Top Drive Main Transmission System with Long Hydraulic Pipelines." Geofluids 2022 (April 16, 2022): 1–15. http://dx.doi.org/10.1155/2022/1304176.
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Hydraulic top drive is the main power component used to drive drilling tools rotating to drill a hole for drilling rigs. Its main transmission system was built with hydraulic power source and hydraulic actuators. During the drilling procession, the hydraulic top drive is mounted on a derrick, and moving along its vertical guide rails. The hydraulic power station is usually placed on the drilling platform or the ground. In that way, long pipelines are needed to connect the hydraulic pumps and hydraulic motors. Thus, the effects on the performance of hydraulic top drive should not be neglected. A mathematical model of hydraulic top drive main transmission with differential equation of hydraulic units and state space equation of hydraulic long pipelines was deduced in this research. A simulation model was built using the AMESim software. And field drilling test of the hydraulic top drive was carried out in Songliao Basin Drilling Project (SK-II) well site. To verify and modify the virtual model, a comparison analysis was performed by setting the parameters and load of the three methods at the same values. The result of comparison shows that the simulation results are very close to the theoretical results and field drilling test data. Thus, the dynamic characteristics could be analyzed by this simulation model. Dynamic characteristics of the hydraulic top drive with different length and various diameters of pipelines were studied. The simulation results demonstrate that pipeline lengths and pipeline diameters affect the system in different laws, and it needs to comprehensively consider the system response speed, overshoot, and steady-state characteristics when choosing the size of pipelines for hydraulic top drive.
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Zhang, Ji Ping, Xin Ping Han, Shi Jin Ma, and Jing Cheng Zhang. "Full Hydraulic and Control Systems Application in Open-Cut Mine Drill." Applied Mechanics and Materials 318 (May 2013): 91–95. http://dx.doi.org/10.4028/www.scientific.net/amm.318.91.
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The LWD-200B full hydraulic open cut mine drill's hydraulic system uses a variable displacement pump with load sensing constant power, load sensitive electromagnetic proportional multi-way directional valve, high torque hydraulic motor overhead direct drive rotary head, a long stroke hydraulic cylinder and steel wire rope and pulley speed lifting system, hydraulic cylinder to drive the unloading rod mechanism, hydraulic motor driving crawler, double hydraulic cylinder lifting the drill frame mechanism, a hydraulic motor driven cable winding drum, hydraulic legs leveling method. Control system adopts the control handle and the PLC control mode, with real-time data acquisition, computer automatic recognition of lithology and closed loop feedback control and GPS precise positioning function, to achieving the automatic or manual drilling, specified depth or level drilling. Through the test of practice, it is a multifunctional, fully hydraulic, which is intelligent and efficient perforation equipment.
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Yue, Jing Tao, Hui Pu, and Xiao Jun Wei. "The Transitional Simulation of Self-Propelled Winch System by the AMESim." Applied Mechanics and Materials 687-691 (November 2014): 228–31. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.228.
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The self-propelled winch system was studied taking the 20-ton transitional self-driven winch system as the engineering background. By the analysis of structural characteristics, control loops, speed solutions and hydraulic motor-driven forms of winch hydraulic system, The system of mathematical models was established which lay the foundation of the establishment of system simulation model. The walking hydraulic drive system simulation models were established by using AMESim software. On this basis, by setting different parameters, the simulation system operating conditions are simulated, which verified the rationality and stability of the design of the winch hydraulic transmission system.
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Huang, Guo Qing, Yu Chen, and Jin Yu. "Simulation Analysis in Cylinder Hydraulic Synchronous Control System of Main Drive System of Heavy Forging Hydraulic Press." Advanced Materials Research 765-767 (September 2013): 1899–902. http://dx.doi.org/10.4028/www.scientific.net/amr.765-767.1899.
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An overly large passive synchronization system will be needed in a Heavy forging hydraulic press while entirely relying on passive compensation. And it will increase developing and maintain costs of the equipment. Therefore the main drive system should be considered. The paper developed mathematical model of the cylinder of the main drive system from the perspective of the main drive system of the heavy forging hydraulic press; the eccentric load points, load size and speed of moving beam are the three major factors that influence the synchronization of cylinders. Synchronous Controller was linked in the active corrective procedures and simulated based on Simulink, simulating results show that the eccentric load points have the biggest influence on the cylinder synchronization, while the speed produces smaller effect.
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Rutkevych, Volodymyr, Vitalii Yaropud, Igor Kupchuk, and Oleksandr Ostapchuk. "SIMULATION MODELING AND RESEARCH WORKS OF THE HYDRAULIC DRIVE OF THE STEM SEPARATOR FEED FROM TRENCH STORAGE." Vibrations in engineering and technology, no. 3(102) (September 28, 2021): 88–99. http://dx.doi.org/10.37128/2306-8744-2021-3-10.
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The issue of accelerated creation of efficient and energy-saving hydraulic drive of stem forage separator from trench storages by simulation modeling of technical systems. It is noted that the use of simulation allows to avoid significant investments required for the manufacture of a prototype of an agricultural machine, provided a detailed study physical model of the hydraulic drive of the stem feed separator. And also allows you to check the adequacy of the results obtained in process of mathematical modeling, and determine the necessary improvement of the proposed hydraulic drive. A fundamentally new constructive-technological scheme is presented stem feed separator from trench storage that allows to carry out process of unloading of a stalk forage from trench storages according to zootechnical requirements. The stand for simulation modeling of transients in the hydraulic drive of the stem forage separator from trench storages is offered. The design of the experimental stand also allows to investigate the hydraulic drive of the stem feed separator in the dynamic mode, when changing the technological load on the working bodies and changing the parameters of the adaptive fluid flow separator and the system in general. As a result of research and analysis of transients in the hydraulic drive, a fairly close coincidence of the results of mathematical and simulation modeling of the hydraulic drive of the stem feed separator, which allows us to recommend obtaining the calculated dependencies for use in the development hydraulic drives of stem feed separators.
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BAKIROV SERGEY M., SERGEY M. "RATIONALE FOR THE APPLICABILITY LIMITS OF POWER SUPPLY SYSTEMS OF SPRINKLERS." Agricultural engineering, no. 5 (2020): 49–56. http://dx.doi.org/10.26897/2687-1149-2020-5-49-56.
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Diff erent power supply systems with hydraulic, electric and mechanical drive are used in sprinklers for watering crops of the same type. Depending on the agrotechnical operating conditions of sprinklers, the systems diff er from each other in terms of energy and operating costs in 1.5…4.2 times. The paper considers a problem of choosing the optimal power supply system for a sprinkler unit working under specifi c conditions. The author has examined power supply systems for sprinklers: a hydraulic drive with a rotating hydraulic motor; a hydraulic drive with a reciprocating hydraulic motor; a mechanical drive; an electric drive powered by a cable line, an overhead line, a portable generator or accumulator batteries, which are all characterized by an individual resulting quality indicator. This indicator can be represented by any parameter of the system. Applying the theory of vector synthesis, he has chosen the effi ciency criterion as an indicator that takes into account the system parameters: specifi c power, energy losses, reliability indicator, operating costs, cost and mass of the system elements; as well as agrotechnical conditions: inlet pressure, distance from the water reservoir and centralized energy supply system, investments in sprinklers, irrigation rate, irrigation area and irrigation profi t. According to the effi ciency criterion, a graphical solution to the problem has been presented and it has been established that systems with an electric drive and various power sources are feasible for areas of more than 40 hectares, those with a hydraulic drive – for an irrigated area of less than 40 hectares, and those with a mechanical drive – less than 6 hectares.
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Minav, Tatiana, Jani Heikkinen, Thomas Schimmel, and Matti Pietola. "Direct Driven Hydraulic Drive: Effect of Oil on Efficiency in Sub-Zero Conditions." Energies 12, no. 2 (January 11, 2019): 219. http://dx.doi.org/10.3390/en12020219.
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Direct driven hydraulic drives (DDH) have the advantages of compact high power density in hydraulic systems and flexible control of electric motors. These advantages can benefit non-road mobile machinery (NRMM) applications. However, maintaining high efficiency while working in sub-zero conditions with NRMM is challenging. Therefore, this paper investigates the effect of hydraulic oil on the efficiency of a DDH in a cold environment for an NRMM application. In the DDH setup, the speed and position control of a double-acting cylinder was implemented directly with an electric motor drive in a closed-loop system without the conventional control valves. Efficiency measurements of the DDH setup with two oils (conventional multi-grade and high-performance) were conducted under different operating conditions (speed and payload) and environmental conditions (temperature in °C). The paper provides an evaluation of the electro-hydraulic system and a discussion on the usage of hydraulic oil by non-road mobile working machines in sub-zero conditions. An experimental investigation demonstrated an improvement in efficiency of 5%-unit at 22 °C, from 2%-unit to 5%-unit at 3 °C, and of almost a 10%-unit at temperatures below zero (−10 °C) by changing oil.
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Zhang, Zhu Xin, and Tuo Jia. "Direct-Drive Differential Volume Control Electro-Hydraulic Servo Control System." Applied Mechanics and Materials 433-435 (October 2013): 991–94. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.991.
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Direct-drive volume control electro-hydraulic servo control system, derivation model of single-rod hydraulic cylinder system, pointed out that when the reciprocating motion characteristics are inconsistent. In order to solve this problem, proposed direct-drive differential volume control electro-hydraulic servo system design of its control system and analysis of system models. Through theoretical analysis, validate this proposed direct-drive bad dynamic volume control system, symmetric dynamic performance, improving control system reliability.
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Kurochkin, Anton, Vladimir Vagin, Anton Karpesh, and Natalja Dyorina. "Control system for electrohydraulic drive of a mobile sinking hoisting plant." MATEC Web of Conferences 224 (2018): 02009. http://dx.doi.org/10.1051/matecconf/201822402009.
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The article presents the results of the control system development for the electro hydraulic drive of a mobile sinking hoisting plant. Increasing the technical performance of mobile sinking hoisting plants is possible by increasing their productivity, reducing their massiveness and increasing the durability of tractional organs and a number of units and parts of lifting machines. However, the increase in productivity, in its turn, causes the need to increase the suspended load on the traction organs, which causes a significant increase of the dynamic loads in the elastic elements in the transient operation modes of the hoisting plant. One of the ways to reduce constantly acting dynamic loads of vibration character is the use of a gearless hydraulic drive with damping properties. But, nevertheless, the hydraulic drive possibilities are limited for large vibration amplitudes of dynamic forces. The damping properties of the hydraulic drive can be increased by using control system, which allows realizing effective control of the electro hydraulic drive of the hoisting plant.
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Karamguzhinova, A. E., V. N. Kuznetsova, V. V. Savinkin, and D. A. Koptyaev. "ELECTROHYDROCYLINDER OF INCREASED EFFICIENCY: PROSPECTS FOR THE DEVELOPMENT OF MECHATRONIC SYSTEMS." Russian Automobile and Highway Industry Journal 17, no. 1 (March 5, 2020): 22–31. http://dx.doi.org/10.26518/2071-7296-2020-17-1-22-31.
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Introduction. The problem of increasing the efficiency of power machines is important to develop a new design of the main elements or drive with the possibility of widespread use of hybrid drives. To preserve the power characteristics of the drive and its technical and operational indicators, the authors consider a hybrid with the available electric and hydraulic drive parts that form a complex synergistic mechanism as an alternative. The proposed combined tracking system with the specified parameters allows for the efficient operation of the drive of many machines.Materials and methods. The paper presented the results of an analytical study, the prospects for the development of mechatronic systems in engineering and technological complexes. The research also identified the industry area with a high development potential for mechatronic and hybrid drives. The authors formulated the problem of designing and developing hybrid drives due to the fact that there was no single method for substantiating the energy efficiency indicators of a power hybrid drive that ensured the interaction of two dissimilar systems (electric drive and hydraulic drive with fundamentally different parameters).Results. Therefore, the authors conducted the analysis of the structural, technological and operational parameters of the hybrid drive systems and proposed a combined servo drive system.Discussion and conclusions. The authors prove and justify the extensive possibilities of using hybrid drives as an alternative to pneumatic and hydraulic drives The results of the research allow specifying the directions and prospects of using hybrid synergetic drives and systems for the functioning of working equipment, machines and complexes.Financial transparency: the authors have no financial interest in the presented materials or methods. There is no conflict of interest.
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Kobayashi, Wataru, Hiroaki Tamaki, Tetsuya Akagi, Shujiro Dohta, and So Shimooka. "Development of Flexible Electro-Hydraulic Spherical Actuator." Journal of Robotics and Mechatronics 34, no. 2 (April 20, 2022): 382–89. http://dx.doi.org/10.20965/jrm.2022.p0382.
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Voluntary rehabilitation at home helps to prevent the joint contracture after medical treatment. Our previous studies concerned a low-cost portable rehabilitation device using a flexible spherical pneumatic actuator as a passive exercise device. However, the device requires a bulky compressor to drive it. This study results in a compact fluidic driving system that is highly flexible. The system adopts a flexible electro-hydraulic cylinder driven by an electric motor and a hydraulic gear pump. An empirical equation for the suitable pump rotation for the desired displacement of the system has been determined. As a result, the multi-position control of the system within the tracking error of 4 mm has been realized by using the on/off control scheme based on the obtained equation. In addition, a flexible, spherical electro-hydraulic actuator using two proposed drive systems is developed and tested. Control of the attitude of the tested spherical actuator is successfully realized.
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Gu, Lichen, and Yuan Shi. "Online Monitoring Technique of Power Condition for Inverter-Fed Motor Driven Hydraulic System." Mathematical Problems in Engineering 2019 (May 5, 2019): 1–16. http://dx.doi.org/10.1155/2019/4908942.
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As a new type of global energy-saving transmission mode, frequency conversion hydraulic drive system has been widely used. Since hydraulic systems become more complex and transfer more power, operating accidents often occur unexpectedly. Therefore, online monitoring of the running state of the hydraulic system is significant during its long-term operation. The pressure, flow, and vibration signals obtained by traditional monitoring methods are nonstationary and susceptible to disturbance. In order to solve this problem, a method of monitoring power condition of the motor driven hydraulic system based on input voltage and current of the motor is proposed. The present study uses the amplitude and phase information of the voltage and current signals on the stator side of the AC motor to form a dynamic power circle graph and extracts feature information from the graph to monitor the power state and its dynamic change process of the hydraulic system. Results obtained from experiments conducted under different frequencies and loads indicate that the proposed method can realize the online monitoring successfully and effectively. Furthermore, the method has another advantage of monitoring the dynamic power change process of the hydraulic drive system and the power matching process between the motor and the system load condition in a visualized way.
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Wang, Hong. "Hydraulic System Design for Hexagon Workpiece Flipping Equipment." Advanced Materials Research 228-229 (April 2011): 719–22. http://dx.doi.org/10.4028/www.scientific.net/amr.228-229.719.
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Workpiece flipping equipment is widely used in hexagon workpiece multi face and work station processing. Hydraulic drive has advantages of easy linear motion achivement, high power quality ratio and rapid dynamic response, etc. It is an essential element of modern mechanical engineering and one of the key technologies of engineering controls. Hydraulic drive system of the hexagon workpiece flipping equipment was designed, the hydraulic system schematic was drawn, its working principle was analysed. The workpiece flipping was successfully achieved by using hydraulic technology, it obtained good results in practical applications.
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Han, Lei, Hong Jie Wang, De You Li, and Yang Yao. "MRAC for Direct Drive Electronic-Hydraulic Servo System." Advanced Materials Research 433-440 (January 2012): 4142–48. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.4142.
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In order to improve the accuracy, stability and rapidity of response, the paper built the mathematic model, and designed the high order system following the low order model based on Popov Hyperstable theory. Then applied this control method and PID method in actual system, compared them in time domain response. The result approves that the system owns better rapid and stable characteristics, satisfying the requirement when the direct drive electronic-hydraulic position control system changes its conditions. Further, improves that the theory is correct, certificates that the MRAC is very adaptive to the direct drive electronic-hydraulic servo system.
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Mickoski, Hristijan, and Marjan Djidrov. "Modeling of mechanism with linear hydraulic drive system." Mathematical Models in Engineering 5, no. 3 (September 30, 2019): 73–78. http://dx.doi.org/10.21595/mme.2019.20873.
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Linjama, Matti. "Variable speed digital hydraulic transformer–based servo drive." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 234, no. 3 (August 12, 2019): 287–98. http://dx.doi.org/10.1177/0959651819869145.
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This article studies a digital hydraulic servo drive driven by a variable speed electric servomotor. Digital displacement control is implemented by using a two-port digital hydraulic power management system having six pistons and 18 on/off control valves. The first port of the digital hydraulic power management system controls the cylinder speed, while the second port is connected to a hydraulic accumulator. The peak power is taken from the accumulator, and the electric servomotor supplies only the average power into the system. An experimentally validated simulation model is used, and the results show a combination of adequate controllability and excellent energy efficiency. The estimated reduction in the size of the electric motor is 57%.
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Zhu, Chenhui, Hongmei Zhang, Wanzhang Wang, Kang Li, and Wanru Liu. "Robust control of hydraulic tracked vehicle drive system based on quantitative feedback theory." International Journal of Distributed Sensor Networks 16, no. 2 (February 2020): 155014772090783. http://dx.doi.org/10.1177/1550147720907832.
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To improve the control precision of the drive system of hydraulic tracked vehicles, we established a mathematical model of the drive system based on the analysis of structural characteristics of the high-clearance hydraulic tracked vehicles and the dual-pump dual-motor drive system and developed a control strategy based on the quantitative feedback theory. First, the mutual independence of the two motor channels was achieved through channel decoupling. Then, the loop-shaping controller and the pre-filter were designed for the two channels. The result of a simulation experiment indicates that the proposed control method is very effective in suppressing external uncertainties and smoothening the speed-switching process of the hydraulic motor. Finally, an hydraulic tracked vehicle steering experimental test was carried out. The results show that under two different steering modes, the maximum standard deviation of the output speeds of the inner and outer motors of the hydraulic tracked vehicle is only 0.42, which meets the performance requirement on the hydraulic motor speed. The average steering track radii of the geometric centers of the inner and outer tracks are 1.828 and 0.033 m, respectively, and the relative errors are 1.56% and 3.19%, respectively. This demonstrates that the proposed control method achieves satisfactory results in the robust control of the hydraulic tracked vehicle drive system. It provides some references for the future control research of the hydraulic servo drive system of the high-clearance hydraulic tracked vehicles.
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Nanjo, Takao, and Etsujiro Imanishi. "56395 DYNAMIC SIMULATION OF FLEXIBLE MULTIBODY SYSTEM WITH ELECTRIC-HYDRAULIC DRIVE SYSTEM(Modeling, Formalisms, and DAE Solution Method)." Proceedings of the Asian Conference on Multibody Dynamics 2010.5 (2010): _56395–1_—_56395–8_. http://dx.doi.org/10.1299/jsmeacmd.2010.5._56395-1_.
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Dong, Yan Liang, and Zhan Song Qian. "A Research on Dual Hydraulic Motor Synchronizing Driving System with Pressure Coupling." Applied Mechanics and Materials 779 (July 2015): 175–81. http://dx.doi.org/10.4028/www.scientific.net/amm.779.175.
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This paper introduces a new concept about pressure coupling in dual hydraulic motor synchronizing driving system. The mathematic models of systems are established in together-drive mode where two hydraulic motors together drive one common load and peer-to-peer mode where two motors drive one load respectively. Based on these mathematic models, a simulation analysis is conducted to probe the influence exerted by pressure coupling on the frequency response and the model consistency of two hydraulic motors, which gets verified by simulations and experiments later. The results show that pressure coupling reconstructing mathematic models of systems improves the model consistency of two motors and ameliorates synchronization performances.
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Trukhanov, K. A. "Transients in hydraulic drive of a fan for engine cooling system of a vehicle." Izvestiya MGTU MAMI 7, no. 1-1 (January 10, 2013): 195–204. http://dx.doi.org/10.17816/2074-0530-68326.
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The article describes the mathematical model and the calculation of the transients in designed hydraulic drive of a vehicle cooling system. There is presented the verification of the mathematical model using results of test of hydraulic drive specially built for designed system. The author carried out the comparison of the calculated pressure transients with other ones obtained during the test of prototype of hydraulic drive for cooling of vehicle engine.
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Zhang, Zeng Meng, Yong Jun Gong, and Jiao Yi Hou. "Drive Characteristic Analysis and Test System Design for Water Hydraulic Artificial Muscle." Applied Mechanics and Materials 511-512 (February 2014): 737–42. http://dx.doi.org/10.4028/www.scientific.net/amm.511-512.737.
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Performance tests and drive experiments play an important role in researches on water hydraulic artificial muscles. A test system is designed to analyze the drive characteristic of the developed water hydraulic artificial muscle. Through simulation getting main parameters, the hydraulic circuit to regulate the pressure of the water hydraulic artificial muscle and a proportional control loading system are built. The pressure control and drawing force regulation in the loading system for muscles with different diameter and length are provided by the designed test system. The experimental results show that the muscle pressure can be adjusted stably and the contraction of the tested muscle can be measured under different preset drawing forces. The test system for the water hydraulic artificial muscle is useful in the researches on drive characteristic and control system of the water hydraulic artificial muscle.
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Qu, Jin Yu, Yi Rui Zhang, Gui Xian Qu, and Lin Liu. "Design of Automatic Clutch System and Simulation of Engagement Process for AMT." Applied Mechanics and Materials 69 (July 2011): 67–72. http://dx.doi.org/10.4028/www.scientific.net/amm.69.67.
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In this paper the executive mechanism and electric-hydraulic control system for AMT automatic clutch were designed. A hydraulic cylinder was applied as the actuator. The hydraulic source with constant pressure using electric oil pump was designed. The basic idea lies in using pulse signal with variable duty cycle to drive high-speed solenoid valves in the process of regulating hydraulic circuits. Hydraulic oil drives the cylinder to realize the control of dry clutch. At last, the actuator was modeled and simulated based on AMESIM. From the analysis of the simulation results, the system mentioned in this paper can meet the performance requirements of AMT equipped with automatic clutch.
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Dumitrescu, Liliana, Polifron Alexandru Chiriţă, Corneliu Cristescu, Ioan Lepădatu, and Evelin Laza. "Theoretical analysis of the dynamics of a nacelle drive system in order to optimize the system energy." E3S Web of Conferences 112 (2019): 04003. http://dx.doi.org/10.1051/e3sconf/201911204003.
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The paper presents the hydraulic system for the operation of a lifting platform in two constructive variants. One of the drive schemes is with energy recovery. A hydraulic, energy and economic analysis is performed for the two proposed drive schemes using the numerical simulation technique. The conclusions are useful in design and exploitation. The platform can be used for various applications in agricultural farms or construction.
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Long, Ze Ming, Bao Jun Zhang, and Shi Qing Guo. "Control Strategy for Hydraulic Hybrid Servo Drive System of Heavy Load Robot." Materials Science Forum 800-801 (July 2014): 521–25. http://dx.doi.org/10.4028/www.scientific.net/msf.800-801.521.
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A kind of compound servo drive system is designed using the characteristics of hydraulic motor large torque and servo motor high accuracy positioning. Proportional pressure valve, proportional flow valve and electromagnetic directional valve was used to control hydraulic motor for tracking servo motor drive control and to achieve servo motor control for weight load of large torque and high accuracy positioning. Pressure, speed control strategy of using PID control is proposed based on the above hydraulic tracking drive system, achieve precise control for trajectory of robot articulated arm under heavy load conditions. And according to the requirements of the pressure, flow rate and reversing in the process of compound servo drive, a torque, speed and direction of the switching control strategy is put forward. Mathematical model is established and simulated based on tracking control system. The experiments indicate: under heavy load conditions, response speed, torque and angle control accuracy of hydraulic hybrid drive system meet the requirements with this control method and torque, speed switching control strategy.
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Shargorodskiy, Serhiy, and Volodymyr Rutkevych. "INFLUENCE OF PHYSICAL AND MECHANICAL PROPERTIES OF STEM FEED AND DESIGN OF THE WORKING BODY ON THE DRIVE POWER OF THE CUTTING MECHANISM." ENGINEERING, ENERGY, TRANSPORT AIC, no. 2(113) (June 29, 2021): 38–49. http://dx.doi.org/10.37128/2520-6168-2021-2-5.
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The paper considers the problem of reducing the drive power of the mechanism for separating stalk feed from trench storages by the batch method by developing and substantiating the parameters and operating modes of the hydraulic drive system. The structure and principle of construction of a system of hydraulic drives of the mechanism for separating a portion of stem feed are proposed. This will significantly reduce the power of the used hydraulic motors by simultaneously controlling the cutting speed of the monolith of stem feed and the feed of the cutting device. The analysis of changes in the physical and mechanical properties of stalk forage (silage and haylage), depending on the height of occurrence in the trench storage, has been carried out. The process of separation of the stalk feed from the feed monolith is considered. The complexity of the technological process of separating the portion of the stalk feed from the feed monolith due to the change in the physical and mechanical properties of the feed from the height in the trench storage and the lack of adaptation of the loader drive to such differences is indicated. A basic hydraulic diagram of the loader drives is proposed, which is based on the dependence of the cutting force of the material on the parameters of cutting modes. The theoretical foundations of the calculation were formulated by I. Timme and later adapted to the peculiarities of the work of agricultural machinery by V.P. Garyachkin. This theory allows you to determine the cutting force on the working body of the cutter bar depending on the cutting speed, feed of the cutter bar and depth of cut. An adaptive hydraulic drive of the mechanism for separating the stalk feed is proposed, which makes it possible to coordinate the operation of the cutter bar drive with its supply. The possibility of reducing the drive power of the mechanism for separating the stalk feed to 5-6 kW when using a system of hydraulic drives with a mechanism for adapting the working bodies to their working conditions has been confirmed. The modes of operation and the possibilities of increasing energy efficiency, competitiveness of technological machines and aggregates of the agro-industrial complex, by developing and substantiating the parameters of the hydraulic drive system, are indicated.
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Yang, Ming Jin, Xi Wen Li, Zhi Gang Wang, and Tie Lin Shi. "Modeling and Simulation of the Speed Regulating System of a Planetary Mixer." Advanced Materials Research 422 (December 2011): 113–16. http://dx.doi.org/10.4028/www.scientific.net/amr.422.113.
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Hydraulic drive mixers are widely employed to process the cohesive mixture, especially the energetic mixture. According to the mathematic models of main links of the speed regulating system of a hydraulic drive planetary mixer, a simulation model for the system was presented in this paper. The load and impulsion have impacts on the speed response of the speed regulating system with good performance of stability. The converted rotary inertia of the hydraulic motor has a two-sided impact on the speed regulating system, namely impact the response and the overshoot performance at the same time. And, the leakage of the hydraulic drive system often has a bad impact on the speed response of the regulating system.
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Yang, Yong, and Qian Lin Chen. "Modeling and Analysis of Full Hydraulic Pressure Drive System of the Wheel Loader Based on AMEsim." Applied Mechanics and Materials 397-400 (September 2013): 261–65. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.261.
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The characteristics of traditional load sensitive system and the control system of electric hydraulic flow matching are introduced comparatively. In order to improve the energy saving and the overall control performance of wheel loader, Electro-hydraulic flow matching control system is adopted. In the meantime, the machine-liquid walking institution in the traditional sense is changed into full hydraulic pressure drive institution by using the module modeling way, which omits the "double" system including the hydraulic torque converter and the transmission constitute, simplifies the chassis structure and improves the flexibility of the machine. Simulation model of the wheel loader of full hydraulic pressure drive is established by the software named AMEsim, which provides reference for the designs and applications of the matching control system of electric hydraulic flow applied to the full hydraulic pressure drive wheel loader.
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Trukhanov, K. A. "MATHEMATICAL MODELING OF HYDRAULIC DRIVE OF A FAN FOR AUTOMOTIVE ENGINE COOLING SYSTEM." Izvestiya MGTU MAMI 6, no. 1 (January 10, 2012): 84–95. http://dx.doi.org/10.17816/2074-0530-69909.
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The article presents a mathematical model of hydraulic drive of a fan for cooling automobile engine, equations, block diagrams of elements of the hydraulic system. As the flow model to describe the heat transfer process the model of ideal mixing is adopted. The authors got the mathematical model of the hydraulic drive and the corresponding transients.
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Wang, Haifei, Shimin Yang, and Tan Lu. "Mechanical transmission system of loader based on hydraulic hybrid technology." Thermal Science 25, no. 6 Part A (2021): 4233–40. http://dx.doi.org/10.2298/tsci2106233w.
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In order to solve the problems of high energy consumption, high noise and pollution gas emission existing in the mechanical transmission system of loader, a research on the mechanical transmission system of loader based on hydraulic hybrid technology is proposed. The mechanical energy and heat energy are generated by the mechanical operation of the loader, which are converted into hydraulic energy and output to the drive system. According to the fast response characteristics and high power density characteristics of the hydraulic power system relative to the thermal engine, the dynamic model of the hydraulic hybrid drive system of the loader is established. The double fuzzy PID control method is used to identify and modify the unknown load and power parameters of the drive system. Through the experiment, it is concluded that the power parameter matching of the transmission system using the hydraulic hybrid technology is more optimized, the application effect is good, and the efficiency of the power transmission system can be maximized.
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Власов, Е. Н., А. В. Сергеевичев, Ю. А. Добрынин, and В. В. Сергеевичев. "The analysis of the work of a hydraulic manipulator of a forest machine with a cyclic control system." Известия СПбЛТА, no. 238 (March 11, 2022): 99–112. http://dx.doi.org/10.21266/2079-4304.2022.238.99-112.
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Лесозаготовка – одна из самых динамичных отраслей хозяйствования в нашей стране. На данный момент способы заготовки древесины претерпели существенные изменения. Вместо ручного труда используются различные приспособления и устройства, в число которых входят и гидроманипуляторы для леса. Оборудование манипуляторного типа (гидроманипулятор) представляет собой механизм, который устанавливается на автомобили, тракторы, специализированный транспорт, а также стационарно. Эффективность использования машин и оборудования находится в прямой зависимости от их технического состояния, готовности надежно, качественно и безопасно осуществлять процессы лесозаготовительного производства. Состояние машин и оборудования зависит не только от их технического уровня и соблюдения правил эксплуатации, но и от качества их проектирования. Динамические исследования объемных гидроприводов лесных машин занимают важное место в процессе их проектирования. В инженерной практике на стадии как предварительного анализа динамических характеристик объемных гидроприводов, так и эскизного проектирования, широкое применение нашли их линеаризованные математические модели. Рассмотрены линеаризованные модели: циклового гидропривода с дроссельным управлением, исполнительного устройства следящего гидропривода манипулятора лесной машины, гидравлического следящего привода с механическим управлением. Приводятся результаты исследования устойчивости следящего гидропривода с механическим управлением. Выведено выражение, определяющее устойчивость гидравлического следящего привода с механическим управлением, включающее коэффициент скольжения обобщенной гидравлической характеристики золотника и коэффициент усиления по расходу, позволяющее находить их значения, соответствующие устойчивому состоянию гидропривода с механическим управлением. Полученные результаты могут быть использованы в процессе проектирования гидроманипуляторов лесных машин как на этапе предварительного проектирования, так и на этапе технического проектирования и получения амплитудно-фазовых частотных характеристик гидропривода лесных машин. Logging is one of the most dynamic economic sectors in our country. At the moment, the methods of timber harvesting have undergone significant changes. Instead of manual labor, various devices and devices are used, including hydraulic manipulators for the forest. The manipulator-type equipment (hydraulic manipulator) is a mechanism that is installed on cars, tractors, specialized vehicles, as well as stationary. The efficiency of using machines and equipment is directly dependent on their technical condition, readiness to reliably, efficiently and safely carry out the processes of logging production. The condition of machines and equipment depends not only on their technical level and compliance with operating rules, but also on the quality of their design. Dynamic research of volumetric hydraulic drives of forest machines occupies an important place in the process of their design. In engineering practice, at the stage of both preliminary analysis of the dynamic characteristics of volumetric hydraulic drives, and at the stage of preliminary design, their linearized mathematical models are widely used. The article considers linearized models: a cyclic hydraulic drive with throttle control, an actuator for a hydraulic servo drive of a forest machine manipulator, a hydraulic servo drive with mechanical control. The results of a study of the stability of a servo hydraulic drive with mechanical control are presented. An expression is derived that determines the stability of a hydraulic servo drive with mechanical control, including the slip coefficient of the generalized hydraulic characteristics of the spool and the flow rate gain, which makes it possible to find their values corresponding to the steady state of a hydraulic drive with mechanical control. The results obtained can be used in the process of designing hydraulic manipulators of forest machines, both at the stage of preliminary design and at the stage of technical design and obtaining the amplitude-phase frequency characteristics of the hydraulic drive of forest machines.
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Woś, Piotr, and Ryszard Dindorf. "Modeling and Identification of the Hydraulic Servo Drive." EPJ Web of Conferences 213 (2019): 02100. http://dx.doi.org/10.1051/epjconf/201921302100.
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This paper discusses possibilities to apply the dynamic identification with a discrete linear model while assessing the state of the electro-hydraulic drive dynamics. This evaluation is crucial while designing modern power or positional control systems. Experimental data is applied in order to determine the model dynamics of the real system and estimate unknown parameters of an object model. The dependencies were interpreted. The paper includes the selected results of current identification tests of the electro-hydraulic drive system as a result of which the discrete parametric object model was derived.
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Жукевич, А. Б., and О. А. Жукевич. "СИНТЕЗ І НАПІВНАТУРНЕ МОДЕЛЮВАННЯ СИСТЕМИ УПРАВЛІННЯ ГІДРОПРИВОДУ З КОВЗНИМИ РЕЖИМАМИ." Open Information and Computer Integrated Technologies, no. 87 (June 30, 2020): 121–36. http://dx.doi.org/10.32620/oikit.2020.87.06.
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We consider the construction of servo-hydraulic drive of volumetric regulation system control relay type. A volumetric hydraulic actuator is used in agriculture, construction, transport machine, coal harvesters, rigs, airplanes, military machinery, etc. Hydraulic bulk drive have several advantages, most important of which are the possibility of obtaining a great effort, smooth operation, low inertia hydraulic machines, relatively high efficiency (up to 80%), high reliability. At the same time, he has a number of drawbacks, chief of which is the change in the properties of the working liquid during operation and under the influence of external factors. The disadvantages include loss of hydraulic oil, contamination of the liquid during operation. These shortcomings can lead to loss of quality control loss of accuracy, speed of working off of the set of control actions. One of the classes of systems which structurally provide high dynamic accuracy, there are systems operating in the sliding mode. In addition, due to the introduction of sliding mode in some cases it is possible to increase the degree of astaticism of the system, and hence to improve the playback quality of the input job. Proposed the implementation of a control system of hydraulic drive, is invariant to parametric and external disturbances through the use of sliding modes. To study the proposed control system with hydraulic drive constructed model of the developed system, which is the natural object of a hydraulic drive using its mathematical model, at the same time the control system is implemented physically is one that can be used in a real device. Hill simulation has allowed answering the questions of realization of sliding modes when controlling hydraulic drive of volumetric regulation through a DC motor. The behavior of a control system of hydraulic drive when changing the parameters of the control object (the moment of inertia, viscosity), which showed that the change of damping ratio within a wide range (up to 50% of the design) does not disrupt the sliding mode, the quality of the regulatory process does not deteriorate significantly. At the same time, the change to 100% conversion rate can lead to instability of the control system that allows to make a conclusion about the establishment of the position controller on the lesser of the possible damping coefficients. Also a study of digital implementation of the synthesized control law by introducing in the control loop time delay has been carried out, which is possible with the use of microprocessor-based calculator.
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Tan Pe Hao, Muhammad Iftishah Ramdan, Khairul Anuar Idris, Muhammad Syafiq Abdul Rashid, Muhamad Haziq Haris Patilah, Mohd Azmi Ismail, and Inzarul Faisham Abdul Rahim. "Performance on Regenerative Braking System on a Through-The-Road Hydraulic Hybrid Vehicle." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 91, no. 2 (February 11, 2022): 62–71. http://dx.doi.org/10.37934/arfmts.91.2.6271.
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Hydraulic Hybrid Vehicle (HHV) has a great potential to be an efficient drive train for passenger vehicle, yet most of the HHV drive train studies are focused on heavy-duty vehicles. In order to apply the HHV drive train in passenger vehicles, the performance of the regenerative braking system of the through-the-road (TTR) parallel architecture HHV needs to be tested. The performance of the HHV drive train is captured by the overall efficiency of the hydraulic pump and the mechanical efficiency of the hydraulic motor. This paper obtains the efficiencies of the hydraulic pump and motor by building a test rig to measure their torque using load cells. The highest overall efficiency of the pump is 82% and the highest mechanical efficiency of the motor is 74 %. Both highest efficiencies are achieved when the regenerative braking system operates at pressure of 75 bar.
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Akshay, Naregalkar. "Multi-Vendor Remote Monitoring and Control System for Hydraulic Drive Systems." CVR Journal of Science & Technology 03, no. 1 (December 1, 2012): 56–61. http://dx.doi.org/10.32377/cvrjst0312.
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