Статті в журналах: "Hydraulic volume mechanical transmission"

1

Han, Ying. "Study on Hydraulic System for Full Hybrid Transmission." Applied Mechanics and Materials 607 (July 2014): 495–99. http://dx.doi.org/10.4028/www.scientific.net/amm.607.495.

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Design method of hydraulic system of full hybrid transmission was analyzed. At first, oil volume flow and pressure requirement was confirmed according to the vehicle control strategy. Mechanical gear pump and electric pump were used to supply oil flow for all driving modes. Self-adapted pressure regulation circuit was designed to supply high pressure oil for brake engagement. Structure dimension of valves and cooling orifices was designed by theoretical calculation. Cooling flow can be distributed proportionally among electric motors and planetary gears.

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2

Karmel, A. M. "Design and Analysis of a Transmission Hydraulic System for an Engine-Flywheel Hybrid-Vehicle." Journal of Dynamic Systems, Measurement, and Control 112, no. 2 (June 1, 1990): 253–60. http://dx.doi.org/10.1115/1.2896133.

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Unlike hydraulic systems of conventional automotive transmissions, the hydraulic system of a hybrid vehicle must cope with large variations of pressure as well as flow. If supplied by traditional pump configurations, either fixed or variable displacement, the system will incur substantial efficiency losses. This paper presents a feasibility study of a dual-pump hydraulic supply system which consists of a low-volume fixed-displacement pump and a high-volume variable-displacement pump. The analysis addresses the dynamic characteristics of this system along with its sensitive design areas.

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3

Song, Jin Chun, Guan Gan Ren, and Lin Yang. "Design and Simulation of an Energy-Saving Hydraulic Oil Production System." Advanced Materials Research 619 (December 2012): 498–502. http://dx.doi.org/10.4028/www.scientific.net/amr.619.498.

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The study on an advanced equipment of a new pumping unit is presented to satisfy the mining technology demands of large load, long stroke and low pumping speed during petroleum exploitation process. The method of using a full hydraulic system drive rather than the traditional way is adopted to overcome the disadvantages in a traditional oil production equipment such as complex mechanical structure, large volume,many transmissions, low efficiency and high manufacturing cost. In addition, the hydraulic circuit which is made up of an accumulator, a hydraulic motor and two hydraulic pumps is used to realize power recovery for energy saving. The mechanical mathematical model and the hydraulic one of a novel hydraulic oil production mechanism were established and analyzed. Good results are eventually obtained. This equipment has been the national patent.

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4

Yang, Mingkun, Gexin Chen, Jianxin Lu, Cong Yu, Guishan Yan, Chao Ai, and Yanwen Li. "Research on Energy Transmission Mechanism of the Electro-Hydraulic Servo Pump Control System." Energies 14, no. 16 (August 10, 2021): 4869. http://dx.doi.org/10.3390/en14164869.

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The electro-hydraulic servo pump control system (EHSPCS) is a volume control system that uses a permanent magnet synchronous motor (PMSM) with a fixed displacement pump to directly drive and control the hydraulic cylinder. The energy transmission law of the system is very complicated due to the transformation of electrical, mechanical and hydraulic energy as well as other energy fields, and qualitative analysis of the energy transfer efficiency is difficult. Energy transfer analysis of the EHSPCS under different working conditions and loads is proposed in this paper. First, the energy flow transfer mechanism was analyzed, and the mathematical and energy transfer models of the key components of the system were established to explore the energy characteristic state transition rule. Second, a power bond diagram model was built, its state equation and state matrix were deduced, and a system simulation model was built. Finally, combined with the EHSPCS experimental platform, simulation experiments were carried out on the dynamic position following and steady-state position holding conditions of the system, and the variation rules of the power of each energy characteristic state and the system energy transfer efficiency under different loads were obtained. The research results provide a foundation for the study of power matching and energy-saving mechanism of the EHSPCS.

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5

Lou, Xi Yin. "Study on Walking System Technology of Crawler Combine Harvester." Advanced Materials Research 1037 (October 2014): 107–10. http://dx.doi.org/10.4028/www.scientific.net/amr.1037.107.

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Crawler combine harvester walking system is various transmission technology are organic and reasonable matching, foster strengths and circumvent weaknesses, complementary drive system so as to achieve the best overall. Stepless speed walking is particularly suitable for complex condition changes, the demand of drive system for a more comprehensive, more comprehensive, objective stepless speed walking in transmission system innovation or seek better performance, and as a mechanical transmission device of the planetary gear has the advantages of small volume transfer large torque, high efficiency. The combination of both realizes stepless transmission, and has the advantages of low speed and high torque. Hydraulic drive system is mainly to achieve stepless speed regulation, commutation, planetary gear drive mainly reduce speed, increase the torque to. Composite transmission mode that can greatly improve the transmission ability, expand the scope of speed adjustment. In fact, combine the stepless variable speed running and control technology can greatly improve the performance of the product, especially the effect on production efficiency, durability, controllability, environment adaptability, green characteristics were significantly.

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6

Bagarello, Vincenzo, Gaetano Caltabellotta, and Massimo Iovino. "Water transmission properties of a sandy-loam soil estimated with Beerkan runs differing by the infiltration time criterion." Journal of Hydrology and Hydromechanics 69, no. 2 (May 21, 2021): 151–60. http://dx.doi.org/10.2478/johh-2021-0010.

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Abstract The Beerkan method consists of a ponded infiltration experiment from a single ring inserted a small depth into the soil. Fixed, small volumes of water are repeatedly poured into the ring to maintain a quasi-zero head on the soil surface. According to the standard Beerkan infiltration run, a new water volume is poured on the infiltration surface when the previously applied volume has completely infiltrated and the soil surface is entirely exposed to air (ta criterion). However, water could also be applied when the soil exposition to air begins (to criterion) or half the soil surface is exposed to air (tm criterion). The effect of the infiltration time criterion on determination of the water transmission properties of a sandy-loam soil was tested. As compared with the standard ta criterion, the two alternative criteria (to , tm ) yielded higher and/or more variable estimates of soil water transmission properties. The saturated soil hydraulic conductivity, Ks , was the most sensitive property to the infiltration time criterion. However, statistically significant differences for Ks were not practically substantial since they did not exceed a factor of 1.7. Infiltration time effects likely occurred due to differences between ponding depth of water, soil water pressure head gradient, air entrapment and soil mechanical disturbance. The standard ta criterion was suggested for performing a Beerkan experiment in the field since it appears to yield the most reliable estimates of a mean value. However, the to criterion could be considered in dual permeability soils to maintain macropores active. Factors that could appear minor in the context of an experiment can have statistically relevant effects on water transmission properties.

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7

Jen, Y. M., and C. B. Lee. "Influence of an Accumulator on the Performance of a Hydrostatic Drive with Control of the Secondary Unit." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 207, no. 3 (August 1993): 173–84. http://dx.doi.org/10.1243/pime_proc_1993_207_336_02.

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In a secondary control unit system, an accumulator changes the relationship of the pumps and motor from flow coupling to pressure coupling. This change creates several benefits, including energy conservation, increased stability and the ability to change the rotational direction of the hydraulic motor. The accumulator therefore plays an important role because it dominates the overall performance of the secondary control unit system. This paper studies the influence of accumulator volume and precharge gas pressure on the performance of a hydrostatic transmission system in a secondary unit control system. A small test rig of the secondary unit system was set up and a series of experimental studies were run. A mathematical model was derived for simulation purposes. The results reveal that making the volume of the accumulator and the precharge gas pressure as high as possible under permitted circumstances can decrease the fluctuation of working pressure, improve the dynamic performance of speed control and increase the recovery of energy.

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8

Guo, Meng, Cheng Liu, Qingdong Yan, Wei Wei, and Boo Cheong Khoo. "The Effect of Rotating Speeds on the Cavitation Characteristics in Hydraulic Torque Converter." Machines 10, no. 2 (January 23, 2022): 80. http://dx.doi.org/10.3390/machines10020080.

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Hydraulic torque converter is a kind of high speed rotating machine using viscosity hydraulic oil as working medium, and its internal flow field is very complex. Thereby cavitation can occur easily in the working process, resulting in severe degradation of torque converter performance, noise, vibration and even failure. In order to reveal the effect of rotating speeds on the cavitation characteristics, a full flow passage geometry and a computational fluid dynamics (CFD) model with cavitation were developed to analyze the flow behavior in the torque converter. The results show that cavitation occurs when the speed difference between pump and turbine exceeds 1400 rpm for the basic model torque converter, which could be used as a useful indicator for the occurrence and degree of severity of flow cavitation. The increase of pump rotating speed or the decrease of speed ratio will intensify cavitation, which reduces the hydraulic transmission capacity and efficiency by over 20%, and seriously alters the shape, size, vapor volume fraction and region of cavitation bubbles. In extreme cases, more than 80% of the area on the suction side of the stator blade could be covered by cavitation bubbles. Moreover, the increase of pump rotating speed also changes the critical cavitation number and extends the cavitation range towards high speed ratio conditions not previously affected. These findings can provide guidance on how to choose the operating conditions of the hydraulic torque converter and how to improve its hydrodynamic performance and stability.

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9

Liu, Hua, Ghaith Arfaoui, Milos Stanic, Laurent Montigny, Thomas Jurkschat, Thomas Lohner, and Karsten Stahl. "Numerical modelling of oil distribution and churning gear power losses of gearboxes by smoothed particle hydrodynamics." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 1 (February 23, 2018): 74–86. http://dx.doi.org/10.1177/1350650118760626.

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Sufficient oil supply of all machine elements in gearboxes is usually required to avoid damage during operation. Quite frequently, transmissions are conservatively designed with an oversupply of oil to guarantee operational reliability. An oversupply of oil results in an unnecessarily high amount of oil being kept in motion, which in turn leads to excessive hydraulic gear power losses. In high-speed gearboxes in particular, churning losses can contribute greatly to the total power losses. Further detailed information on the oil distribution in gearboxes is needed in order to increase the efficiency and operational reliability of gearboxes. Computational Fluid Dynamics methods provide a flexible way of investigating oil behaviour in transmissions with almost no restrictions regarding geometry and operating conditions. Generally, there are two main methods of computational fluid dynamics simulation in gearboxes: the traditional finite-volume based method (Eulerian approach) and the mesh-free particle-based method (Lagrangian approach). In this work, a computational fluid dynamics model based on the particle-based smoothed particle hydrodynamics method is built to investigate the oil distribution and churning losses of a dip-lubricated single stage gearbox on an efficiency gear test rig. Results are shown and discussed for different rotational speeds and oil temperatures. The smoothed particle hydrodynamics method provides a high potential of predicting the oil distribution of modern dip-lubricated transmission systems. Comparisons with high-speed camera recordings show good agreement. However, the method shows a need for improvement in churning loss prediction.

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10

Huang, Chung Neng, Kuo Han Chen, and David T. W. Lin. "Development of an Novel Adaptive Suspension System Based on Ball-Screw Mechanism." Applied Mechanics and Materials 477-478 (December 2013): 128–31. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.128.

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For the passive and semi-active suspensions are characterized as with constant parameters which cannot cope with time-variant road conditions, the suspension results are difficult to be satisfied. Although, the active ones are better than previous two on suspension performance, until now which are still far from real application for the drawbacks of complicated structure, large volume, costly, and difficult maintenance. Here, Ball Screw (BS) is with the characteristics of smaller volume, precise positioning, and well handling high-speed forward and backward transmissions. Instead of hydraulic or pneumatic mechanisms used for vehicle suspension, BS is adopted to be the main body of the proposed New Adaptive Suspension System (NASS). Besides, in order to overcome the unavoidable time-delay resulted from mechanical or computational operations, the Kalman filter, integrated with suspension controller, is used to estimate the road conditions. The effectiveness and feasibility of this proposal are confirmed through simulation studies.

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11

Liu, Hongtuo, Fangwei Xie, Kai Zhang, Xinxing Zhang, Jin Zhang, Cuntang Wang, and Hao Li. "Effect of air chamber and oil properties on damping characteristics of single-tube pneumatic shock absorber." International Journal of Structural Integrity 9, no. 1 (February 5, 2018): 27–37. http://dx.doi.org/10.1108/ijsi-03-2017-0017.

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Purpose The shock absorber is an important component of vehicle suspension that attenuates the vehicle vibration. Its running state directly affects the performance of the vehicle suspension. The purpose of this paper is to quantitatively study the relationship between damping characteristics and air chamber and oil properties in single-tube pneumatic shock absorber. Design/methodology/approach Combined with the principle of fluid dynamics and hydraulic transmission technology, the rebound stroke and compression stroke mathematical models, and damping characteristics simulation model are established to investigate the effect of the air chamber and oil property on damping characteristics. Findings Research results show that the initial pressure of the air chamber is the key parameter which influences the damping characteristics of the shock absorber. The change of the initial pressure has more impact on damping force, and less impact on the speed characteristic; the initial volume of the air chamber almost has no effect on the damping characteristics. The density and viscosity of the oil have certain influence on the damping characteristics. Therefore, selecting suitable damping oil is very important. Originality/value Using Matlab/Simulink software to build simulation models, its results are very accurate. The conclusions can provide a theoretical reference for the structure design of a single-tube pneumatic shock absorber.

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12

Kamandar, Mohammad Reza. "The Selection, Designing and Analysis of Heavy Duty Tractor Gearbox (ITM8200)." Applied Mechanics and Materials 110-116 (October 2011): 2948–57. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.2948.

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In recent years, ITM 399 series tractor has been manufactured in Iran Tractor Manufacturing Company (ITM), which can be suitable for small farms operations. For big farms operations, minimizing energy consumption, decreasing the time losses and increasing work efficiency, a heavy duty tractor of ITM 8200 series was started to design in the same Company. The gearbox selection, design and analysis for this tractor with the engine power of 154 horse power is studied in this research. The mechanical gearbox equipped with mechanical-hydraulic dynashift system was used in ITM 8200 power transmission system. The dynashift system produces four cases (A, B, C and D) with 8 speeds that produced by main gearbox, which altogether produces 32 forward speeds and 32 reverse speeds for this new tractor. To design the gearbox, with recommended speeds, gearbox ratios and gears ratios was calculated. Then by using the engine torque and slip torque on tractor gearbox, the exerted loads on gears were calculated. After this, by using of American Gear Manufacturing Association (AGMA) method and computer programming design, the gears have been designed. Finally one of the gears in ANSYS software analyzed. The results of this analysis show that: The gears have been designed for tractor gearbox can endure loading and transfer the power requirement of new tractor. The design safety factor of gears has been obtained by ANSYS software approximately equals with safety factor of AGMA methodology. In gear analysis, for applying load to one of gear tooth (unit contact ratio), stress distribution will produce in gear body and especially on neighboring teeth body. For tractor gearbox design, it would be necessary to include slip torque, which will decrease the gear width and gearbox volume.

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13

Kohles, Sean S., and Julie B. Roberts. "Linear Poroelastic Cancellous Bone Anisotropy: Trabecular Solid Elastic and Fluid Transport Properties." Journal of Biomechanical Engineering 124, no. 5 (September 30, 2002): 521–26. http://dx.doi.org/10.1115/1.1503374.

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The mechanical performance of cancellous bone is characterized using experiments which apply linear poroelasticity theory. It is hypothesized that the anisotropic organization of the solid and pore volumes of cancellous bone can be physically characterized separately (no deformable boundary interactive effects) within the same bone sample. Due to its spongy construction, the in vivo mechanical function of cancellous or trabecular bone is dependent upon fluid and solid materials which may interact in a hydraulic, convective fashion during functional loading. This project provides insight into the organization of the tissue, i.e., the trabecular connectivity, by defining the separate nature of this biphasic performance. Previous fluid flow experiments [Kohles et al., 2001, Journal of Biomechanics, 34(11), pp. 1197–1202] describe the pore space via orthotropic permeability. Ultrasonic wave propagation through the trabecular network is used to describe the solid component via orthotropic elastic moduli and material stiffness coefficients. The linear poroelastic nature of the tissue is further described by relating transport (fluid flow) and elasticity (trabecular load transmission) during regression analysis. In addition, an empirical relationship between permeability and porosity is applied to the collected data. Mean parameters in the superior-inferior (SI) orientation of cubic samples n=20 harvested from a single bovine distal femur were the largest p<0.05 in comparison to medial-lateral (ML) and anterior-posterior (AP) orientations: Apparent elastic modulus (2,139 MPa), permeability (4.65×10−10 m2), and material stiffness coefficient (13.6 GPa). A negative correlation between permeability as a predictor of structural elastic modulus supported a parametric relationship in the ML R2=0.4793, AP R2=0.3018, and SI R2=0.6445 directions p<0.05.

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14

Samorodov, Vadym, Grigorii Avrunin, and Dmitrii Harmash. "ANALYSIS OF UNIVERSAL CHARACTERISTICS OF HYDRAULIC FLUID POWER TRANSMISSIONS OPERATING IN A COMPOSITION OF HYDRAULIC-MECHANICAL TRANSMISSIONS FOR DIFFERENT WORKING VOLUMES OF HYDRAULIC MACHINES OF AXIAL PISTON TYPE." Bulletin of the National Technical University «KhPI». Series: Automobile and Tractor Construction, no. 2 (December 3, 2020): 11–18. http://dx.doi.org/10.20998/2078-6840.2020.2.02.

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15

Wang, Huan, Dongye Sun, and Datong Qin. "A new continuously variable transmission system applied to transmission system of the roadheader's cutting unit." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 19 (May 12, 2016): 3590–600. http://dx.doi.org/10.1177/0954406216649404.

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For the existing roadheader, the transmission system of the cutting unit cannot regulate speed and the cutting motor may break down because of the impact vibration. In this study, the power reflux hydraulic transmission system, which is a new continuous variable transmission system, is put forward to ameliorate these problems. The basic characteristics such as the speed ratio, efficiency and torque ratio are analysed on the basis of expounding the basic structure and operational principle of the power reflux hydraulic transmission system. The dynamic model of the transmission system of the cutting unit is established. The pulse signal is used as the simulation of the loads, when the roadheader suddenly encounters the high strength rock. Then the torsional vibration characteristics of the existing roadheader and the roadheader that is equipped with the power reflux hydraulic transmission system are analysed. The contrastive simulation results show that the motor and transmission system vibration of the roadheader which is equipped with the power reflux hydraulic transmission system is markedly attenuated relative to the existing roadheader. So the power reflux hydraulic transmission system can protect the cutting unit's motor and the transmission system.

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16

Lyu, Chang, Zhao Yanqing, and Lyu Meng. "Loader power-split transmission system based on a planetary gear set." Advances in Mechanical Engineering 10, no. 1 (January 2018): 168781401774773. http://dx.doi.org/10.1177/1687814017747735.

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In hydraulic mechanical transmission loaders, a hydraulic torque converter can prevent an engine from stalling due to overloading of the loader during the spading process; however, the hydraulic torque converter also reduces the loader’s fuel economy because of its low transmission efficiency. To address this issue, the study designs an output-power-split transmission system that is applied to a hybrid loader. The designed transmission system removes the hydraulic torque converter in the power transmission system of a traditional loader and adopts a planetary gear set with a compact structure as the dynamic coupling element, thus allowing the output power of the loader to be split transmitted. During shoveling, the loader power-split transmission system based on a planetary gear set can prevent the motor from plugging and over-burning under conditions that ensure that the traction does not decrease. In addition, the transmission efficiency and loader fuel economy are higher in the proposed transmission system than in the power transmission system of a traditional loader. The test results show that the transmission efficiency of the designed system was 13.2% higher than that of the traditional hydraulic mechanical transmission loader.

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17

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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18

Ren, Xiao Li, Xue Mei Shang, Chen Fan, and Yan Ting Du. "A Design of Electric Hydraulic Lifting Device Supported by Mechanical Structure." Key Engineering Materials 621 (August 2014): 317–22. http://dx.doi.org/10.4028/www.scientific.net/kem.621.317.

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In hydraulic transmission, Hydraulic pressure can not support heavy objects long time. For the shortcoming, an electro-hydraulic lifting device is designed with mechanical structural supporting; Electric motor is the motive power. The weight is lifted by hydraulic transmission technology; the base of the device is set up a lifting rigid leg and pushing forward Casters .After hydraulic system lifting heavy objects, the lifting devices rely on the support tube, mechanical positioning tube and rigid supporting legs to lock the lifting position. In order to ensure the same high of support on different positions, a vertical fine adjustment mechanism is set. The design solves the problem that hydraulic transmission cannot lift long time. The lifting device is safe operation, easy moved, accuracy positioning, and stable support, energy-saving and environmental protection.

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19

Ion-Guta, Ion. "The Dynamic Behavior and Stability Analysis of an Electro-Hydro-Mechanical Adaptive Transmission." Applied Mechanics and Materials 760 (May 2015): 589–94. http://dx.doi.org/10.4028/www.scientific.net/amm.760.589.

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In the present paper is presented a numerical simulation of an electro-hydro-mechanical system of adaptive transmission of mechanical power. This system is based on a hydraulic circuit consists of a hydraulic pump with constant flow and a hydraulic motor with variable flow ordered so that the pressure in the circuit to remain constant. For a variation of the ramp and step signal sources of loads, are presented the main features of operation of adaptive transmission. Analysis of dynamic stability of mechanical transmission is made through the linear analysis with Bode diagrams. Simulation of transmission operation is performed with AMESim.

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Zhu, Zhen, Xiang Gao, Dao Yuan Pan, and Yu Zhu. "Efficiency Analysis on Hydro-Mechanical Transmission." Advanced Materials Research 1037 (October 2014): 216–20. http://dx.doi.org/10.4028/www.scientific.net/amr.1037.216.

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In order to study the efficiency on hydro-mechanical transmission (HMT),this paper analyses the stepless speed regulation characteristic,torque characteristic and hydraulic power distributing characteristic of HMT.According to the calculating method of efficiency of the closed pump-motor system and planetary gear,the approximate efficiency formulas of HMT were established.The result shows that:the efficiency of HMT is much higher than that of hydrostatic transmission (HST),the peak efficiency of HMT can reach about 90% and the average efficiency of HMT can exceed more than 80%.

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Lou, Xi Yin. "Design of Walking Stepless Speed System for Caterpillar Feeding Combined Harvester." Applied Mechanics and Materials 697 (November 2014): 194–97. http://dx.doi.org/10.4028/www.scientific.net/amm.697.194.

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Hydro mechanical stepless speed system is a new conbination system of hydraulic transmission and mechanical transmission, which realizes the stepless speed change through the hydraulic transmission and the mechanical transmission to reduce the speed and torque, and to improve transmission efficiency; through optimizing design, The system can realize the differential steering, increase ground clearance. In this paper, the caterpillar feeding combined harvester is the object, the system is composed by the motor, a variable pump single stage planetary gear, hydraulic machinery stepless speed walking system is of wide speed range, simple structure.

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Luo, Jie, Yun Hui Wang, Qian Wen Zhao, Hui Guo, and Fei She. "Study on Liquid Volume Measurement Based on Wireless Transmission and Hydraulic Sensors." Applied Mechanics and Materials 263-266 (December 2012): 392–97. http://dx.doi.org/10.4028/www.scientific.net/amm.263-266.392.

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Based on hydraulic sensors and wireless transmission, a new wireless measurement method of liquid volume in a tank is introduced. This measurement system includes hydraulic pressure sensors, A/D converter, GPRS (General Packet Radio Service) module and upper monitor in a computer, from which the users can get aware of the liquid volume in a tank at any time. The measurement system has been built，calibrated and tested. The experimental results show that this measurement system works well and the measurement error is less than 1%.

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23

Wang, Chengbin, Long Quan, and Hengan Ou. "The method of restraining hydraulic impact with active adjusting variable damping." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 11 (October 25, 2018): 3785–94. http://dx.doi.org/10.1177/0954406218809740.

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Hydraulic impact is a common phenomenon in the hydraulic transmission system, which has great influence on the smooth operation of hydraulic transmission system and the service life of hydraulic components, especially to the hydraulic system with large inertia load. In order to restrain the hydraulic impact, the causes for hydraulic impact are analyzed, and a new method of active adjusting variable damping was developed. The principle of this method is to make use of the reserving signal to predict the timing of the hydraulic shock wave actively and adjust the opening size of the damped hole accordingly to restrain the hydraulic impact. This method was applied to the hydraulic system of a cinder scraper's rail trolley as a case study through simulation and experimental testing. The results show that the method has the advantages of quick response speed, effective restraint of hydraulic impact in the system and low energy consumption. By using this method, the hydraulic impact in the hydraulic system of the cinder scraper's rail trolley can be effectively controlled without affecting the response speed of the system.

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Li, Yuan, Jie Yue, Qiu Bo Huang, and Yan Ping Sun. "Dynamic Simulation Analysis of Hydraulic Mechanical Power Split CVT." Advanced Materials Research 971-973 (June 2014): 458–62. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.458.

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Completed solid model of hydraulic mechanical power split CVT using Pro/E software basing on the transmission principle, achieved the whole transmission without interference assemble by the interference analysis and checking the gap. Carried on dynamics simulation analysis using ADAMS software, obtained the variation of plungers’ centroid and the bearing force in the rear end cover, it laid the theoretical foundation for subsequent experimental analysis.

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25

Dai, Hanzheng, Lirong Wan, Qingliang Zeng, Zhenguo Lu, Zhiyuan Sun, and Wenting Liu. "Method and Test Bench for Hydro-Mechanical Continuously Variable Transmission Based on Multi-Level Test and Verification." Machines 9, no. 12 (December 16, 2021): 358. http://dx.doi.org/10.3390/machines9120358.

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According to the structural characteristics of Hydro-mechanical continuously variable transmission (HMCVT), a multi-functional test bench was developed, and the basic structure, working principle, and test functions of the test bench were introduced. The test bench has the following characteristics: To analyze the impact of mechanical transmission and hydraulic transmission on the HMCVT transmission system, the performance can be tested separately by using a test bench; the coupling characteristics of the hydraulic transmission and mechanical transmission can also be tested; it can also test and verify the performance of the HMCVT transmission system and the control system; the test bench has a simple structure, diverse functions, and convenient operation. Using the multi-functional test bench, this paper proposes a method of multi-level test and verification. Through this method, the simulation models are revised and improved many times, and the accuracy of the models is improved, which are consistent with the physical model, and eventually, the accuracy of the simulation result is improved. This method is used to test and verify the hydraulic transmission system, analyze the characteristics of the hydraulic transmission system, and verify the feasibility and practicability of the multi-level verification method.

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LI, Hua. "High-efficiency Hydraulic Torque-converting Transmission System." Journal of Mechanical Engineering 46, no. 13 (2010): 116. http://dx.doi.org/10.3901/jme.2010.13.116.

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Liu, Hongwei, Yonggang Lin, Maoshun Shi, Wei Li, Haigang Gu, Quankun Xu, and Le Tu. "A novel hydraulic-mechanical hybrid transmission in tidal current turbines." Renewable Energy 81 (September 2015): 31–42. http://dx.doi.org/10.1016/j.renene.2015.02.059.

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28

Orekhov, A. A., S. V. Timokhin, I. A. Spitsyn та K. Z. Kuhmazov. "ОБЕСПЕЧЕНИЕ РАЦИОНАЛЬНОГО ТЕМПЕРАТУРНОГО РЕЖИМА КОРОБКИ ПЕРЕДАЧ АВТОМОБИЛЯ КАМАЗ СЕЛЬСКОХОЗЯЙСТВЕННОГО НАЗНАЧЕНИЯ". Niva Povolzh`ia, № 4(53) (22 листопада 2019): 134–40. http://dx.doi.org/10.36461/np.2019.52.3.020.

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Анотація:

В работе рассмотрены особенности эксплуатации автомобилей при низких температурах окружающего воздуха, а также существующие способы и средства тепловой подготовки их агрегатов. Если вопросы тепловой подготовки и поддержания рационального температурного режима двигателей внутреннего сгорания автомобилей в значительной степени решены, то для агрегатов их трансмиссий они требуют дальнейшего развития. Проанализировано применение тепловых аккумуляторов для тепловой подготовки агрегатов автомобилей. Предложен способ и система обеспечения рационального температурного режима коробки передач автомобиля КамАЗ с использованием теплового аккумулятора фазового перехода. Сформулированы цель и задачи исследований. Проведен расчет объема теплоаккумулирующего материала, необходимого для подогрева трансмиссионного масла коробки передач автомобиля КамАЗ до рациональной температуры в условиях зимней эксплуатации. Разработаны гидравлическая и функциональная схемы системы регулирования температуры масла в коробке передач автомобиля КамАЗ с тепловым аккумулятором фазового перехода, применение которой обеспечит быстрый выход на рациональный температурный режим коробки передач автомобиля и его стабилизацию как в зимнее, так и в летнее время года и, тем самым, снизит износ деталей, механические потери в коробке передач, расход топлива автомобилем.The paper discusses the features of operation of cars at low ambient temperatures, as well as existing methods and means of heat treatment of their units. If the issues of thermal preparation and maintaining a rational temperature regime of automobile internal combustion engines are largely resolved, then for the units of their transmissions they require further development. The application of heat accumulators for the thermal preparation of automobile units is analyzed. A method and system for ensuring a rational temperature regime of a KamAZ car gearbox using a phase transition heat accumulator is proposed. The purpose and objectives of research are formulated. The calculation of the volume of heat-accumulating material necessary for heating the gear oil of a KamAZ car gearbox to a rational temperature in winter conditions has been carried out. A hydraulic and functional diagram of the oil temperature control system in a KamAZ car gearbox with a phase-transfer heat accumulator has been developed, the use of which will provide quick access to the rational temperature regime of the car gearbox and its stabilization in both winter and summer seasons and, thereby, reduce wear of parts, mechanical losses in the gearbox, fuel consumption by the car.

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Yang, Shujun, Yong Bao, and Chengyuan Fan. "Study on characteristics of hydro-mechanical transmission in full power shift." Advances in Mechanical Engineering 10, no. 7 (July 2018): 168781401879066. http://dx.doi.org/10.1177/1687814018790668.

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Анотація:

This article shall explore the characteristics of hydro-mechanical transmission in power shift. Based on the double brakes overlapping, the adjustment of the displacement ratio of variable-displacement hydraulic component is considered, and then a new full power shift method is proposed. Models respectively for speed, torque, and power in the power shift process are built. The ideal power shift timing is deduced, with the ratio between speed of fixed-displacement hydraulic component and input speed being the criterion. By combining theoretical analysis and experimental studies, it shows that in power shift process by regulating the displacement ratio of variable-displacement hydraulic component, the interchange between high- and low-pressure sides in closed hydraulic circuit can be completed, and power transition can be thus realized. A new full power shift method is put forward, in which the shift process is divided into five stages: current range, prior stable stage, power transition stage, post stable stage, and target range. Experiments on full power shift process prove that the full power shift method is not only feasible but also can remove the rotational speed fluctuation in power shift process and realize normal full power transmission of output power.

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30

Zeng, Qingliang, Kuidong Gao, Haizhong Zhang, Shoubo Jiang, and Kao Jiang. "Vibration analysis of shearer cutting system using mechanical hydraulic collaboration simulation." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 231, no. 4 (April 20, 2017): 708–25. http://dx.doi.org/10.1177/1464419317705986.

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The cutting unit of a mining shearer is composed of a drum, gear transmission and hydraulic height adjusting mechanism. To obtain the dynamic characteristics of crucial components in the coal cutting process, a model of a drum cutting coal was constructed using LS-DYNA. The model of gear transmission was constructed with Adams, and a model of the hydraulic height adjusting system was constructed with AMESim. Data transmission and co-simulation of these three models were implemented with MATLAB. Changes of the meshing force, acceleration and amplitude–frequency characteristics of key gears under different conditions were obtained. From the research, we conclude that it is effective and feasible to apply the multi-software co-simulation used by this paper to research a complex mechanical–hydraulic system such as a shearer cutting unit; supports from a hydraulic cylinder can decrease the meshing force of gears to some extent; and the meshing force of gears increases significantly as the mining height of the drum increases.

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31

Yu, Jin, Zhu Cao, Min Cheng, and Rongzhao Pan. "Hydro-mechanical power split transmissions: Progress evolution and future trends." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 233, no. 3 (January 23, 2018): 727–39. http://dx.doi.org/10.1177/0954407017749734.

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Анотація:

The hydro-mechanical power split transmission is an important form of hydraulic hybrid transmission, combining the stepless speed characteristics of hydraulic transmission and the high efficiency of mechanical transmission. Recently, the hydro-mechanical power split transmission, with its relatively large potential for energy recovery and improving the environment, and its low cost, has attracted many scholars from all over the world. Because there are many types of hydro-mechanical power split transmission, the different forms are complex, and researchers across the world are relatively dispersed, it has experienced a long and arduous development process. Therefore, it is important to summarize the types, developments, and achievements of this transmission. From the recent literature at home and abroad, this paper summarizes developments, key techniques and trends, analyses problems and difficulties in design and application, discusses the methods for solving these problems, and provides references for the development and application of hydro-mechanical power split transmission.

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32

Baumgartl, Th, and B. Köck. "Modeling Volume Change and Mechanical Properties with Hydraulic Models." Soil Science Society of America Journal 68, no. 1 (January 2004): 57–65. http://dx.doi.org/10.2136/sssaj2004.5700.

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33

Wang, Bin, Xin Yan Lin, Shi Heng Li, and Bin Zhang. "Research on a Hub Hydraulic Motor Driving System of Electric Vehicle." Advanced Materials Research 711 (June 2013): 482–85. http://dx.doi.org/10.4028/www.scientific.net/amr.711.482.

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This paper applies hydraulic transmissions advantages of small volume, light weight, quick response, stable transmission, great transmission torque and agile spatial arrangement etc. to hub electromotor drive electric vehicle, substitutes hub hydraulic motors for hub electromotors, propose a hub hydraulic motor driving system of electric vehicle. The constitution and working principle of system is then described in detail. The hub hydraulic motor driving system proposed in this paper will help electric vehicle to realize continuously variable transmission, leave out reducer and differential mechanism, reduce the unsprung mass of electric vehicle, make the spatial arrangement of electromotors and batteries more flexible, and achieve the integration control of electric vehicles driving, braking and steering.

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34

Zhao, Xin, Xiangdong Ni, Qi Wang, Mingxi Bao, Sheng Li, and Shuangman Han. "Research on adaptive control strategy of hydraulic mechanical continuously variable transmission of a cotton picker." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 17 (April 2, 2020): 3335–45. http://dx.doi.org/10.1177/0954406220916536.

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Hydraulic mechanical continuously variable transmission has the advantages of good hydraulic stepless speed regulation performance and high efficiency of mechanical transmission, which can achieve the optimal matching of transmission system load and power source. In this article, an adaptive control strategy based on radial basis function neural network and proportional–integral–derivative control was proposed. The speed compound control method was used to solve the problems that the output speed of the hydraulic mechanical continuously variable transmission system was poor at the variable speed input and was difficult to control. The throttle opening and the engine speed were used as controller inputs. The pump–motor's displacement ratio and the output speed were used as controller outputs. Finally, the output speed of the cotton picker was stably controlled. Simulation and experimental results show that the transmission can quickly respond to the target speed and had little fluctuation based on different initial input speeds. The control strategy had good control precision and robustness. Compared with the traditional proportional–integral–derivative algorithm, the average steady-state error of the system output speed was controlled between ±0.0125%. The proposed algorithm based on radial basis function neural network proportional–integral–derivative adaptive control strategy had obvious control effect, and the stability of the speed output of the system was improved under the nonlinear input complex conditions. It provided research for the speed ratio adjustment and control of the hydraulic mechanical continuously variable transmission of the cotton picker.

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35

Krumboldt, L. N., F. P. Golovashkin, and A. G. Strelkov. "Hydrostatic drive in transmissions of special self-propelled vehicles." Izvestiya MGTU MAMI 7, no. 1-1 (January 10, 2013): 96–104. http://dx.doi.org/10.17816/2074-0530-68216.

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Анотація:

The authors analyzed the working principle of hydrostatic transmission with adjustable hydraulic machines. A method for determining the range of variation of the transmission ratio of the controlled hydraulic machines with power loss is presented as well. There are mechanical properties of hydrostatic transmission with adjustable hydraulic machines with sequential mode acceleration of its driven member. There is considered full flow transmission of a utility tractor "BIMA-300" (France), and its evaluation is given.

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36

Savaresi, S. M., F. Taroni, F. Prevedi, and S. Bittanti. "On the design and tuning of the controllers in a power-split continuously variable transmission for agricultural tractors." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 217, no. 8 (August 1, 2003): 745–59. http://dx.doi.org/10.1243/09544070360692131.

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Анотація:

In this work, a power-split continuously variable transmission (CVT) used in high-power tractors is considered. Power-split CVTs are characterized by the combination of a traditional discontinuous mechanical transmission and a continuously variable transmission. This provides, at the same time, smooth variations of the transmission ratio and high efficiency of the overall transmission system. The CVT considered in this paper is a hydrostatic power-split unit conceived for top-power agricultural tractors. The goal of this paper is to present a case study on the design and tuning of the control system structure for this type of CVT. This structure consists of three main parts: a servo controller on the internal current of the valve of the hydraulic transmission; a servo controller on the hydraulic transmission ratio; a synchronizer which coordinates the hydraulic and the mechanical parts of the CVT. The design, tuning and testing of this set of automatic controllers is presented.

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37

Zhang, Guangqing, Hengtong Zhang, Yanyan Ge, Wei Qiu, Maohua Xiao, Xiaomei Xu, and Minghui Zhou. "Mechanical Efficiency of HMCVT under Steady-State Conditions." Shock and Vibration 2021 (September 3, 2021): 1–14. http://dx.doi.org/10.1155/2021/4275922.

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Анотація:

Hydromechanical continuously variable transmission (HMCVT) technology has been widely used due to its advantages of ride comfort and fuel economy. The relatively uniform efficiency expression of HMCVT is obtained by studying torque and transmission ratios to reveal steady-state characteristics and predict the output torque. Mathematical models of torque ratios are derived by analyzing the HMCVT system power flow and calculating the equivalent meshing power of epicyclic gear train and efficiency for the hydraulic system. The relationship between mechanical system transmission and hydraulic system parameters is established using the torque ratios, and a mechanical system demanding surface is proposed. Two numerical examples of the HMCVT system with single and dual variable units are demonstrated to establish an effective and convenient method. The method is validated through a physical prototype TA1-02 test.

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38

Wang, An Lin, Bin Nan Yue, He Liu, Peng Ju Zhou, and Bang Fu Gong. "The System Model of the Bulldozer Machine Based on the Theory of Design Space Integration and its Experimental Verification." Advanced Materials Research 201-203 (February 2011): 1402–7. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.1402.

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Анотація:

Bulldozer transmission and control of physical energy involved in a variety of forms, many parts of local parameters for the overall performance of mutual coupling, and it is difficult to quantify. To solve the bulldozer engineering machinery represents more conditions, more energy state, and difficult to quantification, this paper integrated chassis, ground mechanics, mechanical, hydraulic, hydraulic transmission and other theories, the use of mechanical ,electronic and hydraulic integration design space thought, a hydraulic transmission system model bulldozer is established. For the dynamic performance of the hydraulic drive bulldozer prototype test, testing and simulation complement each other, through the test results to verify the accuracy of models and simulation, through the simulation to make up for poor reproducibility of test defects. To achieve the applications of engineering in typical models, the performance analysis platform of hydraulic drive bulldozer has been developed.

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39

Guebeli, M., J. D. Micklem, and C. R. Burrows. "Maximum Transmission Efficiency of a Steel Belt Continuously Variable Transmission." Journal of Mechanical Design 115, no. 4 (December 1, 1993): 1044–48. http://dx.doi.org/10.1115/1.2919254.

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A mathematical model of the power transmission through a Van Doorne steel belt continuously variable transmission is developed. The approach is based on a simplified viscous oil shear stress model. This enables the determination of the power transmission loss resulting from shearing the oil film along the traction line. The power to maintain the necessary hydraulic clamping forces is taken into account to optimize the power transmission efficiency. The analytical solution is evaluated numerically and compared with experimental results. Variations in the hydraulic pump displacement that are determined by the required ratio adjustment dynamics show that with a sufficiently small pump, peak efficiencies exceeding 97 percent are possible.

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40

Wei, Xiaozhao, Lei Wang, Xiangdong Ni, Shuangman Han, Xin Zhao, and Shen Li. "Speed control strategy for pump-motor hydraulic transmission subsystem in hydro-mechanical continuously variable transmission." Journal of Mechanical Science and Technology 35, no. 12 (December 2021): 5665–79. http://dx.doi.org/10.1007/s12206-021-1034-x.

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41

Su, Ming, Zhong Ping Xi, Dong Min Zhu, Zhong Chang Gu, and Heng Wang. "Research on Electrical Transmission System with Hydraulic Coupler." Advanced Materials Research 871 (December 2013): 77–82. http://dx.doi.org/10.4028/www.scientific.net/amr.871.77.

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Анотація:

In this paper, a simulation model of the electrical transmission system with hydraulic coupler is established based on the analysis of the mechanical characteristics of the motor, the original characteristic curves of the hydraulic coupler and the torque equations of the pump wheel and the turbine. The starting and impact process of the system are simulated and the results reveal the mechanism of the characteristics of the starting process of the system and the isolation effect of the torsional vibration of the hydraulic coupler.

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42

Wang, Juan, and Guang Li Zhou. "Technique of Digital Electro Hydraulic Automatic Control of Hydro Mechanical Transmission." Advanced Materials Research 383-390 (November 2011): 3493–98. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.3493.

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Based on a high speed electromagnetism valve and a two side throttle slide valve, a digital shift pressure regulation valve was designed. The electromagnetism valve was driven directly by the digital signal of electricity control system, the automatic shifting and the pressure’s real time regulation of shift clutch was achieved. The principle of the electricity control system was stated, based on the characteristic of the electromagnetism valve, the drive circuit was designed. The digital electro hydraulic automatic control system was installed on the heavy vehicle with hydro mechanical transmission, and tested. According to the test data of shift process, the control strategy is analyzed, and the validity and feasibility of the control system is proved.

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43

Zhang, Wei, Yanjun Liu, Huaqing Luo, Gang Xue, and Jian Zhang. "Experimental and Simulative Study on Accumulator Function in The Process of Wave Energy Conversion." Polish Maritime Research 23, no. 3 (September 1, 2016): 79–85. http://dx.doi.org/10.1515/pomr-2016-0035.

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Abstract In this paper, a floating-buoy wave energy converter using hydrostatic transmission system is studied. The entire work progress of wave energy power generation device is introduced, and the hydraulic transmission principles are emphasized through the simulation to verify the feasibility of design principle of hydraulic transmission system. The mathematical model of the accumulator is established and applied in the AMEsim simulation. The simulation results show that the accumulator plays an important role in the wave power hydraulic transmission system and that the correct configuration of accumulator parameters can improve the rapidity and stability of the system work. Experimental results are compared with the simulation results to validate the correctness of the simulation results. This would provide a valuable reference to the optimal design of wave power generation.

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44

Xiong, Shaoping, Gabriel Wilfong, and John Lumkes. "Components Sizing and Performance Analysis of Hydro-Mechanical Power Split Transmission Applied to a Wheel Loader." Energies 12, no. 9 (April 28, 2019): 1613. http://dx.doi.org/10.3390/en12091613.

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Анотація:

The powertrain efficiency deeply affects the performance of off-road vehicles like wheel loaders in terms of fuel economy, load capability, smooth control, etc. The hydrostatic transmission (HST) systems have been widely adopted in off-road vehicles for providing large power density and continuous variable control, yet using relatively low efficiency hydraulic components. This paper presents a hydrostatic-mechanical power split transmission (PST) solution for a 10-ton wheel loader for improving the fuel economy of a wheel loader. A directly-engine-coupled HST solution for the same wheel loader is also presented for comparison. This work introduced a sizing approach for both PST and HST, which helps to make proper selections of key powertrain components. Furthermore, this work also presented a multi-domain modeling approach for the powertrain of a wheel loader, that integrates the modeling of internal combustion (IC) engine, hydraulic systems, mechanical transmission, vehicle(wheel) dynamics, and relevant control systems. In this modeling, an engine torque evaluation method with a throttle position control system was developed to describe the engine dynamics; a method to express the hydraulic loss of the axial piston hydraulic pump/motor was developed for modeling the hydraulic transmission; and a vehicle velocity control system was developed based on altering the displacement of a hydraulic unit. Two powertrain models were developed, respectively, for the PST and HST systems of a wheel loader using MATLAB/Simulink. The simulation on a predefined wheel loader drive cycle was conducted on both powertrain models to evaluate and compare the performance of wheel loader using different systems, including vehicle velocity, hydraulic displacement control, hydraulic torque, powertrain efficiency, and engine power consumption. The simulation results indicate that the vehicle velocity controller developed functions well for both the PST and HST systems; a wheel loader using the proposed PST solution can overall save about 8% energy consumption compared using an HST solution in one drive cycle. The sizing method and simulation models developed in this work should facilitate the development of the powertrains for wheel loaders and other wheeled heavy vehicles.

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45

Longmore, D. K., and A. Schlesinger. "Transmission of Vibration and Pressure Fluctuations Through Hydraulic Hoses." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 205, no. 2 (May 1991): 97–104. http://dx.doi.org/10.1243/pime_proc_1991_205_319_02.

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46

Lou, Xi Yin. "Study on the Design of Composite Transmission System for Crawler Type Full-Feeding Combine Harvester." Applied Mechanics and Materials 722 (December 2014): 80–83. http://dx.doi.org/10.4028/www.scientific.net/amm.722.80.

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Анотація:

Transmission system is an important part of combine harvester, and is the main indicator to measure the level of technology. This paper presents the design of a composite hydraulic mechanical transmission system for combine harvester. The system consists of engine, variable pump, quantitative hydraulic motor, planetary reducer, driving wheel, crawler etc. Author analyzes the continuous variable speed regulation characteristics of transmission; determines selection method of hydraulic components and mechanical parameters. Composite transmission system can make the engine is close to full load operation, improve combine harvester productivity and fuel economy. By optimizing the transmission system, combine harvester can reduce speed, increases the torque, realizes continuous variable speed. Practice has proved: this dynamic composite transmission system with fast response, high efficiency, and reliable, low failure rate. At the same time, combine harvester has the advantages of simple operation, forward, backward or turning without shifting, greatly reduce the labor intensity of the operator.

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47

Janulevičius, Algirdas, and Kazimieras Giedra. "ANALYSIS OF MAIN DYNAMIC PARAMETERS OF SPLIT POWER TRANSMISSION." TRANSPORT 23, no. 2 (June 30, 2008): 112–18. http://dx.doi.org/10.3846/1648-4142.2008.23.112-118.

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Анотація:

The review carried out had shown one basic approach of split power transmission to the organization of drive which is applied to stepless transmissions of tractors and parallel hybrid cars. In the split power transmission the power split device uses a planetary gear. Tractor engine power in the split power transmission is transmitted to the drive shaft via a mechanical and hydraulic path. The theoretical analysis of main parameters of the split power transmission of the tractor is presented. The angular velocity of sun and coronary gears of the differential set is estimated by solution of the system of equations in which one equation is made for planetary differential gear, and another ‐ for hydrostatic drive. The analysis of the transmission gear‐ratio dependencies on the ratio of hydraulic machines capacities is carried out. Dependence of the variation of angular velocity of the coronary and the sun gears on the ground speed of the tractor is presented. Dependence of sum shaft torque and its constituents, carried by mechanical and hydraulic lines, on sum shaft angular velocity and ground speed of tractor and engine speed is also presented.

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48

Kitsios, E. E., and R. F. Boucher. "Transmission Line Modelling of a Hydraulic Position Control System." Proceedings of the Institution of Mechanical Engineers, Part B: Management and engineering manufacture 200, no. 4 (November 1986): 229–36. http://dx.doi.org/10.1243/pime_proc_1986_200_077_02.

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The transmission line modelling (TLM) method is briefly discussed, showing how lumped dynamic components can be represented by equivalent lines. A hydraulic position control system was modelled by the TLM method, requiring mechanical and fluid transmission line models and a special ‘integrator’ line. The theoretical responses to step inputs are compared with experimental ones. Good agreement is shown.

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49

Lai, Wen-Bin, De-Tang Li, and Yong-He Xie. "Experimental and Simulative Study on Hydraulic Energy Grading Control System in the Process of Wave Energy Conversion." Journal of Computational and Theoretical Nanoscience 16, no. 9 (September 1, 2019): 3683–91. http://dx.doi.org/10.1166/jctn.2019.8366.

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In the development and utilization of wave energy, the wave energy is first converted to mechanical energy, then to hydraulic energy, and finally to electrical energy. Due to the instability and randomness of the wave energy, which makes the energy easily fluctuate during the conversion process. In this paper, an oscillating wave power generation device based on hydraulic transmission system is taken as the study object, and the factors affecting the stability of the hydraulic transmission system are studied by model experiment and AMESim simulation. The results of the test show that the stability can be improved by optimizing the parameters in the hydraulic transmission system according to different wave conditions; However, the optimized hydraulic system can only ensure that the wave energy within a certain wave condition can be stably converted; when the wave condition changes greatly, the hydraulic transmission system is still easy to cause fluctuations. In addition, a Hydraulic Energy Grading Control System is proposed, which further improves the stability of the wave energy during the conversion process.

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50

Zhang, Fang. "Design of Hydraulic Control System for Press Machine and Analysis on Its Fluid Transmission Features." International Journal of Heat and Technology 39, no. 1 (February 28, 2021): 161–69. http://dx.doi.org/10.18280/ijht.390117.

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The stability and reliability of hydraulic control system have a direct bearing on the overall dynamic performance of the press machine. Hydromechanical analysis on the hydraulic control system is of theoretical and practical significance to improving the transmission performance and structural design of the entire press machine. From a quantitative perspective, this paper firstly analyzes the fluid transmission features of the hydraulic control system for the press machine, and presents the fluid transmission route and design drawings of the hydraulic control system. The next step is the design of the hydraulic control system. The authors specified the steps of design and calculation for the hydraulic control cylinder, and the principles for determining the power of the diesel engine. After that, experiments were carried out to verify the dynamic and static features of the designed system, and prove that our system is scientific and rational.

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