To see the other types of publications on this topic, follow the link: Hydraulic pump.
Journal articles on the topic 'Hydraulic pump'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Hydraulic pump.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Zagar, Philipp, Helmut Kogler, Rudolf Scheidl, and Bernd Winkler. "Hydraulic Switching Control Supplementing Speed Variable Hydraulic Drives." Actuators 9, no. 4 (December 4, 2020): 129. http://dx.doi.org/10.3390/act9040129.
Full textAbstract:
Primary control of linear motion by variable speed electric motors driving a hydraulic cylinder via a constant displacement pump is an established and successful concept with a frequent use in industry. One problem arises when low or zero motion speed has to be realized under high pump pressure conditions. Such load scenarios occur frequently in certain pressing processes, e.g., for sintering or veneering. Most pumps have a lower speed limit, below which critical tribological conditions occur which impair lifespan and efficiency. In addition, pump speed control and pump fluctuation suffer from the mixed lubrication conditions in such an operation range. For a circumvention of such low speed pump operation, a digital valve control concept is presented and studied in this paper. Valve control is used in load holding phases with low speed. Pressure is provided by an accumulator which is charged by the pump in short charging cycles at reasonable pump speeds. It is shown that the mean control error during load holding phase lies within the desired band and the fluctuations of the control force are lower than those of the pump control. In addition, the unfavorable pump operation conditions can be avoided via digital control.
2
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.
Full textAbstract:
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.
3
Azzam, Israa, Keith Pate, Jose Garcia-Bravo, and Farid Breidi. "Energy Savings in Hydraulic Hybrid Transmissions through Digital Hydraulics Technology." Energies 15, no. 4 (February 13, 2022): 1348. http://dx.doi.org/10.3390/en15041348.
Full textAbstract:
Hydraulic hybrid drivetrains, which are fluid power technologies implemented in automobiles, present a popular alternative to conventional drivetrain architectures due to their high energy savings, flexibility in power transmission, and ease of operation. Hydraulic hybrid drivetrains offer multiple environmental benefits compared to other power transmission technologies. They provide heavy-duty vehicles, e.g., commercial transportation, construction equipment, wagon handling, drilling machines, and military trucks, with the potential to achieve better fuel economy and lower carbon emissions. Despite the preponderance of hydraulic hybrid transmissions, state-of-the-art hydraulic hybrid drivetrains have relatively low efficiencies, around 64% to 81%. This low efficiency is due to the utilization of conventional variable displacement pumps and motors that experience high power losses throughout the drive cycle and thus fail to maintain high operating efficiency at lower volumetric displacements. This work proposes and validates a new methodology to improve the overall efficiency of hydraulic hybrid drivetrains by replacing conventional pump/motor units with their digital counterparts. Compared to conventional pump/motors, the digital pump/motor can achieve higher overall efficiencies at a wide range of operating conditions. A proof-of-concept digital pump/motor prototype was built and tested. The experimental data were integrated into a multi-domain physics-based simulation model of a series hydraulic hybrid transmission. The proposed methodology permits enhancing the overall efficiency of a series hydraulic hybrid transmission and thus allows for energy savings. Simulating the system at moderate load-speed conditions allowed achieving a total efficiency of around 89%. Compared to the average efficiency of the series hydraulic hybrid drivetrains, our simulation results reveal that the utilization of the state-of-the-art digital pump enables improving the total efficiency of the series hydraulic hybrid drivetrain by up to 25%.
4
Zhang, Tianxiao, and Nong Zhang. "Vibration Modes and the Dynamic Behaviour of a Hydraulic Plunger Pump." Shock and Vibration 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/9679542.
Full textAbstract:
Mechanical vibrations and flow fluctuation give rise to complex interactive vibration mechanisms in hydraulic pumps. The working conditions for a hydraulic pump are therefore required to be improved in the design stage or as early as possible. Considering the structural features, parameters, and operating environment of a hydraulic plunger pump, the vibration modes for two-degree-of-freedom system were established by using vibration theory and hydraulic technology. Afterwards, the analytical form of the natural frequency and the numerical solution of the steady-state response were deduced for a hydraulic plunger pump. Then, a method for the vibration analysis of a hydraulic pump was proposed. Finally, the dynamic responses of a hydraulic plunger pump are obtained through numerical simulation.
5
Ułanowicz, Leszek, Grzegorz Jastrzębski, Michał Jóźko, Ryszard Sabak, and Paweł Szczepaniak. "Hydraulic plunger pump contamination sensitivity evaluation." Journal of KONBiN 48, no. 1 (December 1, 2018): 371–83. http://dx.doi.org/10.2478/jok-2018-0061.
Full textAbstract:
Abstract The correct operation of the hydraulic pump and achieving the assumed durability depends on the purity of the used working fluid. The research paper discusses a method for evaluating the contamination sensitivity of a hydraulic plunger pump. The theoretical grounds for evaluating the contamination sensitivity of hydraulic plunger pumps of a hydraulic drive based on the contamination sensitivity factor were presented. An example of evaluating contamination sensitivity of an NP-34M hydraulic plunger pump was discussed.
6
Chumakov, Pavel V., Alexei V. Martynov, Alexander V. Kolomeychenko, Ismail H. Hasan, and Alla S. Kolomeychenko. "Evaluation of Technical Condition of Round Gear Hydraulic Pumps of Tractor Mounted Hydraulic Systems." Engineering Technologies and Systems 30, no. 3 (September 30, 2020): 426–47. http://dx.doi.org/10.15507/2658-4123.030.202003.426-447.
Full textAbstract:
Introduction. In the technical service enterprises, the reliable estimation of a technical condition of hydraulic gear pumps of tractor mounted hydraulic systems is a priority in introducing new repair processes. The absence of data of manufacturing plants on limiting wear of working surfaces of hydraulic pump details, when the decision on repair is taken, leads to the necessity of carrying out additional researches. In this regard, the purpose of work is to find the limit wear values for working surfaces of details of round gear hydraulic pumps. Materials and Methods. The laboratory tests of used round gear hydraulic pumps were carried out according to the method developed in the GOSNITI on the hydraulic bench of the KI-28097M-GOSNITI. The controlled parameter during tests is the pump delivery rate. Results. The results of laboratory bench and micrometer studies of used round gear hydraulic pumps are presented in the work. The mathematical model of pump delivery rate dependence on statistically significant independent factors is obtained. The limit values for wear of working surfaces of round gear hydraulic pump details are determined by the steepest ascent method on the received mathematical model. Discussion and Conclusion. According to the results of the input bench control of the used round gear pumps, 81% of the tested units were operated in the over-extreme limit state. The limit values for wear of working surfaces of round gear hydraulic pump details obtained by the steepest ascent method make it possible to make a conclusion about the necessity of their restoration in repairing at technical service enterprises.
7
Akanova, G., A. Sadkowski, S. Podbolotov, A. Kolga, and I. Stolpovskikh. "Ways to reduce hydraulic losses in multistage centrifugal pumping equipment for mining and oil-producing industries." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 6 (2021): 77–84. http://dx.doi.org/10.33271/nvngu/2021-6/077.
Full textAbstract:
Purpose. To study hydraulic losses in pumping units during pumping and transportation of liquids, to develop the design and technology solutions to improve the energy efficiency of centrifugal pumps in the mining and oil-producing industries. Methodology. In the theoretical and experimental analysis of hydraulic losses during the transportation of liquids, the hydraulics and experimental analysis methods were used. Findings. As a result of the research carried out, a new design scheme of a multistage centrifugal pump has been developed, providing a coaxial arrangement of impellers, which allows reducing hydraulic losses in pump elements and increasing the energy efficiency of pumping units. Originality. Based on the analysis of existing designs of multistage blowers of axial and centrifugal types, the distribution of hydraulic losses in the elements of a centrifugal blower with coaxial impellers is considered. Experimental dependences on the establishment of pressure flow and power characteristics are presented. Based on the accounting of hydraulic losses, the energy efficiency of the design of the pumping unit with the coaxial arrangement of the impellers was assessed. Practical value. The new design of a centrifugal pump with coaxial impellers reduces hydraulic losses by more than 23% compared to traditional designs of centrifugal pumps. The results of the work can be used by design, research, and industrial organizations engaged in the design and operation of pumping equipment.
8
Breidi, Farid, Jordan Garrity, and John Lumkes. "Design and Testing of Novel Hydraulic Pump/Motors to Improve the Efficiency of Agricultural Equipment." Transactions of the ASABE 60, no. 6 (2017): 1809–17. http://dx.doi.org/10.13031/trans.11557.
Full textAbstract:
Abstract. Hydraulic systems are prevalent in agricultural machinery and equipment and can be found transmitting power for vehicle drive wheels, powering attachments, and controlling motion (booms, steering, load height, etc.). Agricultural applications of fluid power have advanced in terms of capability and efficiency, but opportunities remain for significant improvements in efficiency, noise reduction, and reliability. The average system-level hydraulic efficiency of current mobile agricultural machines is only 21.1%. Because nearly all hydraulic systems use pumps to convert engine power to fluid power, improving the efficiency of the pumps (and motors when used as actuators) significantly impacts the system efficiency. This work examines the impact of using more efficient digital pump/motors to improve the overall efficiency of agricultural equipment, such as tractors, harvesters, planters, fertilizers, sprayers, and attachments. Maintaining higher pump/motor efficiency throughout the operating range is the central principal for the energy savings. Currently used variable-displacement pumps have low efficiencies at low displacement levels due to constant losses that do not scale with the power produced. Digital pump/motors minimize these inefficiencies because energy losses scale more closely with the power produced. Experimental results indicate an average efficiency of 85% when operating at 20% to 100% displacement. This efficiency is 15% to 20% higher on average than with current variable-displacement axial piston pumps. This study demonstrates that achieving this improvement in the efficiency of the pump/motors used in tractors and harvesters alone would conservatively save $61.7 million worth of energy annually for end users in the U.S. agricultural sector. Keywords: Agricultural equipment, Digital hydraulics, Efficiency improvement, Hydraulic pump/motor.
9
Jing, Bao De, Bin Bin Lv, Zeng Jun Pan, Long Yi, Zhu Ge Gang, and Jian Yu Jiang. "A Research Based on the Deep Self-Balanced Hydraulic Pump." Advanced Materials Research 305 (July 2011): 411–15. http://dx.doi.org/10.4028/www.scientific.net/amr.305.411.
Full textAbstract:
The article will give information about the status of sea water pump technology research, carry out the analysis of the water pump slipper, piston and water pump housing and other key parts of hydraulic pumps, and finally make some optimization and innovation. In addition, there will be a mathematical model simulation for four major friction of the hydraulic pump sea water through the MatLab . The simulation results of the design of water hydraulic pump has a certain significance.
10
Pietrzyk, Tobias, Markus Georgi, Sabine Schlittmeier, and Katharina Schmitz. "Psychoacoustic Evaluation of Hydraulic Pumps." Sustainability 13, no. 13 (June 30, 2021): 7320. http://dx.doi.org/10.3390/su13137320.
Full textAbstract:
In this study, sound measurements of an axial piston pump and an internal gear pump were performed and subjective pleasantness judgements were collected in listening tests (to analyze the subjective pleasantness), which could be seen as the inverse of the subjective annoyance of hydraulic drives. Pumps are the dominant sound source in hydraulic systems. The noise generation of displacement machines is subject of current research. However, in this research only the sound pressure level (SPL) was considered. Psychoacoustic metrics give new possibilities to analyze the sound of hydraulic drive technology and to improve the sound quality. For this purpose, instrumental measurements of the acoustic and psychoacoustic parameters are evaluated for both pump types. The recorded sounds are played back to the participants in listening tests. Participants evaluate them regarding the subjective pleasantness by means of paired comparison, which is an indirect scaling method. The dependence of the subjective pleasantness on speed and pressure was analyzed for both pump types. Different regression analyses were carried out to predict the subjectively perceived pleasantness or annoyance of the pumps. Results show that a lower speed is the decisive operating parameter for reducing both the SPL and the annoyance of a hydraulic pump.
11
Banaszek, Andrzej, Radovan Petrović, Maja Andjelković, and Milan Radosavljević. "Efficiency of a Twin-Two-Pump Hydraulic Power Pack with Pumps Equipped in Constant Pressure Regulators with Different Linear Performance Characteristics." Energies 15, no. 21 (October 31, 2022): 8100. http://dx.doi.org/10.3390/en15218100.
Full textAbstract:
The efficiency problem of hydraulic pump units with advanced double structures with constant pressure regulators with different linear characteristics in the case of work in an open supply system is presented in the paper. The main parts of the hydraulic power pack structure and pressure controller functions are described. The equation is given for the calculation of energy losses in particular pumps and the whole multi-pump power pack unit. The difference between the efficiency of particular pumps and the hydraulic pump unit was discussed.
12
Anh, Phuc Nguyen, Jae-Sung Bae, and Jai-Hyuk Hwang. "Computational Fluid Dynamic Analysis of Flow Rate Performance of a Small Piezoelectric-Hydraulic Pump." Applied Sciences 11, no. 11 (May 26, 2021): 4888. http://dx.doi.org/10.3390/app11114888.
Full textAbstract:
This paper investigates the transient flow rate performance of small piezoelectric-hydraulic pumps. In a previous study, a small piezoelectric hydraulic pump was designed and developed to be applicable to the braking systems of small- and medium-sized UAVs (unmanned aerial vehicles). To this end, a thin plate spring check valve was designed in order to effectively discharge the flow in a single direction. The flow rate of the piezoelectric-hydraulic pump is an important criterion for evaluating pump efficiency. Therefore, a study on the parameters affecting such a flow rate is necessary to enhance the efficiency of piezoelectric hydraulic pumps used in brake systems. This study on small piezoelectric-hydraulic pumps is performed to accurately predict the flow rate using a CFD (Computational Fluid Dynamics) tool. In other words, an unsteady CFD method is applied to model the transient flow rate characteristics and the internal flow field of the fluid. The visualization of the internal flow field is evaluated for a better understanding of the flow fields inside the pump. Moreover, this work also illustrates the detailed motion of both the inlet and outlet check valves during the pump operation that fully reflects the phase shift between the check valves and the piston motion, all of which affect the flow rate performance of the pump. An experiment of flow rate characteristics was conducted on a designed piezoelectric-hydraulic pump, which verifies the validity of the CFD results.
13
Long, Ming, Ai Min Hu, Zhi Gang Gao, and Xian Jian He. "Velocity and Load Characteristics Analysis of Pump-Control-Motor Hydraulic Drive System." Advanced Materials Research 139-141 (October 2010): 947–51. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.947.
Full textAbstract:
Pump-control-motor hydraulic drive system is a common used volume speed-modulating loop in hydraulic control system. Aiming at the working conditions of the cutter head of the tunnel excavator used in the large underground excavation, a pump-control-motor hydraulic drive system was applied that composed of three variable displacement hydraulic pumps and eight hydraulic motors, which can control the rotate speed of the cutter head in real time. The simulation model of the pump-control-motor was established using the AMESim software. The relationships among the rotate speed, torque of the cutter head and the system pressure, system flow were investigated in detail under several typical working conditions in tunneling. The relevant results can provide theory references for design of pump-control-motor hydraulic control system in other occasions.
14
Tian, Ye, Chen Lu, and Zi Li Wang. "Approach for Hydraulic Pump Fault Diagnosis Based on WPT-SVD and SVM." Applied Mechanics and Materials 764-765 (May 2015): 191–97. http://dx.doi.org/10.4028/www.scientific.net/amm.764-765.191.
Full textAbstract:
As the failure of a hydraulic pump is always instantaneous, the failure data are difficult to obtain. High-efficiency fault diagnosis under small-sample conditions for hydraulic pumps is urgently required in engineering applications. A fault diagnosis approach based on wavelet packet transform (WPT), singular value decomposition (SVD), and support vector machine (SVM) is proposed in this study. First, the nonlinear, non-stationary vibration signal of the hydraulic pump is decomposed into components by WPT. Second, singular value vectors are acquired as feature vectors by applying SVD to the components. Third, the health states of the hydraulic pumps are determined and classified with a SVM classifier. Furthermore, the SVM and Elman neural network classifiers are compared in terms of fault classification to demonstrate the superiority of SVM in dealing with small-sample problems. The results of the plunger pump rig test show that the proposed method can diagnose the faults of the hydraulic pump accurately even when the number of samples is small.
15
Li, Ruichuan, Jilu Liu, Xinkai Ding, and Qi Liu. "Study on the Influence of Flow Distribution Structure of Piston Pump on the Output of Pulsation Pump." Processes 10, no. 6 (May 27, 2022): 1077. http://dx.doi.org/10.3390/pr10061077.
Full textAbstract:
According to the working principle of the A10VNO swashplate axial piston pump, the output flow model of an axial piston pump in an ideal state and the output flow theoretical model of an axial piston pump considering the leakage and flow distribution process are established. The output flow pulsations of odd and even piston pumps are simulated and analyzed by Matlab, and the influence of a closed dead angle and a mismatch angle of the port plate on the output flow pulsation of the pump is obtained. Based on the theoretical model, AMESim is used to establish the overall model of the axial piston pump considering leakage, flow distribution process and oil compressibility under constant working conditions. By setting six different flow distribution boundary conditions corresponding to the theoretical research, the influence of flow distribution plate structure on pump output flow pulsation is studied. A test-bed was built and verified by experiments. The results show that when the mismatch angle of the valve plate is 3–5° and the dead angle is 6–10°, the difference between the output flow pulsations of the odd and even piston pumps is very small, so in the hydraulic pump hydraulic motor system, when the hydraulic pump is used as a hydraulic motor under the condition of power recovery, the odd number or adjacent even number of hydraulic motors are appropriate.
16
Wang, Cheng Long, Qing Liang Zeng, Guang Yu Zhou, and Sheng Gang Zhao. "Design and Realization of Automatic Testing System for Hydraulic Pump." Advanced Materials Research 189-193 (February 2011): 2727–30. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.2727.
Full textAbstract:
Based on the application analysis of hydraulic pump CAT test-bench, an automatic testing system of hydraulic pump CAT test-bench combined with technology of measurement and control was raised, including the detailed introduction of its work principle, components and software. By this testing system, tests of hydraulic pumps were realized automatically, accurately and efficiently.
17
Majdan, Radoslav, Zdenko Tkáč, Rudolf Abrahám, Bohuslav Stančík, Milena Kureková, and Radoslav Paulenka. "Effect of Ecological Oils on the Quality of Materials of Hydraulic Pump Components." Advanced Materials Research 801 (September 2013): 1–6. http://dx.doi.org/10.4028/www.scientific.net/amr.801.1.
Full textAbstract:
This paper presents the effect of three oil types on the quality of hydraulic pumps after testing on a special test bench. The quality of material of hydraulic pump components was evaluated on the basis of its wear. In the special test bench, hydraulic pumps were loaded by cyclic pressure with different oil types. There were tested a mineral oil-based liquid HV and two biodegradable types, i.e. a vegetable oil-based liquid HETG and polyalphaolefin oil-based liquid HEPR. The wear level of hydraulic pumps was evaluated on the basis of flow efficiency and the weight and roughness of internal components. Laboratory scales were used to measure the weight of hydraulic pump components. Results of measured roughness and weights have been graphically compared. We noticed the most significant material wear on bearings and slide plates. The highest loss of weight was observed in the hydraulic pump tested with the ecological oil HETG. The highest loss of flow efficiency (7.3 %) was measured with the same oil type. This paper shows differences in the wear of hydraulic pumps after testing with different types of oils on the basis of selected methods of technical diagnostics.
18
Biederstadt, K. C. "HYDRAULIC JET PUMPING AT TINTABURRA OILFIELD." APPEA Journal 28, no. 1 (1988): 19. http://dx.doi.org/10.1071/aj87002.
Full textAbstract:
The Hutton zone of the Tintaburra oilfield has an active bottom water drive which necessitates high gross fluid production rates to enable reserves to be produced within a reasonable period of time. A high volume artificial lift system capable of producing 8 000 to 10 000 barrels of fluid per day (BFPD) from 6 producing wells formed the basic design criteria, and hydraulic jet pumping was chosen as the means of artificial lift. The hydraulic jet pumping installation at Tintaburra was the first of its kind in Australia.The basic principle of operation of a jet pump is the transfer of momentum from a power fluid to reservoir fluid. The power fluid is pumped through a nozzle and the corresponding increase in velocity results in a pressure drop at the nozzle exit. This drop in pressure provides the drawdown necessary to move reservoir fluid to the pump where it is entrained and mixed with the power fluid. The combined stream is produced to surface and handled using convential production techniques. Equipment required in the Tintaburra system consists of a power fluid settling and storage tank, surface power fluid pump, distribution manifold, wellhead control valves and the subsurface assembly, including the jet pump itself.The application of mathematical equations describing jet pump operation was used in the initial selection of pumps for the Tintaburra wells. While this method provides insight into the operation of jet pumps, the use of equipment supplier's software proved to be more expedient in the final design stages and allowed many nozzle and throat combinations to be evaluated. Changes to well productivity brought about by the installation of down hole equipment required new pump selections for all wells. After nine months of operation, comprehensive production testing again highlighted changes to well productivity, necessitating variations in operating parameters or, in some cases, specification of new pumps.
19
Young, B. W. "Design of Hydraulic Ram Pump Systems." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 209, no. 4 (November 1995): 313–22. http://dx.doi.org/10.1243/pime_proc_1995_209_010_01.
Full textAbstract:
Automatic hydraulic ram pumps are environmentally friendly devices using a renewable energy resource to pump water for domestic or agricultural use. Since being superseded by pumps using electrical or fossil fuel energy nearly a century ago, they are now coming back into favour in many parts of the developing world. In the past, hydraulic ram pumps have been designed by rules-of-thumb having limited scientific basis. On-site adjustment has been used in the hope of rectifying the inevitable shortcomings of this process and ideal performance is rarely achieved. The present proposal for optimum design allows relevant system parameters (including the beat frequency) to be selected prior to installation. The paper shows how a ram pump system may be designed using two simple equations containing empirical factors dependent upon ram size, delivery head, material and wall thickness of the drive pipe and the configuration of the impulse valve. The design method is illustrated with reference to a number of existing tests. New experimental results for a 53 mm ram with five different impulse valve strokes are also presented.
20
Inaguma, Yoshiharu. "Oil temperature influence on friction torque characteristics in hydraulic pumps." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 9 (December 1, 2011): 2267–80. http://dx.doi.org/10.1177/0954406211430572.
Full textAbstract:
This article presents a practical approach to the investigation of the influence of oil temperature on the friction torque in various types of hydraulic pumps using a mathematical model. Currently, an external gear, an internal gear or a vane pump is commonly used for an automatic transmission. These pumps have their own friction torque characteristics, which depend not only on pump-operating conditions such as operating pressures, pump speeds and oil temperature but also on structures and dimensions of the pumps. For various pumps, however, the friction torque characteristics can be represented by an identical mathematical model. In the pump-operating conditions, the oil temperature significantly and complicatedly affects them. The pump should be operated under conditions to obtain a higher mechanical efficiency, and the mathematical model is helpful to analyse how the oil temperature influences the friction torque. It is found that with an increase in oil temperature, the friction torque at a high pump speed decreases in a low oil temperature region, but it would not decrease in a high oil temperature region for all the tested pumps. This fact suggests that the pump overall efficiency would not improve at a high oil temperature, even if the volumetric efficiency does not go down.
21
Liang, Gao Feng, and Qiang Gao. "Multistage Self-Priming Pump Performance Simulation & Test Research." Applied Mechanics and Materials 651-653 (September 2014): 780–83. http://dx.doi.org/10.4028/www.scientific.net/amm.651-653.780.
Full textAbstract:
Currently the application of traditional centrifugal pump design theory to develop the multi-stage centrifugal pumps is very mature, but the factor of affecting hydraulic performance of centrifugal self-priming pump is still unclear. In this paper, using CFD method to simulate the hydraulic performance of the multistage self-priming pump in different operating conditions, and get the performance prediction curve. The simulation results were compared with experimental data, the result shows that simulation method can accurately predict the performance and internal flow characteristics of multi-stage self-priming pump. The impact on the hydraulic performance by water-keeper chamber and the gas-liquid separation chamber is very limited. The self-priming components can provide a better hydraulic performance. This will be as a reference for the design of self-priming pump.
22
Ali Hikmat Akhmadov, Mehman Omarov, Ali Hikmat Akhmadov, Mehman Omarov. "СOMPARATIVE STUDY OF CENTRIFUGAL PUMP." ETM - Equipment, Technologies, Materials 11, no. 03 (May 23, 2022): 70–74. http://dx.doi.org/10.36962/etm11032022-70.
Full textAbstract:
In this study, a centrifugal pump was analyzed to examine the effect of the use of inductors on its performance. Tests have been carried out to obtain optimal hydraulic performance before and after using the inductor. We used two types of inductors (axial inductors, screw inductors). For this, a test setup with a pumping system was specially designed to investigate the parameters under consideration. In this study, a simulation of the performance of a centrifugal pump in combination with inductors using CFD is presented for comparison with experimentally observed values. The model explores the effect of using inductors on pump head and flow. The results of the CFD model and experiment correlate well. In addition, the results assist pump decision makers in future developments in pump performance by ensuring that the pumps are in a safe and reliable operating condition. It can also be used for a wide variety of high head and flow pump applications. Keywords: hydraulics, Centrifugal pump, reliability, pumps, devices, system.
23
Gao, Bo, Min Guan Yang, Xin Kai Sun, and Ning Zhang. "Structural and Hydraulic Design of Mechanical Pump Using in LBE Test Loop." Advanced Materials Research 588-589 (November 2012): 190–93. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.190.
Full textAbstract:
In order to design a mechanical pump that can satisfy the special requirements of the LBE test loop, structural and hydraulic design ideas were discussed in this paper. A new vertical centrifugal submerged pump was proposed, including installation and hydraulic model. Based on the provided parameter, hydraulic design of the pump has been done by CFD method. Velocity caused erosion problem was considered primarily in the design process. It is helpful for the future design of pumps in various loops and ADS.
24
Majdan, R., Z. Tkáč, J. Kosiba, R. Abrahám, J. Jablonický, Ľ. Hujo, and M. Mojžiš. "Evaluation of tractor biodegradable hydraulic fluids on the basis of hydraulic pump wear." Research in Agricultural Engineering 59, No. 3 (September 18, 2013): 75–82. http://dx.doi.org/10.17221/18/2012-rae.
Full textAbstract:
Two types of biodegradable hydraulic fluids (HEES and HEPR) with the mineral oil-based hydraulic fluid (HV) were compared. The tests were performed using a test bench. During the tests with a tractor hydraulic pump, the fluids were loaded by a cyclic pressure load. The tests of fluids were evaluated on the basis of wear of the pump. Evaluation parameters were the flow characteristics of the pump and the cleanliness level of tested fluids. The temperature of the fluid under which the test was performed was measured in real operating conditions of the Zetor Forterra 11441 tractor. It is possible to state upon the test results that the mineral oil-based fluid was classified in the first place, the biodegradable fluid of the HEPR type in the second place, and the biodegradable fluid of the HEES type received the last position.
25
Rakhimov, Оktyabr, Laylo Аshurova, and Fotima Artikbekova. "Hydraulic transport in small livestock farms." E3S Web of Conferences 274 (2021): 03003. http://dx.doi.org/10.1051/e3sconf/202127403003.
Full textAbstract:
The article highlights the advantages and benefits of pipeline transport of liquid feed mixtures on small pig farms, the device and the principle of operation and technical characteristics of the improved rotor pump developed by the authors of the article. Methods of experimental research to determine the concentration of feed mixtures, the influence of the shape of the separator on the performance characteristics, the required power and the flow of an improved pump are presented. The results of the experiments showed that one of the bottlenecks limiting the operation of rotary pumps on feed mixtures of increased concentration is the low suction capacity of the pump, that is, the design of the suction pipe of the pump, where an increase in resistance with an increase in the concentration of feed mixtures causes a breakdown of the operating mode and cavitation. To resolve this issue, we used a screw feeder installed in front of the pump suction nozzles. It was found that if the screw feeder provides excess pressure within (about, 0.25 ... 0.3) 105 Pa per suction cavity, the pump operates stably and reliably.
26
Sieβ, T., H. Reul, and G. Rau. "Hydraulic Refinement of An Intraarterial Microaxial Blood Pump." International Journal of Artificial Organs 18, no. 5 (May 1995): 273–85. http://dx.doi.org/10.1177/039139889501800506.
Full textAbstract:
Intravascularly operating microaxial pumps have been introduced clinically proving to be useful tools for cardiac assist (1–4). However, a number of complications have been reported in literature associated with the extra-corporeal motor and the flexible drive shaft cable (5,6). In this paper, a new pump concept is presented which has been mechanically and hydraulically refined during the developing process. The drive shaft cable has been replaced by a proximally integrated micro electric motor and an extra-corporeal power supply (7). The conduit between pump and power supply consists of only an electrical power cable within the catheter resulting in a device which is indifferent to kinking and small curvature radii. Anticipated insertion difficulties, as a result of a large outer pump diameter, led to a two-step approach with an initial 6,4mm pump version and a secondary 5,4mm version. Both pumps meet the hydraulic requirement of at least 2.5I/min at a differential pressure of 80–100mmHg. The hydraulic refinements necessary to achieve the anticipated goal are based on ongoing hydrodynamic studies of the flow inside the pumps. Flow visualization on a 10:1 scale model as well as on 1:1 scale pumps have yielded significant improvements in the overall hydraulic performance of the pumps. One example of this iterative developing process by means of geometrical changes on the basis of flow visualization is illustrated for the 6.4mm pump.
27
Suherman, Andi, La Hasanudin, and Prinob Aksar. "Rancang Bangun Pompa Hidram Untuk Kebutuhan Air Pada Daratan Tinggi Dengan Memanfaatkan Arus Aliran Air Sungai." Enthalpy : Jurnal Ilmiah Mahasiswa Teknik Mesin 7, no. 2 (May 31, 2022): 81. http://dx.doi.org/10.55679/enthalpy.v7i2.24894.
Full textAbstract:
In rural areas, water supply is needed for agricultural, livestock, and fishery activities. In this problem a pump with the right technology, efficiency, and economy is needed so that its management does not depend on fuel and electricity. As a solution to this problem is the use of a hydraulic ram pump. Hydram pumps are an alternative in distributing water from low places to high places. This study aims to design a hydraulic ram pump at Cemping Ground. In this study, the main system is a hydraulic ram pump (hdyram pump) which can drain water from a low place to a high place without using electricity. The flow capacity produced by this pump at a height of 5 meters is 0,000057 (m3/s) or 0,057 (liter/s), the flow rate produced by this tool is 0,00072 (m/s), the efficiency of the hydraulic ram pump produced is 75,83 %, it takes 58,26 minutes per day to meet the 200 L water requirement, for the stress that occurs in the pipe is 0,0554 N/mm2 and for the strain that occurs in the pipe is 0,0000185.Keywords: Alternative, Tool, Design, Pump, Hydraulic
28
Gao, Qiang, He-Sheng Tang, Jia-Wei Xiang, and Yongteng Zhong. "A multi-sensor fault detection strategy for axial piston pump using the Walsh transform method." International Journal of Distributed Sensor Networks 14, no. 4 (April 2018): 155014771877253. http://dx.doi.org/10.1177/1550147718772531.
Full textAbstract:
The axial piston pump is a key component of the industrial hydraulic system, and the failure of pump can result in costly downtime. Efficient fault detection is very important for improving reliability and performance of axial piston pumps. Most existing diagnosis methods only use one kind of the discharge pressure, vibration, or acoustic signal. However, the hydraulic pump is a typical mechanism–hydraulics coupling system, all of the pressure, vibration, and acoustic signals contain useful information. Therefore, a novel multi-sensor fault detection strategy is developed to realize more effective diagnosis of axial piston pump. The presence of periodical impulses in these signals usually indicates the occurrence of faults in pump. Unfortunately, in the working condition, detecting the faults is a difficult job because they are rather weak and often interfered by heavy noise. Therefore, noise suppression is one of the most important procedures to detect the faults. In this article, a new denoising method based on the Walsh transform is proposed, and the innovation is that we use the median absolute deviation to estimate the noise threshold adaptively. Numerical simulations and experimental multi-sensor data collected from normal and faulty pumps are used to illustrate the feasibility of the proposed approach.
29
Ułanowicz, Leszek, Grzegorz Jastrzębski, Paweł Szczepaniak, Ryszard Sabak, and Dariusz Rykaczewski. "Malfunctions of Aviation Hydraulic Pumps." Journal of KONBiN 50, no. 3 (October 1, 2020): 257–76. http://dx.doi.org/10.2478/jok-2020-0061.
Full textAbstract:
AbstractHydraulic pumps are among the most complex and responsible units from the point of view of aircraft flight safety. One of the most important scientific and technical problems in improving the reliability of hydraulic pumps is to understand the physical nature of the cause of damage in them and on this basis to develop measures and recommendations to ensure their reliability. The article discusses the characteristics of hydraulic piston pairs of hydraulic pumps according to the kinematics of their movement and load conditions. Selected actual damages of axial piston pumps are discussed. The paper presents a simplified 3D solid model of the cylinder-piston assembly and the mechanism for adjusting the inclination of the piston cylinder block, the axial hydraulic pump, and the model of breaking loads for selected elements of this pump. The digital solid model and element load analysis were developed in SolidWorks Simulation.
30
Yu, Zheqin, Jianping Tan, and Shuai Wang. "Multi-parameter analysis of the effects on hydraulic performance and hemolysis of blood pump splitter blades." Advances in Mechanical Engineering 12, no. 5 (May 2020): 168781402092129. http://dx.doi.org/10.1177/1687814020921299.
Full textAbstract:
The splitter blade can effectively optimize pump performance, but there is still insufficient research in blood pumps that cover both hydraulic and hemolysis performance. Thus, the aim of this study was to investigate the effect of key factors related to splitter blade on the performance and flow field of axial flow blood pump. In this study, the number of splitter blades, the axial length, and the circumferential offset were chosen as three objects of study. An analysis of the flow field and performance of the pump by orthogonal array design using computational fluid mechanics was carried out. A set of hydraulic and particle image velocimetry experiments of the model pumps were performed. The result showed that the pump had greater hydraulic performance without sacrificing its hemolytic performance when it had two splitter blades, the axial length ratio was 0.6, and the circumferential offset was 15°. Based on these reference data, the splitter blade may contribute to greater hydraulic performance of the pump and cause no side effect on the velocity distribution of the flow field. This finding provides an effective method for the research, development, and application of structural improvement of the axial flow blood pump.
31
Birajdar, Ravindra S., Appasaheb A. Keste, and Shravan H. Gawande. "Critical Hydraulic Eccentricity Estimation in Vertical Turbine Pump Impeller to Control Vibration." International Journal of Rotating Machinery 2021 (July 31, 2021): 1–11. http://dx.doi.org/10.1155/2021/6643282.
Full textAbstract:
In many applications, pumps are tested against standard specifications to define the maximum allowable vibration amplitude limits of a pump. It is essential to identify the causes of vibration and methods to attenuate the same to ensure the safe and satisfactory operation of a pump. Causes of vibration can be classified mainly into mechanical and hydraulic nature. Respective unbalance masses are the two major factors which cause dynamic effects and excitation forces leading to undesirable vibrations. In this paper, the procedure of vibration magnitude measurement of a vertical turbine pump at site and the process of dynamic balancing to measure mechanical unbalance of an impeller are explained. After that, the impact of hydraulic eccentricity on the vibration displacement of a vertical turbine pump has been explained using numerical simulation procedure based on “One-way Fluid Structure Interaction (FSI).” The experimental results from a pump at site are used to compare the numerical results. After the solver validation, the one-way FSI approach is used to find the critical hydraulic eccentricity magnitude of a vertical turbine pump impeller to limit the vibration magnitudes on motor component to less than 100 μm. From the numerical simulations, it is deduced that the critical hydraulic eccentricity should be limited to 400 μm in X and Y direction. The process can be used as a guideline procedure for limiting the hydraulic unbalance in vertical turbine pumps by limiting the hydraulic eccentricity.
32
Li, Zhenbao, Wanlu Jiang, Sheng Zhang, Yu Sun, and Shuqing Zhang. "A Hydraulic Pump Fault Diagnosis Method Based on the Modified Ensemble Empirical Mode Decomposition and Wavelet Kernel Extreme Learning Machine Methods." Sensors 21, no. 8 (April 7, 2021): 2599. http://dx.doi.org/10.3390/s21082599.
Full textAbstract:
To address the problem that the faults in axial piston pumps are complex and difficult to effectively diagnose, an integrated hydraulic pump fault diagnosis method based on the modified ensemble empirical mode decomposition (MEEMD), autoregressive (AR) spectrum energy, and wavelet kernel extreme learning machine (WKELM) methods is presented in this paper. First, the non-linear and non-stationary hydraulic pump vibration signals are decomposed into several intrinsic mode function (IMF) components by the MEEMD method. Next, AR spectrum analysis is performed for each IMF component, in order to extract the AR spectrum energy of each component as fault characteristics. Then, a hydraulic pump fault diagnosis model based on WKELM is built, in order to extract the features and diagnose faults of hydraulic pump vibration signals, for which the recognition accuracy reached 100%. Finally, the fault diagnosis effect of the hydraulic pump fault diagnosis method proposed in this paper is compared with BP neural network, support vector machine (SVM), and extreme learning machine (ELM) methods. The hydraulic pump fault diagnosis method presented in this paper can diagnose faults of single slipper wear, single slipper loosing and center spring wear type with 100% accuracy, and the fault diagnosis time is only 0.002 s. The results demonstrate that the integrated hydraulic pump fault diagnosis method based on MEEMD, AR spectrum, and WKELM methods has higher fault recognition accuracy and faster speed than existing alternatives.
33
Buriennikov, Yurii, Leonid Kozlov, Oana Rusu, Viktor Matviichuk, Volodymyr Pyliavets, Natalia Semychasnova, and Ioan Rusu. "OPTIMIZATION OF PARAMETERS OF THE MOBILE MACHINE ADAPTIVE HYDRAULIC CIRCUIT." International Journal of Modern Manufacturing Technologies 13, no. 3 (December 25, 2021): 14–21. http://dx.doi.org/10.54684/ijmmt.2021.13.3.14.
Full textAbstract:
Mobile machine hydraulic circuits tend to adopt electrohydraulics. Such hydraulic circuits are based on controlled pumps, modulated hydraulics, sensors and controllers. This allows adapting the hydraulic circuit operating modes to the changes of external conditions of the machine operation. Application of hydraulic circuits with electrohydraulics in mobile machines allows to use mobile machines efficiently with a high number of removable endangers, increases their performance and improves the quality of performed works. The authors propose an adaptive hydraulic circuit for a mobile machine. The operation process in the adaptive hydraulic circuit in static and dynamic modes is determined by the interaction of the pump controller and pressure differential control valves. The hydraulic system operation stability, its fast response and readjustment are determined by the controller parameters. It has been revealed that the main parameters affecting the dynamic characteristics of the hydraulic system are: throttle area and coefficient of amplifying the pump controller orifice, dampener area and coefficient of amplifying the pressure differential control valve orifice. These parameters affect the stability, controlling and readjustment time in the hydraulic circuit differently. A functional including the values of controlling time , σ controlling and losses in the pump controller was used as an optimization criterion. The optimization has been made according to the developed mathematical model applying the method developed by I. Sobol and R. Statnikov. During the optimization each controller parameter changed on 3 levels. 81 tests were made and the best combination of controller parameters for the optimization criterion was determined. The following hydraulic circuit operation values were reached under the optimal values of parameters = 1.0·10-6 m2, = 1.0·10-3 m, = 1.2·10-6 m2, = 10·10-3 m: = 1.1 с, σ = 32 %, = 0.82 kW that comply with the requirements towards hydraulic circuits of mobile machines.
34
Ding, Hong. "Application of Non-Circular Planetary Gear Mechanism in the Gear Pump." Advanced Materials Research 591-593 (November 2012): 2139–42. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.2139.
Full textAbstract:
Gear pump is the most commonly used hydraulic component in hydraulic drive system.Volumetric efficiency of the traditional gear pump is low, big flow ripple causes large pressure fluctuations, makes pipes and valves vibration, noisy. The imbalance pressure on gear pump’s gears, shafts and bearings and the large radial load limits its pressure increased. Planetary gear transmission compared with ordinary gear transmission, it has many unique advantages. So the writer on the basis of the combination of proposed non-circular planetary gear pumps and gear pump works discussed the structure and working principle of the pump. The non-circular planetary gear pump with many advantages such as big flow, uniform flow, low noise and so on. It can be widely used in various hydraulic transmission systems.
35
Guo, Rui, Yongtao Li, Yue Shi, Hucheng Li, Jingyi Zhao, and Dianrong Gao. "Research on Identification Method of Wear Degradation of External Gear Pump Based on Flow Field Analysis." Sensors 20, no. 14 (July 21, 2020): 4058. http://dx.doi.org/10.3390/s20144058.
Full textAbstract:
As a kind of hydraulic power component, the external gear pump determines the performance of the entire hydraulic system. The degradation state of gear pumps can be monitored by sensors. Based on the accelerated life test (ALT), this paper proposes a method to identify the wear degradation state of external gear pumps based on flow field analysis. Firstly, the external gear pump is theoretically analyzed. Secondly, dynamic grid technology is used to simulate the internal flow field of the gear pump in detail. Finally, the theoretical and simulation results are verified by the ALT. The results show that this method can effectively identify the wear degradation status of four sample pumps. The results of the work not only provide a solution to the research on the wear degradation of external gear pumps, but also provide strong technical support for the predictive maintenance of hydraulic pumps.
36
Esen, I. I. "Experimental Investigation of a Rectangular Airlift Pump." Advances in Civil Engineering 2010 (2010): 1–5. http://dx.doi.org/10.1155/2010/789547.
Full textAbstract:
Hydraulic performance of an airlift pump having a rectangular cross-section 20 mm × 80 mm was investigated through an experimental program. The pump was operated at six different submergence ratios and the liquid flow rate was measured at various flowrates of air injected. The effectiveness of the pump, defined as the ratio of the mass of liquid pumped to the mass of air injected, was determined as a function of the mass of air injected for different submergence ratios. Results obtained were compared with those for circular airlift pumps using an analytical model for circular pumps. Effectiveness of the rectangular airlift pump was observed to be comparable to that of the circular pumps. Hydraulic performance of the rectangular airlift pump investigated was then described by a set of semilogarithmic empirical equations.
37
Masood, Khayyam, Xavier Dauptain, Matteo Zoppi, and Rezia Molfino. "Hydraulic Pressure-Flow Rate Control of a Pallet Handling Robot for an Autonomous Freight Delivery Vehicle." Electronics 9, no. 9 (August 24, 2020): 1370. http://dx.doi.org/10.3390/electronics9091370.
Full textAbstract:
The current paper presents an upgrade of a pre-installed hydraulic system for the operation of a pallet handling robot for a freight delivery vehicle known as FURBOT (freight urban robotic vehicle). The automated forklift installed on FURBOT for loading/unloading of cargo is powered with the help of hydraulics. The previous hydraulic system worked via a classical approach with a fixed displacement pump and a bypass valve, making it work on full power when in use. An alternative design was proposed, simulated and installed on FURBOT; it uses a fixed displacement pump and changes the rotation speed in real time using a pressure sensor. Novelty was attained with the use of gear pumps for said scenario. A control algorithm is implemented in the processing unit for controlling the speed of the motor driving the pump. The main advantage of this approach is better use of energy for the vehicle’s battery. The aim of this research is to control both the speed and maximum force exerted by the actuators with the help of a single sensor and an inexpensive pump.
38
Wang, Yuqin, Jian Luo, Shuai Liu, Zhibo Han, and Xiaoqiang Ni. "Hydraulic optimization design of centrifugal pumps aiming at low vibration noise." AIP Advances 12, no. 9 (September 1, 2022): 095026. http://dx.doi.org/10.1063/5.0111256.
Full textAbstract:
In order to reduce the vibration noise generated by the centrifugal pump in the working process and improve the working efficiency of the centrifugal pump, the sound field numerical calculation of IS80-65-160 single-stage single-suction centrifugal pump was carried out. Under the condition that the parameters of the pump body and the impeller remain unchanged, the number of blades of the prototype pump impeller was designed as 4, 5, 6, and 7, respectively. The flow-induced vibration and noise characteristics of centrifugal pumps were studied from two aspects of numerical simulation and test, and the renormalization group k-ε model was used to simulate the steady and unsteady state of centrifugal pumps with different blade numbers. The external characteristics, pressure pulsation characteristics, vibration, and noise of the centrifugal pump were obtained, and the flow-induced vibration and noise test platform of the centrifugal pump was built for experimental verification. The research showed that the flow induction in the model pump was the main factor affecting the vibration of the prototype pump, and the shaft frequency and blade frequency were the main reasons causing the noise of the prototype pump. The vibration of each blade was the most concentrated at onefold blade frequency, and the peak of the sound field acoustic pressure level of the pump body was higher than other frequencies at threefold blade frequency, which was most obvious in the tongue region of the volute. With the increase of blades, the noise in volute decreased. The vibration intensity of the 4-blade prototype pump was lower, but the efficiency and head were also lower. The vibration intensity of the 5-blade prototype pump was the highest, the comprehensive performance of the 6-blade prototype pump was better, and the vibration of the 7-blade prototype pump was unstable. The test results showed that six blades could effectively reduce the flow-induced vibration noise of centrifugal pumps and improve the working environment, which provided certain application value and guiding significance for the hydraulic design of the subsequent low-noise centrifugal pumps.
39
Wu, Di, Jin Yao, and Yong Jing Huang. "Study on the Speed Control System of Hydraulic Pump-Motor Based on PID Neural Network." Advanced Materials Research 542-543 (June 2012): 759–64. http://dx.doi.org/10.4028/www.scientific.net/amr.542-543.759.
Full textAbstract:
Theoretical models of hydraulic pump-motor and electro-hydraulic servo control systems of hydraulic pumps were established and the system transfer function was derived In view of bad dynamic property, small damp, long transient time, low precision, nonlinearity and etc existing in the speed control system of Hydraulic Pump-Motor, a controller based on PID Neural Network was designed. The simulation results showed that the PID Neural Network controller has better dynamic property, load disturbance adaptability , robustness and cranking ability than traditional PID controller.
40
Tkáč, Zdenko, Ján Kosiba, Ľubomír Hujo, Daniela Uhrinová, and Ivan Štulajter. "Hydraulic Laboratory Devices for Testing of Hydraulic Pumps." Advanced Materials Research 1059 (December 2014): 111–17. http://dx.doi.org/10.4028/www.scientific.net/amr.1059.111.
Full textAbstract:
Hydraulic pumps are the most important components of hydraulic circuits in agricultural tractors. Their durability is influenced by flow characteristics and thus the flow efficiency. This paper presents the laboratory test of an ecological synthetic hydraulic fluid of UTTO type. This fluid is currently under development. In terms of a decrease in hydraulic pump flow efficiency, laboratory tests of these fluids did not show negative effects of its application. It can be stated that after completion of laboratory tests, it will be needed to continue with trials under operational conditions.
41
Gao, Jun, Guo Yi Yan, Gen Yun Peng, and Guan Nan Xi. "Experiment Study on Performances of Servo Pump Used in Hydraulic Press Machine." Advanced Materials Research 516-517 (May 2012): 892–95. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.892.
Full textAbstract:
As we known, the energy efficiency of pump-control system is higher than valve-control system. So, using pump-control system to replace valve-control system has a positive meaning to improve the energy efficiency in hydraulic press machine. In order to research the performance of servo pump used in hydraulic press machines, the present study is conducted. First, a test bench for comparison of pump-control and valve-control system is established. In this test bench, the pump of former valve-control system and the servo pump are settled. These two pumps are switched by solenoid to supply oil for the hydraulic system. Then, host PC, target PC, I/O board and other hard-wares are connected. Soft-wares and the corresponding driver board are applied to collect data. In order to test the performances of the pressure, velocity and displacement under the condition of the valve-control system and pump-control system, the two systems are tested with the same working conditions. The performance of repeatability and energy efficiency are also obtained. The results show that it’s feasible to apply servo pump to hydraulic press machine. And under the pump-control condition, the velocity and pressure performance of press machine is more stable.
42
Shen, Kai, Wei Xiong, Quanbin Ba, Yin Liao, and Lipeng He. "Research on Parallel Operation Characteristics of High-pressure Pumps Applied in Coal Mine Hydraulics permeability improvement." Journal of Physics: Conference Series 2029, no. 1 (September 1, 2021): 012030. http://dx.doi.org/10.1088/1742-6596/2029/1/012030.
Full textAbstract:
Abstract Nowadays, plunger high-pressure water pumps applied in large-scale mine are mostly used in coal mine hydraulics to increase permeability, and it is difficult to transport objections underground. Besides, the permeability improvement is affected during overhaul too. Therefore, multiple small high-pressure water pumps operating in parallel can be used to solve the problems mentioned above instead of large high-pressure water pumps. Moreover, the operating principle of the plunger high-pressure pump determines the specific flow fluctuation characteristics during its operation, and similar flow fluctuations also exist during the operating of parallel pump sets. The transmission model and AMESim hydraulic simulation model of single, parallel plunger pumps are established, taking the BQW-22/50 high-pressure water pump as an example. The operating characteristics of a single plunger pump and a parallel pump group are analyzed in this paper. The results are obtained as follows: the instantaneous discharge flow curve of a single plunger pump conforms to a sine function; the flow of the parallel pump set is the superposition of the flow of multiple plunger pumps; the instantaneous discharge flow curve changes under the influence of the phase deviation angle between the pumps; when parallel pump sets are running, there is an optimal phase deflection angle between the pumps, which minimizes the flow fluctuation of the pump sets; when four high-pressure water pumps are operated in parallel, the optimal phase deflection angle between the pumps is π/12 or π/4.
43
Backé, W. "ELECTRO-HYDRAULIC PUMP CONTROL." Proceedings of the JFPS International Symposium on Fluid Power 1989, no. 1 (1989): 79–86. http://dx.doi.org/10.5739/isfp.1989.79.
Full text
44
Mauck, Lisa D., and Christopher S. Lynch. "Piezoelectric Hydraulic Pump Development." Journal of Intelligent Materials Systems and Structures 11, no. 10 (October 1, 2000): 758–64. http://dx.doi.org/10.1177/104538900772663793.
Full text
45
Motomura, T., K. Watanabe, T. Asai, S. Ito, H. Sumikura, F. Ichihashi, T. Shinohara, et al. "HYDRAULIC SUSPENSION GYRO PUMP." ASAIO Journal 49, no. 2 (March 2003): 177. http://dx.doi.org/10.1097/00002480-200303000-00148.
Full text
46
Mauck, Lisa D., and Christopher S. Lynch. "Piezoelectric Hydraulic Pump Development." Journal of Intelligent Material Systems and Structures 11, no. 10 (October 2000): 758–64. http://dx.doi.org/10.1106/hc2a-abr9-21h8-2tjb.
Full text
47
Maksimov, Y. V., V. K. Sokovikov, A. A. Bekaev, and P. I. Strokov. "The fuel pump of a new generation." Izvestiya MGTU MAMI 6, no. 2-1 (January 20, 2012): 241–45. http://dx.doi.org/10.17816/2074-0530-68511.
Full textAbstract:
Bekaev@list.ru Based on the electrohydraulic effect, also known as the “Yutkin effect”, the authors developed a brand new design of an electro-hydraulic fuel pump of high pressure, providing performance superior (for pressure and flow rate) than modern high pressure fuel pumps of internal combustion engines. Application of the developed electro-hydraulic pump for internal combustion engines will completely eliminate the use of a mechanized actuator, an integral part of modern fuel pumps, and thus greatly simplify the design and operation of fuel system, reduce its metal content, cost and noise.
48
Todić, Nenad, Slobodan Savić, Dušan Gordić, and Radovan Petrović. "Experimental Research of the Hydrodynamic Processes of an Axial Piston Water Hydraulic Pump." Machines 10, no. 9 (August 26, 2022): 728. http://dx.doi.org/10.3390/machines10090728.
Full textAbstract:
Water hydraulic components and systems play pivotal roles in the development of modern hydraulics. Sustainable development and environmental protection cannot be imagined without the use of water as a working medium in modern hydraulic systems. An axial piston pump is the main component of these systems. This paper presents analytical and experimental methods for the development of an axial piston pump. The presented mathematical model is rooted in numerous research results in the literature and in our own experience. It is based on mathematical modelling of hydrodynamic processes of a water hydraulic axial piston pump which, combined with experimental research, provides a great tool to analyse the influence of different factors on the operating process and to optimise the pump parameters. The experimental equipment used in our tests simulates a real hydraulic installation, and the obtained results are very close to the actual operating parameters. This research included a modification of the swash plate in order to achieve ideal operating parameters and, thus, extend the service life of the pump. Water has a number of advantages over conventional hydraulic oils. It is a sustainable, environmentally friendly resource, more readily available than oil (lower transportation costs), cheaper to dispose of, non-flammable and non-toxic, and its high thermal conductivity aids in cooling.
49
Liu, Y. S., D. F. Wu, L. Long, and S. P. Cao. "Research on the port valve of a water hydraulic axial pump." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 223, no. 3 (April 24, 2009): 155–66. http://dx.doi.org/10.1243/09544089jpme237.
Full textAbstract:
Water hydraulics using water as the working media is paid more attention because of its many advantages compared with oil ones. Water hydraulic pump is the key component in the applications of water hydraulics. Compared with the water hydraulic pump with port plate, the one with port valve has stronger anti-pollution ability and is more suitable for the open system where the working media cannot be filtered finely. For this kind of pump, the characteristics of port valve have direct and significant influences on the flow and pressure characteristics of the pump. In this article, the flow and pressure characteristics of different valves were compared experimentally and a disc valve was selected as the port valve. Then the mathematical model of a single-piston pump with port valve was built and the influences of different factors including spring rigidity, working pressure, etc. on the port valve were analysed. At last, a single-piston pump was developed to test the characteristics of the port valve. Based on these researches, some principles that should be abided in the design of the port valve were suggested.
50
Liu, Lei, Fang Qun Wang, Qin Lin Wu, Wen Jue Wu, Kun Xi Qian, Jing Hua Ji, Wen Xiang Zhao, Wei Xing He, and Tian Bo Li. "Influence of Impeller Design on Hemolysis of an Axial Blood Pump." Applied Mechanics and Materials 140 (November 2011): 162–66. http://dx.doi.org/10.4028/www.scientific.net/amm.140.162.
Full textAbstract:
Compared to centrifugal blood pumps, the high rotating speed of axial blood pumps lead to blood damage more easily. In order to improve blood compatibility of the axial blood pump developed by the authors, traditional method and three-dimensional streamlined method are used for axial impeller design, and rapid prototyping with ABS organic materials are adopted. Finally, hydraulic experiments and hemolysis tests have been conducted. The results reveal that the impeller design and the design parameters (diameter and length) affect the hydraulic performance and hemolysis of the axial pump obviously. The hemolysis index in axial flow impeller pump using traditional method is 0.12, while the minimum value of hemolysis index in the streamlined axial blood pump is 0.06, below the permitted hemolysis value of 0.1.