Relevant bibliographies by topics / Axial piston pump

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Axial piston pump'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Axial piston pump"

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Li, Ying, Xing Chen, Hao Luo, and Jin Zhang. "An Empirical Model for the Churning Losses Prediction of Fluid Flow Analysis in Axial Piston Pumps." Micromachines 12, no. 4 (April 3, 2021): 398. http://dx.doi.org/10.3390/mi12040398.

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The manufacturing development of axial piston pumps usually takes the trend of high speed and miniaturization, and increases power density. Axial piston pumps are usually characterized as high speed to improve the power density; thus, high-speed churning losses caused by the internal rotating components stirring the oil can increase significantly. In order to improve the efficiency, more attention should be given to the churning losses in axial piston pumps, especially in high-speed conditions. Using the method of least-squares curve fitting, this paper establishes a series of formulas based on the churning losses test rig over a wide range of speeds, which enable accurate predictions of churning losses on the cylinder block and pistons. The reduction coefficient of flow resistance of multi-pistons as calculated. The new churning losses formula devoted to the cylinder block and rotating pistons was validated by comparison with experimental evidence in different geometries of axial piston pumps. According to the prediction model of churning losses, some valuable guidance methods are proposed to reduce the energy losses of the axial piston pump, which are the theoretical support for the miniaturization of axial piston pump manufacturing.
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Manring, Noah D. "The Discharge Flow Ripple of an Axial-Piston Swash-Plate Type Hydrostatic Pump." Journal of Dynamic Systems, Measurement, and Control 122, no. 2 (May 6, 1998): 263–68. http://dx.doi.org/10.1115/1.482452.

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This research examines the idealized and actual flow-ripple of an axial-piston swash-plate type hydrostatic pump. For the idealized case, a “perfect” pump is examined in which the leakage is considered to be zero and the fluid is considered to be incompressible. Based upon these assumptions, closed-form expressions which describe the characteristics of the idealized flow-ripple are derived. Both the ripple height and the pulse frequency of the ripple are described for a pump with an even and an odd number of pistons. Next, the actual flow-ripple of the pump is examined by considering the pump leakage and the fluid compressibility and for computing these results a numerical program is used. For both the idealized case and the actual case a comparison is made between a nine-piston, an eight-piston, and a seven-piston pump. From the idealized analysis it is quantitatively shown that the eight-piston design is less attractive than the nine or seven-piston design; however, the analysis of the actual pump flow reveals that the qualitative difference between all three designs may not be too significant. From a flow ripple point of view, the numerical results of this research show that a pump designed with an even number of pistons may be as feasible as one that is designed with an odd number of pistons. This is an unexpected conclusion. [S0022-0434(00)00202-1]
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Harris, R. M., K. A. Edge, and D. G. Tilley. "The Suction Dynamics of Positive Displacement Axial Piston Pumps." Journal of Dynamic Systems, Measurement, and Control 116, no. 2 (June 1, 1994): 281–87. http://dx.doi.org/10.1115/1.2899221.

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The suction dynamics of axial piston pumps become more critical if the pump is to be used at high speeds. In order to prevent air-release and cavitation from occurring within the pump it is necessary to pressurise the pump inlet. As the speed of a pump is increased, higher boost pressures are required, due to the extra losses incurred through the suction line and portplate at the higher flowrates. However, the lack of data regarding axial piston pump behavior at high speeds creates problems for the system designer in selecting suitable boost conditions and for the pump designer in selecting the portplate configuration that is required to reduce fluid-borne-noise levels. This paper discusses the suction performance of piston pumps, and presents experimental and simulation results exploring the behavior of a high-speed axial-piston pump. Different air-release and cavitation models that are suitable for simulation studies are investigated.
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Wei, Xiu Ye, and Hai Yan Wang. "Dynamics Simulation Study of the Axial Piston Pump." Advanced Materials Research 706-708 (June 2013): 1323–26. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.1323.

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Kinematics analysis based on the structure parameters of SCY14-1B type axial piston pump is taken in this paper, and the motion laws of the pistons relative to the cylinder block and the swash plate are got. A matlab simulation of the motion law is taken and the comparison between theoretical analysis and simulated results is very good. We get the following conclusions: The displacement, velocity and acceleration of the motion of the piston relative to the swash plate is simple harmonic.The motion trajectory of the piston relative to the swash plate is an ellipse. The swash plate angle has a significant effect on the motion of the piston, which will inevitably affect the instantaneous flow rate of the pump and flow pulsation coefficient.
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Sun, Yuan Jing, and Lei Wang. "Parametric Design of Axial Piston Pump Based on Secondary Development of Pro/Toolkit." Advanced Materials Research 569 (September 2012): 737–40. http://dx.doi.org/10.4028/www.scientific.net/amr.569.737.

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A parametric design system of axial piston pump was built, based on secondary development of Pro/Engineer, in Visual C++ 6.0 development environment, which can improve design efficiency. Taking a piston of axial piston pump as an example, contents and method of parametric design of axial piston pump were expounded.
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Hao, Ming, and Xiao Ye Qi. "Modeling Analysis and Simulation of Hydraulic Axial Piston Pump." Advanced Materials Research 430-432 (January 2012): 1532–35. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.1532.

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Based on characteristics of AMESim software and structural characteristics of aviation piston pump, the model of a rational aviation piston pump was constructed after simplified. In this issue, the equations of motion of the piston and the process of oil suction and oil discharge for a single piston are theoretically analyzed. The effects of the four kinds of leakage to the loss of flow rate and to the pulsing of the pump are emphatically analyzed. Through build the model of axial piston pump, which provides certain theoretical basis for design different kinds of model of the piston pump.
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Wan, Li-rong, Yan-jie Lu, Qing-liang Zeng, Kui-dong Gao, and Shou-bo Jiang. "The Research on Comprehensive Performance Evaluation of Axial Piston Pump Based on AHP." Mathematical Problems in Engineering 2018 (August 23, 2018): 1–13. http://dx.doi.org/10.1155/2018/9469064.

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The axial piston pump is an important industrial power element, and its performance directly affects the operation of the system. However, owing to its complex structure and harsh operational environment, the actual operational performance of the axial piston pump is difficult to be assessed accurately, which makes ensuring the normal operation of the hydraulic system difficult. To improve the evaluation method for an axial piston pump, a comprehensive performance evaluation system was proposed based on analytic hierarchy process (AHP), which could assess the performance of an axial piston pump on the basis of theoretical analysis, test, operator interaction, and application. Considering a model of load-sensitive axial piston pump with good operability as an example, the model development and simulation of the pump were carried out based on AMESim and the pump was tested using a developed performance test bed for axial piston pump. The weights of factors in the evaluation system were determined on the basis of the simulation results, analyses, and calculation. The above results were used to comprehensively analyze the tested pump and design a set of comprehensive performance evaluation software. The evaluation result was nearly identical to the actual usage, which verified the feasibility of the designed evaluation system.
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Pan, Yang, Yibo Li, and Dedong Liang. "The influence of dynamic swash plate vibration on outlet flow ripple in constant power variable-displacement piston pump." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 14 (March 31, 2019): 4914–33. http://dx.doi.org/10.1177/0954406219840379.

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The vibration of a swash plate is caused by the piston forces and the control actuator acting on the swash plate. An earlier study of the outlet flow ripple of variable-displacement axial piston pumps assumed a fixed swash plate angle; it ignored the influence of swash plate vibration on the outlet flow ripple of the axial piston pump. In this work, a theoretical model of the outlet flow ripple and pressure pulsation was established in a constant power variable-displacement piston pump. The vibration of swash plate, flow leakage, and valve dynamic characteristics are considered in the theoretical model. The computational results of the theoretical model at different external load pressures are verified by comparison with experimental results. The vibration of the swash plate is strongly influenced by both the piston chamber pressure variation and the control actuator mechanism. The study proved the influence of the swash plate vibration on the outlet flow ripple and the pressure pulsation of an axial piston pump. Compared to the case of a fixed swash plate angle, accounting for swash plate vibration is much more suitable for the accurate determination of the outlet flow ripple and pressure pulsation of an axial piston pump. It is also shown that the vibration of the swash plate affects the valve plate design. Accordingly, valve plate optimization based on the theoretical model of the outlet flow ripple was also studied in this work. The amplitude of the instantaneous outlet flow ripple was considered as the optimization objective function. Finally, the optimized design parameters for a constant power variable-displacement swash plate axial piston pump were evaluated.
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Fu, Jiang Feng, Hua Cong Li, Jia Li, and Shu Hong Wang. "Kinematics Modelling and Simulation of Aero-Engine Fuel Piston Pump." Applied Mechanics and Materials 680 (October 2014): 299–302. http://dx.doi.org/10.4028/www.scientific.net/amm.680.299.

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Kinematics parameters calculation is the basis of piston pump design and performance analysis. Taking an axial piston pump with incline piston and spherical swash plate as the research object, Aimed at the deficiency of current formula for calculating piston pump kinematics parameters which included displacement, velocity and acceleration. In this paper, according to piston pump part motion geometry relationship, a correction kinematics algorithm is deduced by using the the spherical coordinate and cartesian coordinate transformation method, the analyse method and deduction procedure ensure the new calculating formula are precise in theory. Applying the calculating formula to an aero engine fuel axial piston pump, results show that. The displacement, velocity, acceleration according to the kinematics principle of piston pump, it can be used in the kind of piston pump kinematics parameters calculation and current calculating method evaluation.
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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.

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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.
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Dissertations / Theses on the topic "Axial piston pump"

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Lyu, Fei, Junhui Zhang, and Bing Xu. "Wear prediction of piston/cylinder pair in axial piston pump." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71106.

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The piston/cylinder pair is the key lubricating interface of axial piston pumps. It suffers from excessive wear due to the huge lateral force, especially under high output pressure. In order to achieve predictive maintenance, it is significant to detect the performance degradation of the piston/cylinder pair. In this paper, a method to predict the wear of the piston/cylinder pair is proposed. The wear regions and corresponding wear depths under different conditions are investigated. The distributive characteristic parameters of the oil film are obtained, which can reflect the load-bearing and lubrication conditions at each region of the friction pair. Based on the oil film characteristic parameters, the most suitable wear model is chosen to calculate the wear depth, and then the entire wear profile of the piston/cylinder pair is obtained. The experimental investigation is carried out, and the results show that the accuracy of the wear regions and corresponding wear depth prediction is high. This method can be used to pump healthy management and choose the suitable working conditions of the axial piston pump.
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Kumar, Sushil. "CFD Analysis of an axial piston pump." Doctoral thesis, Universitat Politècnica de Catalunya, 2010. http://hdl.handle.net/10803/21794.

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En el ámbito de la Oleohidráulica, las bombas de pistón poseen los diseños más sofisticados, de hecho, las bombas de pistones son las únicos capaces de trabajar a altas presiones, además de poseer el mejor rendimiento de todo el grupo de bombas existentes. Sin embargo, cabe señalar que todos los diseños de las bombas de pistón, se basan principalmente en la experiencia de los diseñadores, por lo tanto no existen herramientas matemáticas para optimizar el diseño de las diferentes partes de las bombas. Por otra parte, en la actualidad hay empresas como Oilgear Towler, que inserta ranuras (surcos) en los patines deslizantes y en los pistones, (dos partes principales de estas bombas), pero no hay ningún estudio científico para analizar sus ventajas o desventajas. Por lo tanto, es necesario comprender matemáticamente las ventajas y desventajas debido a la presencia de ranuras en la superficie de diferentes partes de la bomba. Hay cuatro superficies de deslizamiento en las bombas de pistones, plato inclinado patín deslizante, barrilete y placa de cierre, pistón cilindro y junta esférica entre pistón y patín deslizante. Lubricación entre estas superficies es necesaria, apareciendo por tanto fugas de fluido a bombear entre las mismas. En este proyecto, nuestro objetivo es analizar cada una de estas diferentes superficies de deslizamiento por separado para comprender su diseño y el efecto de los parámetros de diseño en el comportamiento de la bomba. Una vez se tenga un buen entendimiento de las diferentes partes de la bomba de pistones, el objetivo es modelar el comportamiento dinámico de la presión y flujo en la salida de la bomba. En concreto se ha realizado: Conjunto plato inclinado, patín deslizante – Estudio de las características estáticas y dinámicas del patín deslizante, incluyendo la ranura tallada en el patín. Las ecuaciones de Navier Stokes en coordenadas cilíndricas se han aplicado entre el patín y el plato incluyendo la ranura. Los resultados presentados en este trabajo contemplan, distribución de la presión, las fugas de fluido, la fuerza y par sobre el patín, se ha estudiado la variación de dichos parámetros al modificar las dimensiones y posición de la ranura. El comportamiento dinámico del patín se ha tenido también en cuenta. Se estudia la posición de la ranura con el fin de optimizar el comportamiento del patín. Barrilete, placa de cierre.- Se analiza mediante la simulación de las ecuaciones de Reynolds de lubricación por FDM (método de diferencias finitas), la distribución de presiones, las fugas, la fuerza y los pares entre el barril y la placa de cierre. La fuerza total y los pares de torsión sobre el barril, se evalúan partiendo de la presión simulada, mostrando que los pares dinámicos que existen sobre el eje XX son mucho menores que los pares actuantes sobre el eje YY. . Pistón cilindro - Se ha investigado el comportamiento del pistón mediante la modificación del número de ranuras y su posición, la distribución de la presión en el intersticio pistón-cilindro, la fuerza sobre el pistón, las fugas y el par de torsión que actúa sobre el pistón se han analizado. También las zonas donde la cavitación es probable que aparezca se han presentado, se discute la forma de prevenir la aparición de cavitación a través del uso de ranuras. La ecuación de lubricación de Reynolds se ha modelizado en el intersticio pistón-cilindro mediante el uso de volúmenes finitos, la excentricidad y el movimiento relativo pistón-cilindro se han considerado. Diferentes configuraciones de ranuras han sido evaluadas con el fin de encontrar mínimas fugas, máximo par y mínima aparición de cavitación. Se especifican instrucciones de diseño para optimizar el comportamiento del pistón. Modelo dinámico de la bomba.- Se ha presentado un amplio conjunto de ecuaciones explícitas para cada parte con movimiento relativo de la bomba de pistones. Todas las ecuaciones se han validado mediante un análisis numérico y en su caso experimental. Las ecuaciones han sido combinadas para estudiar de forma dinámica las perturbaciones de presión y el caudal de fugas. El efecto de la pulsación de caudal cuando se modifica el diseño de la bomba también es presentado. En esta tesis, un modelo de simulación basado en ecuaciones analíticas se ha desarrollado, modelo que produce resultados muy rápidamente y aclara con mucha precisión el efecto de las fugas a través de los diferentes intersticios de la bomba.
In the field of Fluid Power, piston pumps possess the most sophisticated designs, in fact, pistons pumps are the only ones capable of working at high pressures, besides possessing the best performance (efficiency) of the entire group of existing pumps. However, it is noted that all the designs of piston pumps, are mostly based on the experience of the designers, thus there exist no mathematical tools for optimizing the design of the different parts of the pumps. On the other hand, there are now companies like Oilgear Towler, who inserted slots (grooves) in the slippers and in the pistons, (two major parts of these pumps) but there is no scientific study to analyze its advantages or disadvantages. There is therefore a need to understand mathematically to study the advantages and disadvantages due to the presence of the groove on the surface of different pump parts. There are four sliding surfaces in the piston pump, Slipper-swash plate gap, Barrel-valve plate gap, Piston-barrel chamber gap and Spherical bearing, where lubrication exists and leakages through these channels occur. In this project, our aim is to analyze each of these different sliding surfaces separately to understand its design constrains and the effect of the design parameters on the pump behavior. After having a better understanding of all the different parts of the piston pump, the aim is to model the dynamic behavior of pressure and flow at the outlet of the pump. Slipper plate gap - To understand static and dynamic characteristics of a piston pump slipper with a groove. Three dimensional Navier Stokes equations in cylindrical coordinates have been applied to the slipper/plate gap, including the groove. The results presented in this thesis include, pressure distribution, leakage, force and torque variations when groove dimensions and position are being modified, the effect of slipper tangential velocity and turning speed are also considered. Design instructions to optimize slipper/groove performance are also given. Barrel-valve plate gap - Present thesis, analyses the pressure distribution, leakage, force and torque between the barrel and the port plate of an axial piston pump by simulating Reynolds equations of lubrication by FDM (finite difference method). The overall mean force and torques over the barrel are evaluated from simulated pressure and it shows that the torque over the XX axis is much smaller than the torque over the YY axis. A detailed dynamic analysis is then studied by using the temporal torque calculated by Bergada. Piston-barrel chamber gap - It is being investigated the piston performance by modifying the number of grooves and their position, pressure distribution in the clearance piston-cylinder, leakage force and torque acting over the piston will be discussed, also the locations where cavitation is likely to appear will be presented, discussing how to prevent cavitation from appearing via using grooves. A finite volume based Reynolds equation model has been formulated for the piston-cylinder clearance which considers the piston eccentricity and the relative tangential movement between piston and barrel. Different configurations of the grooves have been evaluated in search of finding minimum leakage, minimum appearance of cavitation and maximum restoring torque. Design instructions to optimize the piston behavior are also given. Full pump Model - An extensive set of explicit equations for every pump gap will be presented. All of the equations will be checked via performing a numerical analysis of the specified pump clearance, the equations will then be combined to study dynamically pressure ripple and leakages. The effect on the flow ripple when modifying the pump design will also be presented. Therefore in present thesis, a simulation model based on analytical equations has been developed which produce very fast results and clarify very precisely the effect of different leakages happened through the pump clearances.
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Haynes, Jonathan Mark. "Axial piston pump leakage modelling and measurement." Thesis, Cardiff University, 2007. http://orca.cf.ac.uk/55178/.

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This thesis is concerned with the dominant leakage characteristics of an axial piston pump. Results have been obtained from a combination of analysis, Computational Fluid Dynamics (CFD) and experimental work, and have added to existing knowledge in this field. The measurement of slipper leakage within an axial piston pump is impossible due to additional leakage from the pistons and between the cylinder barrel and port plate. It may only be determined by analysis and this aspect has been studied via a new CFD simulation. Further progress has been made experimentally on slipper leakage. A new test apparatus was designed and developed by the author and comparisons have been made with parallel analytical work. Previous research in this area has concentrated on single-landed slippers and leakage rates from such slippers have been examined, however only under static conditions. The work in this thesis is the first to consolidate experimental studies on multiple-land slippers, and the first to measure slipper leakage under dynamic conditions. These results have been compared with both CFD simulations and a new theoretical study undertaken in parallel with this work. The new test apparatus allowed measurement of both leakage and groove pressure under a range of operating conditions. It was established that the presence of a groove reduces the restoring moment produced, and hence enables the slipper to operate with an appropriate angle of tilt, thus permitting hydrodynamic lift to more readily exist. However, this occurs at a cost of increased leakage. In addition to the experimental work on slippers, the time-varying pressures within selected cylinders of an axial piston pump were measured. In parallel, a fully dynamic CFD model of a pump was produced. This model included all leakage paths from the pump. It was discovered that the port plate leakage dominated the overall leakage, with slipper leakage still being significant, but with piston leakage insignificant. This model was also used to predict the flow and pressure ripple from the pump and the predictions were compared with experimental measurements.
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Harrison, Adrian M. "Reduction of axial piston pump pressure ripple." Thesis, University of Bath, 1997. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760701.

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Michael, Paul W., and Shreya Mettakadapa. "Bulk Modulus and Traction Effects in an Axial Piston Pump and a Radial Piston Motor." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200173.

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This paper describes an investigation into the effects of fluid bulk modulus and traction coefficient properties on piston pump flow losses and radial pison motor torque losses through experimentation, modelling and simulation. Synthetic ester, high bulk modulus, multi-grade, and single grade mineral oils were evaluated. The high bulk modulus fluid exhibited 20% lower pump case and compensator flow losses than a conventional mineral oil of the same viscosity grade. Low traction coefficient fluids reduced the lowspeed torque losses of the radial piston motor by 50%. Physical models for pump case flow and motor torque losses were derived from the experimental data. Field data was collected from a hydraulically propelled agricultural machine. This data was used to model fluid performance in the machine. The simulation results predict that at an operating temperature of 80⁰C, optimizing the bulk modulus and traction coefficients of the fluid could reduce flow losses by 18% and torque losses by 5%. These findings demonstrate the potential of combining comprehensive fluid analysis with modeling and simulation to optimize fluids for the efficient transmission of power.
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Kayani, Omer Khaleeq, and Muhammad Sohaib. "Generic Simulation Model Development of Hydraulic Axial Piston Machines." Thesis, Linköpings universitet, Fluida och mekatroniska system, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-76575.

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This master thesis presents a novel methodology for the  development of simulation models  for hydraulic pumps and motors. In this work, a generic simulation model capable of representing multiple axial piston machines is presented, implemented and validated. Validation of the developed generic simulation model is done by comparing the results from the simulation model with experimental measurements. The development of the generic model is done using AMESim. Today simulation models are an integral part of any development process concerning hydraulic machines. An improved methodology for developing these simulation models will affect both the development cost and time in a positive manner. Traditionally, specific simulation models dedicated to a certain pump or motor are created. This implies that a complete rethinking of the model structure has to be done when modeling a new pump or motor. Therefore when dealing with a large number of pumps and motors, this traditional way of model development could lead to large development time and cost. This thesis work presents a unique way of simulation model development where a single model could represent multiple pumps and motors resulting in lower development time and cost. An automated routine for simulation model creation is developed and implemented. This routine uses the generic simulation model as a template to automatically create simulation models requested by the user. For this purpose a user interface has been created through the use of Visual Basic scripting. This interface communicates with the generic simulation model allowing the user to either change it parametrically or completely transform it into another pump or motor. To determine the level of accuracy offered by the generic simulation model, simulation results are compared with experimental data. Moreover, an optimization routine to automatically fine tune the simulation model is also presented.
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Mehta, Viral. "Torque ripple attenuation for an axial piston swash plate type hydrostatic pump noise considerations /." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4380.

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Thesis (Ph.D.)--University of Missouri-Columbia, 2006.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (February 28, 2007). Vita. Includes bibliographical references.
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Rizzo, Giuseppe, Antonino Bonanno, Giorgio Paolo Massarotti, Luca Pastorello, Mariarosa Raimondo, Federico Veronesi, and Magda Blosi. "Energy efficiency improvement by the application of nanostructured coatings on axial piston pump slippers." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200187.

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Axial piston pumps and motors are widely used in heavy-duty applications and play a fundamental role in hydrostatic and power split drives. The mechanical power losses in hydraulic piston pumps come from the friction between parts in relative motion. The improvement, albeit marginal, in overall efficiency of these components may significantly impact the global efficiency of the machine. The friction between slipper and swash plate is a functional key in an axial piston pump, especially when the pump (at low rotational speed or at partial displacement) works in the critical areas where the efficiency is low. The application of special surface treatments have been exploited in pioneering works in the past, trying different surface finishing or adding ceramic or heterogeneous metallic layers. The potential of structured coatings at nanoscale, with superhydrophobic and oleophobic characteristics, has never been exploited. Due to the difficulty to reproduce the real working conditions of axial piston pump slippers, it has been made a hydraulic test bench properly designed in order to compare the performance of nano-coated slippers with respect to standard ones. The nano-coated and standard slippers have been subjected to the following working conditions: a test at variable pressure and constant rotational speed, a test at constant pressure and variable rotational speed. The comparison between standard and nanocoated slippers, for both working conditions, shows clearly that more than 20% of friction reduction can be achieved using the proposed nano-coating methodology.
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Haug, Stefan, and Marcus Geimer. "Optimization of Axial Piston Units Based on Demand-driven Relief of Tribological Contacts." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199583.

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Markets show a clear trend towards an ever more extensive electronic networking in mobile and stationary applications. This requires a certain degree of electronic integration of hydraulic components such as axial piston pumps. Beside some wellknow approaches, the transmission of axial piston units still is relatively unexplored regarding electronification. Nonetheless there is a quite high potential to be optimized by electronic. In view of this fact, the present paper deals with the tribological contacts of pumps based on a demand driven hydrostatic relief. The contact areas at cylinder - distributor plate, cradle bearing and slipper - swash plate will be investigated in detail and it will be shown how the pump behavior can be improved considerably through a higher level of relief and a central remaining force ratio. The potential of optimization is to improve the efficiency, especially in partial loaded operation, power range, also for multi quadrant operation, precision and stability. A stable lubricating film for slow-speed running and for very high speeds at different pressures is ensured as well.
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Huang, Xiaochen, Bing Xu, and Junhui Zhang. "The influence of the swash plate oscillation on pressure ripple in variable displacement axial piston pump." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71101.

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The displacement of the variable displacement pumps can be adjusted by changing the swivel angle of the swash plate. In fact, the swivel angle oscillates because of the oscillating torque on the swash plate, which caused by the pressure fluctuation of the piston chamber. The swivel angle is most often considered as a constant value in previous studies. However, the oscillation of the swash plate leads to an additional movement of the piston, which has an impact on the pressure fluctuation and the flow ripple. In this study, an improved model of a self-supplied variable displacement pump is established. The swash plate oscillation under different operating conditions is presented. In order to investigate the effect of the swash plate oscillation on the pressure ripple, a comparison between the case of the fixed swash plate and the oscillated swash plate is conducted. Results show the pressure ripple with an oscillated swash plate shows a smaller pressure ripple. It also shows that the nine pistons and the control mechanism both affect the pressure ripple and flow fluctuation.
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Books on the topic "Axial piston pump"

1

Li, Kwok yan. Lubrication of axial piston pump slippers. Birmingham: University of Birmingham, 1988.

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Fluid Power Pumps and Motors: Analysis, Design and Control. McGraw-Hill Education, 2013.

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Parker, Philip M. The 2007-2012 World Outlook for Non-Aerospace-Type Variable-Displacement Closed-Loop Axial Piston Reciprocating Fluid Power Pumps. ICON Group International, Inc., 2006.

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The 2006-2011 World Outlook for Non-Aerospace-Type Variable-Displacement Closed-Loop Axial Piston Reciprocating Fluid Power Pumps. Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 World Outlook for Non-Aerospace-Type Variable-Displacement Open-Loop Axial Piston Reciprocating Fluid Power Pumps. ICON Group International, Inc., 2006.

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Book chapters on the topic "Axial piston pump"

1

Załuski, Paweł. "Experimental Research of an Axial Piston Pump with Displaced Swash Plate Axis of Rotation." In Lecture Notes in Mechanical Engineering, 135–45. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-59509-8_12.

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Hu, Jinwei, Yuan Lan, Xianghui Zeng, Jiahai Huang, Bing Wu, Liwei Yao, and Jinhong Wei. "Fault Diagnosis on Sliding Shoe Wear of Axial Piston Pump Based on Extreme Learning Machine." In Proceedings in Adaptation, Learning and Optimization, 114–22. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01520-6_10.

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Petrovic, R., M. Andjelkovic, M. Radosavljevic, and N. Todic. "Experimental Research and Optimization of Characteristic Parameters of the Valve Plate of the Axial Piston Pump/Motor." In The Latest Methods of Construction Design, 173–83. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-22762-7_27.

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Gupta, Abhisek, Nitesh Mondal, and Rana Saha. "Stress and Deformation Analysis of a Swash Plate Type Variable Displacement Axial Piston Pump Through Solidworks Environment." In Advances in Mechanical Engineering, 1593–600. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0124-1_139.

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Enekes, C., and H. Murrenhoff. "Efficiency of Axial Piston Pumps with Coated Tribological Systems." In Friction, Wear and Wear Protection, 575–81. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527628513.ch74.

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Bonanno, Antonino, Mariarosa Raimondo, and Stefano Zapperi. "Surface Nano-structured Coating for Improved Performance of Axial Piston Pumps." In Factories of the Future, 295–314. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-94358-9_14.

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Patrosz, Piotr. "Influence of Gaps’ Geometry Change on Leakage Flow in Axial Piston Pumps." In Lecture Notes in Mechanical Engineering, 76–89. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-59509-8_7.

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Kuzmin, Anton, Valery Popov, and Sergey Stazhkov. "Advanced Axial Piston Swash Plate Pump Parameters Recommendations." In Proceedings of the 27th International DAAAM Symposium 2016, 0556–61. DAAAM International Vienna, 2016. http://dx.doi.org/10.2507/27th.daaam.proceedings.082.

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"Variable displacement axial piston pump: acoustic and functional characterization." In Fluid Power, 380–85. CRC Press, 1993. http://dx.doi.org/10.4324/9780203223475-121.

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"AXIAL PISTON PUMPS AND MOTORS." In Hydraulic Power System Analysis, 275–90. CRC Press, 2006. http://dx.doi.org/10.1201/9781420014587-18.

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Conference papers on the topic "Axial piston pump"

1

Li, Zeliang, Richard Burton, and Peter Nikiforuk. "Experimental Simulation of Piston Leakage in an Axial Piston Pump." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79761.

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A method used to introduce “artificial leakage” into an axial piston pump to simulate leakage from a worn piston is described in this paper. A pressure control servo valve with a very high frequency response was employed to divert flow from the pump outlet in a prescribed waveform directly to tank. The purpose was to simulate piston leakage from the high pressure discharge chamber to the pump case drain chamber as the “simulated worn piston” made contact with the high pressure chamber. The system and associated control algorithms mimiced the action of a single worn piston at various degrees of wear. The experimental results indicated that the experimental system could successfully introduce artificial leakage into the pump which was consistent with a unit with a “real” worn piston. Comparisons of the pressure ripples from an actual faulty pump (with one worn piston) and the artificial faulty pump (with one simulated worn piston) are presented.
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Lyu, Fei, Junhui Zhang, and Bing Xu. "Wear prediction of piston/cylinder pair in axial piston pump." In 12th International Fluid Power Conference. Technische Universität Dresden, 2020. http://dx.doi.org/10.25368/2020.43.

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Haiji, Wang, and Shi Guanglin. "Study of a Novel Axial Piston Pump with Adjustable Tilting Piston." In 2019 IEEE 8th International Conference on Fluid Power and Mechatronics (FPM). IEEE, 2019. http://dx.doi.org/10.1109/fpm45753.2019.9035861.

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Shinn, Tyler, Richard Carpenter, and Roger C. Fales. "State Estimation Techniques for Axial Piston Pump Health Monitoring." In ASME/BATH 2015 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/fpmc2015-9621.

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Catastrophic failures of hydraulic pumps can lead to significant machine downtime. In the mining and quarry sector this can lead to losses in the tens of thousands of dollars per hour. Predicting pump failures before they occur could lead to substantial savings for equipment owners. This work focuses on developing a pump health strategy using physics-based models of a load sense steering system typically found on off-highway machines. State observers are developed that estimate pump swashplate position in order to determine a theoretical pump flow. Pump efficiency is predicted using actual flow estimates based on measured cylinder velocities and compared to the estimated theoretical pump flow. The typical Kalman filter (KF) is implemented and compared to that of a Sequential Monte Carlo method, the Particle Filter. Observability is examined to determine the feasibility of the KF. The Particle Filter algorithm is considered for its ability to deal nicely with non-linear models with non-Gaussian noise terms. Results show that the system is observable using a limited number of measurements, for example, only pressure measurements. The two methods of estimating states give comparable results when applied to the simulated model. A leakage fault is introduced to the system. An extended Kalman filter (EKF) is used to estimate volumetric efficiency with the unknown change in leakage coefficient using state and parameter estimation. The KF was found to be unable to accurately estimate the changes in volumetric efficiency with the leakage.
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Achten, Peter, Jeroen Potma, and Jasper Achten. "Low Speed Performance of Axial Piston Machines." In BATH/ASME 2018 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fpmc2018-8832.

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Low speed operation of axial piston motors has always been a critical performance issue. The breakaway torque determines the capacity of a motor to move a certain load from standstill conditions. In addition, the low speed performance has also become a critical performance parameter for pumps being applied in frequency controlled electro-hydraulic actuators. Yet, there is almost no information available about the low speed and breakaway characteristics of piston pumps and motors. A new test bench has been constructed to measure these characteristics [1]. The new bench allows operation of hydrostatic machines below 1 rpm, down to 0.009 rpm. At these conditions, the main tribological interfaces operate in the solid friction domain, at which the friction losses are at a maximum value. This research describes and analysis the test results for a number of different axial piston pumps and motors: two slipper type motors, one slipper type pump and a floating cup pump/motor. The tests have been performed at various operating pressures and operating speeds. Furthermore, the breakaway torque has also been measured after letting the hydrostatic motor stand still for one or more days.
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6

Chen Bo, Yang Guoping, Xing Dongshi, and Gao Junhao. "Modeling and Simulation of Axial Piston Hydraulic Pump." In 2011 International Conference on Measuring Technology and Mechatronics Automation (ICMTMA). IEEE, 2011. http://dx.doi.org/10.1109/icmtma.2011.438.

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Di, Wu, Wang Shaoping, and Shi Jian. "Thermal modeling of axial piston pump and application." In 2015 International Conference on Fluid Power and Mechatronics (FPM). IEEE, 2015. http://dx.doi.org/10.1109/fpm.2015.7337123.

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Bergada, J. M., and J. Watton. "Axial Piston Pump Slipper Balance With Multiple Lands." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39338.

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An explicit approach is developed which results in general flow and pressure drop equations for a multiple land slipper. A particular, and common, case of one balancing groove is considered allowing more accurate assessment of the pressure balance and probable slipper clearance. A comparison with the no-groove case is also made.
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Ericson, Liselott, and Jonas Forssell. "A Novel Axial Piston Pump/Motor Principle With Floating Pistons: Design and Testing." In BATH/ASME 2018 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fpmc2018-8937.

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This paper presents the first prototype of a novel axial piston pump/motor of slipper type. The pistons are floating in the cylinders and hence the name floating piston pump. The novel pump design fills a gap in the traditional pump design. The pump is made to fit the automobile requirements to use fluid power in a more prominent manner. One of the expected benefits of this design is its simplicity and therefore the machine does not require high manufacturing capabilities. The production cost is expected to be low. The machine is designed with high number of pistons, which leads to a pump/motor with low noise level. The displacement angle is small, 8 degrees, which leads to low piston speeds with its benefits. The main challenge in the design is the piston seal configuration. The seals will both, deform (ovality) and move in a circle relative to the pistons. The paper discusses design considerations and proposes a design. The efficiency measurement of the first prototype is in level of a series produced slipper type machine at its sweet spot.
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Lv, Fei, Xiaochen Huang, Chunfeng Zhang, and Bing Xu. "Effects of Non-Uniform Pistons Distribution on Axial Piston Pump Flow Ripple." In 2019 IEEE 8th International Conference on Fluid Power and Mechatronics (FPM). IEEE, 2019. http://dx.doi.org/10.1109/fpm45753.2019.9035824.

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Reports on the topic "Axial piston pump"

1

Campbell, J. K., and M. B. White. Axial piston pump wear plates, Delta-Q Corporation. Office of Scientific and Technical Information (OSTI), April 1994. http://dx.doi.org/10.2172/10149981.

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Vetterick, Gregory Alan. Lead-free, bronze-based surface layers for wear resistance in axial piston hydraulic pumps. Office of Scientific and Technical Information (OSTI), January 2010. http://dx.doi.org/10.2172/1342566.

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