Relevant bibliographies by topics / Axial Piston Units

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Axial Piston Units'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Axial Piston Units"

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VATHEUER, Nils, Hubertus MURRENHOFF, Ulrich BRÄCKELMANN, and David BREUER. "Mechanical Losses in the Piston-Bushing Contact of Axial Piston Units." JFPS International Journal of Fluid Power System 8, no. 1 (2014): 24–29. http://dx.doi.org/10.5739/jfpsij.8.24.

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Воронов, Сергей, Sergey Voronov, Вероника Гаврилова, and Veronika Gavrilova. "RELIABILITY INCREASE IN HIGH-DYNAMIC AXIAL-PISTON HYDROMACHINES." Bulletin of Bryansk state technical university 2016, no. 4 (December 28, 2016): 170–79. http://dx.doi.org/10.12737/23210.

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At present time there is a trend of specific power increase in axial-piston hydromachines (APHM) that results in increase, volumetric and mechanical losses loads and servicing characteristics decrease. It requires a corresponding reliability increase in hydromachines of this type. Basic reasons of capacity loss and APHM ser-vicing characteristics decrease are sliding couples: a cylinder block – edge distributor, pistons-cylinders walls. Nonmetallic antifriction materials used for manufacturing coatings of interacting surfaces in parts are considered most promising for manufacturing coat-ings for operation surfaces in parts of friction units of APHM. In connection with the evident topicality of the scientific-practical problem of reliability increase in modern high-dynamic APHMs there was offered a procedure of choice of anti-friction materials, their sliding couples and an algorithm of its realization. The procedure is based on the comparison of performance of antifriction materials used with parameters of an operation mode of friction couples and also power loss for friction and material wear intensity. As basic performances there were assumed maximum contact pressures, temperature and rates of a relative motion of mating surfaces, and as a parameter characterizing material durability, - comparative linear wear intensity. The realization of a procedure for an axial-piston pump with a sloped disk with the capacity of 15 cm3 allowed justifying a purposefulness of the applica-tion for “pistons-cylinder walls” couples of fluoroplas-tic materials, for the rest of couples – hydro-nitration.
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Baus, Ivan, Robert Rahmfeld, Andreas Schumacher, and Henrik Pedersen. "LOAD CYCLE INVESTIGATION OF AXIAL PISTON UNITS INTEGRATED INTO A FORWARDER." MM Science Journal 2018, no. 03 (September 25, 2018): 2460–65. http://dx.doi.org/10.17973/mmsj.2018_10_201837.

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Tkach, Vyacheslav. "INFLUENCE OF WORKING FLUID VISCOSITY ON LUBRICATION MODE OF HYDRAULIC UNITS OF CONSTRUCTION MACHINES." Globus: technical sciences 7, no. 3(39) (August 19, 2021): 3–8. http://dx.doi.org/10.52013/2713-3079-39-3-1.

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The influence of dynamic viscosity of working liquids И-20А, МГЕ-46В, ВМГЗ on the lubrication of plunger pairs of axial-piston pumps of construction equipment is considered in the article. Based on the existing classification of lubricant types, a mathematical model is obtained to determine the effective viscosity, which corresponds to the transition of the plunger pair from the boundary lubrication regime to the semi-liquid mode. The obtained model takes into account the geometric parameters, the speed of rotation of the pump shaft and the size of the dimensionless criterion — the relative thickness of the lubricating film. The calculation of the change in the effective viscosity from the angle of rotation of the shaft for a plunger pair of an axial-piston pump with an inclined disk.
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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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Sabuga, W., A. S. Hashad, and S. Ehlers. "2D flow model for calculating effective area of piston-cylinder units." ACTA IMEKO 9, no. 5 (December 31, 2020): 319. http://dx.doi.org/10.21014/acta_imeko.v9i5.992.

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A 2D flow model is described for calculation of the effective area (<em>A</em>) of pressure-measuring piston-cylinder units (PCU) based on their dimensional properties. With the 2D model, the uncertainty contribution associated with PCU's axial non-symmetry can be eliminated and the uncertainty of <em>A</em> can be reduced. The 2D model is applied to several primary PCUs operated in absolute and gauge pressure modes with different pressure-transmitting media. The benefit of the 2D model in dependence on PCU's geometrical perfectness is discussed.
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Babak, Vitalii, and Viatcheslav Stadnychenko. "APPLICATION OF REVITALISANTS FOR EXTENSION OF RESOURCE AND RESTORING WORN‐OUT FRICTION UNITS OF AVIATION AXIAL ‐ PISTON HYDROMACHINES." Aviation 8, no. 1 (March 31, 2004): 8–12. http://dx.doi.org/10.3846/16487788.2004.9635863.

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The perspectives of application of using RVS technique for repairing and prophylactic of hydraulic systems’ units, particularly axial‐piston machines are considered. Physical background of revitalization processes, which took place on the friction surfaces during drifting of cermets coating (CC) are uncovered. The results were received from numerous investiga‐tions.
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Shang, Lizhi, and Monika Ivantysynova. "Scaling Criteria for Axial Piston Machines Based on Thermo-Elastohydrodynamic Effects in the Tribological Interfaces." Energies 11, no. 11 (November 19, 2018): 3210. http://dx.doi.org/10.3390/en11113210.

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In lieu of reliable scaling rules, hydraulic pump and motor manufacturers pay a high monetary and temporal price for attempting to expand their production lines by scaling their existing units to other sizes. The challenge is that the lubricating interfaces, which are the key elements in determining the performance of a positive displacement machine, are not easily scalable. This article includes an analysis of the size-dependence of these units with regard to the significant physical phenomena describing the behavior of their three most critical lubricating interfaces. These phenomena include the non-isothermal elastohydrodynamic effects in the fluid domain, and the heat transfer and thermal elastic deflection in the solid domain. The performance change due to size variation is found to be unavoidable and explained through fundamental physics. The results are demonstrated using a numerical fluid–structure–thermal interaction model over a wide range of unit sizes. Based on the findings, a guide to scaling swashplate-type axial piston machines such as to uphold their efficiency is proposed.
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Rusakov, A. N. "Selection of Optimal Gas-Dynamic Parameters of Radial-Axial Turbines in Their Joint Operation with Reciprocating Internal Combustion Engines." Proceedings of Higher Educational Institutions. Маchine Building, no. 6 (735) (June 2021): 58–66. http://dx.doi.org/10.18698/0536-1044-2021-6-58-66.

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The study of radial-axial (centripetal) turbines is important for science and technology. They are widely used in the refrigeration industry, internal combustion engines, and power engineering, both in the form of auxiliary units and in autonomous power units. The article offers a method for selecting the gas-dynamic parameters of the centripetal turbine in order to obtain the highest efficiency and the best size of the turbine. The increased manufacturability of the turbine is provided due to the absence of a straightener at the outlet of the impeller and the use of straight blades in the impeller. The dependence of the efficiency of a centripetal turbine on the profiles of the blades and the radial dimensions of the nozzle apparatus and the impeller, as well as on the length of the impeller blades is investigated. Considering the recommended optimal parameters, the calculation of a pulsed centripetal turbine operating in conjunction with a four-stroke piston internal combustion engine is performed.
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Danes, Leandro, and Andrea Vacca. "A Tandem Axial-Piston Unit Based Strategy for the Reduction of Noise Sources in Hydraulic Systems." Energies 13, no. 20 (October 15, 2020): 5377. http://dx.doi.org/10.3390/en13205377.

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This article presents a novel passive fluid borne noise source reduction strategy, based on tandem axial-piston unit indexing with the usage of symmetric lines. The strategy consists of setting the phase between the two synchronous units to accomplish destructive interference in targeted unit harmonics. A strategy capable of achieving destructive interference in all odd harmonics is investigated first analytically and then confirmed by a simulation study. Experiments on the proposed strategy confirmed its effectiveness at the first and third pump fundamental harmonics, and pressure ripple reduction was accomplished. The fluid borne noise source reduction in the first and third harmonic is verified to be propagated to pipe vibration and sound power. Regarding the first harmonic, pressure ripple was reduced by up to 18 dB; while for third harmonic, pressure ripple was reduced by up to 11 dB. In the experiment, however, noise cancellation is not achieved for the higher odd harmonics, as is instead found in the simulation. Conversely, transfer functions form pressure ripple to pipe wall acceleration are obtained experimentally, and a critical vibration band from 2000 Hz to 3000 Hz is identified as being crucial for effective overall sound power reduction.
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Dissertations / Theses on the topic "Axial Piston Units"

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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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Baus, Ivan, Robert Rahmfeld, Andreas Schumacher, and Henrik C. Pedersen. "Lifetime impact prediction of component modifications in axial piston units by the failure likelihood assessment." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71266.

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In this paper, a new methodology is presented to estimate the lifetime impact of design changes, called Failure Likelihood Assessment (FLA). The discussion in this paper is on the fatigue lifetime prediction of axial piston units, especially after a design change. The demonstration object is an axial piston pump due to extreme environmental conditions and high specification demands, where the FLA is applied to a manufacturing change in an existing product and delivers an effect on the unit reliability. The resulted reliability imp rovement, if combined with typical calculation methods like Weibull analysis, delivers an increase in predicted lifetime considering the intended modification. As demonstration subje ct, a change of the manufacturing process of the cylinder block hub in an axial piston pump is used. The effect to the lifetime is predicted via the FLA-method and the results are calculated with test data and compared to theoretical results. The paper shows that the methodology delivers highly accurate results providing that the FLA is a powerful tool to analyze design changes as weil as new designs in regard to reliability and lifetime. The benefit for the user of this methodology will hence be more reliable products with optimized designs tobest fulfil customer's performance requirements.
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Conference papers on the topic "Axial Piston Units"

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Stricklin, Charles. "Design Theory of Axial Piston Units with Tapered Pistons." In 1985 SAE International Off-Highway and Powerplant Congress and Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1985. http://dx.doi.org/10.4271/851508.

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Baus, Ivan, Robert Rahmfeld, Andreas Schumacher, and Henrik C. Pedersen. "Development of Methodology for Lifetime Calculation for Axial Piston Units." In 2018 Global Fluid Power Society PhD Symposium (GFPS). IEEE, 2018. http://dx.doi.org/10.1109/gfps.2018.8472367.

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Baus, Ivan, Robert Rahmfeld, Andreas Schumacher, and Henrik C. Pedersen. "Systematic Methodology for Reliability Analysis of Components in Axial Piston Units." In ASME/BATH 2019 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/fpmc2019-1620.

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Abstract This paper covers a reliability analysis as a qualitative method, especially focused on axial piston units. The method is based on Fault Tree Analysis (FTA) and results in risk and reliability assessment at the components level. Especially, the development of the reliability assessment as a methodical tool is the core of the paper. Moreover, the FTA is combined with the industrial standard method known as Design Failure Mode Effects Analysis (DFMEA) which is typically used in the development phase of the design. The evaluation and the usability of the FTA methodology is analyzed in connection with field data. Thus, the deviation of the theoretical valuation from the field data was utilized as a success indicator of the method. The analysis of the fault spreading covers the assessment of component faults and links failure states with unit effects. The analysis of the axial piston unit as a system is made on idealized/theoretical design and functional behavior only. Hence, the failure rating and the effect is subsequently applied to determine the fault risk in form of the Risk Priority Number (RPN). The failure modes and effects are based on engineering experience of past decades, supported by existing DFMEAs of axial piston units. Thus, the assessment of the risk priority number is based on previous data, yielding the given severity, occurrence and detection quantification. This approach opens new opportunities of design assessment and the results show a good agreement to the damage accumulation seen in real field data. Furthermore, the connection between theoretical design assessment and field data do support the failure ranking improvement of the DFMEA.
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Achten, Peter A. J. "Power Density of the Floating Cup Axial Piston Principle." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59006.

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The floating cup principle is a new concept for hydrostatic pumps, motors and transformers. It features a large number of pistons, which enables a strong reduction of the pressure pulsations and fluid borne noise. The pistons are arranged in a double ring, back-to-back configuration, and are locked onto the rotor. Each piston has a separate, cuplike cylinder, which is floating on a rotating barrel plate. This article will discuss the consequences of the floating cup design on the power density of pumps and motors. For current axial piston units the trend is towards larger tilt angles of the barrel. In slipper type machines, the tilt angles can be as large as 21°, whereas in bent axis machines the tilt angle can even be increased to 45°. For a 24 piston floating cup machine, the tilt angle of each barrel is however limited to about 12°. The object of the article is to prove that the reduced tilt angle does not need to have a detrimental effect on the power density of the hydrostatic machine. After giving a brief description of the floating cup principle, the article will focus on the design aspects that limit the barrel tilt angle. After this, the main parameters that govern the power density are discussed. A comparison with a slipper type pump is made.
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Sarode, Shanmukh, and Lizhi Shang. "Novel Pressure Adaptive Piston Cylinder Interface Design for Axial Piston Machines." In ASME/BATH 2019 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/fpmc2019-1645.

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Abstract The paper presents a novel concept of a pressure adaptive piston/cylinder interface design for a swashplate type axial piston machine that uses a pressurized groove around the bushing inside the cylinder block. This groove is connected to the pump displacement chamber and it uses pressure deformations of the bushing to improve the sealing function of the piston/cylinder lubricating interface. Such a design concept is based on a groove design that is easy to manufacture, thus resulting in a cost-effective design solution. The proposed piston/cylinder interface design is simulated using a multi-domain simulation model developed by the authors’ research team. The tool is particularly suitable for the analysis of the internal gap flows, being based on a fully coupled fluid structure thermal interaction model, which calculates the non-isothermal gap fluid behavior considering solid body deformations due to temperature and pressure effects. The proposed solution is compared in simulation with respect to a standard design of an axial piston pump. The results indicate that the proposed pressure adaptive piston/cylinder interface is able to improve the sealing function of the piston/cylinder interface at different operating conditions. Therefore, the proposed novel design can be seen as a possible method to increase the energy efficiency of the current designs of swash plate units.
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Baus, Ivan, Robert Rahmfeld, Andreas Schumacher, and Henrik C. Petersen. "Lifetime impact prediction of component modifications in axial piston units by the failure likelihood assessment." In 12th International Fluid Power Conference. Technische Universität Dresden, 2020. http://dx.doi.org/10.25368/2020.121.

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Frosina, Emma, Gianluca Marinaro, and Adolfo Senatore. "Experimental and Numerical Analysis of an Axial Piston Pump: A Comparison Between Lumped Parameter and 3D CFD Approaches." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5406.

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Abstract In this paper an axial piston pump is studied using numerical and experimental approaches. The pump, manufactured by the company Continental Hydraulic Inc., has a maximum operating pressure limit of 280 bar and a displacement of 65.9 cm3/rev; it is a variable swashplate design with nine-piston, suitable for open circuit application, medium to high pressure. Two numerical approaches have been compared to simulate the pump units. First of all, an accurate 3D -CFD model has been built up putting emphasis on the description of the detailed features of the flow through the unit. Specific attention has been reserved to the flow losses due to cavitation. Then a fast-lumped parameter approach has been built up focusing the attention on the valve plate geometry. Using the proposed numerical approaches, it is possible to fully understand the unit operation with, obviously, different assumptions and level of result details. Numerical models have been validated with an experimental data performed by the pump manufactured on their test ring with high agreement. As results, the proposed analysis permit to gain a high level of understanding of the operation of the unit finding the critical aspects and giving important information to the designer in order to improve the pump performance. By the end a new valve plate has been designed to improve the pump volumetric efficiency and to reduce the flow ripples and the reverse flow.
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Shang, L., and M. Ivantysynova. "An Investigation of Design Parameters Influencing the Fluid Film Behavior in Scaled Cylinder Block/Valve Plate Interface." In 9th FPNI Ph.D. Symposium on Fluid Power. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fpni2016-1540.

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The efficiency of an axial piston pump or motor is dominated by the volumetric and torque losses of the three main lubricating interfaces (piston/cylinder, cylinder block/valve plate, and slipper/swash plate). The research study in this paper only focuses on the cylinder block/valve plate interface. The goal of this research is to investigate a novel approach for scaling the cylinder block/valve plate interface to have the same percentage of volumetric and torque losses of the baseline interface. To achieve this research goal, many design parameters influencing the performance of the interface are investigated. An in-house developed fluid structure and thermal interaction model was used to analyze the cylinder block/valve plate interface including the resulting parts temperature, the parts elastic deformation due to pressure and thermal load, the fluid film properties and resulting energy dissipation, friction torque, and leakage of cylinder block/valve plate interfaces. This model is utilized to simulate the cylinder block/valve plate interface performance of different sizes of the displacement units. In this paper, the displacement volume of the biggest unit is sixty-four times larger than the smallest unit. The computational study reveals the design parameters influencing the elastic deformations of the solid parts and the energy dissipation and stability of the fluid film in cylinder block/valve plate interface of different sizes. Based on these investigations, a novel scaling approach to scale the cylinder block/valve plate interface is discussed.
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Schmidt, Lasse, Michael Liedhegener, Michael M. Bech, and Torben O. Andersen. "Dynamic Analysis and Characterization of Conventional Hydraulic Power Supply Units." In BATH/ASME 2016 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fpmc2016-1756.

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Hydraulic power units operated as constant supply pressure systems remain to be widely used in the industry, to supply valve controlled hydraulic drives etc., where the hydraulic power units are constituted by variable pumps with mechanical outlet pressure control, driven by induction motors. In the analysis of supplied drives, both linear and rotary, emphasis is commonly placed on the drives themselves and the related loads, and the supply system dynamics is often given only little attention, and usually neglected or taken into account in a simplified fashion. The simplified supply system dynamics used in such analyzes is often justified by short supply lines and/or the utilization of accumulators near valve inlets, accounting for the majority of possible supply pressure variations. Such considerations are reasonable in many test benches, where the supply pressure variations are small enough such that limited impact on the drive dynamics is observed. Such ideal properties however, are not necessarily present in industrial hydraulic applications for various reasons, with the most common being large volumes of supply lines. Long supply lines, hence large supply line volumes, between the supply system and drives will reduce the flow-to-pressure gain of the supply system, and hence increase the time constant of the supply pressure dynamics. A consequence of this may be large variations in the supply pressure, hence large variations in the pump shaft torque, and thereby the induction motor load torque, with possible excitation of the induction motor dynamics as a result. In such cases, the coupled dynamics of the pressure controlled pump and induction motor may influence the supply pressure significantly, possibly affecting the dynamics of the supplied drives, especially in cases where pilot operated valves with internal pilot supply are used. This paper is concerned with the analysis and characterization of the coupled pump-induction motor dynamics, confined to hydraulic power units constituted by an axial piston pump with mechanical outlet pressure control, driven by an induction motor operated at grid conditions. Furthermore, a simplified general model representation of the coupled dynamics is established, accounting for the entire dominating dynamics of the supply unit. Results demonstrate the accuracy of the simplified model representation.
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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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