Artigos de revistas: "Axial piston machine"

1

Manring, Noah D., Viral S. Mehta, Frank J. Raab e Kevin J. Graf. "The Shaft Torque of a Tandem Axial-Piston Pump". Journal of Dynamic Systems, Measurement, and Control 129, n.º 3 (7 de dezembro de 2006): 367–71. http://dx.doi.org/10.1115/1.2719785.

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The objective of this study is to identify the best indexed position of two rotating groups within a tandem axial-piston pump for attenuating the torque ripple amplitude that is exerted on the shaft. By attenuating the torque ripple characteristics of the pump, other vibration aspects of the machine are also expected to be reduced. In particular, the objectives of this paper are aimed at reducing the noise that is generated by the pump. This paper begins by considering the theoretical torque ripple that is created by the discrete pumping elements of a single rotating group within an axial piston machine. From this analysis, an equation is produced that describes a single pulse for the torque ripple as a function of the average torque and the total number of pistons that are used within the rotating group. By superposing another rotating group on top of the first, and by indexing the angular position of one rotating group relative to the other, a second equation is produced for describing the theoretical torque ripple of a tandem pump design. This equation is also a function of the average shaft torque and the total number of pistons that are used within a single rotating group; however, an additional parameter known as the index angle also appears in this result. This index angle is shown to amplify or attenuate the amplitude of the torque ripple depending upon its value. From these results, it is shown that a proper selection of the index angle can reduce the torque ripple amplitude by as much as 75%.

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2

Manring, Noah D. "Friction Forces Within the Cylinder Bores of Swash-Plate Type Axial-Piston Pumps and Motors". Journal of Dynamic Systems, Measurement, and Control 121, n.º 3 (1 de setembro de 1999): 531–37. http://dx.doi.org/10.1115/1.2802507.

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In this research, the friction within the cylinder bore of a swash-plate type axial-piston machine is examined. Unlike previous research, this work develops a mathematical model for the friction based upon lubricating conditions which are described by the well-known Stribeck curve. Furthermore, a test device is built for measuring the frictional characteristics during low pressure and low speed operation and these results are compared with the mathematical model. For high pressure and high speed considerations, a numerical investigation based upon the model is conducted and it is shown that the friction associated with a pumping piston is greater than the friction associated with a motoring piston. It is also shown that increased piston speeds usually reduce the friction within the cylinder bore; however, a “cross-over” condition may exist where the increased speed will actually increase the friction as a result of increased fluid shear. Furthermore, it is shown that speed changes have a more significant impact on motoring pistons as opposed to pumping pistons due to a difference in the location of hydrodynamic lubrication within the cylinder bore. It is noted that this difference exits due to the bore geometry and the direction of piston travel.

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3

Stazhkov, S., A. Kuzmin, V. Elchinskiy e N. Yakovenko. "Tribological tests of the improved piston mechanism of the axial piston hydraulic machine". IOP Conference Series: Materials Science and Engineering 966 (14 de novembro de 2020): 012120. http://dx.doi.org/10.1088/1757-899x/966/1/012120.

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4

Yafei, Lei, Jiang Wanlu, Niu Hongjie, Shi Xiaodong e Yang Xukang. "Fault Diagnosis of Axial Piston Pump Based on Extreme-Point Symmetric Mode Decomposition and Random Forests". Shock and Vibration 2021 (30 de junho de 2021): 1–16. http://dx.doi.org/10.1155/2021/6649603.

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Aiming at fault diagnosis of axial piston pumps, a new fusion method based on the extreme-point symmetric mode decomposition method (ESMD) and random forests (RFs) was proposed. Firstly, the vibration signal of the axial piston pump was decomposed by ESMD to get several intrinsic mode functions (IMFs) and an adaptive global mean curve (AGMC) on the local side. Secondly, the total energy was selected as the data of feature extraction by analyzing the whole oscillation intensity of the signal. Thirdly, the data were preprocessed and the labels were set, and then, they were adopted as the training and testing set of machine learning samples. Lastly, the RFs model was created based on machine learning service (MLS) to diagnose the faults of the axial piston pump on the cloud. Using the test and verifying the data set for comparative testing, the fault diagnosis precision rates of the model are above 90.6%, the recall rates are more than 90.9%, the F1 score is higher than 90.7%, and the accuracy rate of this model reached 97.14%. A benchmark data simulation of mechanical transmission systems and an experimental data investigation of an axial piston pump are performed to manifest the superiority of the present method by comparing with classification and regression trees (CART) and support vector machine (SVM).

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5

Ernst, Meike, Andrea Vacca, Monika Ivantysynova e Georg Enevoldsen. "Tailoring the Bore Surfaces of Water Hydraulic Axial Piston Machines to Piston Tilt and Deformation". Energies 13, n.º 22 (17 de novembro de 2020): 5997. http://dx.doi.org/10.3390/en13225997.

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A novel virtual prototyping algorithm has been developed to design one of the most critical lubricating interfaces in axial piston machines of the swash plate type—the piston–cylinder interface—for operation with water as the working fluid. Due to its low viscosity, the use of water as a lubricant can cause solid friction and wear in these machines at challenging operating conditions. The prototyping algorithm compensates for this by tailoring the shape of the bore surface that guides the motion of each piston in this type of positive displacement machine to conform with the piston surface, taking into account both the piston’s tilt and its deformation. Shaping these surfaces in this manner can render the interface more conducive to generating hydrodynamic pressure buildup that raises its load-carrying capacity. The present work first outlines the structure of the proposed algorithm, then presents a case study in which it is employed to design a bore surface shape for use with two prototypes, one virtual and one physical—both modified versions of a 444 cc commercial axial piston pump. Experimental testing of the physical prototype shows it to achieve a significantly higher maximum total efficiency than the stock unit.

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6

Kuz'min, A. O., V. V. Popov e S. M. Stazhkov. "Hydrodynamic processes in the piston and cylinder unit of axial-piston hydraulic machines". Journal of «Almaz – Antey» Air and Space Defence Corporation, n.º 4 (30 de dezembro de 2017): 86–90. http://dx.doi.org/10.38013/2542-0542-2017-4-86-90.

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The purpose of the research was to analyze the kinematics of the piston mechanism of an axial-piston hydraulic machine with an adjustable-angle cam plate. The kinematic analysis resulted in establishing various types of relative motion of the piston in the guide bushing, writing and solving Reynolds equation with respect to velocities. A sweep method was used to construct a pressure field in the working fluid layer between the piston and the guide bushing. Pressure fields are constructed for several cases of kinematics of the piston mechanism.

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7

Kibakov, Oleksandr, Yuriy Khomyak, Stanislav Medvedev, Ilya Nikolenko e Victoria Zheglovа. "Endurance limit of the axial-piston hydraulic machine cylinder block". Diagnostyka 21, n.º 1 (21 de janeiro de 2020): 71–79. http://dx.doi.org/10.29354/diag/116691.

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8

Chacon, Rene, e Monika Ivantysynova. "Virtual Prototyping of Axial Piston Machines: Numerical Method and Experimental Validation". Energies 12, n.º 9 (2 de maio de 2019): 1674. http://dx.doi.org/10.3390/en12091674.

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This article presents a novel methodology to design swash plate type axial piston machines based on computationally based approach. The methodology focuses on the design of the main lubricating interfaces present in a swash plate type unit: the cylinder block/valve plate, the piston/cylinder, and the slipper/swash plate interface. These interfaces determine the behavior of the machine in term of energy efficiency and durability. The proposed method couples for the first time the numerical models developed at the authors’ research center for each separated tribological interface in a single optimization framework. The paper details the optimization procedure, the geometry, and material considered for each part. A physical prototype was also built and tested from the optimal results found from the numerical model. Tests were performed at the authors’ lab, confirming the validity of the proposed method.

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9

Wei, Shi Yang, Guang Zhen Cheng, Zhe Tong, Jia Hang Ma, Yan Chun Gu e Qi Feng You. "Structure Optimization Design about the Wet Grinding Sanding Machine with Double Cooling System". Applied Mechanics and Materials 685 (outubro de 2014): 208–11. http://dx.doi.org/10.4028/www.scientific.net/amm.685.208.

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This paper introduced a wet grinding sanding machine, it is used for fine material. The machine was consists of three parts by stirring grated agencies, cooling system, material handling systems. Rotor and its Rod pin using the whole cast structure, low cost, conical rod pin to improve bending strength. Annular space between the cylinder and the cylinder liner formed cylinder cooling water channel, it connected respectively inlet and return pipes. Hollow spindle, inner pipe, pipe joint and rotor cavity form rotor cooling water channel, dual cooling effect is good. Shell fixed to the cylinder, turn the handle nut, interaction between the thread and the external thread on the piston, forces the pistons to axial movement, used to adjust the working volume and pressure of sanding machine.

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10

Manring, Noah D. "Tipping the Cylinder Block of an Axial-Piston Swash-Plate Type Hydrostatic Machine". Journal of Dynamic Systems, Measurement, and Control 122, n.º 1 (3 de outubro de 1997): 216–21. http://dx.doi.org/10.1115/1.482445.

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Tipping the cylinder block within an axial-piston swash-plate type hydrostatic machine is a phenomenon that results in a momentary and sometimes permanent failure of the machine since the fluid communication between the cylinder block and the valve plate is instantaneously lost. The efforts of this research are to identify the physical contributors of this phenomenon and to specify certain design guidelines that may be used to prevent the failure of cylinder block tipping. This research begins with the mechanical analysis of the machine and presents a tipping criterion based upon the centroidal location of the force reaction between the cylinder block and the valve plate. This analysis is followed by the derivation of the effective pressurized area within a single piston bore and the cylinder block balance is defined based upon this result. Using standard control volume analysis, the pressure within a single piston bore is examined and it is shown that an approximate pressure profile may be used in place of the more complex representation for this same quantity. Based upon the approximate pressure profile a design criterion is presented which ensures that the pressures within the system never cause the cylinder block to tip. Furthermore, if this criterion is satisfied, it is shown that the worst tipping conditions exist when the system pressures are zero and therefore a criterion governing the design of the cylinder block spring is presented based upon the inertial forces that contribute to the tipping failure. [S0022-0434(00)00901-1]

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11

Nikolenko, I. V., Yu M. Khomyak, V. M. Zheglova, O. G. Kibakov e S. O. Medvedev. "The design of responsible details of an axial piston hydraulic machine improving". IOP Conference Series: Earth and Environmental Science 408 (14 de janeiro de 2020): 012006. http://dx.doi.org/10.1088/1755-1315/408/1/012006.

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12

SHANG, Lizhi, e Monika IVANTYSYNOVA. "Thermodynamic Analysis on Compressible Viscous Flow and Numerical Modeling Study on Piston/Cylinder Interface in Axial Piston Machine". JFPS International Journal of Fluid Power System 11, n.º 3 (2019): 117–23. http://dx.doi.org/10.5739/jfpsij.11.117.

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13

Jiang, Wanlu, Zhenbao Li, Jingjing Li, Yong Zhu e Peiyao Zhang. "Study on a Fault Identification Method of the Hydraulic Pump Based on a Combination of Voiceprint Characteristics and Extreme Learning Machine". Processes 7, n.º 12 (1 de dezembro de 2019): 894. http://dx.doi.org/10.3390/pr7120894.

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Aiming at addressing the problem that the faults in axial piston pumps are complex and difficult to effectively diagnose, an axial piston pump fault diagnosis method that is based on the combination of Mel-frequency cepstrum coefficients (MFCC) and the extreme learning machine (ELM) is proposed. Firstly, a sound sensor is used to realize contactless sound signal acquisition of the axial piston pump. The wavelet packet default threshold denoises the original acquired sound signals. Afterwards, windowing and framing are added to the de-noised sound signals. The MFCC voiceprint characteristics of the processed sound signals are extracted. The voiceprint characteristics are divided into a training sample set and test sample set. ELM models with different numbers of neurons in the hidden layers are established for training and testing. The relationship between the number of neurons in the hidden layer and the recognition accuracy rate is obtained. The ELM model with the optimal number of hidden layer neurons is established and trained with the training sample set. The trained ELM model is applied to the test sample set for fault diagnosis. The fault diagnosis results are obtained. The fault diagnosis results of the ELM model are compared with those of the back propagation (BP) neural network and the support vector machine. The results show that the fault diagnosis method that is proposed in this paper has a higher recognition accuracy rate, shorter training and diagnosis times, and better application prospect.

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14

Haidak, Gaston, Dongyun Wang e Esther Lisiane Ekemeyong Awong. "Modelling of deformation and failure of slipper-retainer assembly in axial piston machine". Engineering Failure Analysis 111 (abril de 2020): 104490. http://dx.doi.org/10.1016/j.engfailanal.2020.104490.

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15

Fang, Yi, e Masataka Shirakashi. "Mixed Lubrication Characteristics Between the Piston and Cylinder in Hydraulic Piston Pump-Motor". Journal of Tribology 117, n.º 1 (1 de janeiro de 1995): 80–85. http://dx.doi.org/10.1115/1.2830610.

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This paper presents a method for evaluating the lubrication characteristics between the piston and cylinder in a swash-plate type axial piston pump-motor under mixed lubrication conditions. A numerical analysis is carried out in order to obtain the metal contact force between the piston and cylinder, and the contact ratio λ is shown to represent the mixed lubrication condition both for the pump and the motor strokes. The contact ratio, λ, is also obtained experimentally by detecting electric resistance between the piston and cylinder in a practical swash-plate type machine. The experimental result is expressed by a relationship between λ and SO (the ratio of dynamic pressure to supply pressure) as indicated by the numerical analysis. In conclusion, the mixed lubrication characteristics between the piston and cylinder in a swash-plate type pump-motor is expressed by λ−SO curve irrespective of the operating conditions such as the supply pressure or the rotation speed.

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16

Manring, Noah D. "The Control and Containment Forces on the Swash Plate of an Axial-Piston Pump". Journal of Dynamic Systems, Measurement, and Control 121, n.º 4 (1 de dezembro de 1999): 599–605. http://dx.doi.org/10.1115/1.2802522.

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In this research, the control and containment forces and moments acting on the swash plate of an axial-piston pump are examined. From a practical standpoint, swash plate control and containment devices take on many different designs; however, they must all resist the same essential moments and forces that attempt to dislocate the swash plate from its proper position. By considering the basic machine design without its control and containment mechanisms, this work generally derives the needed forces and moments for insuring proper swash-plate motion and thereby gives the designer of these machines a useful tool for designing control and containment devices of any type. The success of the actual control and containment devices will be measured by how well they exert the proper forces and moments on the swash plate which are presented here.

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17

Wang, Bin, Shi Long Chen e Zhi Feng Ye. "Experimental Analysis on Oil Film Properties of Plane Port Pair in Axial Piston Machine". Advanced Materials Research 681 (abril de 2013): 169–74. http://dx.doi.org/10.4028/www.scientific.net/amr.681.169.

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To find some rules keeping good lubrication condition for plane port pair in high-performance axial piston pump or motor, especially in the very severe applications, a new test rig was built up to simulate the operational principle of port pair, and to form the lubricating oil film for representative parameter acquisition. This rig is principally characterized by supply pressure up to 30 MPa, accurate control of oil film thickness by separate oil circuit design and electrohydraulic feedback control. The tested oil film working properties was analyzed by comparison with theoretical or simulation references. Experiments show that film balance time and thickness are two key parameters for describing oil film properties, and that working condition factors such as supply pressure, lubricating fluid temperature also notably affects the film thickness and its configuration, but they don’t show equivalent action. Lubrication effects can be valued by the tested frictional torque change of port pair.

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18

Larchikov, Ilya, Andrey Yurov, Sergey Stazhkov, Anastasia Grigorieva e Alena Protsuk. "Power Analysis of an Axial Piston Hydraulic Machine of Power-intensive Hydraulic Drive System". Procedia Engineering 69 (2014): 512–17. http://dx.doi.org/10.1016/j.proeng.2014.03.020.

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19

Lan, Yuan, Jinwei Hu, Jiahai Huang, Linkai Niu, Xianghui Zeng, Xiaoyan Xiong e Bing Wu. "Fault diagnosis on slipper abrasion of axial piston pump based on Extreme Learning Machine". Measurement 124 (agosto de 2018): 378–85. http://dx.doi.org/10.1016/j.measurement.2018.03.050.

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20

Zhang, Jin, Xiaogang Qiu, Xuezhi Gong e Xiangdong Kong. "Wear behavior of friction pairs of different materials for ultra-high-pressure axial piston pump". Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 233, n.º 5 (22 de dezembro de 2018): 945–53. http://dx.doi.org/10.1177/0954408918820728.

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This paper evaluates the wear of two different materials (ceramic and 30Cr2MoVA) of friction pairs of ultra-high-pressure axial piston by means of experimental investigations. Face sliding wear test was carried out on wear testing machine to analyze the coefficient of friction during boundary friction. Then wear amount of the sample is obtained by weighing with the electronic balance. The change of the surface morphology was observed by a laser confocal microscope. By comparing the friction coefficient, wear amount, surface morphology, temperature change, and roughness of the two samples, it has been found that ceramic materials have lower friction coefficient, better wear resistance, and less oil temperature rise than 30Cr2MoVA material. By the above research results it was found that ceramic materials perform better than 30Cr2MoVA, which provides the foundation for further study of the friction pair of the ultra-high-pressure axial piston pump.

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21

Shang, Lizhi, e Monika Ivantysynova. "Scaling Criteria for Axial Piston Machines Based on Thermo-Elastohydrodynamic Effects in the Tribological Interfaces". Energies 11, n.º 11 (19 de novembro de 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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22

Achten, Peter A. J., Titus L. van den Brink e Jeroen W. Potma. "Movement of the Cups on the Barrel Plate of a Floating Cup, Axial Piston Machine". International Journal of Fluid Power 5, n.º 2 (janeiro de 2004): 25–33. http://dx.doi.org/10.1080/14399776.2004.10781189.

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23

Manring, Noah D., e Zhilin Dong. "The Impact of Using a Secondary Swash-Plate Angle Within an Axial Piston Pump". Journal of Dynamic Systems, Measurement, and Control 126, n.º 1 (1 de março de 2004): 65–74. http://dx.doi.org/10.1115/1.1648313.

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In this paper, the control and containment forces acting on the swash plate of an axial-piston pump are examined. The most novel aspect of this research is that it includes the analysis of a secondary swash-plate angle that is occasionally used in aerospace pump applications. From a practical standpoint, swash-plate control and containment devices take on many different designs; however, they must all resist the same essential moments and forces that attempt to dislocate the swash plate from its proper position. By considering the basic machine design without its control and containment mechanisms, this work generally derives the needed forces and moments for insuring proper swash plate motion and thereby gives the designer of these machines a useful tool for designing control and containment devices of any type. In this research, the dynamic characteristics of the control and containment forces are studied by deriving instantaneous and average equations of motion for the swash plate. Results from this analysis are generated by holding the pump speed and discharge pressure constant, and by prescribing a typical second-order response for the primary swash plate angle. In conclusion, it is shown that the primary advantage of implementing a secondary swash-plate angle is that it can be used to reduce the overall control effort of the pump. Disadvantages of using the secondary swash-plate angle are associated with additional containment requirements for the swash plate.

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24

Li, Jingxiang, Xingwang Meng, Peng Dong e Shengdun Zhao. "Design and analysis of an axial flux permanent magnet motor for the direct drive radial piston pump". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, n.º 19-20 (25 de agosto de 2019): 7077–88. http://dx.doi.org/10.1177/0954406219869970.

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Direct drive motor-pumps have attracted a lot of attention from researchers because of high efficiency and compact structure. This paper presents a new type of direct drive motor-pump, which integrates the structure of the radial piston pump and axial-flux permanent-magnet machine. The rotor of the disc motor is fixedly connected to the pump rotor, and the new pump uses a new type of distribution shaft for oil distribution. This structure reduces the intermediate transmission mechanism, and the application of the disc motor further reduces the axial size, the overall volume, and heat dissipation. The efficiency of the entire system has been improved. The three-dimensional finite element method is used to dynamically analyze flow field in the flow channel, which is extracted and simplified. The flow and pressure of the pump meet the design requirements in the simulation. A disc motor was designed for the pump, and the theoretical formula of the disc motor was derived. The initial size of the motor was obtained. The response surface method and three-dimensional finite element are used to optimize the corresponding axial-flux permanent-magnet machine. Loading the torque condition of the pump to the load end of the motor, the response of the motor meets the requirements.

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25

Zhabin, A. B., I. M. Lavit, A. V. Polyakov e Z. E. Kerimov. "Mathematical model of piston-tool interaction in rock fracture by impact". Mining informational and analytical bulletin, n.º 7 (20 de junho de 2020): 94–103. http://dx.doi.org/10.25018/0236-1493-2020-7-0-94-103.

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The authors justify a computation model of a machine percussion system simulated by elastic cylindrical rods subjected to maximal axial load at minimal strain. Rock mass is assumed as a perfectly solid block. The piston and tool are described by the values of length, cross-section area, density and Young’s modulus. The model determines the force applied by the tool on the rock as function of time. It is assumed that transverse displacements and velocities of the rods are negligeable as compared with the axial displacements and velocities, while the rods are free from the action of the external forces different from the restraining forces. The variational equation expresses the principle of possible displacements. The variations are independent of time. The initial and boundary conditions are considered. The variational equation is solved using the method of straight lines, with replacement of a time differentiation operator by the finite difference operator. The problem reduces to the successive solving of boundary value problems with variable right-hand sides. The finite difference scheme is the approved implicit scheme of Crank-Nicolson. The boundary value problems are solved using the finite element method at each step of integrating. As a result, the variational equation transforms into a system of linear algebraic equations, and the reduced solution of this system yields the wanted force. The calculations are illustrated by the tool press force-time curve plotted with a step of 0.1 µs for hydropercussion machine G100 by Rammer, Finland. The relative calculation error of the impact duration and maximal force (in absolute magnitude) is not higher than 0.1%.

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Casoli, Paolo, Mirko Pastori, Fabio Scolari e Massimo Rundo. "Active Pressure Ripple Control in Axial Piston Pumps through High-Frequency Swash Plate Oscillations—A Theoretical Analysis". Energies 12, n.º 7 (10 de abril de 2019): 1377. http://dx.doi.org/10.3390/en12071377.

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Pressure ripple has always been a major drawback in hydraulic circuits, since it is the main source of the overall noise emitted by the pump. This article presents a theoretical analysis on the active control of the pressure ripple in an axial piston pump by properly moving the swash plate. The reduction of the pressure oscillations is studied in an active way and for this purpose a mathematical model of the whole pump has been developed, focusing on both the fluid dynamic aspects and the component dynamics. An experimental activity has been performed in order to validate the pump mathematical model. The results of the simulation, compared with the experimental data, highlight a suitable capability of the model to predict both the dynamics of the swash plate and the delivery pressure ripple. The validated model has been used for implementing an active control of the pressure ripple with the aim of properly modifying the machine displacement at high frequency in order to vary the instantaneous delivery flow rate and, consequently, the outlet pressure. The control strategy is grounded on moving the swash plate for modifying the motion law of the pistons through a servo valve integrated into the displacement control system. The simulations results have demonstrated that acting on the pump displacement control is possible to considerably reduce the amplitude of the pressure oscillations.

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Manring, N. D. "The Torque on the Input Shaft of an Axial-Piston Swash-Plate Type Hydrostatic Pump". Journal of Dynamic Systems, Measurement, and Control 120, n.º 1 (1 de março de 1998): 57–62. http://dx.doi.org/10.1115/1.2801322.

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Traditionally, the theoretical torque on the input shaft of a hydrostatic pump has been determined using a macroscopic “power-in, power-out” approach that neglects the time-varying aspects of this quantity and the compressibility of the hydraulic fluid within the circuit. In contrast to the traditional approach, this research analyzes and sums the basic forces within the machine to compute the instantaneous torque exerted on the shaft. It is shown that the instantaneous torque repeatedly varies by 1.5 percent of its maximum value and that resonant frequencies of the pump occur at even multiples of the “piston-pass” frequency. Furthermore, an integral average of the instantaneous torque is performed and shown to deviate by a maximum of 3 percent from the traditional method of computing this quantity.

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28

Xia, Shiqi, Junhui Zhang, Shaogan Ye, Bing Xu, Weidi Huang e Jiawei Xiang. "A Spare Support Vector Machine Based Fault Detection Strategy on Key Lubricating Interfaces of Axial Piston Pumps". IEEE Access 7 (2019): 178177–86. http://dx.doi.org/10.1109/access.2019.2958141.

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29

Özmen, Özkan, Cem Sınanoğlu, Turgay Batbat e Ayşegül Güven. "Prediction of Slipper Pressure Distribution and Leakage Behaviour in Axial Piston Pumps Using ANN and MGGP". Mathematical Problems in Engineering 2019 (4 de março de 2019): 1–13. http://dx.doi.org/10.1155/2019/7317520.

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The pressure distribution (PD) and leakage between the slipper and swash plate in an axial piston pump (APP) have a considerable impact on the pump efficiency, affecting aspects such as the load bearing and wear performance of the slipper. Herein, multigene genetic programming (MGGP) and artificial neural network (ANN) machine learning methods (MLMs) are incorporated into a novel approach towards predictive modelling of the PD and leakage on the slipper, which can function hydrostatically/hydrodynamically. Experimentally measured data are used as input for the MGGP and ANN models. The validity of the MGGP and ANN models is verified using test data excluded from the analyses. In addition, the model results are compared with analytic equations (AEs). Both MLMs are found to exhibit strong agreement with the measured data. In particular, the ANN model exhibits superior prediction performance to the MGGP model and AEs.

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Miao, Yang, Yuncheng Jiang, Jinfeng Huang, Xiaojun Zhang e Lei Han. "Application of Fault Diagnosis of Seawater Hydraulic Pump Based on Transfer Learning". Shock and Vibration 2020 (10 de dezembro de 2020): 1–8. http://dx.doi.org/10.1155/2020/9630986.

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The working environment of seawater axial piston hydraulic pump is harsh, and it is difficult to diagnose due to insufficient fault database. In contrast, pumps of the same type but using hydraulic oil have an adequate fault database and are easy to diagnose. In view of the above situation, a fault diagnosis method of seawater hydraulic piston pump based on transfer learning is proposed. The method decomposes the original sampled fault signal by complementary ensemble empirical mode decomposition (CEEMD) to obtain the intrinsic mode function (IMF) that can characterize the original signal. The singular value decomposition (SVD) is performed on the IMF. Then, the obtained singular value is used as a feature parameter to construct a feature vector. The feature data of seawater hydraulic pump and oil pump are used as target data and auxiliary data to form training data. The training data is trained based on the iterative adjustment of the weight through the TrAdaBoost transfer learning algorithm. Finally, the results of diagnosis and classification are compared with traditional machine learning. When the number of training data is 5 groups, the accuracy of transfer learning is 30.5% higher than that of traditional machine learning. The results show that transfer learning has great advantages in the case of a small number of samples.

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31

Górecki, Jan, Ireneusz Malujda e Dominik Wilczyński. "The influence of geometrical parameters of the forming channel on the boundary value of the axial force in the agglomeration process of dry ice". MATEC Web of Conferences 254 (2019): 05001. http://dx.doi.org/10.1051/matecconf/201925405001.

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The article presents the results of study on the influence of geometrical parameters of the forming channels on axial force which is the main parameter of the agglomeration process of dry ice in the piston method. During research, the material was agglomerated utilizing different dies. The material is characterized by low temperature and sublimation under standard environmental conditions. The study focuses on determining the influence of geometrical parameters of the conical and cylindrical sections of the forming chamber which influence the value of yield stress in the carbon dioxide agglomeration process. The determination of the value of boundary force is the basis for formulating the construction assumptions which shall be the basis for designing and constructing the dry ice compaction and pelletization machine.

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32

Manring, Noah D. "Designing the Shaft Diameter for Acceptable Levels of Stress Within an Axial-Piston Swash-Plate Type Hydrostatic Pump". Journal of Mechanical Design 122, n.º 4 (1 de julho de 1999): 553–59. http://dx.doi.org/10.1115/1.1313827.

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In this research, the diameter of the shaft within an axial-piston swash-plate type hydrostatic pump is considered from a stress point of view. To analyze the loading of the shaft, the components within the pump are studied using a force and torque diagram and it is shown that the loads are applied differently for three main sections of the shaft. From the force and torque diagram, the actual shaft loads are determined based upon the geometry of the pump and the working pressure of the hydraulic system. Using well-accepted machine design practices, governing equations for the shaft diameter are produced for the various regions of loading along the shaft. These equations consider both bending and torsional stresses on the outer surface of the shaft. Results for the required shaft diameter are then computed for a typical pump design and compared to the geometry of an actual shaft. It is noted that stress concentrations can significantly alter these results and that the required shaft diameter can be reduced by applying the proper heat treatments and increasing the shaft strength. Finally, the designer is cautioned regarding the deflection difficulties that can arise when the shaft diameter is reduced too much. [S1050-0472(00)01704-9]

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33

Li, Zhenbao, Wanlu Jiang, Sheng Zhang, Yu Sun e 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, n.º 8 (7 de abril de 2021): 2599. http://dx.doi.org/10.3390/s21082599.

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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.

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Kou, Baofu, Zhenshun Li, Zhang Zhang e Ruiqing Li. "Tribological Properties of ZrO2 Coating on the Ball Joint of an Axial Piston Pump in High Water-Based Emulsion Medium". Mathematical Problems in Engineering 2021 (29 de abril de 2021): 1–16. http://dx.doi.org/10.1155/2021/9978006.

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This paper studies the tribological properties of the ZrO2-coated spherical joint pair of the axial piston pump in a high water-based emulsion medium. Firstly, atmospheric plasma spraying was used to prepare the ZrO2 coating on the surface of the spherical joint pair. Secondly, the tribological characteristics of the steel-steel pair and ceramic-ceramic pair were analyzed by the friction and wear testing machine under the conditions of a high water-based emulsion concentration, load size, and load frequency. White light interference three-dimensional surface profiler and scanning electron microscope were used to analyze the original and worn surfaces of the samples, and then the friction and wear of the different material pairs were discussed. The results show that the friction reduction and wear resistance of the ceramic ball joint are superior to those of the steel ball joint. When the load is 100 N, the frequency is 1 Hz, and the emulsion concentration is 5%, and the friction coefficient and wear loss of the ceramic-ceramic ball joint pair are the lowest. The emulsion concentration and load have great influence on the friction coefficient and wear amount, while the frequency has little influence on them. With increasing concentration of the emulsion, the friction coefficient decreases and tends to be stable, but with increasing of load, the friction coefficient and wear increase. The friction coefficient and wear loss of the ceramic-ceramic ball joint in pure water are 0.25 times higher than those of the steel ball joint under the same working conditions. Therefore, when the concentration of the high water-based emulsion is 5%, 100 N load, 1 Hz frequency, the ceramic-ceramic ball joints display the best friction and wear resistance of the two. The research results provide a theoretical basis for the design, manufacture, and application of the ceramic coating hydraulic components in a high water-based emulsion medium.

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35

KAZAMA, Toshiharu, e Hayato SASAKI. "Thermal Lubrication Characteristics of Swash-Plate Type Axial Piston Pumps : Simultaneous Measurement of Temperatures in Cylinder-Block, Swash-Plate and Valve-Plate(Machine Elements, Design and Manufacturing)". Transactions of the Japan Society of Mechanical Engineers Series C 75, n.º 758 (2009): 2797–802. http://dx.doi.org/10.1299/kikaic.75.2797.

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36

Elashmawy, Mohamed. "Design of Swashplate Axial Piston Machines Having Low Piston Transverse Forces". International Journal of Mechanical Engineering and Applications 3, n.º 1 (2015): 17. http://dx.doi.org/10.11648/j.ijmea.s.2015030102.13.

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37

Zhou, Junjie, Chongbo Jing, Qianqian Bao e Wei Wu. "Novel study on the pressure pulsation of the axial piston machines with even number of pistons". Journal of Engineering 2020, n.º 14 (1 de novembro de 2020): 932–35. http://dx.doi.org/10.1049/joe.2020.0046.

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38

Elashmawy, Mohamed. "Computer Aided Design of Axial Piston Machines Having a Roller Piston Bearing". International Journal of Mechanical Engineering and Applications 3, n.º 1 (2015): 24. http://dx.doi.org/10.11648/j.ijmea.s.2015030102.14.

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39

Shang, Lizhi, e Monika Ivantysynova. "A temperature adaptive piston design for swash plate type axial piston machines". International Journal of Fluid Power 18, n.º 1 (27 de julho de 2016): 38–48. http://dx.doi.org/10.1080/14399776.2016.1213115.

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40

Pelosi, Matteo, e Monika Ivantysynova. "A Geometric Multigrid Solver for the Piston–Cylinder Interface of Axial Piston Machines". Tribology Transactions 55, n.º 2 (março de 2012): 163–74. http://dx.doi.org/10.1080/10402004.2011.639049.

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Kuzmin, A. O., S. M. Stazhkov, N. V. Tarasova e P. I. Valikov. "Fractional step method in problems of hydromechanical processes in piston-cylinder unit of axial piston swash plate hydraulic machines". Journal of «Almaz – Antey» Air and Space Defence Corporation, n.º 4 (30 de dezembro de 2019): 60–66. http://dx.doi.org/10.38013/2542-0542-2019-4-60-66.

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Having analyzed the piston-cylinder unit kinematics, we obtained an equation for the clearance height in the piston-cylinder unit for the case of low speeds, the equation being the basis for Reynolds equation for the lubricant layer of the piston mechanism. By a numerical experiment using the fractional step method, we built a pressure field for two different cases of the piston mechanism kinematics, and compared the bearing capacity of the hydrodynamic force. It was revealed analytically and with the help of a numerical experiment that when the piston rolls in the edges of the guide bushing, the total hydrodynamic force significantly exceeds the force created when the piston slides in the bushing.

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42

Jeong, Heon-Sul, e Hyoung-Eui Kim. "On the instantaneous and average piston friction of swash plate type hydraulic axial piston machines". KSME International Journal 18, n.º 10 (outubro de 2004): 1700–1711. http://dx.doi.org/10.1007/bf02984318.

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43

Tkach, Vyacheslav. "INFLUENCE OF WORKING FLUID VISCOSITY ON LUBRICATION MODE OF HYDRAULIC UNITS OF CONSTRUCTION MACHINES". Globus: technical sciences 7, n.º 3(39) (19 de agosto de 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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44

SCHOEMACKER, Florian, e Hubertus MURRENHOFF. "Interaction Between Swash Plate Movement And Commutation In Axial Piston Machines". JFPS International Journal of Fluid Power System 11, n.º 3 (2019): 49–54. http://dx.doi.org/10.5739/jfpsij.11.49.

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45

Seeniraj, Ganesh Kumar, e Monika Ivantysynova. "Multi-objective Optimization Tool for Noise Reduction in Axial Piston Machines". SAE International Journal of Commercial Vehicles 1, n.º 1 (7 de outubro de 2008): 544–52. http://dx.doi.org/10.4271/2008-01-2723.

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46

GÄRTNER, Markus, Filipp KRATSCHUN e Hubertus MURRENHOFF. "Analytical, Experimental and Numerical Methods to Quantify the Pressurization on the Piston Chamber of Axial Piston Machines". JFPS International Journal of Fluid Power System 11, n.º 3 (2019): 97–103. http://dx.doi.org/10.5739/jfpsij.11.97.

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Babak, Vitalii, e Viatcheslav Stadnychenko. "APPLICATION OF REVITALISANTS FOR EXTENSION OF RESOURCE AND RESTORING WORN‐OUT FRICTION UNITS OF AVIATION AXIAL ‐ PISTON HYDROMACHINES". Aviation 8, n.º 1 (31 de março de 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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48

Enekes, Claus, e Hubertus Murrenhoff. "How Environmentally Friendly Tribological Systems Influence the Efficiency of Axial Piston Machines". Tribology Online 5, n.º 5 (2010): 245–49. http://dx.doi.org/10.2474/trol.5.245.

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49

Chiang, Mao Hsiung, Chung Chieh Cheng, Liang Wang Lee, Maoh Chin Jiang e Jhih Hong Lin. "Signed-Distance Fuzzy Sliding Mode Position Control for an Energy-Saving Electro-Hydraulic Control System". Applied Mechanics and Materials 284-287 (janeiro de 2013): 2315–19. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.2315.

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Electro-Hydraulic pump-controlled servo systems that have high energy-efficiency can serve as energy-saving system. This paper aims to investigate the servo performance of the electro-hydraulic pump-controlled systems driven by an AC servo motor with variable rotational speed. A constant displacement axial piston pump is used in this research. Thus, the new hydraulic pump-controlled system with an AC motor servo and a constant displacement axial piston pump is investigated for position control of hydraulic servo machines. For that, this paper also develops the control strategy, sign-distance fuzzy sliding mode control, which can simplify the fuzzy rule base through the sliding surface. The developed high response variable rotational speed pump-controlled systems controlled by SD-FSMC are implemented and verified experimentally for positioning control in different stroke and loading conditions.

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50

Górecki, Jan, Ireneusz Malujda, Dominik Wilczyński e Dominik Wojtkowiak. "Influence of the face surface shape of the piston on the limit value of compaction stress in the process of dry ice agglomeration". MATEC Web of Conferences 254 (2019): 06001. http://dx.doi.org/10.1051/matecconf/201925406001.

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This paper presents the results of research on improving the efficiency of the mechanical agglomeration through describing the influence of the shape of the piston pressure face on the limit force value. The focus of this study is the geometrical parameters which are describing the shape of the piston pressure face. Where these parameters influence on the value of the limit stress in the process of mechanical agglomeration of crystallized carbon dioxide. The first part of the paper proposes a model describing the influence of the geometric parameters of the piston pressure face on the value of axial force during the subsequent compression phase of the process. The research part of the paper presents the empirical research results to verify the proposed model. The results of the work will be used to determine the influence of the described geometrical parameters of the dry ice residue on the axial force value. The derived mathematical model will be used for defining the design requirements as the starting point for the design and building of dry ice compression and granulation machines.

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