Relevant bibliographies by topics / Axial-piston hydraulic machines

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Axial-piston hydraulic machines'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Axial-piston hydraulic machines.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Axial-piston hydraulic machines"

1

Burumkulov, F. Kh, P. A. Ionov, A. V. Stolyarov, and A. P. Senin. "A new technology of axial-piston hydraulic machines repair." Traktory i sel hozmashiny 79, no. 9 (September 15, 2012): 50–53. http://dx.doi.org/10.17816/0321-4443-69497.

Full text
Abstract:
Problems of the axial-piston hydraulic machines repair, findings of investigation of parts and their joinings wear are considered. Degree of their influence on the hydraulic pump efficiency coefficient is ascertained. Recommendations on service life determinant parts renewal were developed.
APA, Harvard, Vancouver, ISO, and other styles
2

Soloviov, R. Yu, A. O. Kapustkin, and I. M. Makarkin. "Methods of diagnostics of nonadjustable axial-piston hydraulic machines." Traktory i sel hozmashiny 80, no. 5 (May 15, 2013): 42–45. http://dx.doi.org/10.17816/0321-4443-65891.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Avrunin, Grygoriy, Valery Shevchenko, Dmitriy Shevchenko, Oleg Shcherbak, Igor Pimonov, and Irina Moroz. "Analysis of the characteristics of axial-piston hydraulic machines for drives for maintenance of airfields and planes." Bulletin of Kharkov National Automobile and Highway University, no. 95 (December 16, 2021): 15. http://dx.doi.org/10.30977/bul.2219-5548.2021.95.0.15.

Full text
Abstract:
Is an integral part of the development of the concept of forming a standard range of transport and technological hydrophilic modular means for maintenance of airfields and aircraft. Goal. Development of scientifically sound recommendations for determining the rational parameters of the hydraulic system with automation of control and energy saving during operation of modular vehicles for maintenance of airfields and aircraft, taking into account the potential of domestic engineering and critical imports of units. Methodology. Analysis of the development of axial-piston pumps and motors according to the manufacturers' catalogs taking into account the needs of modular vehicles for maintenance of airfields and aircraft, in particular, taking into account the creation of modern hydraulic machines by enterprise «Hydrosila» by increasing pressure, speed and development new regulators. Results. It is established that the domestic nomenclature of modern pumps and motors of axial piston type allows to create three-dimensional hydraulic drives with power to 110 kW for transmissions with machine stepless remote electrohydraulic regulation of speed of rotation of wheels of modular vehicles and to 85 kW throttle drives of technological equipment with energy saving systems by using pumps with automatic regulators of change of working volume. It has been established that in the pumps for of transmissions the ratio of mass to power is reduced three times.Originality. Graphic dependences of power, supply and torque of standard size series on the working volume of axial-piston pumps and hydraulic motors of the domestic enterprise "Hydrosila" for volumetric hydraulic transmissions and technological equipment of aerodrome and aircraft maintenance facilities are constructed. Practical value. The possibility of a rational selection of axial-piston domestic hydraulic machines for the development of hydraulic drives for airfields and aircraft.
APA, Harvard, Vancouver, ISO, and other styles
4

Ernst, Meike, Andrea Vacca, Monika Ivantysynova, and Georg Enevoldsen. "Tailoring the Bore Surfaces of Water Hydraulic Axial Piston Machines to Piston Tilt and Deformation." Energies 13, no. 22 (November 17, 2020): 5997. http://dx.doi.org/10.3390/en13225997.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
5

Kuz'min, A. O., V. V. Popov, and 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, no. 4 (December 30, 2017): 86–90. http://dx.doi.org/10.38013/2542-0542-2017-4-86-90.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
6

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

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
7

Jeong, Heon-Sul, and Hyoung-Eui Kim. "On the instantaneous and average piston friction of swash plate type hydraulic axial piston machines." KSME International Journal 18, no. 10 (October 2004): 1700–1711. http://dx.doi.org/10.1007/bf02984318.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

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.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
9

Baryshev, V. I., and V. V. Panov. "Key deterioration factors of hydrostatic bearings of the axial-piston hydraulic machines." Traktory i sel hozmashiny 80, no. 1 (January 15, 2013): 34–37. http://dx.doi.org/10.17816/0321-4443-65912.

Full text
Abstract:
Formation of porous stoppers in delivery capillaries of hydrostatic bearings and their obliteration are substantiated as secondary factors of bearings deterioration under the impact of working fluids contaminations. Findings of the laboratory investigations are given.
APA, Harvard, Vancouver, ISO, and other styles
10

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.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Axial-piston hydraulic machines"

1

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.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
2

Schleihs, Christian [Verfasser]. "Acoustic Design of Hydraulic Axial Piston Swashplate Machines / Christian Schleihs." Aachen : Shaker, 2017. http://d-nb.info/1138177202/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Бурлига, Михайло Борисович. "Розвиток методів розрахунку та вибір раціональних схем двопотокових безступінчастих гідрооб'ємно-механічних трансмісій колісних тракторів." Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/35538.

Full text
Abstract:
Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.22.02 – автомобілі та трактори. Національний технічний університет "Харківський політехнічний інститут", Харків, 2017. Дисертація присвячена розвитку методів розрахунку для аналізу робочих параметрів безступінчастих ГОМТ і їх основних елементів ГОП, прогнозуванню техніко-економічних показників машинно-тракторного агрегату для визначення раціональних схемних рішень ГОМТ. Актуальність роботи полягає у необхідності забезпечення конкурентоспроможності вітчизняних тракторів. Здійснено аналіз роботи двопотокових ГОМТ колісних тракторів зарубіжних аналогів. Уточнено на підставі новітніх експериментальних даних щодо втрат і ККД математичну модель об’ємних аксіально-поршневих гідромашин, як основних елементів тракторних ГОМТ. Розроблено алгоритм і обчислювальну процедуру щодо встановлення взаємно однозначної відповідності між робочими параметрами, втратами і ККД ГОП в прямому і зворотному потоках потужності крізь ГОП під час їх роботи у складі двопотокових ГОМТ. Вперше розроблено розрахунково-теоретичну методику і програмну реалізацію з визначення параметрів ГОП, ГОМТ і основних техніко-економічних показників МТА з урахуванням режимів циркуляції потужності, втрат в ГОП, ГОМТ і буксування трактора для аналізу і прогнозування характеристик альтернативних тракторних ГОМТ та наукового обґрунтування найраціональнішої трансмісії для конкретного трактора. Вперше вирішено задачу побудови універсальних характеристик тракторів з ГОМТ і візуалізації робочих параметрів ГОМТ у всьому діапазоні експлуатаційних режимів трактора для порівняння альтернативних схемних рішень ГОМТ і вибору найраціональнішого з них. Побудовано універсальні характеристики першого в Україні трактора ХТЗ-21021 з ГОМТ-1С розробки НТУ "ХПІ" і АТ "ХТЗ". За результатами чисельного і натурного експериментів зроблено висновок, що математичні моделі й запропоновані методики є адекватними і спрямованими на підвищення ефективності та конкурентоспроможності вітчизняних тракторів.
Thesis for Scientific degree of candidate of technical sciences, specialty 05.22.02 – vehicles and tractors. National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2017. The work is devoted to solving the technical problem of development of calculation methods and choice of rational schemes of dual path hydraulic volume mechanical transmission (HVMT) wheeled tractors, which allows you to select the optimal scheme HVMT at the design stage. Actuality of work consists in the necessity of providing of competitiveness of Ukraine tractors. The analysis of work of the dual path HVMT tractors of foreign analogues is carried out. Refined mathematical model of hydrostatic axial-piston hydraulic machines as the main HVMT elements identity-based loss coefficients with the latest experimental data loss and coefficient of performance (COP). The algorithm and the computational procedure for the establishment of a oneto-one correspondence between the operating parameters and the efficiency of hydraulic drive system (HDS) losses in forward and reverse flow of power through the HDS for her work in the dual path tractor HVMT. Calculation-theoretical methodology and her programmatic realization is first worked out for determination of HDS parameters, dual path HVMT and basic technical and economic indexes of tractor-aggregate taking into account the modes of circulation of power, losses in HDS, HVMT and skidding of tractor for an analysis and prognostication of descriptions alternative tractor HVMT and scientific ground of the most rational transmission for a certain tractor. The problem of construction of universal descriptions of tractor is first set and decided with dual path HVMT. Original solution of task offers on visualization of kinematics, power and power parameters of dual path HVMT of the perspective Ukrainian tractors in all range of their operating modes as an important criterion for comparison of alternative schematics of HVMT. Universal descriptions of first in Ukraine and on post-soviet space of tractor of XTZ-21021 from stepless HVMT-1S development of NТU "KhPI" and propulsion MODULE of "XTZ" are built. Results numeral and natural experiments allow to draw conclusion, that the calculation-theoretical methodologies and constituents of them worked out in dissertation mathematical models are adequate and directed to on an increase efficiency and competitiveness of the Ukrainian tractors.
APA, Harvard, Vancouver, ISO, and other styles
4

Бурлига, Михайло Борисович. "Розвиток методів розрахунку та вибір раціональних схем двопотокових безступінчастих гідрооб'ємно-механічних трансмісій колісних тракторів." Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/35536.

Full text
Abstract:
Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.22.02 – автомобілі та трактори. Національний технічний університет "Харківський політехнічний інститут", Харків, 2017. Дисертація присвячена розвитку методів розрахунку для аналізу робочих параметрів безступінчастих ГОМТ і їх основних елементів ГОП, прогнозуванню техніко-економічних показників машинно-тракторного агрегату для визначення раціональних схемних рішень ГОМТ. Актуальність роботи полягає у необхідності забезпечення конкурентоспроможності вітчизняних тракторів. Здійснено аналіз роботи двопотокових ГОМТ колісних тракторів зарубіжних аналогів. Уточнено на підставі новітніх експериментальних даних щодо втрат і ККД математичну модель об’ємних аксіально-поршневих гідромашин, як основних елементів тракторних ГОМТ. Розроблено алгоритм і обчислювальну процедуру щодо встановлення взаємно однозначної відповідності між робочими параметрами, втратами і ККД ГОП в прямому і зворотному потоках потужності крізь ГОП під час їх роботи у складі двопотокових ГОМТ. Вперше розроблено розрахунково-теоретичну методику і програмну реалізацію з визначення параметрів ГОП, ГОМТ і основних техніко-економічних показників МТА з урахуванням режимів циркуляції потужності, втрат в ГОП, ГОМТ і буксування трактора для аналізу і прогнозування характеристик альтернативних тракторних ГОМТ та наукового обґрунтування найраціональнішої трансмісії для конкретного трактора. Вперше вирішено задачу побудови універсальних характеристик тракторів з ГОМТ і візуалізації робочих параметрів ГОМТ у всьому діапазоні експлуатаційних режимів трактора для порівняння альтернативних схемних рішень ГОМТ і вибору найраціональнішого з них. Побудовано універсальні характеристики першого в Україні трактора ХТЗ-21021 з ГОМТ-1С розробки НТУ "ХПІ" і АТ "ХТЗ". За результатами чисельного і натурного експериментів зроблено висновок, що математичні моделі й запропоновані методики є адекватними і спрямованими на підвищення ефективності та конкурентоспроможності вітчизняних тракторів.
Thesis for Scientific degree of candidate of technical sciences, specialty 05.22.02 – vehicles and tractors. National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2017. The work is devoted to solving the technical problem of development of calculation methods and choice of rational schemes of dual path hydraulic volume mechanical transmission (HVMT) wheeled tractors, which allows you to select the optimal scheme HVMT at the design stage. Actuality of work consists in the necessity of providing of competitiveness of Ukraine tractors. The analysis of work of the dual path HVMT tractors of foreign analogues is carried out. Refined mathematical model of hydrostatic axial-piston hydraulic machines as the main HVMT elements identity-based loss coefficients with the latest experimental data loss and coefficient of performance (COP). The algorithm and the computational procedure for the establishment of a oneto-one correspondence between the operating parameters and the efficiency of hydraulic drive system (HDS) losses in forward and reverse flow of power through the HDS for her work in the dual path tractor HVMT. Calculation-theoretical methodology and her programmatic realization is first worked out for determination of HDS parameters, dual path HVMT and basic technical and economic indexes of tractor-aggregate taking into account the modes of circulation of power, losses in HDS, HVMT and skidding of tractor for an analysis and prognostication of descriptions alternative tractor HVMT and scientific ground of the most rational transmission for a certain tractor. The problem of construction of universal descriptions of tractor is first set and decided with dual path HVMT. Original solution of task offers on visualization of kinematics, power and power parameters of dual path HVMT of the perspective Ukrainian tractors in all range of their operating modes as an important criterion for comparison of alternative schematics of HVMT. Universal descriptions of first in Ukraine and on post-soviet space of tractor of XTZ-21021 from stepless HVMT-1S development of NТU "KhPI" and propulsion MODULE of "XTZ" are built. Results numeral and natural experiments allow to draw conclusion, that the calculation-theoretical methodologies and constituents of them worked out in dissertation mathematical models are adequate and directed to on an increase efficiency and competitiveness of the Ukrainian tractors.
APA, Harvard, Vancouver, ISO, and other styles
5

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.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
6

(5929562), Rene Chacon Portillo. "VIRTUAL PROTOTYPING OF AXIAL PISTON MACHINES OF SWASH PLATE TYPE." Thesis, 2019.

Find full text
Abstract:
Axial piston machines are widely used in the industry ranging from aerospace, agriculture, automotive, heavy machinery, etc. These applications require better pumps and motors to meet current market demands such as higher power density in hydraulic units, smarter pumps (diagnostics and prognostics), higher efficiencies, and compactness. The current state-of-the-art in pump design is mostly based on heuristic design approach with very limited use of numerical toolssince the invention of this positive displacement machine until the present time. The numerical tools being used do not capture the physical phenomena in the thin fluid film between the rotating group components. The work presented in this dissertation aims to demonstrate the feasibility of virtual prototyping utilizing a combination of in-house developed multi-domain models and to propose a novel computational based design methodology for axial piston machines. The methodology is an iterative process between the virtual components in 3D CAD models and the function evaluations for the design requirements utilizing the numerical models which provide an accurate prediction to the behavior of the mechanical components working together. To validate the proposed methodology a case study on a 24 cc/rev axial piston machine was carried out. The machine was built virtually, simulated,and optimized for desired performance. A physical prototype was built based on the case study and tested successfullyfor forty-five operating conditions.
APA, Harvard, Vancouver, ISO, and other styles
7

(5930255), Lizhi Shang. "A Path Toward an Effective Scaling Approach for Axial Piston Machines." Thesis, 2019.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

(10135868), Meike H. Ernst. "Enabling High-Pressure Operation with Water for the Piston-Cylinder Interface In Axial Piston Machines." Thesis, 2021.

Find full text
Abstract:

Water is inflammable, non-toxic, environmentally friendly--- desirable traits, for a hydraulic fluid. However, its extremely low viscosity diminishes the load-bearing and sealing capacity of lubricating interfaces. Case in point: axial piston machines of swash plate design are compact, highly efficient positive displacement machines at the heart of hydraulic systems in forestry, construction, aerospace, and agricultural equipment, as well as industrial applications (presses, etc.); however, the three main lubricating interfaces decisive to the performance of such units in terms of both component life and efficiency are challenged by the use of water as working fluid. Especially during high-pressure operation, this low-viscosity lubricant can cause the these interfaces to fail in carrying the imposed load, resulting in severe wear, or even pump failure. The piston-cylinder interface is particularly challenging to design for water because it stands under obligation to carry the heavy side load that acts on the pistons of these machines, which increases with operating pressure. Furthermore, the architecture of axial piston machines of swash plate design does not allow this interface to be hydrostatically balanced.

Through the development of a methodology that separates the fluid pressure fields of the three main lubricating interfaces of axial piston machines into their hydrostatic and hydrodynamic components, the present work enables a direct comparison of these interfaces in terms of how they support load. A case study of a 75 cc unit running on hydraulic oil conducted via this methodology at three different operating conditions (low pressure/low speed, low pressure/high speed, and high pressure/low speed) demonstrates that in the piston-cylinder interface, the force from hydrostatic pressure reaches such high magnitudes over the high-pressure stroke that less than half of it is needed to counter the load. The excess force from hydrostatic pressure then becomes the load. Consequentially, hydrodynamic pressure must counter a force from hydrostatic pressure that exceeds the original load. In the other two interfaces, by contrast, over half the load is being carried by hydrostatic pressure, thus significantly diminishing the amount of hydrodynamic pressure the interfaces are required to generate in order to achieve full load support. Moreover, nearly all of the moment on the piston is countered by hydrodynamic pressure, while less than half of the moment on the block is countered by hydrodynamic pressure, and the moment on the slipper is negligible by comparison.

While this case study only investigates one pump, it shows how critical hydrodynamic pressure can be to load support in the piston-cylinder interface. The use of a low-viscosity fluid, e.g. water, reduces the hydrodynamic pressure that is generated in this interface, which, at challenging operating conditions, can lead to metal-to-metal contact. However, the performance of the interface can be improved via micro surface shaping, i.e. by giving the surface of the piston, or the bore that it moves through, a shape on the order of microns in height. The aim of present work is to pursue design trends leading to surface shapes that will enable this interface to function at higher pressures than currently achievable.

This pursuit takes the form of systematic virtual design studies, an optimization procedure, and an algorithm developed specifically for tailoring the bore surfaces through which the pistons travel to piston tilt and deformation. From this emerges not only a set of design trends corresponding to the dimensions of two particularly powerful types of micro surface shaping, but also a profound insight into the behavior of the water-lubricated piston-cylinder interface fluid film, and how that behavior can be manipulated by changing the component surfaces that constitute its borders. Furthermore, in collaboration with Danfoss High Pressure Pumps, a physical prototype of a 444 cc axial piston pump with surface shaping generated via the aforementioned algorithm has been constructed and tested, achieving a total pump efficiency roughly 3% higher than that achievable by the commercial unit that the geometry of the prototype is based on.


APA, Harvard, Vancouver, ISO, and other styles
9

(8770307), Nathan J. Keller. "Condition Monitoring Systems for Axial Piston Pumps: Mobile Applications." Thesis, 2020.

Find full text
Abstract:
Condition monitoring of hydraulic systems has become more available and inexpensive to implement. However, much of the research on this topic has been done on stationary hydraulic systems without the jump to mobile machines. This lack of research on condition monitoring of hydraulic systems on mobile equipment is addressed in this work. The objective of this work is to develop a novel process of implementing an affordable condition monitoring system for axial piston pumps on a mobile machine, a mini excavator in this work. The intent was to find a minimum number of sensors required to accurately predict a faulty pump. First, an expert understanding of the different components on an axial piston pump and how those components interact with one another was discussed. The valve plate was selected as a case study for condition monitoring because valve plates are a critical component that are known for a high percentage of failures in axial piston pumps. Several valve plates with various degrees of natural wear and artificially generated damage were obtained, and an optical profilometer was used to quantify the level of wear and damage. A stationary test-rig was developed to determine if the faulty pumps could be detected under a controlled environment, to test several different machine learning algorithms, and to perform a sensor reduction to find the minimum number of required sensors necessary to detect the faulty pumps. The results from this investigation showed that only the pump outlet pressure, drain pressure, speed, and displacement are sufficient to detect the faulty pump conditions, and the K-Nearest Neighbor (KNN) machine learning algorithms proved to be the least computationally expensive and most accurate algorithms that were investigated. Fault detectability accuracies of 100% were achievable. Next, instrumentation of a mini excavator was shown to begin the next phase of the research, which is to implement a similar process that was done on the stationary test-rig but on a mobile machine. Three duty cycle were developed for the excavator: controlled, digging, and different operator. The controlled duty cycle eliminated the need of an operator and the variability inherent in mobile machines. The digging cycle was a realistic cycle where an operator dug into a lose pile of soil. The different operator cycle is the same as the digging cycle but with another operator. The sensors found to be the most useful were the same as those determined on the stationary test-rig, and the best algorithm was the Fine KNN for both the controlled and digging cycles. The controlled cycle could see fault detectability accuracies of 100%, while the digging cycle only saw accuracies of 93.6%. Finally, a cross-compatibility between a model trained under one cycle and using data from another cycle as an input into the model. This study showed that a model trained under the controlled duty cycle does not give reliable and accurate fault detectability for data run in a digging cycle, below 60% accuracies. This work concluded by recommending a diagnostic function for mobile machines to perform a preprogrammed operation to reliably and accurately detect pump faults.
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Axial-piston hydraulic machines"

1

Maradey Lázaro, Jessica Gissella, and Carlos Borrás Pinilla. "Detection and Classification of Wear Fault in Axial Piston Pumps." In Pattern Recognition Applications in Engineering, 286–316. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1839-7.ch012.

Full text
Abstract:
Variable displacement axial piston hydraulic pumps (VDAP) are the heart of any hydraulic system and are commonly used in the industrial sector for its high load capacity, efficiency, and good performance in the handling of high pressures and speeds. Due to this configuration, the most common faults are related to the wear and tear of internal components, which decrease the operational performance of the hydraulic system and increase maintenance costs. So, through data acquisition such as signals of pressure and the digital processing of them, it is possible to detect, classify, and identify faults or symptoms in hydraulic machinery. These activities form the basis of a condition-based maintenance (CBM) program. This chapter shows the developed methodology to detect and classify a wear fault of valve plate taking into account six conditions and the facilities providing by wavelet analysis and ANNs.
APA, Harvard, Vancouver, ISO, and other styles
2

Stazhkov, S. "Development of an Axial-Piston Hydraulic Machine of a Drive System." In DAAAM International Scientific Book 2013, 277–96. DAAAM International Vienna, 2013. http://dx.doi.org/10.2507/daaam.scibook.2013.12.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Elchinsky, Viktor, Anton Kuzmin, Valery Popov, and Sergey Stazhkov. "Influence of the Design Parameters of the Piston Mechanism on the Dead Band of the Axial-Piston Hydraulic Machine." In DAAAM Proceedings, 0384–90. DAAAM International Vienna, 2020. http://dx.doi.org/10.2507/31st.daaam.proceedings.053.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Elchinsky, Viktor, Branko Katalinic, Anton Kuzmin, and Sergey Stazhkov. "Investigation of the Operation of the Developed Piston Mechanism of the Axial-Piston Hydraulic Swash Plate Machine in the Straining and Creeping Speeds Modes." In Proceedings of the 32nd International DAAAM Symposium 2021, 0454–61. DAAAM International Vienna, 2021. http://dx.doi.org/10.2507/32nd.daaam.proceedings.066.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Axial-piston hydraulic machines"

1

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.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
2

Ernst, Meike H., and Monika Ivantysynova. "Cylinder Bore Micro-Surface Shaping for High Pressure Axial Piston Machine Operation Using Water as Hydraulic Fluid." In ASME/BATH 2017 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fpmc2017-4285.

Full text
Abstract:
Water as a working fluid in hydraulic systems: the benefits of this particular hydraulic fluid are both numerous and consequential, but its implementation remains nontrivial for certain key applications. One of these key applications is the axial piston machine of swashplate type, which counts among its selling points efficiency, the possibility of variable displacement, and the ability to function in high-pressure systems [1]. Water as a working fluid tends to mar that last point with its extremely low viscosity — and the high leakages and low load support that stand as effects of that fluid property in the context of tribological interfaces. However, water’s environmentally friendly, fire resistant nature is coupled with a high thermal conductivity and high heat capacity favorable for keeping hydraulic systems cool, as well as a high bulk modulus that cuts slack in the exact execution of machine motions [2]. That makes it worth implementing in hydraulic systems, even in the face of the aforementioned troubles. This paper investigates the effects of a surface shape that can be applied to the cylinder bores of axial piston machines with the goal of improving load support while keeping down leakage in the critical piston cylinder tribological interface of axial piston machines operating at high pressures with water as their hydraulic fluid.
APA, Harvard, Vancouver, ISO, and other styles
3

Mehta, Viral S., and Noah D. Manring. "The Theoretical Frequency Response of an Over-Center, Pressure-Controlled, Axial Piston Pump." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37391.

Full text
Abstract:
Axial piston pumps are ubiquitous in the hydraulic systems employed on various off-highway machines such as hydraulic excavators or wheel-loaders. These pumps exhibit a fairly slow response to the commanded input resulting in a slow response of the work tool (implement or transmission) as well, which is undesirable to machine operators and also slows down the machine’s productivity. Hence it is very important to understand the factors affecting the dynamic pump response. Much of the earlier work aims at understanding the steady state behavior of the pump control system using linear transfer function analysis. A closed-form solution for the dynamic frequency response has not been reported in previous research. This work presents the analysis of a variable displacement pump with an adjustable swash-plate for the purposes of identifying parameters that contribute to the response characteristics of the pump. The full model of the pump involves a seventh order model including a large number of non-linear terms. Hence a reduced order model has also been derived for calculating the frequency response of the pump in the closed form and it is shown that the design parameters that impact the frequency response most heavily are the actuator area, the swash-plate moment arm, and the flow gain of the four-way valve. As it turns out, an increased frequency response of the pump may be most readily achieved by increasing the charge pressure which in turn reduces the required actuator area and increases the flow gain of the valve.
APA, Harvard, Vancouver, ISO, and other styles
4

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.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
5

Ernst, Meike H., and Monika Ivantysynova. "Micro Surface Shaping for the High-Pressure Operation of Piston Machines With Water as a Working Fluid." In ASME/BATH 2015 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/fpmc2015-9534.

Full text
Abstract:
Oil is the main working fluid used in the hydraulics industry today — but water is nonflammable, environmentally friendly and cheap: it is the better choice of working fluid for hydraulic systems. However, there is one caveat. Water’s extremely low viscosity undermines its ability to carry load. In forest machinery, construction machinery, and aircraft systems, today’s hydraulic circuits have high operating pressures, with typical values between 300 and 420 bar. These high pressures create the need for high load-carrying abilities in the fluid films of the tribological interfaces of pumps and motors. The most challenging of these interfaces is the piston-cylinder interface of swashplate type piston machines, because the fluid must balance the entire piston side load created in this design. The low viscosity of the water turns preventing metal-to-metal contact into quite a challenge. Fortunately, an understanding of how pressure builds and shifts about in these piston-cylinder lubrication interfaces, coupled with some clever micro surface shaping, can allow engineers to drastically increase the load-carrying ability of water. As part of this research, numerous different micro surface shaping design ideas have been simulated using a highly advanced non-isothermal multi-physics model developed at the Maha Fluid Power Research Center. The model calculates leakage, power losses, film thickness and pressure buildup in the piston-cylinder interface over the course of one shaft revolution. The results allow for the comparison of different surface shapes, such as axial sine waves along the piston, or a barrel-shaped piston profile. This paper elucidates the effect of those surface profiles on pressure buildup, leakage, and torque loss in the piston-cylinder interface of an axial piston pump running at high pressure with water as the lubricant.
APA, Harvard, Vancouver, ISO, and other styles
6

Manring, Noah D., Viral S. Mehta, Jeff L. Kuehn, and Bryan E. Nelson. "Sensitivity Analysis for the Operating Efficiency of an Axial Piston Pump." In ASME/BATH 2015 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/fpmc2015-9524.

Full text
Abstract:
Axial piston pumps of swash-plate type are extensively used in off-highway machines to convert rotating mechanical power into hydraulic power. Efficiency of such pumps is of considerable importance to hydraulic design engineers. Many researchers have tried to create mathematical models for describing pump efficiency. These models are typically a system of nonlinear algebraic equations dependent upon a total of four variables (pressure, speed, temperature, displacement) and a set of experimentally determined coefficients. Since these models are not of the a-priori type, they are not of much value to a design engineer who is trying to design an efficient pump. Others have tried to use physics based models and numerical programs to accurately predict the influence of component design on efficiency. Such programs are considerably slow to run and of not much use to a design engineer who needs to make quick decisions. Hence the objective of this paper is to understand the sensitivity of various design parameters on the total efficiency of the pump by conducting a dimensionless parameter study of a large set of pump design parameters. Using this method it will be shown that a small group of design parameters have the highest influence on the efficiency of these pumps.
APA, Harvard, Vancouver, ISO, and other styles
7

Michael, Paul, and Jose Garcia-Bravo. "The Determination of Hydraulic Motor Displacement." In SICFP’21 The 17:th Scandinavian International Conference on Fluid Power. Linköping University Electronic Press, 2021. http://dx.doi.org/10.3384/ecp182p188.

Full text
Abstract:
Because the geometrical displacement of a pump or motor is very difficult to measure directly, the derived capacity of motors is used to assess the efficiency of positive displacement machines. The current internationally accepted method for deriving the displacement of hydraulic pumps and motors is ISO 8426:2008. Difficulties in accurately assessing derived displacement via ISO 8426:2008 have been reported by several authors. These inaccuracies can lead to efficiency results that exceed 100% in ISO 4409:2019 performance tests. In the presented work, fixed axial, variable axial, and radial piston motors were evaluated at 50°C and 80°C in dynamometer tests. Linear, orthogonal, and semi-randomized data sets were collected. The Wilson, Toet, and an analytical form of the Toet were compared with ISO 8426:2008. In general, the differences between the various methods for deriving displacement were not statistically significant, except in the instance of the axial piston motor. In the axial piston motor, the ISO 8426:2008 derived displacement was approximately 1% lower than the other methods. Use of this lower ISO 8426:2008 displacement in efficiency calculations produced values exceeding 100%. The error in the ISO 8426:2008 derived displacement determination was attributed to difficulties in detecting speeddependent factors that affect displacement when testing is conducted at a single speed. The ISO 8426:2008 method does not provide instructions for calculating derived displacement when data is collected at more than one speed. It is proposed that the One-Step Toet method be incorporated into ISO 8426 as a method for calculating the derived displacement when users opt to measure performance at multiple speeds. This revision will reduce the potential for speed-dependent errors in the determination of derived displacement.
APA, Harvard, Vancouver, ISO, and other styles
8

Kivelä, Tuomo, and Jouni Mattila. "Internal Leakage Fault Detection for Variable Displacement Axial Piston Pump." In ASME/BATH 2013 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fpmc2013-4445.

Full text
Abstract:
In mobile machines, reliable condition monitoring (CM) of hydraulic system would be very beneficial because it could decrease the maintenance costs in case of a failure. It should also foresee potentially harmful, slight defects in the system, before they lead to system downtime. Very often the focus of the CM is in short term performance. For example, a neural network-based CM solutions require an extensive data collection and teaching phase. A model-based CM on the other hand an accurate model of the process which is tuned into a known operation points. However, it is typical that the operation conditions change. As a result, the process models become outdated and cause-action definitions do not apply to the changed situation. Therefore, a new model structure, Multi-Variable Histogram (MVH), for CM purposes is introduced. The MVH model is statistical nonlinear model of variable relations. The model is based on schematics where the system operation point changes are taken into account. The system input variables, as explanatory variables, define the operation point for the variable being observed. When the effects of the system input variables excluding faults are taken into account, faults can be seen as operation point changes. MVH model based CM solution includes the key elements of a long-term manageable CM solution. Furthermore, the experimental tests are carried-out with a variable displacement axial piston pump to verify the performance of the solution.
APA, Harvard, Vancouver, ISO, and other styles
9

Deeken, Michael, and Hubertus Murrenhoff. "Simulation of Fluid Power Components Using DSHplus and ADAMS." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/fpst-25022.

Full text
Abstract:
Abstract Efficiency improvement of an axial piston pump or motor is an important part in the design and development process. The behaviour of an axial piston pump or other displacement machines is a complex interaction between tribology of sliding contacts, pressure gradient in hydraulic volumes and dynamics and kinematics. Simulation programs are useful development tools to design these fluid power components on digital computers. At present all these programs are stand-alone tools and specialised to calculate a specific behaviour or effect of an axial piston pump or motor. To reproduce and to solve all this physical effects numerically in one program is impractical. Since the opportunity exists to couple standardised products, this is a promising approach. The paper presents a simulation approach of a displacement machine (axial piston pump in swash plate design) using two different kinds of simulation programs. The tribology, e.g. surface roughness, mixed lubrication and contact pressure, and the hydraulic, e.g. the computed pressure gradient and flows, are calculated numerically by means of DSHplus. The integration of all kind of forces and torque, e.g. mass moment of inertia and pressure forces, to solve the equation of motion is calculated with a multiple body simulation program, in this case ADAMS by Mechanical Dynamics. The flexible modelling of mechanical structures in ADAMS makes it possible to create various simulation models of motion, such as cylinders and valves. The mechanical simulation program is coupled with the hydraulic simulation program DSHplus. Both programs run simultaneously on PCs and exchange data in discrete simulation time intervals.
APA, Harvard, Vancouver, ISO, and other styles
10

Nahin, Md Minal, Garrett R. Bohach, F. N. U. Nishanth, Eric L. Severson, and James D. Van de Ven. "Dynamic Modeling and Design of a Radial Hydrostatic Piston Pump for Integrated Pump-Motor." In ASME/BATH 2021 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/fpmc2021-68788.

Full text
Abstract:
Abstract There is a current trend towards the electrification of high force/torque density machines that have traditionally been dominated by diesel engine driven hydraulics. Power dense electric machines tend to favor high operating speeds whereas a hydraulic pump is more efficient at low speed and high torque conditions. The power density of a pump can be increased by decreasing the displacement and increasing the operating speed to provide the flow demand. This miniaturization of the pump allows it to be directly integrated into an electric motor inside a single casing. This integrated pump-motor is free of shaft seals and eliminates a set of bearings otherwise required when coupling an electric motor and pump with a shaft. Additionally, the leakage from the hydraulic pump can be used as coolant for the electrical machine, thereby improving the power density. In this paper, a hydrostatic radial piston pump has been evaluated for integration with an axial flux PM machine. The proposed hydrostatic piston pump uses a spherical head piston that can tilt while reciprocating inside the cylinder, eliminating the need for a joint at the slipper. To reduce the frictional loss between the slipper pad and the cam at high operating speeds, the cam freely rotates. A detailed model of the pump, with focus on the hydrostatic piston slipper, has been developed and a grid search approach has been utilized to select the critical parameters of the pump. Finally, an efficiency map has been presented for this pump at different operating conditions which shows around 86% efficiency at the 12500 rpm speed for 7 MPa pressure differentials.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Axial-piston hydraulic machines' for particular source types:
Journal articles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography