Computer Aided Optimization of Bearing and Sealing Gaps in Hydrostatic Machines—The Simulation Tool Caspar

Wieczorek, Uwe; Ivantysynova, Monika

doi:10.1080/14399776.2002.10781124

Cited by 130 publications

(74 citation statements)

References 2 publications

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“…These facts give grounds to assert that no-sliding or rolling type of piston motion is more suitable for breakaway and at low speeds. The pressure field values are mostly coincide with results of other researches [4] - [8] for the same kinematics of the mechanism, though the pressure field values for the kinematics that had not been described in these works were also found. These results are sufficient to find a speed value that will cause transition to liquid lubrication.…”

Section: Pressure Fieldsupporting

confidence: 79%

“…The second type of piston motion relative to the cylindrical bore is the partial rolling along the bore (or the bronze bushing) outer edge. This type of motion had not been described in mathematical models of authors [4] - [8]. Presented kinematic dependencies give data that is necessary to solve the Reynolds equations.…”

Section: Conclusion and Further Workmentioning

confidence: 99%

“…U. Wieczorek and M. Ivantysynova [4] demonstrated a model of a gap flow in the piston pair. Y. Fang and M. Shirakashi [5] described conditions of metal contact in the piston-bore interface and a way to express characteristics of mixed lubrication.…”

Section: Literature Reviewmentioning

confidence: 99%

See 2 more Smart Citations

Hydrodynamic Processes in Piston–Bore Interface of Axial Piston Swash Plate Machine

Kuzmin¹,

Popov²,

Stazhkov³

2017

DAAAM Proceedings

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Section: Pressure Fieldsupporting

confidence: 79%

Section: Conclusion and Further Workmentioning

confidence: 99%

See 1 more Smart Citation

Hydrodynamic Processes in Piston–Bore Interface of Axial Piston Swash Plate Machine

Kuzmin¹,

Popov²,

Stazhkov³

2017

DAAAM Proceedings

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“…Compressible fluid and a pump model with nine pistons were used, and the results were highly precise. Wieczorek and Ivantysynova (2014) created a piece of software called CASPAR by using CFD, which can analyze the pressure, temperature and friction of the oil film inside the pump. added the compressible sub-model using user-defined functions in the CFD model to predict the flow ripple, as well as building a test rig of flow ripple to study the validity of the simulation.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the flow dynamics characteristics of an axial piston pump based on the computational fluid dynamics method

Zhang

Hong

et al. 2016

Engineering Applications of Computational Fluid Mechanics

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Fang (2017) Analysis of the flow dynamics characteristics of an axial piston pump based on the computational fluid dynamics method, Engineering Applications of Computational Fluid Mechanics, 11:1, 86-95, DOI: 10.1080/19942060.2015 ABSTRACTTo improve its working performance, the flow ripple characteristics of an axial piston pump were investigated with software which uses computational fluid dynamics (CFD) technology. The simulation accuracy was significantly optimized through the use of the improved compressible fluid model. Flow conditions of the pump were tested using a pump flow ripple test rig, and the simulation results of the CFD model showed good agreement with the experimental data. Additionally, the composition of the flow ripple was analyzed using the improved CFD model, and the results showed that the compression ripple makes up 88% of the flow ripple. The flow dynamics of the piston pump is mainly caused by the pressure difference between the intake and discharge ports of the valve plates and the fluid oil compressibility. ARTICLE HISTORY

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“…They have been given the temperature distribution of and compared with the thermohydrodynamic lubrication (THL) analysis. Subsequently, Wieczorek and Ivantysynova [7] developed simulation software for the swash-plate type axial piston pump. However, the specification of the test pumps and the condition of the experiment differed from those of actual hydraulic pumps.…”

Section: Introductionmentioning

confidence: 99%

Temperature Measurement of Tribological Parts in Swash-Plate Type Axial Piston Pumps

Kazama¹,

Tsuruno²,

Sasaki³

2008

Proceedings of the JFPS International Symposium on Fluid Power

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Temperatures of a swash plate, cylinder block, and a valve plate of swash-plate type axial piston pumps with a rotating cylinder block and a rotating swash plate were measured. Thermocouples were embedded underneath these parts . Hydraulic mineral oils with ISO VG22, 32, 46, and 68 and a water-glycol type hydraulic fluid with VG32 were used as test fluids. The maximum discharge pressure was 20 MPa and the maximum rotational speed was 28.3 rps. The inlet oil temperatures were specified as 293-313 K. At the atmospheric pressure to the maximum discharge pressure , the temperatures, flow rates, and the torque were measured. Results support the following conclusions: i) as the discharge pressure increased, the temperatures of the swash plate, cylinder block, and the valve plate increased in almost direct relation; ii) the cylinder block temperature at the bottom dead center of the pistons increased markedly; iii) the temperature increases using the water-glycol fluid were noticeably smaller than the rises using the mineral oils; and iv) the temperature rises became large for higher fluid viscosity and lower inlet oil temperature.

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Computer Aided Optimization of Bearing and Sealing Gaps in Hydrostatic Machines—The Simulation Tool Caspar

Cited by 130 publications

References 2 publications

Hydrodynamic Processes in Piston–Bore Interface of Axial Piston Swash Plate Machine

Hydrodynamic Processes in Piston–Bore Interface of Axial Piston Swash Plate Machine

Analysis of the flow dynamics characteristics of an axial piston pump based on the computational fluid dynamics method

Temperature Measurement of Tribological Parts in Swash-Plate Type Axial Piston Pumps

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