scholarly journals Thermodynamic Analysis on Compressible Viscous Flow and Numerical Modeling Study on Piston/Cylinder Interface in Axial Piston Machine

2019 ◽  
Vol 11 (3) ◽  
pp. 117-123
Author(s):  
Lizhi SHANG ◽  
Monika IVANTYSYNOVA
Keyword(s):  
Numerical Modeling ◽  
Viscous Flow ◽  
Thermodynamic Analysis ◽  
Piston Cylinder ◽  
Axial Piston Machine ◽  
Axial Piston ◽  
Modeling Study

Cylinder Bore Micro-Surface Shaping for High Pressure Axial Piston Machine Operation Using Water as Hydraulic Fluid

2017 ◽  
Author(s):  
Meike H. Ernst ◽  
Monika Ivantysynova
Keyword(s):  
High Pressure ◽  
High Pressures ◽  
High Heat ◽  
Surface Shape ◽  
Working Fluid ◽  
Hydraulic Fluid ◽  
Hydraulic Systems ◽  
Piston Cylinder ◽  
Axial Piston Machine ◽  
Axial Piston

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.

A Novel Positive Displacement Axial Piston Machine With Bent Cylinder Sleeves

2021 ◽  
Author(s):  
Swarnava Mukherjee ◽  
Antonio Masia ◽  
Mark Bronson ◽  
Lizhi Shang ◽  
Andrea Vacca
Keyword(s):  
Elastohydrodynamic Lubrication ◽  
Lumped Parameter Model ◽  
Cylinder Block ◽  
Element Analysis ◽  
Frictional Loss ◽  
Positive Displacement ◽  
Piston Cylinder ◽  
Lumped Parameter ◽  
Axial Piston Machine ◽  
Axial Piston

Abstract In this paper, an investigation of a novel positive displacement axial piston machine using a bent cylinder sleeve configuration is presented. The proposed design eliminates the side moments on the piston/cylinder interface, therefore, reduces the frictional loss and improves the total energy efficiency. A multi-physics elastohydrodynamic lubrication model was used to aid the design of the piston/cylinder and the cylinder block/port block interface. Then, a lumped parameter model was used to optimize the port block geometry. Groove geometry was chosen primarily to reduce flow ripple, tilting moment, and cavitation risk. To improve the housing stiffness, the lumped parameter model was combined with a finite element analysis. This ensured safety for the testing. In the end, steady-state experiments were performed on the prototype based on the ISO4409 normative. The unit’s speed was set to 500 rpm, then increased by 500 rpm until it reached 3000 rpm. The supply pressure was set to 20 bar. The outlet pressure was set to 70 bar at first, then increased by 50 bar until it reached 220 bar. The results show a remarkable volumetric efficiency with a peak of 99.5%. It is however noted that due to some of the issues with the initial iteration of the current design, there is a reduction in mechanical efficiency. The causes and possible future solutions to these issues are discussed in the manuscript.

EuroSTRATAFORM Numerical Modeling Study of Shelf Stratigraphy and Sedimentation

2004 ◽  
Author(s):  
Alan W. Niedoroda ◽  
Christopher W. Reed ◽  
Himangshu Das ◽  
Joseph Donoghue ◽  
Sergio Fagherazzi ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Modeling Study

Impact of Estuarine Dams on the Estuarine Parameter Space and Sediment Flux Decomposition: Idealized Numerical Modeling Study

2021 ◽  
Author(s):  
Steven M Figueroa ◽  
Guan-hong Lee ◽  
Jongwi Chang ◽  
Kenneth D Lagamayo ◽  
Nathalie W Jung
Keyword(s):  
Numerical Modeling ◽  
Parameter Space ◽  
Sediment Flux ◽  
Modeling Study

Advanced Virtual Prototyping of Axial Piston Machines

2016 ◽  
Author(s):  
Rene Chacon ◽  
Monika Ivantysynova
Keyword(s):  
Numerical Models ◽  
Virtual Prototyping ◽  
Valve Plate ◽  
Cylinder Block ◽  
Plate Interface ◽  
Design And Optimization ◽  
Swash Plate ◽  
Axial Piston Machine ◽  
Axial Piston ◽  
Plate Type

This paper explains how a combination of advanced multidomain numerical models can be employed to design an axial piston machine of swash plate type within a virtual prototyping environment. Examples for the design and optimization of the cylinder block/valve plate interface are presented.

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