Abstract This paper presents a machine learning neural network capable of approximating pressure as the distributive result elastohydrodynamic (EHD) effects for journal bearing at steady state. Design efficient, reliable fluid power pumps and motors requires accurate models lubricating interfaces; however, many state-of-the-art simulation are structured around numerical solutions to Reynolds equation which involve nested iterative loops, leading long durations limiting ability use such in...

Researchers at Purdue’s Maha Fluid Power Research Center have developed models that will enable computational design of piston machines. The core the in-house program forms multi-domain capturing fluid–structure interaction phenomena taking place in main lubricating interfaces (piston/cylinder, cylinder block/valve plate, and slipper/swash plate) axial model allows studying influence a given pump or motor on machine performance, power loss, energy dissipation those interfaces. behavior fluid...

The understanding of the power loss contributions each source is essential for an effective development swash plate type axial piston pump. However, it difficult to obtain assessment distribution due lack methodologies that allow independent evaluation source. This paper addresses this challenge using most recent simulation methods. It describes determination source, along with corresponding performance, and principle their prediction during design phase. also reports validation model by...

Abstract The cylinder block/valve plate interface is one of the major power loss sources and main failure points in axial piston pumps motors. Surface micro-texture has been proven to be an effective approach reduce friction wear many tribological applications. In present paper, effect on lubricating performance important studied experimentally numerically. experimental investigation was conducted a disk-on-disk tribometer with similar geometry, operating speed, material, working fluid pump....

The authors propose a temperature adaptive piston design for axial machines of swash plate type. proposed helps to keep the film thickness between and cylinder close optimal with respect energy dissipation while operating can change in wide range. utilize thermal deformation cylinder, which varies temperature, interface that adapt gap height compensate fluid viscosity temperature. An in-house developed fluid-structure interaction model together recently port case prediction are used analyze...

In lieu of reliable scaling rules, hydraulic pump and motor manufacturers pay a high monetary temporal price for attempting to expand their production lines by existing units other sizes. The challenge is that the lubricating interfaces, which are key elements in determining performance positive displacement machine, not easily scalable. This article includes an analysis size-dependence these with regard significant physical phenomena describing behavior three most critical interfaces. These...

The slipper/swashplate interface, as one of the three main lubricating interfaces in swashplate type axial piston machine, serves both a sealing function and bearing while dissipating energy into heat due to viscous friction. prevents fluid displacement chamber from leaking out through gap case, slipper contacting swashplate. challenge conventional interface design is rely on tribological pairing self-adaptive wearing process find surface profile that fulfills function. However, resulted...

The efficiency of an axial piston pump or motor is dominated by the volumetric and torque losses three main lubricating interfaces (piston/cylinder, cylinder block/valve plate, slipper/swash plate). research study in this paper only focuses on plate interface. goal to investigate a novel approach for scaling interface have same percentage baseline To achieve goal, many design parameters influencing performance are investigated. An in-house developed fluid structure thermal interaction model...

Abstract The efficiency and reliability of hydrostatic pumps motors are significantly affected by their tribological interfaces, which function as both a seal bearing. performance interfaces is heavily influenced design parameters, including clearance, roughness, material, surface finishing, thermal treatment, well the operating conditions, such speed, load, temperature, fluid characteristics. Experimental tests isolated lubricating for various designs conditions can greatly assist pump...

Manufacturing errors are inevitable in hydraulic machines. The manufactured geometry of solid parts directly governs the performance these This paper reports an extensive simulation study for inaccuracies on piston/cylinder interface axial piston machine using state-of-the-art tool. swashplate type machines is characterized mainly by three lubricating interfaces including cylinder block/valve plate, slipper/swashplate and interface. Among interfaces, more sensitive to manufacturing such as...

The fluid film behavior in the lubricating gap between piston and cylinder bore axial machines is main focus of this paper. thermal compressible viscous flow thin formed plays a critical role on interface performance energy dissipation, therefore, deserves thorough analysis. temperature distribution domain, as well heat flux from domain to solid follow first, second laws thermodynamics, however, are difficult solve due constantly changing boundary conditions. proposed thermodynamic model...

The temperature distribution of the lubricating interfaces is an important aspect functioning positive displacement machines.It can determine efficiency and life time unit.In particular, it directly affects fluid properties thermal induced deformations solid bodies.A simulation tool capable predicting in such gaps thus becomes very useful design process these machines.The a film comprises many physical phenomena including convection conduction along across film.Past numerical approaches...

This paper proposes a design methodology for power-dense and high-efficient electrohydraulic units (EHUs) that can be used to select specifications the electric machine (EM) given hydraulic (HM) architecture. The proposed method evaluates EHU performance considering both power losses. compactness of is achieved by integrating an axial piston unit as HM inside permanent magnet EM. provides sensitivity analysis important discusses best choices reducing total mass energy loss. study finds...

Axial piston machines find their use over a wide range of the power spectrum owing to superior reliability, efficiency, and density.They are also key component in applications like reverse osmosis firefighting wherein working fluid is water.Utilizing low viscous fluid, such as water, poses challenges designing critical lubricating interfaces pumps.Specifically, viscosity makes it difficult for provide sufficient bearing sealing functions challenging operating conditions.In order maintain...

Electric Machines (EMs) have gained increasing importance in the mobile hydraulic industry as prime movers for actuation systems. Therefore, their design and sizing are important aspects any system layout architecture. The on-road vehicle has exploited EM versatility by proposing different sizes various applications. However, off-road vehicles cannot borrow designs from applications directly due to unique challenges pertaining drive cycle dynamics limited space availability. Furthermore,...

Abstract This paper presents a machine learning neural network capable of approximating pressure as the distributive result elastohydrodynamic effects and discusses results for journal bearing at steady state. Design efficient, reliable fluid power pumps motors requires accurate models lubricating interfaces; however, most existing simulation are structured around numerical solutions to Reynolds equation which involve nested iterative loops, leading long durations limiting ability use such...