The paper presents an extensive analysis of the influence on suction capacity main geometric parameters gerotor lubricating pumps. study was carried out using a computational fluid dynamics (CFD) model developed with commercial software PumpLinx®. reference unit validated experimentally in terms delivered flow rate different operating conditions, open and closed circuit configuration. In former case, geometries inlet pipe were tested. latter, pressure at constant speed analyzed. After...

In recent years, the interest of industry towards condition-based maintenance, substituting traditional time-based is growing. Indeed, maintenance can increase system uptime with a consequent economic advantage. this paper, solution to detect health state variable displacement axial-piston pump based on vibration signals proposed. The was tested test bench in different operating points, both healthy and faulty conditions, latter obtained by assembling damaged components pump. were acquired...

Abstract Productivity, reliability, controllability, flexibility, and affordable costs represent key aspects in mobile machines. Additionally, due to the high fuel price introduction of stringent emission regulations for diesel engines, reduction consumption while persevering existing performance is current demand. In order satisfy maximize above requirements, different hydraulic system architectures have been developed during last decades. Both academia industry investing considerable...

With the rising demand for energy efficiency, displacement-controlled or so-called pump-controlled systems have become an attractive research topic applications in construction machinery and other off-road vehicles. Pump-controlled can be implemented with electro-hydrostatic actuators as electro-hydraulic zones, which are located next to end actuator a replacement traditional valve-controlled hydraulic actuation systems. In this paper 9-tonne class excavator is utilized study case. A...

The paper presents the computational fluid dynamics simulation of an external gear pump for power applications. aim study is to test capability model evaluate pressure in a tooth space entire shaft revolution and minimum inlet complete filling. takes into account internal leakages two different configurations thrust plates have been considered. simulations operating conditions validated with proper high transducers measuring revolution. Steady-state also performed order detect fall flow rate...

The paper presents geometric and kinematic aspects that constitute a premise to the modelling simulation of gerotor lubricating oil pumps. With reference commercial pump two different approaches pumping elements are addressed: classical integralderivative approach new derivative-integral approach. latter, based on volumes swept by vector rays, is easier implement requires less computer time at equal accuracy. Two also detailed feature reticulations consequently involve number ordinary...

A three-dimensional model of an external gear pump and a new application algorithm for the measurement unsteady flow rate in hydraulic pipes are presented. The experimental delivery ripple was compared with outcomes simulation under different operating conditions. comprehensive computational fluid dynamics high-pressure circuit developed SimericsMP+®. considers clearances, which vary according to shaft angle, between tip tooth inner surface stator, as well flanks teeth that contact. is...

This paper documents an extensive study aimed at a better understanding of the peculiarities and performance crankshaft mounted gerotor pumps for IC engines lubrication. At different extents, modelling, simulation testing specific unit are all considered. More emphasis, modelling phase, is dedicated to physical mathematical description flow losses mechanisms; often intricate aspects kinematics being deliberately left aside. The pressure relief valve analysed considerable extent as working...

In positive displacement pumps, the main volumetric loss at high speed is due to incomplete filling of variable volume chambers. The prediction limit and maximum flow rate delivered by a pump can be obtained only through Computational Fluid Dynamics (CFD) simulations, since shape, orientation, movement chambers with respect inlet must considered, along non-uniform distribution gaseous phase, dissolved air release. this paper, influence different geometric parameters on vane has been...

Pressure ripple has always been a major drawback in hydraulic circuits, since it is the main source of overall noise emitted by pump. This article presents theoretical analysis on active control pressure an axial piston pump properly moving swash plate. The reduction oscillations studied way and for this purpose mathematical model whole developed, focusing both fluid dynamic aspects component dynamics. An experimental activity performed order to validate model. results simulation, compared...

The paper presents geometric, kinematic and fluid-dynamic modelling of variable displacement vane pumps for low pressure applications in internal combustion engines lubrication. All these fundamental aspects are integrated a simulation environment form the core design tool leading to assessment performance, critical issues, related influences possible solutions well grounded engineering support decision.

Numerical and experimental investigations have been carried out in order to study the effect of poppet geometry on flow-pressure characteristic a direct acting pressure relief valve, which is equipped with flow deflector for force compensation. A dynamic 3D-CFD model was built ANSYS Fluent™, capable simulating interaction between fluid dynamics by means mesh deformation user-defined function (UDF). This applied predict characteristics valve different spring preload settings geometries. The...

This paper presents the lumped parameters model of an internal gear crescent pump with relief valve, able to estimate steady-state flow-pressure characteristic and pressure ripple. The approach is based on identification three variable control volumes regardless number teeth. has been implemented in commercial environment LMS Amesim development customized components. Specific attention paid leakage passageways, some them affected by deformation cover plate under action delivery pressure....

Centrifugal pumps (CPs) are widely utilized in many different industries, and their operations maintained by reliable performance. CPs’ most common faults can be categorized as mechanical or flow-related faults: the first ones often associated with damage at impeller, while second cavitation. It is possible to use computational algorithms monitor both failures CPs. In this study, two problems pumps, defective impeller cavitation, have been considered. When a CP working faulty condition, it...

The paper describes a multi-domain simulation of gerotor oil pump. Three different analysis tools have been used in synergy to predict the pump flow rate, both conditions complete and incomplete filling, pressure ripple. computational fluid dynamics software PumpLinx® has for determination discharge coefficients, while finite element model performed with ANSYS® allowed evaluation deflection cover under action delivery pressure. data calculated 3D utilized as input lumped parameter developed...

The paper presents an extensive analysis of the influence on suction capacity main geometric parameters gerotor lubricating pumps. study was carried out using a CFD model developed with commercial software PumpLinx®. reference unit validated experimentally in terms delivered flow rate different operating conditions, open and closed circuit configuration. In former case geometries inlet pipe were tested. latter pressure at constant speed analysed. After validation, several features changed to...

With the increasingly stringent regulations on air quality and consequent emission limits for internal combustion engines, researchers are concentrating studying new solutions improving efficiency energy saving even in off-road mobile machines. To achieve this task, pump-controlled or displacement-controlled systems have inspired interest applications working Generally, these derived from union of a hydraulic machine coupled to an electric one create compact components that could be...

Positive displacement pumps produce pressure ripple that can be reduced with the attenuation of generated flow ripple. This paper presents application a gas bladder hydraulic damper aim reducing oscillations delivery rate positive machines. work is focused on development 1D fluid dynamic model damper, which based fundamental motion equations applied for mono-dimensional flow. In order to represent inside particular evaluation sound speed has been implemented. Experimental tests have...

The paper describes the modeling and experimental tests of a variable displacement vane pump for engine lubrication. approach used simulation has involved three-dimensional (3D) commercial tools tuning zero-dimensional (0D) customized model implemented in LMS Amesim® environment. Different leakage paths are considered axial clearances to take into account deformation cover, calculated through finite element analysis with ANSYS. tip as function dynamic equilibrium equation vanes. control...