Influence of Piston Number on Churning Losses in Axial Piston Pumps

Li, Ying; Chen, Xing; Luo, Hao; Zhang, Junhui; Zhang, Jin

doi:10.1186/s10033-022-00757-6

Cited by 4 publications

(2 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A computational fluid dynamics model of an axial piston pump was developed to analyse churning losses. 19 A test stand was built on a computer numerical control (CNC) machine to study the dynamic effect of the annular flow on a rotor. 20 The results showed that the annular flow gap significantly affected the vibration characteristics and stability of the rotor system.…”

Section: Introductionmentioning

confidence: 99%

Vibration and stability analyses of rotor–bearing-casing system in an axial piston pump subjected to bearing faults

Wu,

Tang,

Ying

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part K:

View full text Add to dashboard Cite

Healthy roller bearings are essential for the safe performance of axial piston pumps. A dynamic failure model of a rotor–bearing-casing system was developed to investigate the effect of bearing damage on the vibration characteristics and stability. This model considers the effect of large-gap circulation on a wet rotor system model, which is closely related to the stirring conditions during actual operation of axial piston pumps. The stator and rotor of the pump were modelled using the centralised parameter technique and finite element method, which were combined to develop the rotor–bearing-casing model. Vibration and stability analyses were performed for the system model with bearing failure, considering the gap annular flow and hydraulic excitation force. The effects of the mass eccentricity, rotational speed, and discharge pressure on the vibration characteristics and stability were analysed under different types of bearing failures. Furthermore, the vibration behaviour of the rotor–bearing-casing system with a bearing fault was measured to validate the established dynamic model. The results indicated that the rotational speed and rotor eccentricity affected the churning and unbalanced effects of the rotor. With an increase in the rotor eccentricity, the rotor first transitioned from nonlinear motion to one-period motion and subsequently to periodic motion. The rotor energy reduction and steady state of the rotor–bearing-casing system were induced by the rotor churning action. As the annular gap decreased, churning losses increased, resulting in a more stable rotor motion.

show abstract

Section: Introductionmentioning

confidence: 99%

Vibration and stability analyses of rotor–bearing-casing system in an axial piston pump subjected to bearing faults

Wu,

Tang,

Ying

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part K:

View full text Add to dashboard Cite

show abstract

“…When the number of pistons and the displacement of the pistons are the same, reducing the pitch radius of the piston hole is the best method to reduce the churning loss. 13 Wei et al used the moving particle semi-implicit (MPS) method to calculate the churning loss of the hydraulic pump, and the results showed that the total churning loss decreased with the decrease of the tilt angle of the swash plate. When the oil content is 70%, the churning loss of the pump is reduced by 57.4%.…”

Section: Introductionmentioning

confidence: 99%

Analytical modeling and experimental verification of churning torque for cam guide rails of 2D piston pump

Zhang,

Chen,

Zhu

et al. 2023

Advances in Mechanical Engineering

View full text Add to dashboard Cite

For 2D piston pump the churning torque of its cam guide rails at high speed is one of the main sources of mechanical efficiency loss. To conveniently calculate the churning torque and also provide guidance for future optimization of churning torque reduction, an accurate analytical model of constant acceleration and constant deceleration cam guide rail assembly of the stacked-rollers 2D piston pump is established, where the whole churning torque is divided into the peripheral churning torque, the pushing flow churning torque, and the end face churning torque. Then the analytical model is verified by CFD simulation preliminarily. Analytical modeling shows that at 16,000 rpm, the churning torque reaches about 0.826 N m, where the peripheral churning torque, the pushing flow churning torque, and the end face churning torque account for about 55.4%, 37.3%, and 7.3% of the total torque respectively, indicating that the structural parameters related to the pushing flow torque should be optimized with first priority at high rotational speed. Finally, the churning torque at 1000–16,000 rpm was experimentally measured and the influence of oil temperature was considered. The experimental results are in good agreement with the results of analytical modeling and CFD simulation, thus verifying the correctness of the proposed analytical model.

show abstract

Volumetric efficiency degradation prediction of axial piston pump based on friction and wear test

Yin,

Zhang,

Wang

et al. 2024

Heliyon

View full text Add to dashboard Cite

Influence of Piston Number on Churning Losses in Axial Piston Pumps

Cited by 4 publications

References 24 publications

Vibration and stability analyses of rotor–bearing-casing system in an axial piston pump subjected to bearing faults

Vibration and stability analyses of rotor–bearing-casing system in an axial piston pump subjected to bearing faults

Analytical modeling and experimental verification of churning torque for cam guide rails of 2D piston pump

Volumetric efficiency degradation prediction of axial piston pump based on friction and wear test

Contact Info

Product

Resources

About