Development of an analytical model to estimate the churning losses in high-speed axial piston pumps

Chao, Qun; Tao, Jianfeng; Liu, Chengliang; Li, Zhengliang

doi:10.1007/s11465-021-0671-1

Cited by 4 publications

(4 citation statements)

References 23 publications

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“…Tremendous research efforts have been dedicated to numerical leakage models for axial piston pumps in recent years, but little new research has been done on analytical models since the work by Bergada et al 16 The trend in axial piston pumps is moving toward high-speed rotation for great power density, 26,27 but most of previous studies still modeled the tribological interface leakage as a pure pressure-induced flow or a simple mixture of pressure- and velocity-induced flows. It remains unclear how the rotational speed affects the interface leakage due to the absence of accurate analytical leakage models for tribological interfaces.…”

Section: Introductionmentioning

confidence: 99%

New analytical leakage models for tribological interfaces in axial piston pumps

Chao

Shao

Liu

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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Axial piston pumps act as the power source in hydraulic systems and their volumetric losses mainly arise from leakage of tribological interfaces. The leakage of tribological interfaces was often modeled as a simple mixture of pressure-induced flow and velocity-induced flow in previous studies. However, few studies have clarified the contribution of discharge pressure and rotational speed to the leakage flow. This work considers both pressure and velocity factors and establishes new analytical models for the leakage of tribological interfaces from Navier-Stokes equations. Experiments were performed on an actual axial piston pump to measure its leakage flow rates at different discharge pressures and rotational speeds. Results show that the total pump leakage excludes Couette flow and only includes Poiseuille and centrifugal flows. The Poiseuille flow predominates the pump leakage while the centrifugal flow contributes little to the pump leakage.

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Section: Introductionmentioning

confidence: 99%

New analytical leakage models for tribological interfaces in axial piston pumps

Chao

Shao

Liu

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

“…In addition, both high pressure and low temperature can cause changes in the physical properties of the oil, especially in viscosity, density and elastic modulus. The change in oil viscosity can directly affect the oil churning loss of the pump clearance and sliding bearings, the air gap and the rolling bearings of the motor [13,14]. Tian et al [15] investigated the efficiency characteristics of deep-sea hydraulic power sources in the full range of sea depth, and calculated the oil friction loss of the motor, the internal leakage of the gear pump and the viscous friction loss of the hydraulic system according to the power transmission process.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Efficiency Characteristics of a Deep-Sea Hydraulic Power Source

Li,

Guo,

et al. 2023

Lubricants

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Deep-sea submersibles carry limited energy sources, so a high efficiency of the equipment is required to improve endurance. In the deep-sea environment, the hydraulic power source is filled with oil, which causes structural deformation of the power source and changes in the physical properties of the medium, leading to unknown changes in the efficiency characteristics of the power source. In order to explore the efficiency characteristics of the deep-sea hydraulic power source composed of a gear pump and a DC (direct current) brushless motor in a variable sea depth environment, we undertook the following. First, considering the effects of seawater pressure and temperature on the physical properties of the medium and the radial clearance deformation of the gear pump, a mathematical model for the total efficiency of the hydraulic power source was established. The results indicate that the deformation of the pump body is mainly determined by the seawater pressure and working pressure. Subsequently, by analyzing the effects of the two factors on the efficiency of the power source, respectively, when the oil temperature range is large enough, the total efficiency of the power source will increase and then decrease under six sea depths; the total efficiency of the power source decreases with the increase in the rotational speed. However, in a land environment, the trend of the efficiency characteristics of the power source is opposite to that of the remaining six deep-sea environments, both in terms of oil temperature and rotational speed. Finally, the efficiency trend of the power source with changes in sea depth under rated conditions was obtained. Under different sea depth ranges, the optimal operating oil temperatures and suitable rotational speed ranges of the power source could be obtained. This paper could provide a certain theoretical basis for the research and development of deep-sea equipment.

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“…Parker company added a power booster unit to the hydraulic motor, 15 Danfoss company invented a dry bending shaft motor. 16 And Chao et al 17 established a mathematical model to analyze the churning loss of the axial piston pump, it provides a basis for accurately calculating the churning loss of the high-speed axial piston pump. Ding et al 18,19 studied the churning loss of a force-balanced 2D pump at high speed through CFD simulations and experiments.…”

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

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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.

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Development of an analytical model to estimate the churning losses in high-speed axial piston pumps

Cited by 4 publications

References 23 publications

New analytical leakage models for tribological interfaces in axial piston pumps

New analytical leakage models for tribological interfaces in axial piston pumps

Analysis of Efficiency Characteristics of a Deep-Sea Hydraulic Power Source

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

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