What question did this study set out to answer?

To investigate the transient lubrication behavior, thermal evolution, and structural responses of the piston–cylinder interface in axial piston pumps under variable operating pressures and non-concentric piston postures.

August 20, 2026LubricantsOpen Access

Transient Evolution of the Piston–Cylinder Oil Film and Thermo–Fluid–Solid Coupling Response in an Axial Piston Pump Under Complex Operating Conditions

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Authors

SLSibo LiuGuilin University of Aerospace Technology HZHongwang ZhaoGuilin University of Aerospace Technology JLJiabao LiYunnan Normal University

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Overview

Computational simulation demonstrates non-concentric posture impacts on oil-film dynamics and mechanical stress in axial piston pumps, highlighting wear risks during high-pressure operation.

Key Points

To investigate the transient lubrication behavior, thermal evolution, and structural responses of the piston–cylinder interface in axial piston pumps under variable operating pressures and non-concentric piston postures.
Established an integrated thermo–fluid–solid coupling framework linking an AMESim full-pump model, a Fluent transient oil-film model, and a Transient Structural model.
Applied dynamic meshing, user-defined function (UDF) periodic pressure transfer, and a calibrated Roelands viscosity-pressure-temperature law to simulate parallel-offset and center-tilted piston postures.
Increasing load pressure from 10 to 30 MPa raised maximum discharge-stage temperature from 28.39 to 36.95 °C and average leakage from 0.0201 to 0.1026 L/min, while increasing speed from 1000 to 3000 r/min reduced cycle-averaged leakage by 8.93%.
At 500 r/min and 30 MPa, the parallel-offset posture reached a maximum temperature of 46.34 °C, shear stress of 41 kPa, and leakage of 0.0990 L/min.
Under the same conditions, the center-tilted posture produced a peak resultant force of 3537.12 N, an inner-wall stress band of 76.96 MPa, and maximum piston deformation and equivalent stress of 4.31 μm and 83.16 MPa.

Cite This Study

Liu et al. (2026) studied this question.

synapsesocial.com/papers/6a86b5ff8a91293e6a1cd99e https://doi.org/10.3390/lubricants14080319

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August 20, 2026LubricantsOpen Access

Transient Evolution of the Piston–Cylinder Oil Film and Thermo–Fluid–Solid Coupling Response in an Axial Piston Pump Under Complex Operating Conditions

View Full Paper

Ask AI

Bookmark

Authors

SLSibo LiuGuilin University of Aerospace Technology HZHongwang ZhaoGuilin University of Aerospace Technology JLJiabao LiYunnan Normal University

Discussion

Member takes

Overview

Computational simulation demonstrates non-concentric posture impacts on oil-film dynamics and mechanical stress in axial piston pumps, highlighting wear risks during high-pressure operation.

Key Points

To investigate the transient lubrication behavior, thermal evolution, and structural responses of the piston–cylinder interface in axial piston pumps under variable operating pressures and non-concentric piston postures.
Established an integrated thermo–fluid–solid coupling framework linking an AMESim full-pump model, a Fluent transient oil-film model, and a Transient Structural model.
Applied dynamic meshing, user-defined function (UDF) periodic pressure transfer, and a calibrated Roelands viscosity-pressure-temperature law to simulate parallel-offset and center-tilted piston postures.
Increasing load pressure from 10 to 30 MPa raised maximum discharge-stage temperature from 28.39 to 36.95 °C and average leakage from 0.0201 to 0.1026 L/min, while increasing speed from 1000 to 3000 r/min reduced cycle-averaged leakage by 8.93%.
At 500 r/min and 30 MPa, the parallel-offset posture reached a maximum temperature of 46.34 °C, shear stress of 41 kPa, and leakage of 0.0990 L/min.
Under the same conditions, the center-tilted posture produced a peak resultant force of 3537.12 N, an inner-wall stress band of 76.96 MPa, and maximum piston deformation and equivalent stress of 4.31 μm and 83.16 MPa.

Cite This Study

Liu et al. (2026) studied this question.

synapsesocial.com/papers/6a86b5ff8a91293e6a1cd99e https://doi.org/10.3390/lubricants14080319

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