Hydraulic-Mechanical Coupled Simulation of 2D Micromotion in Variable Displacement Vane Pumps

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This study aims to present a simulation methodology that combines a lumped parameter hydraulic model with a multibody mechanical model. The core principle of the method involves calculating forces acting on the moving elements within the hydraulic model, while the multibody model determines the resulting displacements of the mechanical components. A key advantage of this approach is its ability to evaluate 2D micromovements caused by clearances between the vanes and other mechanical parts of the pump core. It enables the simulation of scenarios such as vanes detaching from the stator track, tilting within rotor slots, and interacting with each other through the floating rings beneath them. The simulations identified two distinct behaviors based on operating conditions. At low rotational speeds, there is significant interaction between the vanes and the rings, with the vanes exerting forces that keep the rings in nearly constant positions. At high speeds, however, all vanes maintain continuous contact with the stator track, and the rings behave as fully floating components. This model provides a more accurate calculation of the forces exchanged between mechanical parts, making it a valuable tool for optimizing pump design.