0D models of axial piston pumps/motors (UNDERWAY)

Starting from 1999, different types of axial piston machines have been studied by means of lumped parameter models built in the AMESim environment (currently Simcenter Amesim). A customized library of components has been developed for properly simulating the specific geometry of the machine. The model is fully parametric and all geometric quantities, derived from the inputs, are automatically evaluated by the simulation code. At the start of simulation, parameters are first checked for geometry consistency. A particular care has been exercised in the calculation of the flow passage areas: in this respect, dimensions and number of kidney shaped slots, relief grooves and defining angles can all be varied at will. Besides hydraulic quantities, the simulation model also evaluates exchanged forces within the pump. In more detail, the entire pump unit is broken down into its constituent components (swash plate, slippers, pistons, barrel and so on) and on each of them rotational and translational equilibrium conditions are expressed along the three axes of a Cartesian reference frame.

In figure 1 the model of the pump with 3 displacement controls (absolute and differential pressure limiter and torque limiter) is reported.

Figure 1

In figure 2 the user-friendly interface for setting the geometric parameters of swashplate axial piston pumps is shown. A similar interface is also available for the parameters of the port plate.

Figure 2

A pump mounted on the old test rig for the experimental validation of the simulation model is visible in figure 3, while in figure 4 the delivery pressure ripple at two different angular speeds is reported.

Figure 3

Figure 4

More analyses and details are available in:

CORVAGLIA A, RUNDO M, 2018: Comparison of 0D and 3D Hydraulic Models for Axial Piston pumps

MANCO' S, NERVEGNA N, LETTINI A, COLELLA L, 2003: Simulation of a split delivery pump

LETTINI A, COLELLA L et al. 2003: Studio e simulazione numerica del limitatore di coppia ...

MANCO' S, NERVEGNA N, LETTINI A, GILARDINO L, 2002: Advances in the simulation of axial piston pumps

GILARDINO L, MANCO' S, NERVEGNA N, VIOTTO F, 1999: An experience in simulation: the case of a ...

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