An Investigation of the Slipper/Swashplate Interface of Swashplate-Type Axial Piston Machines
Abstract
This thesis investigates the slipper/swash plate interface in swash plate–type axial piston machines. Slipper/swash plate interface behavior is complex and represents a unique modeling challenge. The fluid film in the interface must support high oscillating forces. The modeling approach is based upon a previously existing simulation model. Steady-state fluid pressure and temperature distributions are calculated using a parallel solution scheme. Structural deformation is a result of fluid pressure and solid body thermal expansion. Deformation is calculated off-line, then scaled and superimposed during simulation using an influence matrix method. The existing model was modified to include frictional effects which occur in the piston/slipper ball joint. Measurement validation is shown by comparison with leakage results from steady-state operation. Separately, film thickness sensor data is compared to simulation. Agreement with experimental data is improved at the majority of operating conditions and sensor locations, primarily as a result of improved assumptions about the material removal process from the slipper surface. Lastly, this work aims to identify surface geometries which correlate with minimal contact and energy loss. An evolutionary approach is proposed to characterize optimal surface micro-geometries by iterating the coefficients of truncated two-dimensional Fourier series.
Degree
M.S.M.E.
Advisors
Ivantysynova, Purdue University.
Subject Area
Mechanical engineering
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