"A Combined Hydrostatic Hydrodynamic Bearing Based on Elastic Deformation"
: Proceedings of ASME 2016 9th FPNI Ph.D Symposium on Fluid Power, 10-2016
A Combined Hydrostatic Hydrodynamic Bearing Based on Elastic Deformation
Sprache des Titels:
Proceedings of ASME 2016 9th FPNI Ph.D Symposium on Fluid Power
Servo cylinders with hydrostatic bearings are employed
when ultimate speed, low friction, or high precision are required.
These advantages are opposed by a considerable
leakage loss and high costs. The latter are caused by the
high component precision required in order to avoid excessive
leakage and to obtain high stiffness of the bearing.
In this paper an alternative concept to realize such bearings
with a considerable cost reduction potential is investigated.
The sleeve is made of Polyetheretherketon (PEEK).
A hydrostatic difference pressure or / and a hydrodynamic
pressure deforms the PEEK sleeve such that a conical stabilizing
sealing gap is created. A possible mechanical design
is shown and the characteristics are analysed.
To study the characteristics of the bearing system the finite
element suite Abaqus is used. A Reynolds User Element
is developed and included into Abaqus for the simulation of
the fluid structure interaction. The Reynolds equation is
discretised by finite elements and solved simultaneously with
the mechanical model. With the developed user element in
Abaqus, static and quasi-static analyses of mechanical models
(linear, non-linear or inelastic material behaviour) containing
lubrications gaps can be performed efficiently.
The preliminary results showed the feasibility of the concept
and, generally, the potentials of plastics as a flexible
material to employ elastic deformation for the creation of