A New Identification Method Of The Supply Hole
Discharge Coefficient Of Gas Bearings
Author(s)
G. Belforte, F. Colombo, T. Raparelli, A. Trivella & V. Viktorov
Abstract
The paper shows a new methodology to identify the orifice discharge coefficient
of pneumatic externally pressurized bearings. A common method of
identification is to measure the experimental air flow, the supply pressure and the
local maximum of the pressure distribution in the bearing clearance near the
supply hole. This method however involves some practical difficulties especially
with small supply hole diameters due to the high pressure and velocity gradients
near the supply holes. The proposed new method requires both theoretical and
experimental approaches. It differs from the previous method because the
experimental activity involves measuring only the pressure in correspondence of
one specified point under the pad far from supply holes. The pressure
distribution under the pad is calculated by solving the Reynolds equation. The
pressure boundary condition near the supply holes and consequently the pressure
distribution in the pad clearance depend on the supply hole discharge coefficient.
By using the bisection method the discharge coefficient value is changed
iteratively in order to find the convergence of the experimental pressure value
with the numerical one. The discharge coefficient is obtained when the
experimental pressure measured in the selected point corresponds with the
calculated one. This new method is simpler to realize experimentally and it is
less sensitive to the position of the measuring hole. Air pads with different
supply hole diameters are tested. The pressure distribution under the pads is
determined experimentally using a test bench at the purpose realized. The tests
are carried out with different air clearances and supply pressures.
Keywords: pneumostatic air pad, discharge flow coefficient, gas lubrication,
gas bearing.
Keywords
pneumostatic air pad, discharge flow coefficient, gas lubrication,
gas bearing
Related Book
Other papers in this volume
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