A New Very Fast Simulation Method For
Fluid Structure Interaction Of An Air Bearing
Crossing Steps In The Ground
Author(s)
M. Bäuml & J. Heinzl
Abstract
A new and very fast simulation method for the fluid-structure interaction of an
axial bearing is presented. Innovative applications require level surfaces with an
area of several hundred square meters where air bearings carry loads of more
than 5 tons. The sliding speed is assumed to be low. The ground consists of
several segments. When the bearing is crossing the gap between two assembled
plates, a step with a height of 10 to 20µm appears due to elastic deformation of
the segments. The resulting excitation leads to axial and tilt oscillation. This
dynamical interaction between the air cushion, the step in the ground and the
superposed oscillation of the rigid bearing is very complex but can be simulated
with the new method. The presented simulation method was entirely developed
in Visual Basic and allows visual control during computation. The simulation is
based on the finite volume technique. The new simulation method basically
shows the same characteristics as the measurement results. The simulation time
compared to other simulation tools is very low. It is in the regime of seconds to
calculate an air bearing with a diameter of 80mm crossing a step of 2µm in the
level surface. This time advantage is achieved with a simple model for the
dynamic motion of a rigid body combined with a finite volume simulation for the
flow in the gap and an analytical description of the nozzles. Further adaptation
will result in a simulation tool which allows design calculations for dynamically
stimulated aerostatic bearings.
Keywords: interaction of air with bearing support, finite volume simulation,
aerostatic axial bearing, compressible fluid, rigid body motion.
Keywords
interaction of air with bearing support, finite volume simulation,
aerostatic axial bearing, compressible fluid, rigid body motion.
Related Book
Other papers in this volume
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