...
One
...
option
...
which
...
may
...
be
...
suitable
...
for
...
the
...
modeling
...
of
...
ball-bearing
...
systems
...
is
...
to
...
use
...
a
...
Tension/Compression
...
(T/C)
...
Isolator
...
...
for
...
each
...
bearing.
...
If
...
the
...
bearings
...
and
...
races
...
serve
...
as
...
a
...
hub
...
at
...
the
...
center
...
of
...
a
...
larger
...
wheel-truss
...
system
...
or
...
another
...
rotating
...
assembly,
...
it
...
may
...
be
...
sufficient
...
to
...
model
...
one
...
T/C
...
isolator
...
per
...
set
...
of
...
rollers
...
tributary
...
to
...
each
...
spoke
...
or
...
radial
...
component.
...
The
...
types
...
of
...
motion
...
to
...
be
...
resisted
...
include
...
radial,
...
tangential,
...
and
...
longitudinal.
...
Due
...
to
...
the
...
reduced
...
friction
...
coefficient
...
of
...
the
...
roller
...
bearings,
...
tangential
...
resistance
...
may
...
be
...
small
...
relative
...
to
...
the
...
radial
...
resistance
...
which
...
results
...
from
...
the
...
force
...
component
...
normal
...
to
...
the
...
bearing.
...
A
...
small
...
gap
...
may
...
also
...
be
...
present.
...
The
...
kinematics
...
of
...
this
...
gap
...
may
...
be
...
accounted
...
for
...
with
...
the
...
type
...
and
...
sequencing
...
of
...
analysis
...
methods.
...
Finally,
...
longitudinal
...
resistance
...
comes
...
from
...
the
...
force
...
component
...
normal
...
to
...
the
...
bearings
...
due
...
to
...
their
...
axes
...
not
...
being
...
aligned
...
with
...
the
...
axis
...
of
...
the
...
overall
...
system.
...
Use
...
of
...
a
...
T/C
...
isolator
...
link
...
will
...
incorporate
...
a
...
gap
...
in
...
compression,
...
and
...
will
...
allow
...
for
...
friction
...
in
...
the
...
tangential
...
and
...
longitudinal
...
directions.
...
Circumferential
...
and
...
longitudinal
...
friction
...
coefficients
...
should
...
be
...
resolved
...
or
...
decided
...
upon
...
as
...
input
...
parameters.
...
Links
...
should
...
be
...
drawn
...
perpendicular
...
to
...
the
...
roller
...
axes,
...
and
...
should
...
be
...
connected
...
to
...
the
...
outer
...
moving
...
surface.
...
The
...
links
...
may
...
need
...
to
...
be
...
assigned
...
advanced
...
local
...
axes
...
such
...
that
...
friction
...
coefficients
...
may
...
be
...
oriented
...
along
...
the
...
circumferential
...
and
...
longitudinal
...
directions.
...
If
...
there
...
is
...
no
...
gap
...
between
...
the
...
bearings
...
and
...
the
...
contact
...
surface,
...
a
...
...
static
...
analysis
...
may
...
be
...
used
...
to
...
generate
...
results.
...
However,
...
if
...
a
...
gap
...
is
...
present,
...
the
...
model
...
will
...
be
...
initially
...
unstable,
...
and
...
a
...
nonlinear
...
static
...
solution
...
will
...
not
...
work.
...
As
...
an
...
alternative,
...
load
...
may
...
be
...
applied
...
using
...
a
...
...
...
analysis
...
.
...
Here,
...
a
...
nonlinear
...
...
...
may
...
be
...
defined
...
for
...
application
...
of
...
the
...
assembly
...
self-weight,
...
then
...
any
...
additional
...
combination
...
of
...
loads
...
may
...
be
...
set
...
to
...
continue
...
from
...
the
...
end
...
of
...
this
...
nonlinear
...
analysis.
...
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Related Incidents:
|
See Also
Wikipedia article
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TO DO: |