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BRUEL & KJAER System V - Side Overload Pads; Moving Element Skeleton

BRUEL & KJAER System V
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is
aluminum
to keep
the
mass
of
the
moving
element
as
low
as
possible.
The
wire
has
a
very
thin
high
temperature
insulation
which
takes
up
as
little
space as
possible,
thereby
reducing
the
generated
heat
by
allowing
a
larger
wire
size
to
be
used.
6.1.7.
Side
Overload Pads
On
each side
of
the
ribs
of
the
skeleton,
just
above
the
drive
coil,
is
located
a
small
raised area (see Fig .
6.6).
These are
the
side
overload
pads,
whose
function
is
to
protect
the
driver
coil
from
rubbing
against
the
centre
post.
These
pads
should
not
be
permitted
to
rub
for
any
length
of
time
.
When
unusually
heavy
side
loads
or
specimens
with
possi-
blyexcessive
side
moments
are
mounted
on
the
table,
the
acceleration
waveform
should
be
monitored
on
an
oscilloscope.
Side Overload Pads
Fig. 6. 6.
Side
overload
pads
6.1.8.
M oving
Element
Skeleton
The
moving
element
skeleton
is a
high
strength
aluminum
alloy
structure
that
attaches
all
of
the
parts
of
the
moving
element
together.
It is
designed
to
provide
the
best
possible
coupling
of
the
force
generated
by
the
driver
coil
at
one
end
to
the
test
object
attached
to
the
table
at
the
other
end
within
the
limitation
set
by
the
allowable
weight
of
the
moving
element.
The
driver
coil
is
attached
to
the
lower
end
of
the
skeleton.
The
force
transmitted
to
the
skeleton
from
the
driver
coil
passes
upward
through
four
triangular
shaped
load
distribut-
ing
gussets
into
the
four
ribs
of
the
skeleton
and
into
the
four
rib. edge
stiffeners.
The
ribs
and
rib
edge
stiffeners
pass
the
force
upwards
to
the
table.
The
centre
insert
of
the
table
is a
continuation
of
the
intersection
of
the
ribs. The
outer
four
inserts
are
continua-
tions
of
the
rib
edge
stiffeners.
The
design
is
such
that
approximately
equal
stiffness
ex-
ists
between
the
driver
coil
and
each
of
the
inserts,
so
that
deformation,
or
"diaphragm-
ing"
of
the
table
top
surface
is
small,
thus
minimizing
any
damage
to
the
test
object
that
might
be
caused
by base
bending.
37

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