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BRUEL & KJAER System V - Protective Can and Guidance Pins for the Head; The Mode Study Head Type 4814

BRUEL & KJAER System V
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The
upper
radial
flexures
are
attached
to
the
lower
surface
of
the
table
by
a
combination
of
bolts
and
high
strength
adhesive
at
the
outer
edge.
The
lower
radial
flexures
are
at-
tached
by
bolts
and
high
strength
adhesive
to
a
stiff
platform
formed
integral
with
the
skeleton.
The
skeleton
is
machined
from
a
single
piece
of
aluminum
. A
closely
controlled
machin-
ing
process
causes
the
moving
element
to
have
a
high
resonant
frequency
and
very
little
unbalanced
mass
to
cause
cross
motion
problems.
6.1.
9 .
Boot
The
boot
is a
rubber
diaphragm
bonded
to
the
outer
skirt
of
the
table
and
extending
out
to
the
protective
can
. It
prevents
dirt
and
debris
from
falling
into
the
exciter.
A
clamping
ring
hold
s
the
outer
edge
of
the
boot
to
the
protective
can
.
6.1.10.
Protective
Can
and
Guidance
Pins
for
the
Head
The
protective
can
for
the
Head
provides
a
stable
base
for
the
Exciter
Head
when
the
Ex-
citer
Head
is
not
on
the
Exciter
Body.
It
also
protects
the
driver
coil
and
the
moving
ele-
ment
.
Set
in
the
supporting
ring
of
the
protective
can
are
three
guidance
pins,
which
serve
to
line
up
the
Head as
it
is
being
placed
on
the
Body
and keep
the
drive
coil
from
being
bumped
against
the
sides
of
the
opening
during
placement
and
removal.
6.2.
THE
M
ODE
ST
UDY
HEAD
T
YP
E
4814
Fig .
6.7
shows
an
illustration
of
the
Mode
Study
Head
Type
4814
with
its
rubber
boot
and
protective
can
removed.
The
construction
of
the
Type
4814
Head
is
basically
the
same
as
that
of
the
previous
three,
with
the
following
differences:
1.
The
Type
4814
is
provided
with
a
19
mm
(0
,
75
in)
diameter
table
with
one
centrally
located
mounting
point.
~
::=::::;;:>
"""'
~
d!
~
3C:~:&:
:::;;;;;;~~
~
;++-
___
Mount
i
ng
point
v"
ith
repl
acea
ble insen
""--k-
""'--;
~~
--
U
pp
er
radial
fle
xu
re
Mou
nting
ha
le
s
for
prOtective can
F
ra
me
Overtravei
stop
Moving
element
skeleton·rib
edge
__________
~
Tangential fle xure
----------
Spl
it
hub
~~
L-
--------
Dr
ive
r
Co
il
27'
402
F/g.
6.7.
Mode
Study
Head
Type
4814
38

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