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BRUEL & KJAER System V - Static Load Limitations

BRUEL & KJAER System V
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Although
no
trunnion
is
provided
for
the
Type
4805
body
it
can
be
easily
used in a
hori-
zontal
position
by
laying
it
on
some
cushioning
material,
as
shown
in
Fig.3.2
. The
Exciter
could
also be
suspended
from
a
crane
using
the
four
10
mm
metric
threaded
holes
in
the
base
of
the
Body
to
fasten
it
to
a
plate.
See
Fig.3
.3.
Dimensions
of
the
plate
shown
are
given
in
Fig.9.4.
3 .
8.
STATIC
LOAD
LIMITATIONS
The
amount
of
dead
weight
that
can
be placed
upon
the
shaker
is a
function
of
three
things:
the
flexure
system
of
the
Head
used,
the
vertical
centering
capability
of
that
par-
ticular
Body
/ Head
combination,
and
the
test
conditions
.
The
flexure
stiffness
for
the
High
g Head is
17
,5 N/
mm
(100
Ibf/inl,
that
of
the
General
Purpose
and
Big Table
Heads
is 21 N/
mm
(120
Ibf/in)
.
The
maximum
allowable
displace-
ment
from
the
horizontally
centered
position
to
fully
deflected
downward
position
is
6,35
mm
(0
,
25
in).
This
means
that
the
maximum
static
load
which
the
flexures
alone
can
bear
is
110
N
(25
Ibf)
and
133
N
(30
Ibf)
respectively
.
Fig
.3. 3.
Panel
excitation
with
a
suspended
4805
/ 14
The
graph
in Fig .
3.4
shows
the
effect
of
static
loading
on
available
displac
e
ment
for
the
three
Heads.
Using
the
Power
Amplifier
Type
2707,
it
is
possible
to
supply
a DC
voltage
to
the
drive
coil
of
the
shaker
and
thereby
raise
or
lower
the
table
level.
The
total
amount
of
force
available
depends
on
the
type
of
drive
coil
in
the
Head
and
the
type
of
Body
used.
20

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