BRUEL & KJAER System V - Exciter Body 4805; Exciter Heads; High G Head Type 4811

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9. 2. E XCITER BODY 4805
Dimensions:
Diameter 236 mm (9,25 in) approx . Height 246 mm (9 ,7 in). See also
Fig .9.3
Weight:
40 kg (90 Ib)
Cooling:
For full force output , a cooling air flow of 0,42 m
3
/ min . at a pressure
of 0 , 008 kg/ cm
2
is necessary
9.3. EXCITER HEADS
The following specifications apply when the Exciter is powered by a Power Amplifier
Type 2707 .
9.3.1. High g Head Type 4811
Rated Force:
Static:
Acceleration Limit:
(bare table)
Current Limit:
Displacement limit:
Velocity limit:
Moving Element Dynamic Mass :
Resonance Frequency
Unloaded Table :
Stray Magnetic Field :
Mounting Surface:
Mechanical Fuse Inserts:
Cross Motion :
Fle
xure Stiffness:
Side load Capability:
Head Constant:
58
380 N (85Ibf) when mounted on the 4801 Body
248 N (56Ibf) when mounted on the 4805 Body
See also Fig. 7.4 for acceleration, velocity and displacement limits
120 N (27Ibf)
210g (2060m / s
2
)
when mounted on 4801
140 g (1370 m/ s
2
)
when mounted on 4805
20 A RMS with cooling
10 ARMS without cooling
12,7 mm (0,5 in), continuous
14 mm , (0,55 in) between stops
1,27 m / s (50 in / s)
0,18 kg (0,4 Ib)
8,5 kHz
See
curves, Figs. 6.4, 6 .5
Hardened anodiz ed aluminum
Centre insert plus four outer inserts equally spaced on a 50,8 mm
(2,00 in) diameter circle. Side of square 35,9 mm (1,414 in)
Less
than 10 % of the axial motion to 3 ,5 kHz
17,5 N/ mm, (100 Ib fl in)
A
mass of 2,3 kg, (51b). with centre of gravity 50 mm, (2 in) above the
centre of the table, can be vibrated in the horizontal direction over the
full frequency range
69 mm / Vs (2 ,7 in/ Vs)
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