From: Berend Winter
[bw@mssl.ucl.ac.uk]
Sent: 29 October 2001 15:37
To:
Peterson, Don via IEEE; COMDEV John Hackett; COMDEV Dwight Caldwell; UofS Joe
Taylor
Cc: MSSL Chris Brockley-Blatt
Subject: Herschel/SPIRE
updated shutter random vibration specification
Hello, We have updated the random vibration
definition for the shutter.
Durartion 120 seconds, and qualification
levels in S/C coordinates:
X-axis:
20 - 150
Hz +9 dB/oct
150 - 300 Hz 0.25
g2/Hz
300 - 2000 Hz -9
dB/oct
This amounts to about 8
g-rms
Y-axis:
20 - 100
Hz +9 dB/oct
100 - 200 Hz 0.80
g2/Hz
200 - 2000 Hz -9
dB/oct
This amounts to
about 14 g-rms
Z-axis:
20 - 100
Hz +9 dB/oct
100 - 200 Hz 0.50
g2/Hz
200 - 2000 Hz -9
dB/oct
This amounts to
about 11 g-rms
Any problems with this? Overall lower than before but different in
frequency range.
Cheers, Berend
------------------------------------------------------------------------------------------------
Berend
Winter
Mullard Space Science Laboratory (MSSL)
bw@mssl.ucl.ac.uk
University College London
Tel +44 1483 204215 Holmbury St.
Mary
Fax +44 1483 278312 Dorking, Surrey, RH5 6NT,
UK
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