29 August 2018 MST - Night 5 - Vibration Mitigation, 20 iter FF Matrix

Summary

Date: Thu, 30 Aug 2018 07:45:02 -0700
From: Doug Miller 
To: AOGroup 

Tonight we experience fairly strong vibrations all night.  More vibration data
was collected and a new 20 iteration Feed Forward Matrix.  Guido said he
will take a look at the FF data today.

Date: Thu, 30 Aug 2018 15:10:40 -0700
From: Doug Miller 
To: AOGroup 

My previous conclusion that turning off LN improved (decreased) the
vibration character of the 4D measurements was incorrect.  Bottom line
is I had taken several early measurement on 20180829 with only 300 samples,
so the analysis would be quicker, and later took 1000 samples.  The
300 sample data has about the same total power in the 12.7 Hz as the 1000 frame
sets but the peak was much broader and thus the peak reported much lower.

Thus, turning off the LN power seems to have made almost no difference in
the vibration spectrum of the 4D measurement.

Doug

In the plot labels, time in UT is reported as HHMMSS.  Thus, 101200
is 10:12:00.  The exception is the low vibration data displayed as a goal
from 2013 labeled as 20130826.

LN power was turned off at about 10:00:00

I would suggest, however, that LN remains off while we are collecting 4D data.

Note, the 12.7 Hz vibration was much worse on 20180830 than on 20180829.

10:00 Start 4D work

led-green Flattening (640 modes) to 47 nm RMS

10:08 SetFlatAO
  • 595 modes

10:17 Rest and SetFlatAO
  • 563 modes
  • Cur -0.27, 0.048
  • Flats:
    flat1_1.jpg
  • Flats:
    flat1_2.jpg

10:25 Flattening
  • AdOpt> print, opt_int_mat_reduce2(400, track='20180828_123635')
  • AdOpt> print, opt_int_mat_reduce2(640, track='20180828_123635')
  • AdOpt> print, opt_int_mat_reduce2(640, track='20180828_123635')
  • IDL> print, hexalign(/apply)
  • AdOpt> print, opt_int_mat_reduce2(640, track='20180828_123635')
  • 47 nm
  • Flats:
    flat2_1.jpg
  • Flats:
    flat2_2.jpg

led-green Vibration Data

10:36 Vibration Set
  • 20180830_103600_noise
  • HBS On
  • Az Drives On
  • Stow Pins Out

11:16 Vibration Set
  • 20180830_111600_noise
  • HBS On
  • Az Drives On
  • Stow Pins Out
  • OVMS:
    OVMS_111400.jpg

11:23 Steve and Josh turn off Tree House Fans
  • HBS On
  • Az Drives On
  • Stow Pins Out

11:29 Vibration Set
  • 20180830_113000_noise
  • 20180830_113100_noise
  • 20180830_113200_noise
  • OVMS:
    OVMS_112800.jpg

led-green 20 Iteration, modal with FF

12:08 Measure 20 Iteration FF Matrix
  • From IDL AdSec Control Terminal
    • AdOpt> print, fsm_load_program(/AUTO)
    • AdOpt> print, fsm_set_flat(/ff, /no_flat)
    • AdOpt> tn = tracknum()
    • AdOpt> print, tn
      • 20180830_120714
    • AdOpt> print, ff_acquire_v2(tn) 08:48
      • /local/aomeas/adsec_calib/ff_matrix/20180830_120714
  • New AdOpt> terminal because above one didn't return
    • AdOpt> print, fsm_rip()

14:07 Process FF Matrix
  • IDL> print, reduce_ff_data('20180830_120714', /do_plot)
  • Normalized Chi^2 ff_matrix: 118.32993 DOF: 7978176
  • Feed Forward with 20 Iterations:
    ff20_1.jpg
  • Feed Forward with 20 Iterations:
    ff20_2.jpg
  • Feed Forward with 20 Iterations:
    ff20_3.jpg
  • Feed Forward with 20 Iterations:
    ff20_4.jpg

13:40 SetFlatAO from AdSec Control GUI
  • 640 modes
  • /local/aomeas/adsec_calib/flat/20180830_134720/flattening_result.sav

led-green Vibration Data

13:50 Vibration Data
  • 20180830_135800_noise
  • 20180830_140000_noise
  • 20180830_140100_noise

-- %USERSIG{DougMiller - 2018-08-30}%
I Attachment Action Size Date Who Comment
OVMS_111400.jpgjpg OVMS_111400.jpg manage 608 K 30 Aug 2018 - 14:34 DougMiller OVMS
OVMS_112800.jpgjpg OVMS_112800.jpg manage 597 K 30 Aug 2018 - 14:34 DougMiller OVMS
ff20_1.jpgjpg ff20_1.jpg manage 231 K 30 Aug 2018 - 14:17 DougMiller Feed Forward with 20 Iterations
ff20_2.jpgjpg ff20_2.jpg manage 176 K 30 Aug 2018 - 14:17 DougMiller Feed Forward with 20 Iterations
ff20_3.jpgjpg ff20_3.jpg manage 353 K 30 Aug 2018 - 14:29 DougMiller Feed Forward with 20 Iterations
ff20_4.jpgjpg ff20_4.jpg manage 231 K 30 Aug 2018 - 14:29 DougMiller Feed Forward with 20 Iterations
flat1_1.jpgjpg flat1_1.jpg manage 239 K 31 Aug 2018 - 10:18 DougMiller Flats
flat1_2.jpgjpg flat1_2.jpg manage 125 K 31 Aug 2018 - 10:18 DougMiller Flats
flat2_1.jpgjpg flat2_1.jpg manage 202 K 31 Aug 2018 - 10:18 DougMiller Flats
flat2_2.jpgjpg flat2_2.jpg manage 138 K 31 Aug 2018 - 10:18 DougMiller Flats
Topic revision: r5 - 12 Oct 2018, JohnHill
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