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Message ID: 10694
Entry time: Mon Nov 10 23:14:20 2014
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| Author: |
rana |
| Type: |
Summary |
| Category: |
SUS |
| Subject: |
SRM: damping gains & Optical Lever servo Tune-up |
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- tweaked gains for POS, PIT, YAW, SIDE by ~10-20% to get nice ringdowns with Q~5.
- Measured bounce rool freqs = 16.43 / 23.99 Hz. Updated the Mech Res Wiki page. Tightened up the bandstops to get back a few deg of phase. Propagated these new bandstops into the SRM SUS damping filter banks.
- Made and turned on a LP filters for the loops.
- Added a ~0.3 Hz gain boost / bubble.
- Set UGF to be ~2.5x below where it rings up. Estimate this to be ~3.5 Hz.
- First PDF shows bounce/roll peaks in OSEMs. Notice how f_roll is > sqrt(2)*f_bounce. ??
- Second PDF shows the OL spectra with the loops on/off. Previously there was no Boost and no LP (!!) turned on.
- 3rd PDF shows the modeled Bode plot of the OLG. yellow/blue is boost off/on
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