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Entry  Tue Jun 14 18:45:43 2022, Anchal, Update, SUS, LO2 lower magnets are stuck in coil, won't come off 
    Reply  Tue Jun 14 19:34:06 2022, yuta, Update, SUS, Resonant frequency identification from the free swing test 7x
       Reply  Thu Jun 16 18:30:07 2022, Anchal, Update, SUS, New diagonalized input matrices applied SUSInpMatDiag_MC1_MC2_MC3_BS_IMTX_ETMX_ETMY_AS1_AS4_SR2_PR2_PR3.pdf
          Reply  Tue Jun 21 08:36:50 2022, Anchal, Update, SUS, Diagonalized input matrices for LO1, freeSwing on ITMY and ITMX SUSInpMatDiag_LO1.pdf
    Reply  Wed Jun 15 15:07:07 2022, Koji, Update, SUS, LO2 SUS stuck fixed Screenshot_2022-06-15_15-00-22.pngScreenshot_2022-06-15_15-00-40.png
Message ID: 16914     Entry time: Tue Jun 14 19:34:06 2022     In reply to: 16913     Reply to this: 16925
Author: yuta 
Type: Update 
Category: SUS 
Subject: Resonant frequency identification from the free swing test 

[JC, Anchal, Yuta]

We are working on resonant frequency idendification from the free swing test done last weekend.
Table below is the resonant frequencies identified, and attached are the plots of peak identification for some of our new suspensions.
To identify the resonant frequencies, the kicks were done in each degrees of freedom so that we can assume, for example, SUSPOS will be mostly excited when kicked in POS and the heighest peak is at the POS resonant frequency.
For PR3, AS1 and ETMY, the resonant frequency idendification needs to be done in the order of POS, PIT, YAW, SIDE and identified frequencies need to be removed when finding a peak.
Other than that, the identification was done without any prior assumptions on the suspensions.
For ITMY, ETMY, PR2, PR3, AS1, AS4, yaw has lower resonant frequencies than pitch, as opposed to other suspensions.
For LO1, POS and PIT frequencies might be swapped because LLCOIL is not working (40m/16898) and POS/PIT kicks both might be excited SUSPOS/PIT.
LO1 coil output matrix was temporarily modified so that we use only two coils for POS/PIT/YAW excitation (Attachment #7), as we did for ITMY (40m/16899).

The scripts for the free swinging test and analysis live in /Git/40m/scripts/SUS/InMatCalc

     POS    PIT    YAW    SIDE
BS   0.990  0.748  0.794  0.959 
ITMY 0.987  0.739  0.634  0.948 fPIT > fYAW
ETMY 0.979  0.816  0.649  0.954 fPIT > fYAW
ITMX 0.978  0.586  0.758  0.959 
ETMX 0.962  0.725  0.847  1.000 
PRM  0.939  0.541  0.742  0.990 
PR3  1.019  0.885  0.751  0.989 fPIT > fYAW
PR2  0.996  0.816  0.724  0.999 fPIT > fYAW
SRM  0.969  0.533  0.815  0.985 
SR2  0.978  0.720  0.776  0.997 
LO1  0.926  1.011  0.669  0.993 POS AND PIT MIGHT BE SWAPPED
LO2  0.964  0.998  0.995  0.990 WRONG DUE TO STUCK (40m/16913)
AS1  1.028  0.832  0.668  0.988 fPIT > fYAW
AS4  1.015  0.800  0.659  0.991 fPIT > fYAW
MC1  0.967  0.678  0.797  0.995 
MC2  0.968  0.748  0.815  0.990 
MC3  0.978  0.770  0.841  0.969 
Attachment 1: LO1.png  1.088 MB  Uploaded Tue Jun 14 21:57:17 2022  | Hide | Hide all
LO1.png
Attachment 2: AS1.png  1.122 MB  Uploaded Tue Jun 14 21:57:30 2022  | Hide | Hide all
AS1.png
Attachment 3: AS4.png  1.098 MB  Uploaded Tue Jun 14 21:57:41 2022  | Hide | Hide all
AS4.png
Attachment 4: PR2.png  1.039 MB  Uploaded Tue Jun 14 21:57:49 2022  | Hide | Hide all
PR2.png
Attachment 5: PR3.png  1.063 MB  Uploaded Tue Jun 14 21:57:57 2022  | Hide | Hide all
PR3.png
Attachment 6: SR2.png  1.061 MB  Uploaded Tue Jun 14 21:58:05 2022  | Hide | Hide all
SR2.png
Attachment 7: Screenshot_2022-06-14_21-07-09.png  15 kB  Uploaded Tue Jun 14 22:07:21 2022  | Hide | Hide all
Screenshot_2022-06-14_21-07-09.png
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