[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
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