The following table reports the frequency of all resonances as measured from TF and PSDs.
| IM1 | IM2 | IM3 | IM4 | |
|---|---|---|---|---|
| Yaw | 0.707 | 0.723 | 0.740 | 0.701 |
|
P/L 1 (mostly P) |
0.939 | 0.893 | 0.910 | 0.926 |
| P/L 2 (mostly L) | 1.041 | 1.006 | 1.021 | 1.035 |
| Trans | 0.996 | 0.996 | 0.996 | 0.996 |
| Bounce | 6.19 | 6.17 | 6.14 | 6.18 |
| Roll | 9.03 | 9.02 | 9.03 | 9.03 |
HAUX have no explicit fine adjustment to exactly match any of the resonances. However, Yaw is affected by the horizontal distance of the blade tips, can vary a bit during alignment is not usually checked agaist any reference. According to the model, 1 mm of difference in that distance translate in about 0.03 Hz of differece in Yaw resonance. If we have time, we can try playing with the blades to bring the yaw resonances closer...
Friday we re-installed ECD on all suspensions, adjusted the DC pitch of IM4 (that changes when you install ECDs) and run an OSEM calibration (using the same optical lever used for pitch balancing). We plan to do the same with the remaining suspensions Today, and have them ready for more (and possibly final) TF and PSDs tonight.