Oli P,  Ibrahim A, Betsy W

The first transfer functions were taken for the top stage of the BBSS a couple of weeks ago (75211), and we have been working on plotting these transfer functions against their models. We have finally been able to do this (pdf), and what we see is a pretty good match to what we expected to see. Plots 1 - 6 of the pdf (also attached as pngs) are the transfer functions for each individual degree of freedom compared against the model's result for that degree of freedom. Plots 7 - 12 compare the measured and model TFs between dof's that tend to couple into each other. Pages 13 - 18 compare each measured and modeled dof to the OSEMs that make up that dof.
Here are the plots for M1 L to L, M1 T to T, M1 V to V, M1 R to R, M1 P to P, and M1 Y to Y. The results are similar to what we noticed when manually comparing the location of the peaks.

Scripts Used
The original BBSS model is a Mathematica notebook found at $(sussvn)/Common/MathematicaModels/TripleLite2/mark.barton/20211212bbss/production/stdcalc/ASUS3L2ModelCalcPlots.nb.

The default model parameters in Matlab can be found at $(sussvn)/Common/MatlabTools/TripleModel_Production/bbssopt.m. Then, $(sussvn)/BBSS/Common/MatlabTools/plotBBSS_dtttfs_M1.m was run to grab the data from the transfer functions we ran and plot them against the theoretical models.

The results are found in $(sussvn)/BBSS/X1/BS/SAGM1/Results/2024-01-05_1000_X1SUSBS/.

Questions we have:
- Why are the measured magnitudes higher than the model magnitudes?
    After looking over it for around 4 hours and getting some help from Jim and Rahul, we could not figure out whether the discrepency was due to:
    - an incorrect calibration factor (the 1.5404 is a calibration factor that was a remenant from the BSFM script who's values seem to make sense)
    - an issue with the filter units on the test stand or dtt
    - an issue with the model
    - turbulance from cleanrooms
    - something else??
- What's up with Pitch?
    Seems coupled to "V", which should have expected coupling but not in this peak (according to model). Ideas are:
    - issue with model? Were "new wire lengths" added to model params?
    - issue with how we built it? Pitch being off can sometimes indicate an issue with the location of the center of mass
    - something else?
- What's with noisy P to "any other DoF" coupling traces?
    There is terrible coherence.
    - Some mechanical issue? No rubbing from inspection ~month ago
    - Some DTT issue? There are no GDS overflows/railing (which is what caused the problem last time) when running TFs
    - Something else?

Next steps:
- Take many measurements of different parts of the BBSS and make sure they are within their build tolerance, as well as double checking that all updates to the build have been included in the model parameters.
- Make any adjustments to the build or model that are needed.
- Rerun TFs and see if the new results make sense.