Last week with Andres's help I measured resonance frequencies on SR2 in the double and single hang cases (top locked on stops and middle locked on stops respectively). This log reports the results of fitting the hsts model to that data. The adjusted parameters are listed below with the estimated error bars. Typically I allow d1 (top mass spring tip height) to move. Interestingly, the model had better results when the height of the bottom mass prism was allowed to move instead. Floating d1 did allow the resonances to line up with similar precision, however d1 and I1y  would drift very far from their nominal positions to do this, about 5 mm on d1 and 50% on I1y.

The attachment H1SR2_ModelFit_17Feb2014.pdf shows the measured transfer functions against the nominal model and the model fit. The measured L-P/P-L and T-R/R-T TFs do not show good symmetry, so those comparisons should be taken with a grain of salt. Likely the OSEM balancing is poor as poor balancing will cause errors in the measured zero locations. Similarly, the 1.5 Hzish zero on the measured Roll to Roll TF is probably slightly off from reality. It does not correspond exactly to the measured double hang Roll resonance as it should, and it is also somewhat off from other HSTS suspensions.

The attachment H1L1SR2comparison_17Feb2014.pdf shows the same results but against L1SR2. The new model also fits L1SR2 better, though there are some minor differences.

The new parameter file is on the svn at ...sus/trunk/Common/MatlabTools/TripleModel_Production/hstsopt_H1SR2fit.m

The model fitting code for H1SR2 is on the svn at ...sus/trunk/Common/MatlabTools/TripleModel_Fit/TripPend_GaussNewton_fit_v5_H1SR2.m


Change in parameters from original model with the estimated minimum errors
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d4: -1.6798 +- 0.094782 mm
I1x: -6.3844 +- 1.2588 %
I2x: -5.2885 +- 11.4653 %
I3x: -3.706 +- 12.1017 %
I1y: 8.8773 +- 0.61371 %
I2y: -5.583 +- 0.5374 %
I3y: -4.6949 +- 0.36401 %
I1z: -5.7573 +- 0.9752 %
I2z: 1.2902 +- 1.0012 %
I3z: -3.2293 +- 0.30808 %
l1: 5.5655 +- 3.3226 mm
l2: 4.2327 +- 0.52961 mm
l3: 1.4169 +- 0.40356 mm
kc1: -1.2835 +- 1.2589 %
kc2: 2.4943 +- 0.4258 %
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