J. Kissel

H1 ISI HAM4's tuned mass dampers have been retuned to match the first bending mode of HAM ISI blade springs post spring-tip-damper install (~139 Hz). Attached are the results for all three TMDs (pg. 1: before and after tuning; pg. 2: after tuning, compared against the blades).

Corner 2 and 3 of the retuned TMDs have been re-installed by Hugh shortly after this data was taken, Corner 1 will come a bit later. Pictures to come.

Details of the measurement setup are as described in LHO aLOG 38741.