Abstract
An aluminum prototype of the AMICA (astro-mapper for instrument check of attitude)star tracker support (ASTS) of the AMS_02 (alpha magnetic spectrometer) spaceexperiment has been instrumented with fiber Bragg gratings (FBGs) for the acquisition ofstrain fields during dynamic tests. The excitation has been provided by an instrumentedimpact hammer; the mechanical response of the structure was provided by surface bondedFBGs and accelerometers nominally in the same location. All time histories have beenrecorded, transformed into the frequency domain to retrieve frequency response functions(FRFs)—from accelerometers—and strain frequency response functions (SFRFs)—fromFBGs, both providing resonant frequencies and displacement (strain) shapes of theASTS. Numerical simulations of this structure have been performed to predict theaforementioned dynamic features. Good agreement was found for the two firstbending modes between the two approaches and in turn with the numerical analysis.
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