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

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

Dynamic measurements on a star tracker prototype of AMS using fiber optic sensors

A CUSANO
;
S CAMPOPIANO;CUTOLO A;
2006

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) space experiment has been instrumented with fiber Bragg gratings (FBGs) for the acquisition of strain fields during dynamic tests. The excitation has been provided by an instrumented impact hammer; the mechanical response of the structure was provided by surface bonded FBGs and accelerometers nominally in the same location. All time histories have been recorded, transformed into the frequency domain to retrieve frequency response functions (FRFs)-from accelerometers-and strain frequency response functions (SFRFs)-from FBGs, both providing resonant frequencies and displacement (strain) shapes of the ASTS. Numerical simulations of this structure have been performed to predict the aforementioned dynamic features. Good agreement was found for the two first bending modes between the two approaches and in turn with the numerical analysis.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12070/216
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