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

机译：使用光纤传感器对AMS星型追踪器原型进行动态测量

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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.
机译：AMS_02（阿尔法磁谱仪）空间实验的AMICA（用于姿态仪的天文绘图仪）星型跟踪器支架（ASTS）的铝制原型已装备了光纤布拉格光栅（FBG），用于在动态过程中获取应变场测试。激励是通过仪器上的冲击锤提供的。结构的机械响应由名义上位于同一位置的表面粘结FBG和加速度计提供。记录了所有时间历史，并转换到频域以从FBG检索频率响应函数（FRF）-从加速度计检索到应变频率响应函数（SFRFs）-两者都提供了ASTS的共振频率和位移（应变）形状。已经对该结构进行了数值模拟以预测上述动态特征。在两种方法之间的两个第一个弯曲模式中找到了很好的一致性，并在数值分析中找到了很好的一致性。

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