Using Spectral Methods to Analyse Vibration Eigenfrequencies of the ISS Structures and Peak Noise Values of the Angular Velocity Meter

The study presents spectral analysis methods for identifying actual natural frequencies of the International Space Station structures, as well as methods for determining noise values of the angular velocity meter. We suggest using Fourier transforms to obtain frequency spectra of the existing telemetry data. We analysed several regions of telemetry data listing ISS angular velocity values obtained via the angular velocity meter. We show that the eigenfrequencies and their ranges determined by analysing these telemetry data spectra are in good agreement with theoretical values. We determined peak noise values of the angular velocity meter used at the ISS, based on the spectrum regions where there are no pronounced excited eigenfrequencies of the structure. The noise values obtained are in good agreement with values found in the angular velocity meter specification

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