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DC Data Analysis SEI/SUS (Suspensions & Seismic Isolation) 

DC Data Analysis SEI/SUS (Suspensions & Seismic Isolation) . DC Workshop, Golm 2002-02-21 Karsten Kötter. power spectra / psd. checked Matlab psd/pwelch algorithm to get power spectral densities / spectra right. psd / pwelch. Matlab psd function scaling not clear Matlab pwelch function

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DC Data Analysis SEI/SUS (Suspensions & Seismic Isolation) 

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  1. DC Data Analysis SEI/SUS (Suspensions & Seismic Isolation)  DC Workshop, Golm 2002-02-21 Karsten Kötter Karsten Kötter

  2. power spectra / psd • checked Matlab psd/pwelch algorithm to get power spectral densities / spectra right Karsten Kötter

  3. psd / pwelch • Matlab psd function • scaling not clear • Matlab pwelch function • calculates correctly power spectral densities • conversion to power/amplitude spectra not possible • conversion factor ENBW ("Equivalent Noise BandWidth") is not given Karsten Kötter

  4. Spectral density - pwelch Karsten Kötter

  5. asd script • wrote Matlab script to calculate • asd (amplituide spectral density) • ENBW • allows you to calculate asd, psd, as, ps Karsten Kötter

  6. Spectral density - asd Karsten Kötter

  7. Spectrum - asd Karsten Kötter

  8. Comparison ACC/SEIS sensors • compared ACC sensor signals to SEI sensor signal • consistency check for calibration functions Karsten Kötter

  9. Karsten Kötter

  10. Comparison ACC/SEIS sensors Karsten Kötter

  11. Coherence seismic - MI output • calculated coherence function between LSC_MID_EP-P and seismic channels • check whether sensitivity is limited by seismic motion in some frequency bands Karsten Kötter

  12. Coherence seismic - MI output Karsten Kötter

  13. SEI_TFN_ACC-Y-ST3 Karsten Kötter

  14. coherence plots - results • output dominated by noise from TFN at 8-10 Hz • mechanical resonance in suspension (horizontal mode of stack rubber layer) Karsten Kötter

  15. coherence plots - results Karsten Kötter

  16. evolution of signals over c.run Karsten Kötter

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