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How Do I Get Articulation Index (AI) vs. Speed?

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Use the following sequence to get the Articulation Index (AI) vs rotational speed:

  1. Perform waterfall analysis on your noise signal (+ tacho). This gives you a standard waterfall display
  2. On the waterfall result perform the analysis
    Analysis->Noise, Vibration and Harshness->Spectrum Input->Sound Quality Auto Extract
    Number of Cylinders = x  (set to appropriate value)
    Write metrics to Input dataset = True
    Set required metric to True

In this case select either $AI_ANSI or $AI_VEH.
These are different calculations with
AI_ANSI is calculated in the range 0 to 1
AI_VEH is calculated as percentage in range 0 to 100

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Dr Mike Donegan

Senior Software Engineer at Prosig
Mike graduated from the University of Southampton in 1979 and then went on to complete a PhD in Seismic Refraction Studies in 1982. Mike joined Prosig as a special applications engineer. He now researches & develops new algorithms for Prosig's DATS software and assists customers with data analysis issues.

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