Prosig Support Blog

The place to come for support for Prosig's DATS, P8000 & PROTOR

Prosig Support Blog - The place to come for support for Prosig's DATS, P8000 & PROTOR

How Do I Get An XYZ Resultant Waterfall

A user has three signals captured using a triaxial accelerometer and asked “What is the simplest way to get the XYZ resultant from run-up file?” He had tried forming a resultant of the raw time histories, but didn’t fully understand the resultant time history.

Of course, the correct way of processing the data is to calculate the individual waterfalls from the x, y & z data and then calculate a resultant waterfall. Continue reading

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

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