lang="en-US"UTF-8 Dr Mike Donegan, Author at Prosig Support Blog class="archive author author-mike-donegan author-15 custom-background custom-background-image group-blog blogolife-3_0_7 unknown"

Prosig Support Blog

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

Prosig Support Blog

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.

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.

3440class="post-3440 post type-post status-publish format-standard hentry category-dats category-signal-processing category-tutorial tag-asd tag-auto-rms tag-auto-spectrum tag-dsp tag-ensemble-maximum tag-limit-hold tag-noise tag-periodogram tag-signal-processing tag-vibration"

What is Auto Spectral Density?

fa fa-file-text-o

The Auto Spectral Density or Auto RMS spectrum analyses uses Fourier Transforms to process optionally overlapped sections of the input data. The result of each Fourier analysed section is called a periodogram. We then process all the resulting periodograms to produce a spectral result. Continue reading What is Auto Spectral Density?

Dr Mike DoneganAdd a Comment3397class="post-3397 post type-post status-publish format-standard hentry category-dats category-signal-processing category-tutorial tag-alias tag-anti-alias tag-anti-aliasing tag-iso2631 tag-iso8041 tag-measurement tag-sample-rate tag-vibration tag-whole-body"

What Sample Rate Do I Use To Measure Whole Body Vibration?

fa fa-file-text-o

What sample rate should I use if I am measuring whole body vibration?

Strict ISO8041 compliance imposes a minimum sample rate of 900 samples per second. This ensures the amplitude and phase characteristics of the applied weightings meet the required criteria. To take account of the anti alias hardware filter we would recommend 1200 samples/second. If non-strict compliance is used the minimum sample rate is 300 samples/second.

ISO2631-1 recommends a minimum data duration of 227 seconds. However, for greater reliability, 600 seconds is now considered essential. That is, a 600 second or longer signal will be more representative and will provide better quality results.

Dr Mike DoneganAdd a Comment2763class="post-2763 post type-post status-publish format-standard hentry category-dats category-tutorial tag-accelerometer tag-accelerometers tag-dats tag-example-worksheet tag-resultant tag-time-histories tag-time-history tag-triaxial tag-waterfall tag-waterfalls"

How Do I Get An XYZ Resultant Waterfall

fa fa-file-text-o

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 An XYZ Resultant Waterfall

Dr Mike DoneganAdd a Comment2819class="post-2819 post type-post status-publish format-standard hentry category-dats category-tutorial tag-axes tag-axis tag-curve tag-curves tag-dats tag-scales"

How do I plot two curves with two different axes

fa fa-file-text-o

A user recently asked…

I was hoping you can give me some way that I can create a plot with two different vertical (Y axis) scaling. I want to plot Principle stress and applied load vs. time on the same plot.

I want to show the principle stress increments on the left side of the graph and the load scale on the right side of the graph. I can do this with some other programs but cannot find a way to do it in DATS for Windows.

Is this POSSIBLE?

Continue reading How do I plot two curves with two different axes

Dr Mike DoneganAdd a Comment2817class="post-2817 post type-post status-publish format-standard hentry category-dats category-tutorial tag-articulation tag-articulation-index tag-harshness tag-metrics tag-noise-vibration tag-sound-quality tag-sound-quality-metrics tag-waterfall"

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

fa fa-file-text-o

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

Dr Mike DoneganAdd a Comment Proudly powered byWordPressDesign byBlogoLife