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Creating Order Plots Using The DATS Rotating Machinery Software

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In this tutorial we will be creating order plots using waterfall and intensity displays using use the DATS.toolbox and Rotating Machinery Analysis option.

To begin, a noise, vibration or other signal of interest should be captured along with a tachometer signal.

In Figure 1 we have loaded a time series (in this case an acceleration signal) and a time series of a tachometer pulse train into the DATS software.

Continue reading Creating Order Plots Using The DATS Rotating Machinery Software

James WrenAdd a Comment3543class="post-3543 post type-post status-publish format-standard hentry category-dats category-signal-processing category-tutorial tag-block-size tag-blocksize tag-fft tag-fft-block-size tag-frequency-domain tag-frequency-spacing tag-waterfall tag-waterfall-frequency-spacing tag-waterfall-plot"

What is waterfall frequency spacing? And how does the DATS parameter ‘Requested Frequency Spacing’ work?

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Let us try to understand what waterfall frequency spacing is. Waterfall frequency spacing is the gap between spectral lines in an FFT plot.

For example, if you had an analysis frequency of 0Hz to 100Hz and 100 spectral lines, then Frequency Spacing is 1Hz.

So why is there a ‘Requested Frequency Spacing’ and an ‘Actual Frequency Spacing’? Continue reading What is waterfall frequency spacing? And how does the DATS parameter ‘Requested Frequency Spacing’ work?

James WrenAdd a Comment3539class="post-3539 post type-post status-publish format-standard hentry category-signal-processing category-tutorial tag-block-size tag-blocksize tag-fft tag-fft-block-size tag-frequency tag-frequency-domain tag-frequency-resolution tag-order-plot tag-rpm tag-waterfall tag-waterfall-plot tag-waterfall-smearing"

What is “waterfall smearing”?

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When analysing a waterfall or performing order analysis it is important to consider the frequency resolution or the frequency spacing.

There is often a desire to increase the resolution to finer and finer detail. But that is a process of diminishing returns, and actually fraught with danger. And that danger is waterfall smearing. Continue reading What is “waterfall smearing”?

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[Video] Creating speed signals for data with no tacho

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So you’ve got some noise and/or vibration data from a rotating machine, but no speed information. Surely that means you can’t analyse against speed or do any order analysis, right? Well, not quite!

The DATS Rotating Machinery option now comes with a tool to create speed v time data using your noise or vibration signals.

Watch the video to find out how…

 

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