Creating Order Plots Using 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.
Figure 1: Time series loaded into DATS software
Figure 2 shows the tachometer pulse train in more detail.
Figure 2: Detail of tachometer pulse train
Next the DATS Rotating Machinery option is used to convert the time series of vibration and tachometer pulses into a waterfall and a speed signal. This process is shown in figures 3, 4 and 5.
Figure 3: Processing steps required to create the waterfall
Figure 4: A speed curve generated from the tachometer pulses
Figure 5: A waterfall plot with an x axis in frequency (Hz)
The waterfall can be shown as an intensity plot, as shown in Figure 6.
Figure 6: Waterfall as an intensity plot
The intensity plot can be shown in dB as seen in Figure 7.
Figure 7: Intensity plot shown in dB
It is possible to show order lines by changing the Graph Settings (Figure 8). Note the show order lines option is ticked.
Figure 8: Settings showing order lines option ticked
Figure 9 shows the intensity plot scaled in dB with order lines shown.
Figure 9: Intensity plot in dB with order lines shown
Next we use the Graph Settings again and select the option ‘Show Orders in the X Direction’ as shown in Figure 10.
Figure 10: Settings showing “show orders in x direction” option ticked
The graph in Figure 11 will be shown. This graph displays the waterfall as an intensity plot with the X axis in the order domain.
Figure 9: Intensity plot in dB with order lines shown and plotted against order
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James Wren was Sales & Marketing Manager for Prosig Ltd until 2019. James graduated from Portsmouth University in 2001, with a Masters degree in Electronic Engineering. He is a Chartered Engineer and a registered Eur Ing. He has been involved with motorsport from a very early age with a special interest in data acquisition. James is a founder member of the Dalmeny Racing team.
March 3, 2015 March 3, 2015
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