National-instruments Order Analysis Toolset Manuel d'utilisateur télécharger pdf (Page 50)

Chapter 5 Calculating Rotational Speed

LabVIEW Order Analysis Toolset User Manual 5-4 ni.com

Figure 5-2 shows an example of the rotational speed calculated from the

tachometer pulses.

Figure 5-2. Cumulative Revolution and Rotational Speed

In Figure 5-2, the dotted line represents the results of calculating the

rotational speed with no averaging. The solid line in Figure 5-2 represents

the results of calculating the rotational speed averaged by five. As

Figure 5-2 shows, the averaged rotational speed is smoother than the

non-averaged rotational speed.

3059.3

3055.0

3050.0

3045.0

3040.0

19.2 19.3 19.4 19.5 19.6

Rotational Speed (RPM)

Speed (No Average)

Speed (Averaged by 5)

Time (s)

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 62 63

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National-instruments Order Analysis Toolset Manuel d'utilisateur Page 50