Digital Signal Processing Reference
In-Depth Information
(a)
Gearbox
(b)
Pinion and gear
missing tooth
(c)
Damaged pinion
FIGURE 4.27
Vibration signature analysis of a gearbox.
(Courtesy of SpectaQuest, Inc.)
along with the vibration signals and spectra for three different damage severity levels (there are five
levels classified by SpectraQuest, Inc; the spectrums shown are for severity level 1 [lightly chipped];
severity level 4 [heavily chipped]; and severity level 5 [missing tooth]). As we can see, the baseline
spectrum contains the meshing frequency component of 300 Hz and a sideband frequency compo-
nent of 283.33 Hz (300-16.67). We can observe that the sidebands (
f
m
f
i
,
f
m
2
f
i
.
) become
more dominant when the severity level increases. Hence, the spectral information is very useful for
monitoring the health condition of the gearbox.
Search WWH ::
Custom Search