Digital Signal Processing Reference
In-Depth Information
0.5
0
-0.5
0
2
4
6
8
10
12
14
Time (sec.)
0.02
Meshing frequency
0.01
0
0
1000
2000
3000
4000
5000
6000
7000
Frequency (Hz)
0.02
Sideband frequency fm-fi
Meshing frequency
0.01
0
250
260
270
280
290
300
310
320
330
340
350
Zoomed Frequency (Hz)
FIGURE 1.12
Vibration signal and spectrum from the gearbox in good condition.
(Data provided by SpectaQuest, Inc.)
2
0
-2
0
2
4
6
8
10
12
14
Time (sec.)
0.04
Meshing frequency
0.02
0
0
1000
2000
3000
4000
5000
6000
7000
Frequency (Hz)
Meshing frequency
Sidebands
0.02
Sidebands
0.01
0
250
260
270
280
290
300
310
320
330
340
350
Zoomed Frequency (Hz)
FIGURE 1.13
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