Synchronous Motor 900 HP300 RPM
Wood ChipperSKF 23156C double row spherical roller bearings
Chipper Drawing
Normal Processing
Low overall spectrum No bearing fault frequencies Low peak-peak waveform
– Limited by sampling rate
WAVEFORM DISPLAY 04-APR-97 10:02:45 RMS = .0516 PK(+) = .3759 PK(-) = .2328 CRESTF= 7.28
0 100 200 300 400 500 600 700 800
-1.2-0.9-0.6-0.3
00.30.60.91.21.5
Time in mSecs
Acc
eler
atio
n in
G-s
2WYD - #2 CHIPPER CH-1132-01-02 -CIA CHIPPER INBOARD AXIAL
ROUTE SPECTRUM 04-APR-97 10:02:45 OVRALL= .0455 V-DG PK = .0455 LOAD = 100.0 RPM = 301. RPS = 5.01
0 100 200 300 400 500
0
0.01
0.02
0.03
0.04
0.05
0.060.07
Frequency in Hz
PK
Vel
oci
ty in
In/S
ec
Freq: Ordr: Spec:
5.012 1.001 .00694
Normal Spectrum/Waveform
PeakVue Processing
Not limited by Sample Rate (Fmax * 2.56) Harmonics of Cage Frequency
– Not a Cage Defect Ball Spin Frequency
– One defective roller repeats at rate equal to cage frequency
– PeakVue detects this repetition
2WYD - #2 CHIPPER CH-1
132-01-02 -CIA CHIPPER INBOARD AXIAL
Analyze Spectrum
04-APR-97 10:04
(PkVue-HP 2000 Hz)
RMS = 1.08
LOAD = 100.0
RPM = 300.
RPS = 5.01
0 5 10 15 20 25 30 35 40 45 50 55
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
Frequency in Hz
RM
S A
cc
ele
rati
on
in G
-s
Freq:
Ordr:
Spec:
2.219
.443
.311
>SKF 23156C
B=FTF : 2.21
B B B B B B B B
Cage Frequency Harmonics
2WYD - #2 CHIPPER CH-1
132-01-02 -CIA CHIPPER INBOARD AXIAL
Analyze Spectrum
04-APR-97 10:04
(PkVue-HP 2000 Hz)
RMS = 1.08
LOAD = 100.0
RPM = 300.
RPS = 5.01
0 5 10 15 20 25 30 35 40 45 50 55
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
Frequency in Hz
RM
S A
cc
ele
rati
on
in G
-s
Freq:
Ordr:
Spec:
13.41
2.678
.01202
>SKF 22340C
G=BSF : 13.42
G G G
3rd Harmonic of BSF
PeakVue Waveform
Clear impacts from roller Modulated by repetition (cage) Repetition is displayed in spectrum
Waveform-Ball Spin Frequencies
2WYD - #2 CHIPPER CH-1132-01-02 -CIA CHIPPER INBOARD AXIAL
Waveform Display 04-APR-97 10:04:17
RMS = 1.55 LOAD = 100.0 RPM = 300. RPS = 5.01
PK(+) = 17.26 PK(-) = .8885 CRESTF= 11.16
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
-2
0
2
4
6
8
10
12
14
16
18
20
Time in Seconds
Acc
eler
atio
n i
n G
-s
Time: Ampl:
1.094 17.33
Groups of BSF impacts
Waveform Zoom-BSF Impacts
2WYD - #2 CHIPPER CH-1132-01-02 -CIA CHIPPER INBOARD AXIAL
Waveform Display 04-APR-97 10:04:17
RMS = 1.54 LOAD = 100.0 RPM = 300. RPS = 5.01
PK(+) = 17.26 PK(-) = .8885 CRESTF= 11.16
1400 1600 1800 2000 2200 2400 2600
-2
0
2
4
6
8
10
12
14
Time in mSecs
Acc
eler
atio
n in
G-s
Time: Ampl: Dtim; Freq:
1964.8 11.33 .00000 .00000
>SKF 22340C G=BSF : 13.42
G G G G G G G G G G G G G
Waveform-Cage Modulation
2WYD - #2 CHIPPER CH-1132-01-02 -CIA CHIPPER INBOARD AXIAL
Waveform Display 04-APR-97 10:04:17
RMS = 1.55 LOAD = 100.0 RPM = 300. RPS = 5.01
PK(+) = 17.26 PK(-) = .8885 CRESTF= 11.16
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
-2
0
2
4
6
8
10
12
14
16
18
20
Time in Seconds
Acc
eler
atio
n i
n G
-s
Time: Ampl:
1.094 17.33
Repetition rate of BSF impacts is cage frequency.
Roller