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