FTF bearing defects with side banding occurring @ BPFO in a motor bearing…

FTF bearing defects with side banding occurring @ BPFO in a

motor bearing….

Velocity spectrum and acceleration waveform for the

outboard motor position.

Route Waveform 09-Jan-08 09:16:59 RMS = 1.14 PK(+/-) = 4.71/4.68 CRESTF= 4.13

0 4 8 12 16 20 24

-6

-3

0

36

Revolution Number

Acc

in G

-s

Route Spectrum 09-Jan-08 09:16:59 OVERALL= .1109 V-DG PK = .1105 LOAD = 100.0 RPM = 1793. (29.88 Hz)

0 20 40 60 80 100 120 140

0 0.020.040.060.080.100.12

Frequency in kCPM

PK V

el in

In/S

ec001 - MP-32 CENTRIFUGE

MP-32 -M1H Motor Outboard HorizontalTrend Display PK-PK WAVEFORM

0 200 400 600 800 1000

02468

10

Days: 16-May-05 To 09-Jan-08

P-P

Wav

e in

G-s

WARNING

Date: Time: Ampl:

09-Jan-08 09:16:59 9.381

001 - MP-32 CENTRIFUGEMP-32 -M1H Motor Outboard Horizontal

Route Spectrum 09-Jan-08 09:16:59

OVERALL= .1109 V-DG RMS = .1436 LOAD = 100.0 RPM = 1793. (29.88 Hz)

0 20 40 60 80 100 120 140

0

0.03

0.06

0.09

0.12

Frequency in kCPM

RMS

Acce

lera

tion

in G

-s

Freq: Ordr: Spec:

1.753 .978 .00383

>FAG NU220 M=BPFO -IB: 12.30

M M M M M M M M M M

This the motor outboard bearing shown integrated to acceleration….notice the BPFO aligned with the fault frequencies. Also, notice the side banding going on….

001 - MP-32 CENTRIFUGEMP-32 -M1H Motor Outboard Horizontal



50000 60000 70000 80000 90000 100000

0

0.02

0.04

0.06

0.08

0.10

Frequency in CPM

RMS

Acce

lera

tion

in G

-s

Freq: Ordr: Spec: Dfrq:

72773. 40.59 .03919 764.17

>FAG NU220 M=BPFO -IB: 12.30K

M M M

This is a zoom of one of the harmonics with side band cursors spaced @ 764 cpm….this is FTF for the bearing in question.

Peakvue spectrum and waveform for the outboard motor position.

001 - MP-32 CENTRIFUGEMP-32 -M1P Motor Outboard Horz Peakvue

Trend Display PK-PK WAVEFORM

0 200 400 600 800 1000

012345


P-P

Wav

e in

G-s

WARNING

Route Waveform 09-Jan-08 09:16:59 (PkVue-HP 1000 Hz) RMS = 1.65 PK(+) = 5.06 CRESTF= 3.06 DCoff = .2409

0 10 20 30 40 50

012345

Revolution Number

Acc

in G

-s

Route Spectrum 09-Jan-08 09:16:59 (PkVue-HP 1000 Hz) OVERALL= .7246 A-DG RMS = .7567 LOAD = 100.0 RPM = 1793. (29.88 Hz)

0 20000 40000 60000

0 0.10.20.30.4

Frequency in CPM

RMS

Acc

in G

-s

Freq: Ordr: Spec:

19125. 10.67 .00989

This the Peakvue spectrum zoomed to show FTF peaks for the bearing.


Route Spectrum 09-Jan-08 09:16:59 (PkVue-HP 1000 Hz)

OVERALL= .7246 A-DG RMS = .6580 LOAD = 100.0 RPM = 1793. (29.88 Hz)

0 8000 16000 24000

0

0.1

0.2

0.3

0.4

0.5

Frequency in CPM

RMS

Acce

lera

tion

in G

-s

Freq: Ordr: Spec:

766.98 .428 .438

>FAG NU220 K=FTF -IB: 768.5

K K K K K K K K K K K K K K K


Route Waveform 09-Jan-08 09:16:59 (PkVue-HP 1000 Hz)

RMS = 1.65 LOAD = 100.0 RPM = 1793. (29.88 Hz)

PK(+) = 5.06 CRESTF= 3.06 DCoff = .2409

0 10 20 30 40 50

0

3

6

9

12

Revolution Number

Acce

lera

tion

in G

-s

Rev : Ampl:

18.22 5.006


K K K K K K K K K K K K K K K K K K K K

Peakvue waveform with FTF faults frequencies overlaid…


Route ACorr(Wf) 09-Jan-08 09:16:59 (PkVue-HP 1000 Hz)

RMS = .2504 LOAD = 100.0 RPM = 1793. (29.88 Hz)

PK(+) = .6990 PK(-) = .3958 CRESTF= 2.79

0 100 200 300 400 500 600 700 800

-1.0

-0.5

0

0.5

1.0

Time in mSecs

Corre

latio

n Fa

ctor

Time: Ampl:

391.80 .489


K K K K K K K K K K K

Autocorrelated Peakvue waveform with FTF faults overlaid…


inboard motor position.

001 - MP-32 CENTRIFUGEMP-32 -M2H Motor Inboard Horizontal

Trend Display PK-PK WAVEFORM

0 200 400 600 800 1000

0

6

12

1824


P-P

Wav

e in

G-s

WARNING


0 4 8 12 16 20 24

-12-8-4048

Revolution Number

Acc

in G

-s


0 20 40 60 80 100 120 140

0 0.020.040.060.08

Frequency in kCPM

PK V

el in

In/S

ec

Freq: Ordr: Spec:

19.13 10.67 .00026




0 20 40 60 80 100 120 140

0

0.04

0.08

0.12

0.16

0.20

0.24

Frequency in kCPM

RMS

Acce

lera

tion

in G

-s >FAG NU220 M=BPFO -IB: 12.30

M M M M M M M M M M

This the inboard motor bearing with BPFO faults overlaid….again notice the side banding…




48000 56000 64000 72000 80000 88000 96000

0

0.02

0.04

0.06

0.08

0.10

0.12

0.14

Frequency in CPM

RMS

Acce

lera

tion

in G

-s

Freq: Ordr: Spec: Dfrq:

62811. 35.03 .02429 767.02

>FAG NU220 M=BPFO -IB: 12.30K

M M M

Here's the side band spacing @ FTF again…


Route Waveform 09-Jan-08 09:17:18

RMS = 1.64 LOAD = 100.0 RPM = 1793. (29.88 Hz)

PK(+) = 9.27 PK(-) = 10.18 CRESTF= 6.22

0 4 8 12 16 20 24

-12

-8

-4

0

4

8

12

Revolution Number

Acce

lera

tion

in G

-s

Rev : Ampl:

8.752 8.478


K K K K K K K K K

TWF from the inboard motor bearing with FTF's overlaid…


Route ACorr(Wf) 09-Jan-08 09:17:18

RMS = .0517 LOAD = 100.0 RPM = 1793. (29.88 Hz)

PK(+) = .5686 PK(-) = .4198 CRESTF= 11.01

0 80 160 240 320 400

-1.0

-0.5

0

0.5

1.0

Time in mSecs

Corre

latio

n Fa

ctor

Now, I thought this was cool….this is the acceleration TWF from the inboard motor bearing after being autocorrelated….notice any periodic events?



RMS = .0517 LOAD = 100.0 RPM = 1793. (29.88 Hz)

PK(+) = .5686 PK(-) = .4198 CRESTF= 11.01

0 80 160 240 320 400

-1.0

-0.5

0

0.5

1.0

Time in mSecs

Corre

latio

n Fa

ctor

Time: Ampl:

156.64 .519


K K K K K

You guessed it…..FTF once again…there is also side banding going on…



RMS = .0517 LOAD = 100.0 RPM = 1793. (29.88 Hz)

PK(+) = .5686 PK(-) = .4198 CRESTF= 11.01

120 130 140 150 160 170 180 190 200

-1.0

-0.5

0

0.5

1.0

Time in mSecs

Corre

latio

n Fa

ctor

Zoom of autocorrelated TWF



RMS = .0517 LOAD = 100.0 RPM = 1793. (29.88 Hz)

PK(+) = .5686 PK(-) = .4198 CRESTF= 11.01

120 130 140 150 160 170 180 190 200

-1.0

-0.5

0

0.5

1.0

Time in mSecs

Corre

latio

n Fa

ctor

Time: Ampl:

156.64 .519


M M M M M M M M M M M M M M M

Here's the sideband spacing…..it's BPFO…..

Peakvue spectrum and waveform for the inboard motor position.

Route Waveform 09-Jan-08 09:17:18 (PkVue-HP 1000 Hz) RMS = 2.68 PK(+) = 9.29 CRESTF= 3.46 DCoff = .5618

0 10 20 30 40 50

02468

Revolution Number

Acc

in G

-s

Route Spectrum 09-Jan-08 09:17:18 (PkVue-HP 1000 Hz) OVERALL= 1.29 A-DG RMS = 1.30 LOAD = 100.0 RPM = 1793. (29.88 Hz)

0 20000 40000 60000

0 0.20.40.60.8

Frequency in CPM

RMS

Acc

in G

-s001 - MP-32 CENTRIFUGE

MP-32 -M2P Motor Inboard Horz PeakvueTrend Display 3xTS

0 200 400 600 800 1000

0 0.050.100.150.200.250.30


RMS

Acc

in G

-s

WARNING

Date: Time: Ampl:

09-Jan-08 09:17:20 .310

001 - MP-32 CENTRIFUGEMP-32 -M2P Motor Inboard Horz Peakvue

Route Spectrum 09-Jan-08 09:17:18 (PkVue-HP 1000 Hz)

OVERALL= 1.29 A-DG RMS = 1.19 LOAD = 100.0 RPM = 1793. (29.88 Hz)

0 8000 16000 24000

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

Frequency in CPM

RMS

Acce

lera

tion

in G

-s

Freq: Ordr: Spec:

766.20 .427 .705


K K K K K K K K K K K K K K K

FTF faults overlaid on the Peakvue spectrum…



RMS = .2026 LOAD = 100.0 RPM = 1793. (29.88 Hz)

PK(+) = .6717 PK(-) = .3484 CRESTF= 3.32

0 100 200 300 400 500 600 700 800

-1.0

-0.5

0

0.5

1.0

Time in mSecs

Corre

latio

n Fa

ctor

Autocorrelated Peakvue TWF….



RMS = .2026 LOAD = 100.0 RPM = 1793. (29.88 Hz)

PK(+) = .6717 PK(-) = .3484 CRESTF= 3.32

0 100 200 300 400 500 600 700 800

-1.0

-0.5

0

0.5

1.0

Time in mSecs

Corre

latio

n Fa

ctor

Time: Ampl:

313.28 .651


K K K K K K K K K K K

FTF faults overlaid on the autocorrelated TWF…



RMS = .2026 LOAD = 100.0 RPM = 1793. (29.88 Hz)

PK(+) = .6717 PK(-) = .3484 CRESTF= 3.32

240 270 300 330 360 390 420 450

-1.0

-0.5

0

0.5

1.0

Time in mSecs

Corre

latio

n Fa

ctor

Time: Ampl:

313.28 .651


MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM

Here's a zoom of the autocorrelated Peakvue TWF with the side banding overlaid with BPFO faults…


inboard motor position in the axial direction.


0 4 8 12 16 20 24

-15-10-505

10

Revolution Number

Acc

in G

-s


0 20 40 60 80 100 120 140

0 0.010.020.030.040.05

Frequency in kCPM

PK V

el in

In/S

ec001 - MP-32 CENTRIFUGE

MP-32 -M2A Motor Inboard AxialTrend Display PK-PK WAVEFORM

0 200 400 600 800 1000

05

10152025


P-P

Wav

e in

G-s

WARNING

Date: Time: Ampl:

16-May-05 08:34:29 1.643

001 - MP-32 CENTRIFUGEMP-32 -M2A Motor Inboard Axial



0 20 40 60 80 100 120 140

0

0.01

0.02

0.03

0.04

0.05

Frequency in kCPM

RMS

Acce

lera

tion

in G

-s

Freq: Ordr: Spec:

33.95 18.93 .00106

Velocity spectrum integrated to acceleration…..


Route Waveform 09-Jan-08 09:17:34

RMS = 2.48 LOAD = 100.0 RPM = 1793. (29.88 Hz)

PK(+) = 13.49 PK(-) = 13.38 CRESTF= 5.43

0 4 8 12 16 20 24

-15

-10

-5

0

5

10

15

Revolution Number

Acce

lera

tion

in G

-s

Rev : Ampl:

11.63 .459

Here's the TWF…notice the G swing….kinda high…



RMS = .1256 LOAD = 100.0 RPM = 1793. (29.88 Hz)

PK(+) = .6803 PK(-) = .7154 CRESTF= 5.70

0 80 160 240 320 400

-1.0

-0.5

0

0.5

1.0

Time in mSecs

Corre

latio

n Fa

ctor

Autocorrelated TWF….



RMS = .1256 LOAD = 100.0 RPM = 1793. (29.88 Hz)

PK(+) = .6803 PK(-) = .7154 CRESTF= 5.70

100 150 200 250 300

-1.0

-0.5

0

0.5

1.0

Time in mSecs

Corre

latio

n Fa

ctor

Time: Ampl:

156.73 .176


K K

FTF overlaid on the autocorrelated waveform…



RMS = .1256 LOAD = 100.0 RPM = 1793. (29.88 Hz)

PK(+) = .6803 PK(-) = .7154 CRESTF= 5.70

110 120 130 140 150 160 170 180 190 200

-1.0

-0.5

0

0.5

1.0

Time in mSecs

Corre

latio

n Fa

ctor

Time: Ampl:

156.68 .673


M M M M M M M M M M M M M M M

BPFO overlaid on the FTF peak in the autocorrelated TWF…

The End….

Documents

FTF bearing defects with side banding occurring @ BPFO in a motor bearing…