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

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

OVERALL= .1109 V-DG RMS = .0927 LOAD = 100.0 RPM = 1793. (29.88 Hz)

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

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

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.

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

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

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

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

>FAG NU220 K=FTF -IB: 12.81

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…

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

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

>FAG NU220 K=FTF -IB: 12.81

K K K K K K K K K K K

Autocorrelated Peakvue waveform with FTF faults overlaid…

Velocity spectrum and acceleration waveform for the

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

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

P-P

Wav

e in

G-s

WARNING

Route Waveform 09-Jan-08 09:17:18 RMS = 1.64 PK(+/-) = 9.27/10.18 CRESTF= 6.22

0 4 8 12 16 20 24

-12-8-4048

Revolution Number

Acc

in G

-s

Route Spectrum 09-Jan-08 09:17:18 OVERALL= .0926 V-DG PK = .0925 LOAD = 100.0 RPM = 1793. (29.88 Hz)

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

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

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

OVERALL= .0926 V-DG RMS = .2908 LOAD = 100.0 RPM = 1793. (29.88 Hz)

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…

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

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

OVERALL= .0926 V-DG RMS = .1360 LOAD = 100.0 RPM = 1793. (29.88 Hz)

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…

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

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

>FAG NU220 K=FTF -IB: 12.81

K K K K K K K K K

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

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

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?

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

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

Time: Ampl:

156.64 .519

>FAG NU220 K=FTF -IB: 12.81

K K K K K

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

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

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

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

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

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

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

>FAG NU220 M=BPFO -IB: 204.9

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

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

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

>FAG NU220 K=FTF -IB: 768.5

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

FTF faults overlaid on the Peakvue spectrum…

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

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

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….

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

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

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

>FAG NU220 K=FTF -IB: 12.81

K K K K K K K K K K K

FTF faults overlaid on the autocorrelated TWF…

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

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

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

>FAG NU220 M=BPFO -IB: 204.9

MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM

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

Velocity spectrum and acceleration waveform for the

inboard motor position in the axial direction.

Route Waveform 09-Jan-08 09:17:34 RMS = 2.48 PK(+/-) = 13.49/13.38 CRESTF= 5.43

0 4 8 12 16 20 24

-15-10-505

10

Revolution Number

Acc

in G

-s

Route Spectrum 09-Jan-08 09:17:34 OVERALL= .0802 V-DG PK = .0800 LOAD = 100.0 RPM = 1793. (29.88 Hz)

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

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

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

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

OVERALL= .0802 V-DG RMS = .1100 LOAD = 100.0 RPM = 1793. (29.88 Hz)

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…..

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

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…

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

Route ACorr(Wf) 09-Jan-08 09:17:34

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….

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

Route ACorr(Wf) 09-Jan-08 09:17:34

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

>FAG NU220 K=FTF -IB: 12.81

K K

FTF overlaid on the autocorrelated waveform…

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

Route ACorr(Wf) 09-Jan-08 09:17:34

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

>FAG NU220 M=BPFO -IB: 204.9

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….