Fidelity and Casualty

42

1 - Velocity Meter

2 - Curtiss Wright

3 - Noncontact

4 - Eddy Current

5 - Don Bently

6 - Don Wilhelm

42

IRDEntek

Entek IRD

Spectral Dynamics

1 - Bentley Nevada Corporation

2 - Accelerometer

3 - Dr. Larry Mitchell

4 - Dupont

5 - Richard Bruchill

42

TecalamatAVM-1IRD

Palomar

1 - Exxon

2 - Shell

3 - Zonic

4 - Cooley

5 - Tuchey

6 - Fast Fourier Transform (FFT)

42

42

B&KSchenck

1 - Offline Monitoring

2 - Online Monitoring

42

4-1B&KSchenck

1 - Trend Monitoring

03

01

mmμmMil

mm/s

in/s

g

(g =9.81 m/s2)

) ( tωSinxx

) ( tωCosωxv

) (2 tSinxa

04

4-1

ωv /2/a

ωx ωa /

2 xωv.

0.3in/sec

00

4-4

4-00.3ips

02

PP

Spp

P

RMS

T

RMS dtST

S

21

0.707Sp

average

Aaverage

T

average dtST

S

.1

1 - Peak To Peak

2 - Root Mean Square

02

2

p

average

SS

4-2

dB

SLog1020

S

02

4-2

1 - Phase

2 - Tachometer

02

4-2

1 - Bandwidth

02

4-2

dB0

dB140

dB60

dB3dB3

dB10

02

4-2

0.001g0.01g

0.1g

0.5g

1 - Cavitations

2 - Transducer

23

4-2

Bently Nevada

1 - Proximity Probe

21

4-13

DC

4-11

24

4-14

20

4-4

AC

1 - Sensitivity

22

4-10

22

4-12

22

4-12 4-12

22

(mVolt)/(mm/s)(mVolt)/(in/sec)

4-12

1 - Self Generating

22

1 - Piezoelectric

22

4-12

4-12 4-43

23

4-41

mVolt/gpC/g

1 - Preamplifier

21

4-44

4-40

1 - Transverse Sensitivity

24

4-42

20

4-42

4-42

22

4-0

22

4-42

ENDEVCO

22

4-2

100 mV/g 100 mV/g 100 mV/g

0.212000 Hz 0.310000 Hz0.510000 Hz

50 kHz28 kHz35 kHz

-55125 C-2085 C-55125 C

50 g50 g50 g

5000 g5000 g10000 g

1 gram13 gram5 gram

4-42

22

4-42

1 - Sampling Frequency

2 - Aliasing

22

4-03

1 - Untialias Filter

22

1 - Low Pass Filter

2 - High Pass Filter

3 - Band Pass Filter

23

-

uo ffB

21

Bofuf

m

uo

f

ffB

mf

4-04

4-00

24

3dB

FFT

1 - Window Function

20

4-02 4-02

4-02

Hamming

22

4-02

Hamming

4-02

HanningFlattop

22

Trigger

Trigger

22

4-02

1 - Mechanical Impedance

22

AB

B

CD

C

4-23

22

VDI 2056ISO 2372AFNOR E90-300