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
B&KSchenck
1 - Offline Monitoring
2 - Online Monitoring
42
4-1B&KSchenck
1 - Trend Monitoring
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
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
20
4-4
AC
1 - Sensitivity
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
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
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