(08 11 03)Basic Vibration
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Transcript of (08 11 03)Basic Vibration
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PT. Indocement Tarjun Plant November 2008 Prepared by KPS
PS
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1. General Informatio
Vibration
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Vibration(Oscillation)
Vibration!!! (From Dictionary)
The oscillations may be periodicsuch
as the motion of a pendulum or random
such as the movement of a tire on agravel road.
http://en.wikipedia.org/wiki/Periodic_functionhttp://en.wikipedia.org/wiki/Randomhttp://en.wikipedia.org/wiki/Randomhttp://en.wikipedia.org/wiki/Periodic_function -
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Where we can
find vibration
?
Clock HP nyt!"n# el$e%
Guitar
iano
arth
"ua#e
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2. Wanna see
vibration ?
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America Washington state
Year : 1940
Name : Takoma bridge
Wind : 17 ~ 18 m/s
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3. Why we
shold
!hec"
Vibration ?
#or what ?
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What "inds of troble
occr in or $lant?
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1. ressre vessel %&an"'
$ea#
rosion
%%%
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2. Valve
$ea#
rosion
&tem bro#en
assing
%%%
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3. (otatin) *+i$ment
% m$, #an-'
$ea#
rosion
&haft bro#en
Vibration
'oupling
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(otatin) *+i$ment &roble
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(otatin) *+i$ment &roble
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If yo "now vibration ?
Cond"t"on mon"tor"n# &ac!"ne d"a#no$"$
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Why vibration?
Belt
vibrationsUnbalance
Mis-alignment
Lub. OilBlade
defects
Stator
defect
Component
resonance
Rotor-
defectGear defect
Bearing
defect
&ound
Oil nalysis
Vibration
Temp
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. /et0s "now
Vibration
1asic
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nde*.
+. Vibration definition
,. Vibration arameters
- mplitude
- Fre"uency
- hase
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1. Vibration definition
The system response(ovement)
correspond to nternal or
e*ternal force.
/ut if there0s no movement1
t0s not vibration
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1. Vibration definition
Vibration means
the state of ob2ect an
that moves repetitively
bac#3for4ard1
right3 left
or up3do4n
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The s4ing of the pendulum
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The s4ing of the pendulum
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The s4ing
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The movement of spring
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The movement of spring
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The movement of spring
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The movement of spring
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1. m$litde1. is$lacement
2. Velocity
3. cceleration
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+. Displacement
icrons ( )
ils+ 5 +3+666mm 5 6.66+mm
+ mil 5 +3+666inch
Dis!acement means the am!it"de
#distance$
bet%een the eaks o& 'ibration
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+. Displacement
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,. Velocity
Distance 5 Velocity 7 Time
mm3sec or in3sec
Distance
Velocity 5 ''''''''''
Time
(e!ocit) means the changing rate
o& Dis!acement #D$ %ith time
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,. Velocity
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8. cceleration
mm3sec, or in3sec,
9g: 5 ; cm3sec,
5 8
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8. cceleration
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X(t)= Xpeaksin wt
v= wXpeakcos wt
a(t)= -w2Xpeaksin wt
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ea#-to-ea# * + , -eak
ea# * 1.414 ,
A& * 0.707 , eak
verage * 0.9
* 0.237 , -eak
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Vibration Bnit
Displacement
or mil ea# to ea#
Velocitymm3s or nch3sec ea#mm3s or nch3sec rms
cceleartionmm3sec, or in3sec, ea#9g: s pea#
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Fre"uency (C)
re5"enc) means the times o&
reetiti'e motion that a 'ibrating ob6ect
generates in 1 second.
The time &or one c)c!e is
a eriod eressed as T
re5"enc) #$ is eressed as 1/T.
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+
f 5 ---- T
+5 ----
eriod('ycle)
Fre"uency (C)
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Fre"uency (C)
Ehen T 5 6.>sec1Fre"uency is obtained as
F5 +36.>5 ,C
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hase
hase is a fre"uency domain
or Fourier transformdomain concept
http://en.wikipedia.org/wiki/Frequency_domainhttp://en.wikipedia.org/wiki/Fourier_transformhttp://en.wikipedia.org/wiki/Fourier_transformhttp://en.wikipedia.org/wiki/Frequency_domain -
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&han" 4o