praktikum getaran mekanis
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PRAKTIKUM MATA KULIAH GETARAN MEKANIS
MESIN BALANCING MULTIPLANE D E C E M B E R 7 T H , 2 0 1 3
M E C H A N I C A L S Y S T E M D E S I G N A N D B I O M E C H A N I C A L L A B O R A T O R Y
D Y N A M I C S A N D V I B R A T I O N D I V I S I O N
Ekania WidyasariAhmad Syihan
Fachrina
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BALANCING
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UNBALANCE
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Static unbalance
Couple unbalance
Quasistatic unbalance
Dynamic unbalance
Jenis-jenis unbalance
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PEMBACAAN AMPLITUDO GETARAN
mm/s2AKSELERASI
mm/sVELOCITY
mmDISPLACEMENT
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Istilah pengukuran amplitudo
Nilai peak to peak adalah dua kalinya peak. Nilai dari rms adalah 0,707x peak.
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ISO 1940
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NI cDAQ 9174 NI 9234
Balancing Machine
Base
Cradle
MotorStroboskop
Tra
nsd
use
r
Kotak KontrolRotor
SKEMATIK
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Skematik
cDAQ 9174
Komputer unit
NI 9234
tegangan
Mesin Balancing
transduser
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Display LabView untuk Balancing(front panel view)
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Teknik balancing
• Beda sudut fase dari sudut referensiposisi
• Besarnya amplitudo yang terbaca dikonversikan ke mxrbesarnya
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0
396
0
3
9
6
Stroboskop
off
Stroboskop
on
Heavy spot High spot
High spot adalah titik dimana harus diletakkan massa counter balanceHeavy spot adalah titik dimana massa unbalance berada
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Pembacaan amplitudo
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Grafik unbalance 200 400 600 800 1000 1200 1400 1600 1800 2000 2200
2
4
6
8
10
12
14
16
18
Amplitudo
Linear Fit of Amplitudo
Am
plit
ud
o (
mm
/s)
Unbalance (g.mm)
Equation y = a + b*x
Adj. R-Square 0,99286
Value
AmplitudoIntercept -0,0441
Slope 0,00834
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Contoh penjumlahan vektor untuk penentuan koreksi unbalance (mxr)