webinar maintenance series
TRANSCRIPT
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WEBINAR MAINTENANCE SERIES
ADVANCED VIBRATION
ANALYSIS
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Outline
Sesi Pertama
Pengantar vibrasi
Fault condition yang dapat diidentifikasi menggunakan analisa vibrasi
Contoh kasus
Summary
Sesi Kedua
Operating deflection shape
Contoh Kasus
Summary
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Sesi
Pertama
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Pengantar vibrasi
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Pengantar vibrasi
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RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Karakteristik Vibrasi
Amplitudo
Frekuensi
Fasa
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RELIABILITY, AVAILBILITY, MAINTAINABILITY
Seberapa besar
Seberapa sering
Kapan
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Karakteristik Vibrasi
Amplitudo
Besar nilai vibrasi yang berbanding lurus dengan kuatnya sinyal (millivolts ataumilliamps) dalam satuan engineering (in/s, mm/s, mils)
9/2/2021Basic Theory
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RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Karakteristik Vibrasi
Amplitudo (bersambung)
Ada banyak cara dalam mengukur amplitudo dari vibrasi.Paling umum adalah: peak to peak, zero to peak, root mean square (RMS), dan average.
9/2/2021Basic Theory
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RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Karakteristik Vibrasi
Amplitudo (bersambung)
Ada banyak cara dalam mengukur amplitudo dari vibrasi.Paling umum adalah: peak to peak, zero to peak, root mean square (RMS), dan average.
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RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Karakteristik Vibrasi
Amplitudo (bersambung)
Ada banyak cara dalam mengukur amplitudo dari vibrasi.Paling umum adalah: peak to peak, zero to peak, root mean square (RMS), dan average.
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RELIABILITY, AVAILBILITY, MAINTAINABILITY
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KARAKTERISTIK VIBRASI
Frekuensi
Jumlah siklus vibrasi yang terjadi selang waktu tertentu
Kebalikan dari Perioda (T)
Diukur dalam satuan Hz /CPM
CPM berkorelasi langsung dengan RPM
12
Frequency = 1
T= Cycles
Second
1
Period=
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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KARAKTERISTIK VIBRASI
Frekuensi (bersambung)
Dapat dinyatakan dalam:
1. CPM – Cycles Per Minute
1CPM = 1RPM
2. Hz – Cycles Per Second
CPM / 60
3. Orders – kelipatan dari kecepatan putar
Anggap suatu motor memiliki kecepatan putar 1485RPM, sehingga dapat dinyatakan sbb:
1485 CPM (1rpm = 1cpm)
24.75 Hz (1485/60) (menit ke detik)
1 Orders (1 x putran shaft)
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RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Karakteristik vibrasi
Fasa
Ukuran yang menyatakan beda
waktu antara dua kejadian (vibrasi)
yang memiliki frekuensi yang sama.
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RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Karakteristik vibrasi
Fasa (bersambung)
Fasa Absolut
Fasa absolut adalah hubungan antara puncak sinyal vibrasi dengan
referensi tetap.
Fasa Relatif
Fasa relative hubungan antara dua puncak sinyal vibrasi.
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RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Karakteristik vibrasi
Fasa (bersambung)
Fasa Absolut
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RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Karakteristik vibrasi
Fasa (bersambung)
Fasa Absolut
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RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Karakteristik vibrasi
Fasa (bersambung)
Fasa Absolut
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RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Karakteristik vibrasi
Fasa (bersambung)
Fasa Relatif
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RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Karakteristik vibrasi
Fasa (bersambung)
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How Much Vibration is Too Much ?
1. Use Absolute Vibration Levels
- Given by machine makers
- Published Vibration Severity Standards
eg. ISO 10816
2. Use Relative Vibration Levels
Vibration Fundamentals21
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11 0.44
7.1 0.28
4,5 0.18
3,5 0.11
2,8 0.07
2,3 0.04
1.4 0.03
0,71 0.02
mm/s rms inch/s rms
rigid flexible rigid flexible rigid flexible rigid flexible Foundation
pumps > 15 kW medium sized machines large machines
radial, axial, mixed flow 15 kW < P 300 kW 300 kW < P < 50 MW Machine Type
integrated driver external driver motors motors
160 mm H < 315 mm 315 mm H
Group 4 Group 3 Group 2 Group 1 Group
A newly commissioned
B unrestricted long-term operation
C restricted long-term operation
D vibration causes damage
ISO 10816-322
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140 5.51
113 4.45
90 3.54
71 2.80
56 2.20
45 1.77
36 1.42
28 1.10
22 0.87
18 0.71
11 0.43
µm rms mil rms
rigid flexible rigid flexible rigid flexible rigid flexible Foundation
pumps > 15 kW medium sized machines large machines
radial, axial, mixed flow 15 kW < P 300 kW 300 kW < P < 50 MW Machine Type
integrated driver external driver motors motors
160 mm H < 315 mm 315 mm H
Group 4 Group 3 Group 2 Group 1 Group
A newly commissioned
B unrestricted long-term operation
C restricted long-term operation
ISO 10816-323
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Vibration Fundamental
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Vibration Fundamental
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Timewaveform
Spectrum
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Fault condition vibrasi
Unbalance
Misalignment
Looseness
Resonance
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Fault condition Unbalance
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Fault condition Unbalance
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Fault condition
Looseness
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Fault condition
Misalignment
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Fault condition
Misalignment
Softfoot
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Fault condition
Misalignment
Thermal growth
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Fault condition
Resonance
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Bump test Pengujian dengan melakukan bump (pukulan) pada struktur.
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Bump test
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Spektrum hasil bump test
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Bump test
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Contoh Kasus
Pompa A
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Contoh Kasus
Pompa A
Finding
• High 1xrpm vibration on motor horizontal direction
Analisis
• Phase data shows indication softfoot condition
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Contoh Kasus
sd
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Contoh Kasus
Spektrum
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Contoh Kasus
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Contoh Kasus
Data setelah koreksi softfoot
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Kesimpulan
Setiap vibrasi memiliki karakteristik tersendiri
Beberapa fault condition yang umumnya terjadi dan memiliki symptom
hampir sama di antaranya: unbalance, misalignment, looseness, dan
resonansi.
Untuk membedakan fault condition tersebut bisa dilakukan analisis fasa.
Jika diperlukan, dilakukan analisis lebih lanjut menggunakan “advanced
analysis” sebagai data pendukung yang memperkuat hasil analisis
sebelumnya
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Sesi kedua
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Operating deflection Shape (ODS)
ODS membantu dalam memvisualisasikan getaran.
Vibrasi bisa berasal dari unbalan, misalign, resonansi, atau lainnya.
Mengetahui bagaimana suatu struktur bergetar pada frekuensi tertentu
Dari informasi ini kita bisa menentukan tindakan yang dilakukan untuk mengurangi
tingkat getaran
Balansing atau align equipment
Mengkakukan atau menambah massa untuk mengganti natural frequency
Mengubah kondisi operasi mesin
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Operating deflection shape
Plan the job
Pengambilan data
Animating the machine
ME’Scope software
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Operating deflection shape Plan the job
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Operating deflection shape Pengambilan data
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Contoh kasus
Pompa B
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Contoh kasus
Pompa B
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Contoh kasus
Pompa B
Findings:
Premature bearing failure
High temperature on pump bearing
High 1xrpm pump vibration
Suspect: misalignment
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Contoh kasus
Pompa B
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Contoh kasus
Pompa B
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Contoh kasus
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Pompa B
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Contoh kasus
Pembuatan 3D Model
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Contoh kasus
Pembuatan 3D Model
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Contoh kasus
Pembuatan 3D Model
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Contoh kasus Menentukan titik
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Contoh kasus Menentukan titik
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Contoh kasus Menentukan titik
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Contoh kasus
Animasi
Visualisasi vibrasi yang terjadi pada motor dan pompa
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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Contoh kasus
Data fasa
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Summary
Motor dan pompa terkonfirmasi mengalami misalignment
Kondisi misalignment ini terlihat dari gerakan motor dan pompa dari hasil
Operating Deflection Shape
Adanya termal growth yang menyebabkan kondisi misalignment
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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THANK YOU
@adikariwisesa PT Adikari Wisesa
Indonesiaextreme-maintenance.com