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WEBINAR MAINTENANCE SERIES
ADVANCED VIBRATION
ANALYSIS
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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
Sesi
Pertama
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Pengantar vibrasi
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Pengantar vibrasi
.
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Karakteristik Vibrasi
Amplitudo
Frekuensi
Fasa
7
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Seberapa besar
Seberapa sering
Kapan
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
8
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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
9
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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.
10
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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.
11
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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
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)
13
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Karakteristik vibrasi
Fasa
Ukuran yang menyatakan beda
waktu antara dua kejadian (vibrasi)
yang memiliki frekuensi yang sama.
14
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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.
15
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Karakteristik vibrasi
Fasa (bersambung)
Fasa Absolut
16
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Karakteristik vibrasi
Fasa (bersambung)
Fasa Absolut
17
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Karakteristik vibrasi
Fasa (bersambung)
Fasa Absolut
18
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Karakteristik vibrasi
Fasa (bersambung)
Fasa Relatif
19
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Karakteristik vibrasi
Fasa (bersambung)
20
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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
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
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
Vibration Fundamental
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Vibration Fundamental
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Timewaveform
Spectrum
Fault condition vibrasi
Unbalance
Misalignment
Looseness
Resonance
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Fault condition Unbalance
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Fault condition Unbalance
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Fault condition
Looseness
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Fault condition
Misalignment
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Fault condition
Misalignment
Softfoot
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Fault condition
Misalignment
Thermal growth
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Fault condition
Resonance
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Bump test Pengujian dengan melakukan bump (pukulan) pada struktur.
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Bump test
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Spektrum hasil bump test
Bump test
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh Kasus
Pompa A
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh Kasus
Pompa A
Finding
• High 1xrpm vibration on motor horizontal direction
Analisis
• Phase data shows indication softfoot condition
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh Kasus
sd
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh Kasus
Spektrum
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh Kasus
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh Kasus
Data setelah koreksi softfoot
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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
Sesi kedua
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Operating deflection shape
Plan the job
Pengambilan data
Animating the machine
ME’Scope software
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Operating deflection shape Plan the job
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Operating deflection shape Pengambilan data
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh kasus
Pompa B
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh kasus
Pompa B
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh kasus
Pompa B
Findings:
Premature bearing failure
High temperature on pump bearing
High 1xrpm pump vibration
Suspect: misalignment
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh kasus
Pompa B
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh kasus
Pompa B
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh kasus
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Pompa B
Contoh kasus
Pembuatan 3D Model
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh kasus
Pembuatan 3D Model
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh kasus
Pembuatan 3D Model
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh kasus Menentukan titik
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh kasus Menentukan titik
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh kasus Menentukan titik
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh kasus
Animasi
Visualisasi vibrasi yang terjadi pada motor dan pompa
RELIABILITY, AVAILBILITY, MAINTAINABILITY
Contoh kasus
Data fasa
RELIABILITY, AVAILBILITY, MAINTAINABILITY
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
THANK YOU
@adikariwisesa PT Adikari Wisesa
Indonesiaextreme-maintenance.com