WEBINAR MAINTENANCE SERIES

ADVANCED VIBRATION

ANALYSIS

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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

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Sesi

Pertama

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Pengantar vibrasi

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Pengantar vibrasi

.

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Karakteristik Vibrasi

Amplitudo

Frekuensi

Fasa

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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

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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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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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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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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

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Frequency = 1

T= Cycles

Second

1

Period=

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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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Karakteristik vibrasi

Fasa

Ukuran yang menyatakan beda

waktu antara dua kejadian (vibrasi)

yang memiliki frekuensi yang sama.

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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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Karakteristik vibrasi

Fasa (bersambung)

Fasa Absolut

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Karakteristik vibrasi

Fasa (bersambung)

Fasa Absolut

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Karakteristik vibrasi

Fasa (bersambung)

Fasa Absolut

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Karakteristik vibrasi

Fasa (bersambung)

Fasa Relatif

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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

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

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Vibration Fundamental

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Timewaveform

Spectrum

Fault condition vibrasi

Unbalance

Misalignment

Looseness

Resonance

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Fault condition Unbalance

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Fault condition Unbalance

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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.

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Bump test

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Spektrum hasil bump test

Bump test

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Contoh Kasus

Pompa A

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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

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Spektrum

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Contoh Kasus

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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

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Sesi kedua

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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

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Operating deflection shape Pengambilan data

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Contoh kasus

Pompa B

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Contoh kasus

Pompa B

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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

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Pompa B

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Pompa B

Contoh kasus

Pembuatan 3D Model

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Pembuatan 3D Model

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Pembuatan 3D Model

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Contoh kasus Menentukan titik

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Contoh kasus Menentukan titik

RELIABILITY, AVAILBILITY, MAINTAINABILITY

Contoh kasus Menentukan titik

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Contoh kasus

Animasi

Visualisasi vibrasi yang terjadi pada motor dan pompa

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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

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THANK YOU

@adikariwisesa PT Adikari Wisesa

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