Body Of Knowledge


Vibration Institute Body of Knowledge


Subject:

Category

I

II

III

IV

1. VIBRATION PRINCIPLES:

Cell
Cell
Cell
Cell

Basic motion

X

X

X

Cell

Period, frequency

X

X

X

Cell

Amplitude (Peak, peal-to-peak, RMS)

X

X

X

Cell

Parameters (Displacement, velocity, acceleration)

X

X

X

Cell

Units, unit conversions

X

X

X

Cell

Time and frequency domains

X

X

X

Cell

Vectors, modulation

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Cell

X

X

Phase

Cell

X

X

X

Natural frequency, resonance, critical speeds

X

X

X

X

Force, response, damping, stiffness

Cell
Cell

X

X

Instabilities, non-linear systems

Cell
Cell
Cell

X

Subject:

Category

I

II

III

IV

3. SIGNAL PROCESSING

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RMS/peak detection

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Cell
Cell

X

Analogue/digital conversion

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Cell
Cell

X

Analogue recording and digital sampling

Cell

X

X

X

FFT computation

Cell
Cell

X

X

FFT application

X

X

Cell
Cell

Time windows (Uniform, Hanning, flat-top)

Cell

X

X

Cell

Filters (Low pass, high pass, band pass, tracking)

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X

X

X

Anti-aliasing

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X

X

X

Bandwidth, resolution

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X

X

X

Noise reduction

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X

X

X

Averaging (Linear, synchronous time, exponential)

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X

X

X

Dynamic range

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X

X

X

Signal to noise ratio

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Cell
Cell

X

Spectral maps

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Cell

X

X

Subject:

Category

I

II

III

IV

5. FAULT ANALYSIS:

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Cell
Cell
Cell

Spectrum analysis harmonics and sidebands

Cell

X

X

X

Time waveform analysis

Cell

X

X

X

Phase analysis

Cell

X

X

X

Transient analysis

Cell
Cell

X

X

Orbital analysis

Cell
Cell

X

X

Shaft center-line analysis

Cell

X

X

X

Enveloping

Cell

X

X

X

Mass unbalance

Cell

X

X

Cell

Misalignment

Cell

X

X

Cell

Mechanical looseness

Cell

X

X

Cell

Rubs, instabilities

Cell
Cell

X

X

Bearing defects (rolling element, journal)

Cell

X

X

Cell

Electric motor defects

Cell

X

X

X

Flow induced vibration, aerodynamics and liquids

Cell
Cell

X

X

Gearbox analysis

Cell

X

X

Cell

Resonance and critical speeds

Cell

X

X

X

Turbomachinery

Cell
Cell

X

X

General fault recognition

X

Cell
Cell
Cell

Subject:

Category

I

II

III

IV

8. ACCEPTANCE TESTING:

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Cell
Cell
Cell

Test procedures

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X

X

X

Specifications and standards

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X

X

X

Reporting

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X

X

X

Subject:

Category

I

II

III

IV

10. REFERENCE STANDARDS:

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Cell
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ISO

Cell

X

X

X

IEC

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X

X

X

Relevant national standards

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X

X

X

Subject:

Category

I

II

III

IV

11. REPORTING AND DOCUMENTATION:

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Cell
Cell
Cell

Conditioning monitoring reports

Cell

X

X

Cell

Vibration diagnostic report

Cell

X

X

X

Subject:

Category

I

II

III

IV

13. ROTOR/BEARING DYNAMICS:

Cell
Cell
Cell
Cell

Rotor characteristics

Cell
Cell
Cell

X

Bearing characteristics

Cell
Cell
Cell

X

Rotor balancing

Cell
Cell
Cell

X

Subject:

Category

I

II

III

IV

2. DATA ACQUISITION:

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Cell
Cell
Cell

Instrumentation

X

X

X

X

Dynamic range, signal to noise ratio

Cell
Cell

X

X

Transducers

X

X

X

Cell

Sensor mounting, mounted natural frequency

X

X

X

Cell

Fmax acquisition time

Cell

X

X

Cell

Proximity sensor conventions

Cell

X

X

Cell

Triggering

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X

X

Cell

Test planning

Cell

X

X

X

Test procedures

X

X

X

X

Data formats

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X

X

Cell

Computer database upload/download

X

Cell
Cell
Cell

Recognition of poor data

X

X

X

Cell

Subject:

Category

I

II

III

IV

4. CONDITION MONITORING:

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Cell
Cell
Cell

Computer database set-up and maintenance

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Cell

X

Cell

Equipment evaluation and prioritization

Cell

X

Cell
Cell

Monitoring program design

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X

X

X

Alarm set-up (Narrowband, envelope)

Cell
Cell

X

Cell

Baseline assessments, trending

Cell

X

X

Cell

Route planning

Cell

X

X

Cell

Alternate technologies (e.g. oil analysis, wear debris analysis, infrared thermography, motor current analysis, acoustic emmission)

Cell
Cell

X

X

Fault condition recognition

X

X

Cell
Cell

Subject:

Category

I

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III

IV

6. CORRECTIVE ACTION:

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Cell
Cell
Cell

Shaft alignment

Cell

X

X

Cell

Field balancing

Cell

X

X

X

Replacement of machine parts

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Cell

X

Cell

Flow control

Cell
Cell

X

X

Isolation and damping

Cell
Cell

X

X

Resonance control

Cell
Cell

X

X

Basic maintenance action

X

X

X

Cell

Subject:

Category

I

II

III

IV

7. EQUIPMENT KNOWLEDGE:

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Cell
Cell
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Electric motors, generators and drives

X

X

X

Cell

Pumps and fans

X

X

X

Cell

Steam turbines, gas turbines

Cell

X

X

Cell

Compressors

X

X

X

Cell

Recprocating machinery

Cell

X

X

Cell

Rolling mills, paper machines, other process equipment

X

X

X

Cell

Machine tools

X

X

X

Cell

Structures, piping

X

X

X

Cell

Gearboxes

X

X

X

Cell

Rolling element bearings

Cell

X

X

Cell

Journal bearings

Cell

X

X

Cell

Gearing

Cell

X

X

Cell

Couplings, belts

Cell

X

X

Cell

Subject:

Category

I

II

III

IV

9. EQUIPMENT TESTING AND DIAGNOSTICS:

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Cell
Cell
Cell

Impact testing

Cell

X

X

X

Forced response testing

Cell

X

X

X

Transient analysis

Cell
Cell

X

X

Transfer functions

Cell
Cell

X

X

Damping evaluation

Cell
Cell

X

X

Cross channel phase

Cell
Cell

X

X

Operating deflection shapes

Cell
Cell

X

X

Modal analysis

Cell
Cell
Cell

X

Torsional vibration

Cell
Cell
Cell

X

Subject:

Category

I

II

III

IV

12. FAULT SEVERITY DETERMINATION:

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Cell
Cell
Cell

Spectrum analysis

Cell

X

X

X

Time wavefore analysis, orbit analysis

Cell

X

X

X

Levels: overall, narrowband, component

Cell

X

X

Cell

Severity charts: graphs and formula

Cell

X

X

X