Body of Knowledge

Body of Knowledge Overview 
(updated 2/4/13)

 
 
Subject:
Category
I II III IV
1. VIBRATION PRINCIPLES:
Basic motion X X X  
Period, frequency X X X  
Amplitude (Peak, peal-to-peak, RMS) X X X  
Parameters (Displacement, velocity, acceleration) X X X  
Units, unit conversions X X X  
Time and frequency domains X X X  
Vectors, modulation     X X
Phase   X X X
Natural frequency, resonance, critical speeds X X X X
Force, response, damping, stiffness     X X
Instabilities, non-linear systems       X
2. DATA ACQUISITION:
Instrumentation X X X X
Dynamic range, signal to noise ratio     X X
Transducers X X X  
Sensor mounting, mounted natural frequency X X X  
Fmax acquisition time   X X  
Proximity sensor conventions   X X  
Triggering   X X  
Test planning   X X X
Test procedures X X X X
Data formats   X X  
Computer database upload/download X      
Recognition of poor data X X X  
3. SIGNAL PROCESSING
RMS/peak detection       X
Analogue/digital conversion       X
Analogue recording and digital sampling   X X X
FFT computation     X X
FFT application X X    
Time windows (Uniform, Hanning, flat-top)   X X  
Filters (Low pass, high pass, band pass, tracking)   X X X
Anti-aliasing   X X X
Bandwidth, resolution   X X X
Noise reduction   X X X
Averaging (Linear, synchronous time, exponential)   X X X
Dynamic range   X X X
Signal to noise ratio       X
Spectral maps     X X
4. CONDITION MONITORING:
Computer database set-up and maintenance     X  
Equipment evaluation and prioritization   X    
Monitoring program design   X X X
Alarm set-up (Narrowband, envelope)     X  
Baseline assessments, trending   X X  
Route planning   X X  
Alternate technologies (e.g. oil analysis, wear debris analysis, infrared thermography, motor current analysis, acoustic emmission)     X X
Fault condition recognition X X    
5. FAULT ANALYSIS:
Spectrum analysis harmonics and sidebands   X X X
Time waveform analysis   X X X
Phase analysis   X X X
Transient analysis     X X
Orbital analysis     X X
Shaft center-line analysis   X X X
Enveloping   X X X
Mass unbalance   X X  
Misalignment   X X  
Mechanical looseness   X X  
Rubs, instabilities     X X
Bearing defects (rolling element, journal)   X X  
Electric motor defects   X X X
Flow induced vibration, aerodynamics and liquids     X X
Gearbox analysis   X X  
Resonance and critical speeds   X X X
Turbomachinery     X X
General fault recognition X      
6. CORRECTIVE ACTION:
Shaft alignment   X X  
Field balancing   X X X
Replacement of machine parts     X  
Flow control     X X
Isolation and damping     X X
Resonance control     X X
Basic maintenance action X X X  
7. EQUIPMENT KNOWLEDGE:
Electric motors, generators and drives X X X  
Pumps and fans X X X  
Steam turbines, gas turbines   X X  
Compressors X X X  
Recprocating machinery   X X  
Rolling mills, paper machines, other process equipment X X X  
Machine tools X X X  
Structures, piping X X X  
Gearboxes X X X  
Rolling element bearings   X X  
Journal bearings   X X  
Gearing   X X  
Couplings, belts   X X  
8. ACCEPTANCE TESTING:
Test procedures X X    
Specifications and standards   X X  
Reporting   X X  
9. EQUIPMENT TESTING AND DIAGNOSTICS:
Impact testing   X X X
Forced response testing   X X X
Transient analysis     X X
Transfer functions     X X
Damping evaluation       X
Cross channel phase     X X
Operating deflection shapes     X X
Modal analysis       X
Torsional vibration       X
10. REFERENCE STANDARDS:
ISO   X X X
IEC   X X X
Relevant national standards   X X X
11. REPORTING AND DOCUMENTATION:
Conditioning monitoring reports   X X  
Vibration diagnostic report   X X X
12. FAULT SEVERITY DETERMINATION:
Spectrum analysis   X X X
Time wavefore analysis, orbit analysis   X X X
Levels: overall, narrowband, component   X X  
Severity charts: graphs and formula    X X X
13. ROTOR/BEARING DYNAMICS:
Rotor characteristics       X
Bearing characteristics       X
Rotor balancing       X
 
Certification Handbook

The Vibration Institute Certification Program for Vibration Analyst was accredited by the American National Standards Institute (ANSI) in March 2010.  The accreditation by ANSI guarantees that the Institute’s certification program provides fair and equal access to the certification policies and procedures that assess the qualifications of candidates on a standardized basis.

The Certification Handbook includes information on:

•  Benefits
•  Recognition
•  Terms of certification
•  Body of knowledge for certification
•  Recommendations for education, training, and experience
•  Examination requirements
•  Sources for self-study and review
•  Sample test questions