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This course is designed to advance the knowledge base of vibration analysts
who have one to three years of experience in the field. The course begins
with a brief review of Vibration Analysis Level 1 topics and then moves into
the in-depth applications of the illustrated diagnostic chart. Advanced
alarm setting techniques based on statistical analysis are explained for
both overall and band alarms. Advanced measurement techniques including
natural frequency testing and high frequency envelope signal analysis is
also covered. There is also a discussion on strategies for combining this
range of diagnostic techniques and alarm methods for maximum effectiveness
of your programme.
Prerequisites
This course will advance the expertise of plant personnel involved in
predictive maintenance or vibration analysis. Twelve to fifteen months
experience of vibration analysis and previous attendance at
Vibration Analysis Level
1, or similar course, is recommended.
The course material is generic and applies to all vendors' equipment. As
there will be calculations involved, delegates will be required to bring a
scientific calculator with them to the course.
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Day 1 |
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Introduction & Course Overview
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Brief review of the topics covered in the 'Analysis I' seminar
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Vibration fundamentals
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Vibration instruments
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Vibration transducers
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Role of enveloping, shock pulse and HFD
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Common pitfalls in everyday vibration measurements
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Principals of digital data acquisition and FFT processing for
reliable spectral analysis
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FFT parameters (# of lines, resolution, frequency range)
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Sampling and digitising data; Frequency aliasing and its
prevention
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FFT window selection; Types of averaging; Effects of overlap
processing
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Importance of bandwidth and frequency separation
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Difference and use of digital and analogue overall levels
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Dynamic range and its effects on display of frequencies
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Introduction to natural frequency test methods
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Difference between Natural Frequency, Resonance and Critical Speed
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Impulse Natural Frequency Tests
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Bode Plot & Polar Plot Acquisition and Interpretation
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Enhanced Vibration Diagnostics Using Phase Analysis & Cascade
Diagrams
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Phase defined; Hardware required; How to acquire and interpret
phase measurements
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Using Phase to find the operating deflection shape of a machine
and its supporting structure
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Day 2 |
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Concentrated vibration signature analysis using the vibration
diagnostic charts
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Review of problems covered in Analysis I
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Mass unbalance; Eccentric rotors; Bent shafts
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Misalignment; Mechanical looseness (3 types); Drive belt problems
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Detailed coverage on how to identify:
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Resonance problems; Possible resonance problems from survey data
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Approximate natural frequencies of rotors
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6
rolling element bearing failure scenarios, and when to replace
them
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Bearing and structural natural frequencies
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Plain bearing wear and clearance problems; Oil whirl; oil whip and
dry whip
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Rotor rub - partial rub and full annular rub
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Flow induced problems due to cavitations; re-circulation; flow
turbulence; aerodynamic forces
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Gear problems due to tooth wear; cracked or broken teeth;
eccentricity; misalignment; excessive loading and hunting tooth
problems
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Day 3 |
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Detailed coverage continued
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Electrical problems with induction motors due to eccentric rotors;
cracked, loose or broken rotor bars; thermally induced bow;
electrical phasing
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Beat vibration problems; Soft foot and distorted frame
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Introduction to narrowband envelope (statistical) alarms
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Defining narrowband alarms
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Generating narrowband alarms for new and existing databases
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How
to refine overall alarm levels and spectral band alarms using proven
statistical methods
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Introduction to enveloped and high frequency demodulated spectra
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How they are used to detect bearing; gear; lubrication and certain
electrical problems
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Introduction to vibration isolation
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Vibration isolation defined; How vibration isolators function;
Sample vibration isolator types
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Introduction to damping treatments
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Defining vibration damping; How damping affects resonant vibration
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Day 4 |
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Computer based case histories that have to be analysed and a report
on course of action submitted.
Certification Exam
The exam consists of a combination of written questions,
multiple-choice questions, labelling diagrams and completing tables.
This is a closed book exam, however a booklet of formulae will be
provided for use.
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70%
= Pass
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90%
= Pass with distinction
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