-
Filters: Low pass, band pass, high pass, band stop
-
Sampling, aliasing, dynamic range
-
Signal-to-noise ratio
-
Resolution, Fmax, data collection time
-
Averaging: linear, overlap, peak hold, time synchronous
-
Windowing and leakage
-
Order tracking
-
Cross-channel measurements
-
Correlation and coherence
-
Collecting data – ensuring you have the correct setup
-
When should you use time waveform analysis?
-
Diagnosing unbalance, misalignment, bent shaft, eccentricity, cocked bearing, resonance, looseness, and other conditions Phase analysis
-
Bubble diagrams
-
Diagnosing unbalance, misalignment, bent shaft, eccentricity, cocked bearing, resonance, looseness, and other conditions
-
-
-
Natural frequencies and resonances
-
Mass, stiffness, and damping
-
SDOF and MDOF
-
Run-up coast down tests
-
Bode plots and Nyquist (polar) plots
-
Impact and bump tests Operating Deflection Shape (ODS) analysis
-
Can we prove the existence of a natural frequency?
-
Visualizing vibration
-
Setting up the job
-
Collecting phase readings correctly
-
Interpreting the deflection shape
-
Using Motion Amplification
-
-
-
How does modal analysis differ from ODS?
-
How does Finite Element Analysis (FEA) differ from modal analysis
-
A quick review of the modal testing process Correcting resonances
-
The effect of mass and stiffness
-
Beware of nodal points
-
Adding damping
-
A ‘trial and error’ approach
-
A ‘scientific’ approach
-
Isolation
-
Tuned absorbers and tuned mass dampers
-
Why do bearings fail?
-
Cocked bearing, sliding on the shaft or inside the housing, looseness
-
EDM and DC motors and VFDs
-
Bearing frequencies and what to do when you don’t have all the details
-
The four stages of bearing degradation
-
Ultrasound
-
High-frequency detection techniques
-
Shock Pulse, Spike Energy, Peak Vue, and other techniques
-
Demodulation/enveloping
-
Selecting the correct filter settings
-
Spectrum analysis
-
Time waveform analysis
-
Low-speed bearings Journal bearing fault detection
-
What are journal bearings?
-
Measuring displacement
-
Introduction to orbit plots
-
Using your analyzer to acquire orbit plots
-
Introduction to centerline diagrams
-
Eccentricity ratio
-
Glitch removal
-
How the orbit changes with pre-load, unbalance, misalignment, instabilities, oil whir and whip
-
-
-
How do motors work?
-
Diagnosing a range of fault conditions: eccentric rotor, eccentric stator, soft foot, phasing, broken rotor bars, rotor bar, and stator slot pass frequencies
-
Motor current analysis
-
Unique fault conditions
-
Flow turbulence, recirculation, cavitation
-
Spectrum analysis versus time waveform analysis
-
Wear particle analysis
-
Gearmesh, gear assembly phase frequency (and common factors)
-
Tooth load, broken teeth, gear eccentricity and misalignment, backlash and more
-
-
-
General maintenance repair activities
-
Review of the balancing process and ISO balance grades
-
Review of shaft alignment procedures
-
Defining the program
-
Setting baselines
-
Setting alarms: band, envelope/mask, statistical
-
Setting goals and expectations (avoiding common problems)
-
Report generation
-
Reporting success stories
-
Acceptance testing
-
Review of ISO standards
-
This content is protected, please login and enroll in the course to view this content!
Spectrum analysis
Spectrum analysis
Low-speed bearings Journal bearing fault detection
Low-speed bearings Journal bearing fault detection