Time Waveform Analysis on Rotating Machinery


This three-day seminar provides in-depth coverage of Time Waveforms and how they can be used to detect a wide variety of faults, plus how they can be used to assess the severity of such faults. While the focus of the class is on vibration time waveforms, it likewise clearly shows how a different approach should be taken when acquiring and evaluating High Frequency Envelope (HFE) waveforms versus classic vibration waveforms (including a difference in setup parameters for HFE waveforms).


  • Shows how to detect faults using waveform “pattern recognition” and provides real insight on evaluating fault severity.


  • Proves how waveforms often are a much better indicator of fault severity - particularly those caused by bearing, gear, lubrication, rotor rub and impact-type problems.


  • Includes a series of real-world case studies to clearly demonstrate how time waveforms should best be used to evaluate rotating machinery.


  • Recommended Minimum Vibration Analysis Experience = 2 years.
  • Prior Experience with Spectral Analysis of Vibration data is recommended.

Seminar Agenda

  1. Introductory Time Waveform Concepts
  2. Recommended Measurement Setups for Time Waveform Analysis
  3. Displacement vs. Velocity vs. Acceleration Waveforms
  4. Problems Detectable Only by Time Waveform Analysis
  5. Problems for which Time Waveform Analysis Adds Confirming Evidence to Spectral Analysis
  6. How to Detect Specific Faults using Time Waveform Analysis:
    • Cracked or Broken Gear TeethTechnical Associates Time Waveform Analysis, time waveform
    • Worn Gear Teeth
    • Eccentric Gears
    • Rolling Element Bearing Faults
    • Rolling Element Bearing Slipping on a Shaft
    • Fluid Film Bearing Wear
    • Misalignment vs. Mechanical Looseness
    • Lubrication problems
    • Rotor Rub
  7. Periodic vs. Nonperiodic Time Waveforms - Why is This Important?
  8. Effect of Impacting on Time Waveforms and Spectra
  9. Importance of Waveform Resolution to Reveal Impact and True Peak Amplitude
  10. Crest Factor used to Assess Amount of Impacting Present in a Waveform
  11. Autocorrelation & Circular Time Waveform Diagnostics
  12. How to Detect Inadequate Lubrication Using TWA and Autocorrelation
  13. Transient Analysis to Detect Damaging Random Events
  14. How to Specify and Interpret Time Waveforms for High Frequency Envelope (HFE) Measurements
  15. Special Time Waveforms: When to and When not to use a Special TWF for Both Normal Vibration and for HFE Measurements
  16. Synchronous Time Averaging - What is it and When Should it be Used?
  17. Real-World Time Waveform Analysis Case Studies

Seminar Fee: $1395

A $100 DISCOUNT will be given for payments at least 60 DAYS prior to the seminar start date.

Seminar Fees include textbook, breaks and lunches.




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1230 West Morehead Street, Suite 400

Charlotte, North Carolina  28208