Spectral Analysis iest, tri


For random measurement data the estimate of its spectrum i.e., frequency versus amplitude is perhaps the most important descriptor of the data beyond the time history. This course is designed to provide a comprehensive introduction to the basic processing of stationary and non-stationary random measurement data for purposes of Laboratory Vibration Test Specification (LVTS) development. The first half discusses the fundamentals of spectrum analysis and illustrate Fourier based non-parametric spectrum estimation. This includes consideration of random data with embedded sine-tones. The last half considers a general framework and illustration of the development of a LVTS. The objective of the course is to provide procedures for processing field measured random vibration data and using the processed information for LVTS development. The LVTS then may be used to qualify materiel for in-service use.

Course outline     Who should attend?     Course materials     Instructor     Next date and location      Pricing Information

Course outline

  • Introduction and Purpose
  • Historical Perspective
  • Motivation for Spectral Analysis
  • General Considerations
  • Time History Classification
  • Illustration of Time History Data
  • Deterministic Spectral Analysis
  • Stationary Stochastic/Harmonic Processes
  • Nonparametric Broadband Spectral Analysis
  • Harmonic Analysis (Discrete Component Processing)
  • Measurement Time History Validation
  • Aliasing Considerations
  • Linear Time-Invariant Filtering
  • Resampling
  • Spectral Analysis via Bandpass Filtering
  • One-Third Octave Band Filtering
  • Zoom Transform
  • Product Model for Processing Special Non-stationary Time Histories
  • Basics for Laboratory Vibration Test Specification Development
    • Fatigue Damage Modeling
    • Energy Response Spectrum
  • Summary


Who should attend?

  • Practicing test engineer
  • Advanced test technican


Course materials

  • Copy of PowerPoint presentation in course binder
  • Certificate of attendance for completion of CEUs

 Continuing Education Units: .6 CEUs


Ron Merritt


Ronald G. Merritt has more than 35 years experience. He has a Ph.D. in Engineering Mechanics. Merritt has worked as a Mechanical Engineer in the Life Cycle Environmental Engineering area at the Naval Air Warfare Center Weapons Division (NAWCWD), a contractor with Jacobs Technology with work related in the same area of NAWCWD, and is presently a contractor with ATAC.

Next date and location

May 11, 2023
9:00 a.m. - 4:30 p.m. Central TIme
In-person at ESTECH 2023 or Virtual
Click here to view registration information