Data Analysis (194)

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Chapter Outline

Chapter 13, Course 196 - Data Analysis (Vibration and Shock Test Control Techniques)

  • Counts to Engineering-Unit Conversion
    • Counts-to-Volts Conversion
    • Volts-to-Engineering Units (EU) Conversion
    • Polynomial Approximation
    • Linear Segment Approximation
  • Noise Reduction, Smoothing and Filtering
    • Noise Removal (Filtering)…“Smoothing by N”
    • Noise Removal…Exponential Smoothing
    • Exponential vs “by N” Smoothing…Time Response
    • Exponential vs “by N” Smoothing…Filter Shape
    • Filtering in the Spectral Domain
  • Data Resampling (Interpolation)
    • Time-Domain Interpolation
    • Resampling/Interpolation…Example
    • Pulse Interpolation Example
    • Data Interpolation…When is it Needed?
  • Instrumentation and Filter Distortion Correction
    • DownSampling
    • One Strategy (that Minimizes Sample Rate)
    • Problem …. The System Transfer Function
    • The Effect of Signal-Path Components
    • Making Results Agree/What Does “Normalize” Mean?
    • Defining a “Standard System Transfer Function”
    • System Transfer-Function-Normalization Function
    • Satisfying Standards (SAE)
  • Recommendations
    • Shock (SRS) Testing…
    • Recommendation: Vibration & Acoustic Testing
  • Removal of Aliased Data from Time Histories
    • Time History Analysis-Alias Signal Rejection
    • Sampling Strategy
    • Analog (Anti-Alias Filter 4-Pole Bessel at 8 kHz)
    • Analog Low-Passed—4 Pole Bessel at 8 kHz
    • Acquired Data—20 K S/S
    • Low Pass Filtered (Digital) at 4110 Hz
  • A Better Sampling Strategy