Data Analysis (194)

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Chapter Outline

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