An Examination of Instantaneous Frequency as a Damage Detection Tool

7/29/01


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Table of Contents

An Examination of Instantaneous Frequency as a Damage Detection Tool

Damage Characterization

Available Data

Framework

The Concept of Instantaneous Frequency

Instantaneous Frequency

Instantaneous Frequency

Instantaneous Frequency

Instantaneous Frequency

Illustration of Instantaneous Frequency Selection using the Analytic Signal

Instantanoeus Frequency of a Linear Chirp

Mono-component & Multi-component signals

The Empirical Mode Decomposition

Application of EMD to a Simple Signal

Variance of the Instantaneous Frequency

The Hilbert Transform as a High Frequency Phase Selection

Numerical Example 1(a)

Example 1(b)

Phase Plots for IMF 1,2, and 3

Transfer Functions

Example 2(a)

Example 2(b)

Example 3

Final Remarks

Author: Burcu Gunes

Email: bvuran@lynx.neu.edu