WIT Press


Detecting Parametric Changes In Structures Using Resonant Chaos

Price

Free (open access)

Paper DOI

10.2495/HPS020521

Volume

59

Pages

10

Published

2002

Size

494 kb

Author(s)

I.B. Schwartz & I. Triandaf

Abstract

We present a technique for the detection of small adiabatic parameter changes in continuum mechanical structures. The technique relies on inducing chaos in general structures via an external oscillator, and measuring an appropriate time series in controlled and changed states. By exciting chaos at resonance, the dynamics naturally samples the structure at many wavelengths, and affords an excellent diagnostic tool for the detection of structural changes prior to damage onset. By using an embedding theory of time series, full phase space pictures resulting from changes in internal as well as external parameters may be detected. Two techniques are presented for comparison: A model based approach to detection, and a fully realizable time series method of detection. The theory behind the methods will be sketched, and illustrated with examples from continuum mechanics.

Keywords