Nonlinear self-modulation and subharmonic acoustic spectroscopy for damage detection and location

Solodov, I.; Wackerl, J.; Pfleiderer, K.; Busse, G.
June 2004
Applied Physics Letters;6/28/2004, Vol. 84 Issue 26, p5386
Academic Journal
A self-modulation mode of nonlinear acoustic vibrations of cracked detects has been analyzed and observed experimentally. Spectral patterns of the self-modulation are attributed to the sum-frequency type resonance in a multi-degree-of-freedom system and include a subharmonic spectrum as a particular case. Both the subharmonic and self-modulation modes demonstrate a high localization around the detect and provide opportunities for early detection and recognition of damaged areas.


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