Investigation of the threshold behavior of subharmonics for damage detection of a structure with a breathing crack

David R. Johnson; K. W. Wang; Jun-Sik Kim

doi:10.1117/12.847333

9 April 2010 Investigation of the threshold behavior of subharmonics for damage detection of a structure with a breathing crack

David R. Johnson, K. W. Wang, Jun-Sik Kim

Author Affiliations +

Proceedings Volume 7650, Health Monitoring of Structural and Biological Systems 2010; 765032 (2010) https://doi.org/10.1117/12.847333
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

The Nonlinear System Identification methodology uses nonlinear signal content generated by a structure with a breathing crack in order to locate the damage. A subharmonic response is one type of signal that is useful in the methodology, but subharmonic responses may not always occur and are dependent upon the input excitations. The goal herein is to find a condition on the excitation to the structure which will produce subharmonics. In this study, through analysis of a single degree of freedom oscillator, which shares similar physics with a cracked structure, such a condition is found to determine the forcing frequency needed to produce subharmonics. This condition is then verified using a finite element model of a cracked rod.

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David R. Johnson, K. W. Wang, and Jun-Sik Kim "Investigation of the threshold behavior of subharmonics for damage detection of a structure with a breathing crack", Proc. SPIE 7650, Health Monitoring of Structural and Biological Systems 2010, 765032 (9 April 2010); https://doi.org/10.1117/12.847333

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