Paper Title:
Damage Identification of a Cantilever Beam with a Breathing Crack Based on Instantaneous Frequency
  Abstract

Damage identification for a cantilever beam with a breathing crack was presented based on instantaneous frequency(IF). One time-varying stiffness model was introduced by considering the breathing effect of the crack in vibration. A simplified single-degree-of-freedom(SDOF) time-varying dynamic differential equation was built. Relationships between the structural instantaneous frequencies (IFs) and damage location and degree were analyzed. IFs of the free vibration displacements were estimated by using phase difference and Teager energy operator (TEO).Moreover the influence of noise on IFs estimation was discussed. Damage indices were built by IFs and the damage degree was identified. Structural IFs are two-dimension function of damage location and degree and the intra-wave phenomenon of IFs verified the non-linearity of damaged structure. The damage indices based on IFs are more reliable than traditional frequency on identifying damage degree and have some anti-noise properties.

  Info
Periodical
Advanced Materials Research (Volumes 368-373)
Chapter
Chapter 5: Monitoring, Evaluation and Reinforcement Technique of Civil Engineering
Edited by
Qing Yang, Li Hua Zhu, Jing Jing He, Zeng Feng Yan and Rui Ren
Pages
2169-2174
DOI
10.4028/www.scientific.net/AMR.368-373.2169
Citation
Q. F. Wang, F. L. Huang, "Damage Identification of a Cantilever Beam with a Breathing Crack Based on Instantaneous Frequency", Advanced Materials Research, Vols. 368-373, pp. 2169-2174, 2012
Online since
October 2011
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Price
$32.00
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