Damage detection in stiffened plates by wavelet transform

J. M. Yang, Z. W. Yang

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Wavelet analysis has been a useful tool to detect damage in structures during recent decades. However, most researches are focused on the damage identification in basic structures, such as beams, plates, and bearings. In practical application, the basic structures do not exist alone. Instead, they are usually accompanied with one another. Stiffened structures are commonly used in ship structures and are investigated in this study. The present investigation focuses on the estimation of damage location of damaged stiffened structures by using the wavelet analysis. In numerical analysis, the first mode shape of the damaged stiffened panels is simulated by finite element method. In experimental analysis proposed in this study, four different damaged stiffened structures are considered. The damage locations are detected by two-dimensional discrete wavelet analysis. A step by step procedure for damage detection is listed in present investigation. Firstly, a shaker was used to make an impact on the damaged structure. Secondly, accelerometers were used to measure the vibration responses of the structure. In the third step, the first mode shape of the structure is obtained by using the wavelet packet. Finally, two-dimensional discrete wavelet analysis was applied to determine the location of cracks. The results of numerical analysis and experimental investigation reveal that the proposed method is applicable to detect single crack or multi-cracks of a stiffened structure. The experimental results also show that fewer measurement points are required by utilizing the proposed method in comparison to those presented in previous studies.

Original languageEnglish
Pages (from-to)221-235
Number of pages15
JournalJournal of Taiwan Society of Naval Architects and Marine Engineers
Issue number4
Publication statusPublished - 2009 Nov

All Science Journal Classification (ASJC) codes

  • Ocean Engineering
  • Mechanical Engineering

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