Smart Structures and Systems

  • 제14권4호
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  • Pages.569-594
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  • 2014
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Influence of sharp stiffness variations in damage evaluation using POD and GSM

  • Thiene, M. (Department of Industrial Engineering, University of Padova) ;
  • Galvanetto, U. (Department of Industrial Engineering, University of Padova) ;
  • Surace, C. (Department of Structural, Geotechnical and Building Engineering)
  • 투고 : 2013.01.30
  • 심사 : 2013.10.19
  • 발행 : 2014.10.25
⟨ 이전 논문 다음 논문 ⟩

초록

Damage detection methods based on modal analysis have been widely studied in recent years. However the calculation of mode shapes in real structures can be time consuming and often requires dedicated software programmes. In the present paper the combined application of proper orthogonal decomposition and gapped smoothing method to structural damage detection is presented. The first is used to calculate the dynamic shapes of a damaged structural element using only the time response of the system while the second is used to derive a reference baseline to which compare the data coming from the damaged structure. Experimental verification is provided for a beam case while numerical analyses are conducted on plates. The introduction of a stiffener on a plate is investigated and a method to distinguish its influence from that of a defect is presented. Results highlight that the derivatives of the proper orthogonal modes are more effective damage indices than the modes themselves and that they can be used in damage detection when only data from the damaged structure are available. Furthermore the stiffened plate case shows how the simple use of the curvature is not sufficient when analysing complex components. The combined application of the two techniques provides a possible improvement in damage detection of typical aeronautical structures.

키워드

과제정보

연구 과제 주관 기관 : Ministry of Education, University and Research (MIUR)

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피인용 문헌

  1. Impact location in composite plates using proper orthogonal decomposition vol.64, 2015, https://doi.org/10.1016/j.mechrescom.2014.12.003
  2. Optimal sensor placement for maximum area coverage (MAC) for damage localization in composite structures vol.25, pp.9, 2016, https://doi.org/10.1088/0964-1726/25/9/095037
  3. Damage localisation in delaminated composite plates using a Gaussian process approach vol.50, pp.10, 2015, https://doi.org/10.1007/s11012-015-0193-1
  4. Robust multi-damage localisation using common eigenvector analysis and covariance matrix changes vol.111, pp.None, 2014, https://doi.org/10.1016/j.ymssp.2018.04.020
  5. Robust Baseline-Free Damage Localization by Using Locally Perturbed Dynamic Equilibrium and Data Fusion Technique vol.20, pp.20, 2014, https://doi.org/10.3390/s20205964