Journal
OCEAN ENGINEERING
Volume 140, Issue -, Pages 43-49Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2017.05.021
Keywords
Offshore platform; Modal analysis; Structural damage; Modal strain energy
Funding
- National Natural Science Foundation of China [51175485]
- Shandong Province Natural Science Foundation [Y2005F16]
- Fundamental Research Funds for the Central Universities [201513043]
- Shandong Province Foundation [BS2015HZ016]
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Nowadays, natural load excitation cannot detect all modal problems when testing vibration responses of offshore platforms. To overcome this issue, the present paper proposes a novel method to detect structural damages of offshore platforms based on grouping modal strain energy. This method divides the unit modal strain energy into axial tension-compression and bending. It may not only expand known modals and overcome the incomplete modal parameters under natural load excitation, but also could estimate the damage locations based on low-order modal parameters. The proposed method was verified by numerical simulations. Based on simulations on different damage conditions of a jacket offshore platform, damage locations could be determined accurately through comprehensive analysis of grouping modal strain energy distribution.
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