Structural health monitoring of fixed offshore structures using the bicoherence function of ambient vibration measurements |
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| Authors: | A.J. Hillis C.R.P. Courtney |
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| Affiliation: | a University of Bath, Department of Mechanical Engineering, Bath BA2 7AY, UK
b University of Bristol, Department of Mechanical Engineering, Bristol BS8 1TR, UK |
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| Abstract: | This paper investigates the use of the bicoherence function of measured structural acceleration to provide automatic early detection of damage in an offshore structure. A detailed simulation model is developed, including realistic wave loading, and is used to assess the performance of the method. The method is shown through analytical and numerical analysis to be insensitive to typical operating parameter variations and to variations in wave excitation force. It is demonstrated that very small changes in stiffness of individual structural members are detectable from measurements of global structural motion. |
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