Structural health monitoring of fixed offshore structures using the bicoherence function of ambient vibration measurements

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. Th...

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Bibliographic Details
Published in:Journal of sound and vibration 2011-03, Vol.330 (6), p.1141-1152
Main Authors: Hillis, A.J., Courtney, C.R.P.
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Computer simulation
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Health monitoring (engineering)
Hydraulic constructions
Mathematical analysis
Mathematical models
Measurement and testing methods
Numerical analysis
Offshore structure (platforms, tanks, etc.)
Offshore structures
Physics
Solid mechanics
Structural and continuum mechanics
Structural members
Vibration
Vibration measurement
Wave excitation
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Summary: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.
ISSN:0022-460X
1095-8568
DOI:10.1016/j.jsv.2010.09.019