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

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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.
Original languageEnglish
Pages (from-to)1141-1152
Number of pages12
JournalJournal of Sound and Vibration
Volume330
Issue number6
Early online date12 Oct 2010
DOIs
Publication statusPublished - 14 Mar 2011

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vibration measurement
Vibration measurement
structural health monitoring
Offshore structures
Structural health monitoring
loading waves
structural members
Structural members
wave excitation
numerical analysis
Numerical analysis
stiffness
Stiffness
damage
simulation

Cite this

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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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