Mooring line tension observed through a maximum entropy spectrum |
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Authors: | Svein Ivar Sagatun Finn Gunnar Nielsen Erling Handal Nils Veland |
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Institution: | (1) Norsk Hydro Exploration and Production ASA, Research Center, Department of Marine Science, N5020 Bergen, Norway, NO;(2) Det norske Veritas,Oslo, Norway, NO |
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Abstract: | A method for measuring mooring line tension is proposed based on observation of the natural frequencies of the mooring line
segment between the winch and the fairlead. The anchor line tension is observed through the string equation where an analytical
expression for the line's eigen-frequencies is obtained. The tension is observed on line by utilizing a nonparametric system
identification approach in which the peaks of a maximum entropy spectrum of the transverse acceleration measures of the vibrating
string are automatically identified. The method is verified against full-scale data from the Troll B floating concrete oil
production platform operating in the North Sea.
Received for publication on Feb. 24, 1999; accepted on July 26, 1999 |
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Keywords: | : mooring line tension observer maximum entropy |
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