Abstract
Offshore oil exploitation at increasing water depths has been carrying out studies focused on improving riser response prediction. In order to have a safety design of flexible risers it is necessary to evaluate its dynamic characteristics, mainly the damping factor. This parameter is obtained experimentally and the usual techniques sometimes are not appropriated. For these techniques the damping factor is considered constant, but some tests performed in COPPE’s Lab showed that this is not completely true. In order to estimate the damping factors of a multi-degree of freedom system, cross-sections of Continuous Wavelet Transforms (CWT) based on the Morlet wavelet function from time-domain responses are used. The procedures are then tested on signals acquired from the lateral vibration of a flexible riser. Non-linearity analysis capabilities are also verified.
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