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Título del libro: Proceedings Of The Asme 34th International Conference On Ocean, Offshore And Arctic Engineering, 2015, Vol 5b Título del capítulo: PARAMETER IDENTIFICATION OF A STEEL CATENARY RISER USING HILBERT AND WAVELET TRANSFORMS
This article presents a methodology for Multiple Degree of Freedom
(MDOF) systems to identify the modal parameters of a steel catenary
riser (SCR) by employing both the Hilbert and the wavelet transforms. To
validate the proposed approach, a set of experiments were performed in a
small scale model of a real SCR that is installed in the P18 platform
operating in Campos Basin, Brazil. During the experiments, the damping
factor along the SCR was modified by adding viscoelastic sandwich layers
on its structure. Each change was recorded with two accelerometers
mounted at the bottom of the riser; one of them was set to get
measurements in the catenary plane and the other one to get measurements
out of the plane. Then, in order to obtain the impulse response of the
structure from which is possible to obtain the modal parameters some
hammer impacts were applied at locations close to these accelerometers.
