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Parameter Identification of a Steel Catenary Riser Using Hilbert and Wavelet Transforms

[+] Author Affiliations
Lizeth Torres, Cristina Verde

Universidad Nacional Autónoma de México, Coyoacán, México D.F., Mexico

Flavia Borges, Carlos Magluta, Ney Roitman

Universidade Federal do Rio de Janeiro Cidade Universitria, Ilha do Fundão, Brazil

Paper No. OMAE2015-41246, pp. V05BT04A045; 7 pages
doi:10.1115/OMAE2015-41246
From:
  • ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 5B: Pipeline and Riser Technology
  • St. John’s, Newfoundland, Canada, May 31–June 5, 2015
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5652-9
  • Copyright © 2015 by ASME

abstract

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.

Copyright © 2015 by ASME

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