Experimental results on the damping ratio in sample of a real umbilical

Luiz Guilherme de Oliveira Appel; Lívia Rampinelli Bozzo; Gabriel de Paula Dittrich; André Luís Condino Fujarra; Thiago Antonio Fiorentin; Andrea Piga Carboni; Marcos Alves Rabelo; Fábio Pompeo da Silva Mineiro; Carlos Alberto Duarte de Lemos

Experimental results on the damping ratio in sample of a real umbilical

Authors

Luiz Guilherme de Oliveira Appel Department of Mobility Engineering, Federal University of Santa Catarina https://orcid.org/0009-0007-3964-8962
Lívia Rampinelli Bozzo Department of Mobility Engineering, Federal University of Santa Catarina https://orcid.org/0000-0003-2903-2949
Gabriel de Paula Dittrich Department of Mobility Engineering, Federal University of Santa Catarina https://orcid.org/0009-0009-2497-4348
André Luís Condino Fujarra Department of Mobility Engineering, Federal University of Santa Catarina https://orcid.org/0000-0003-3538-5898
Thiago Antonio Fiorentin Department of Mobility Engineering, Federal University of Santa Catarina https://orcid.org/0000-0002-2559-7574
Andrea Piga Carboni Department of Mobility Engineering, Federal University of Santa Catarina https://orcid.org/0000-0002-8864-5879
Marcos Alves Rabelo Department of Mobility Engineering, Federal University of Santa Catarina https://orcid.org/0000-0001-5209-4940
Fábio Pompeo da Silva Mineiro Tecnologia de Risers e Submarinos, PETROBRAS https://orcid.org/0009-0006-4725-0826
Carlos Alberto Duarte de Lemos Tecnologia de Risers e Submarinos, PETROBRAS https://orcid.org/0009-0006-1529-1500

Abstract

The operation of offshore platforms depends on the functions performed by umbilical cables, among other structures. These slender multi-layered structures are designed to resist stresses imposed on them by the sea current and movement of the free-surface platform. Therefore, design interest lies on knowledge regarding their dynamic behaviour, in particular, their damping properties. The present work aims to experimentally characterize the structural damping ratio of a 6-meter long sample of a real umbilical cable, by means of decay tests and cyclical bending tests in air. Two dissipation regimes were observed during the decay tests. The most intense one, characterized by internal accommodation, is preponderant for larger displacements. It induces substantial increases in the damping ratio and natural oscillation period. The cyclical bending test corroborate this scenario. Furthermore, an assessment of the model applied to evaluate the damping ratio from the bilinear hysteretic cycle revealed an overestimation of this quantity for large pos-slip displacements. A correction is proposed.

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Published

29-10-2025

Issue

Vol. 23 No. 1 (2026): Thematic Section: MecSol 2024

Section

MecSol 2024

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