Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Nonlinear random vibrations of moored floating structures under seismic and sea wave excitations
https://orcid.org/0000-0001-9505-9213
Abstract A numerical model is formulated for the nonlinear random vibrations of the offshore floating structures moored by cables under seismic and sea wave excitations. The upper end of each mooring cable is connected to the floating structure and the other end of each cable is fixed to the seabed. Nonlinear equations of motions of the mooring cables are formulated by using the nonlinear cable elements that are formulated based on the extended Hamilton principle. The floating platform is modeled as a rigid body with three degrees of freedom. The connection conditions which represent the relationships between the displacements of the floating platform and cables are given to derive the equations of motions of the whole system. The effects of nonlinear hydrodynamic drag forces and added-mass on both the floating platform and cables are taken into consideration. The random vibrations of the moored floating structure under both horizontal seismic ground motion and sea wave excitation are analyzed by using the Monte Carlo simulation method. The probability density functions of the displacements of the moored floating structure and the maximum tensile force in the cables are analyzed. The influences of different sag-to-span ratios, inclination angles and diameters of the mooring cables on the mean value and standard deviation of the displacements of the floating structure and the maximum tensile force in the cables are studied.
Highlights The nonlinear cable element is formulated based on extended Hamilton's principle. The nonlinear equations of motions of the cables and floating platform are formulated. The equations of motions of the whole system are got by connection conditions. The vibrations of the structure under seismic and wave excitations are analyzed.
Nonlinear random vibrations of moored floating structures under seismic and sea wave excitations
https://orcid.org/0000-0001-9505-9213
Abstract A numerical model is formulated for the nonlinear random vibrations of the offshore floating structures moored by cables under seismic and sea wave excitations. The upper end of each mooring cable is connected to the floating structure and the other end of each cable is fixed to the seabed. Nonlinear equations of motions of the mooring cables are formulated by using the nonlinear cable elements that are formulated based on the extended Hamilton principle. The floating platform is modeled as a rigid body with three degrees of freedom. The connection conditions which represent the relationships between the displacements of the floating platform and cables are given to derive the equations of motions of the whole system. The effects of nonlinear hydrodynamic drag forces and added-mass on both the floating platform and cables are taken into consideration. The random vibrations of the moored floating structure under both horizontal seismic ground motion and sea wave excitation are analyzed by using the Monte Carlo simulation method. The probability density functions of the displacements of the moored floating structure and the maximum tensile force in the cables are analyzed. The influences of different sag-to-span ratios, inclination angles and diameters of the mooring cables on the mean value and standard deviation of the displacements of the floating structure and the maximum tensile force in the cables are studied.
Highlights The nonlinear cable element is formulated based on extended Hamilton's principle. The nonlinear equations of motions of the cables and floating platform are formulated. The equations of motions of the whole system are got by connection conditions. The vibrations of the structure under seismic and wave excitations are analyzed.
Nonlinear random vibrations of moored floating structures under seismic and sea wave excitations
https://orcid.org/0000-0001-9505-9213
Abstract A numerical model is formulated for the nonlinear random vibrations of the offshore floating structures moored by cables under seismic and sea wave excitations. The upper end of each mooring cable is connected to the floating structure and the other end of each cable is fixed to the seabed. Nonlinear equations of motions of the mooring cables are formulated by using the nonlinear cable elements that are formulated based on the extended Hamilton principle. The floating platform is modeled as a rigid body with three degrees of freedom. The connection conditions which represent the relationships between the displacements of the floating platform and cables are given to derive the equations of motions of the whole system. The effects of nonlinear hydrodynamic drag forces and added-mass on both the floating platform and cables are taken into consideration. The random vibrations of the moored floating structure under both horizontal seismic ground motion and sea wave excitation are analyzed by using the Monte Carlo simulation method. The probability density functions of the displacements of the moored floating structure and the maximum tensile force in the cables are analyzed. The influences of different sag-to-span ratios, inclination angles and diameters of the mooring cables on the mean value and standard deviation of the displacements of the floating structure and the maximum tensile force in the cables are studied.
Highlights The nonlinear cable element is formulated based on extended Hamilton's principle. The nonlinear equations of motions of the cables and floating platform are formulated. The equations of motions of the whole system are got by connection conditions. The vibrations of the structure under seismic and wave excitations are analyzed.
Nonlinear random vibrations of moored floating structures under seismic and sea wave excitations
Wang, Kun (Autor:in) / Er, Guo-Kang (Autor:in) / Iu, Vai Pan (Autor:in)
Marine Structures ; 65 ; 75-93
28.12.2018
19 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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