Parametrically excited vibrations of marine riser under random wave forces and earthquake

Zw, Wu; Liu, Jiankang; Zq, Liu; Lu, Zhong-Rong

doi:10.1177/1369433216630046

Cited by 11 publications

(9 citation statements)

References 26 publications

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“…For comparison, the peak acceleration of these accelerograms is adjusted to 0.2 , corresponding to earthquakes with an intensity factor of 8 as shown in Figure 3 and Table 2 [16,21].…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Dynamic Response Analysis of Cable of Submerged Floating Tunnel under Hydrodynamic Force and Earthquake

Mei

2017

Shock and Vibration

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A simplified analysis model of cable for submerged floating tunnel subjected to parametrically excited vibrations in the ocean environment is proposed in this investigation. The equation of motion of the cable is obtained by a mathematical method utilizing the Euler beam theory and the Galerkin method. The hydrodynamic force induced by earthquake excitations is formulated to simulate real seaquake conditions. The random earthquake excitation in the time domain is formulated by the stochastic phase spectrum method. An analytical model for analyzing the cable for submerged floating tunnel subjected to combined hydrodynamic forces and earthquake excitations is then developed. The sensitivity of key parameters including the hydrodynamic, earthquake, and structural parameters on the dynamic response of the cable is investigated and discussed. The present model enables a preliminary examination of the hydrodynamic and seismic behavior of cable for submerged floating tunnel and can provide valuable recommendations for use in design and operation of anchor systems for submerged floating tunnel.

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“…For comparison, the peak acceleration of these accelerograms is adjusted to 0.2 , corresponding to earthquakes with an intensity factor of 8 as shown in Figure 3 and Table 2 [16,21].…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Dynamic Response Analysis of Cable of Submerged Floating Tunnel under Hydrodynamic Force and Earthquake

Mei

2017

Shock and Vibration

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“…In the tension leg deck (TLD) system of FPDSO, four equivalent risers are fixed symmetrically at four corners of the deck. Following previous studies (Ni et al, 2018; Wu et al, 2016), the TLD system can be simplified as a one-quarter model. Figure 1 shows the simplified model of parametrically excited marine riser of the TLD system, and the origin of the Cartesian coordinate system is set at the anchor point on the sea bed.…”

Section: Analytical Derivationmentioning

confidence: 99%

“…The free surface of the wave and water particle velocity are treated as multi-frequency, and the frequency components are obtained through Pierson–Moskowitz spectrum based on linear wave theory. In this study, the classical method, that is, random phase spectrum method (Lei et al, 2017; Wu et al, 2016) is used to simulate the stochastic wave force in the time domain. With given wave parameters, the stochastic wave surface and velocity can be simulated by applying the superposition principle of sinusoidal waves and then the time history data for the stochastic hydrodynamic force acting on the riser is readily generated.…”

Section: Analytical Derivationmentioning

confidence: 99%

Dynamic analysis of parametrically excited marine riser under simultaneous stochastic waves and vortex

Xie

Mei

et al. 2018

Advances in Structural Engineering

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This study investigates the dynamic analysis of parametrically excited marine riser under simultaneous stochastic waves and vortex. A general analysis considers the parametric excitation resulting from platform motion, ocean wave loading directly on the rise, and vortex-shedding excitation due to flow bypassing the risers. Stochastic wave force and vortex excitation acting on the riser in the time domain is formulated by the stochastic phase spectrum method and derived by the linear-wave theory using a Pierson–Moskowitz wave spectrum to simulate real sea conditions. A derived parametrically excited top tensioned riser model subjected to simultaneous stochastic waves and vortex excitations is proposed. The efficacy of the present method is assessed by solutions obtained from other existing methods and experimental data of two test models. The present method is evaluated by solutions computed from existing methods and experimental data of two test models, and a general good agreement of the analyses between the proposed approach and other methods is observed. The availability of resonance, parametric stability, energy distribution and transfer, and the sensitivity of key parameters estimated by single-frequency and multi-frequency excitation are compared and discussed. Comparing with the results obtained from the harmonic excitation method, the present method can be used to make more reasonable and accurate calculations of the dynamic response of risers operating in real sea conditions.

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“…Many studies have been devoted to the issue of parametric excitation of offshore structures in which a coefficient appears as function of time in the governing differential equation. Said studies have included the research about risers and cables (Chatjigeorgiou, 2004;Chatjigeorgiou andMavrakos, 2005, 2002;Franzini et al, 2015;Franzini and Mazzilli, 2016;Hsu, 1975;Kuiper et al, 2008;Lei et al, 2014;Park and Jung, 2002;Prado et al, 2014;Wang et al, 2015;Wu et al, 2016;Xiao and Yang, 2014;Yang et al, 2013;Yang and Xiao, 2014;Zhang and Tang, 2015), tethers for tension-leg platforms Park, 1995, 1991), submerged floating pipelines (Yang et al, 2017) and parametric rolling of ships (Pipchenko, 2009;Thomas et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the frequency of said motion has dominant effect on the stresses at the upper part. Other researchers have investigated parametric excitation of risers have included other phenomena such as sea wave forces (Lei et al, 2014;Wu et al, 2016), vortex-induced vibrations (Wang et al, 2015;Yang and Xiao, 2014) and earthquake excitation (Wu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Long-term stochastic heave-induced dynamic buckling of a top-tensioned riser and its influence on the ultimate limit state reliability

Cabrera-Miranda

Paik

2018

Ocean Engineering

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A top-tensioned riser is a slender pipe that conveys fluids between a floater and a subsea system. High top-tension keeps its straight configuration and helps to prevent compressive loads. Because of the floater's heave motion, the tension on the riser fluctuates giving rise to dynamic buckling. This paper examines the dynamic buckling characteristics of a top-tensioned riser analyzing the governing equation with nonlinear damping. The equation is discretized in space by the finite difference method and then is numerically integrated by the Runge-Kutta method. As main objective, an ultimate limit state function for risers is used to investigate its reliability during parametric excitation. While the short-term stationary Gaussian random motion of a floater can be described by a response spectrum, the uncertainties of a long-term response are considered by Monte Carlo simulation. In view of an applied example, it is found that the dynamic buckling would occur often, and although the probability of failure is acceptable, it can cause serious failure when axial excitation is of significance in harsher sea states. This study aims to contribute in clarifying the role of parametric vibrations (dynamic buckling) in the reliability of risers for ultimate limit state.

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Parametrically excited vibrations of marine riser under random wave forces and earthquake

Cited by 11 publications

References 26 publications

Dynamic Response Analysis of Cable of Submerged Floating Tunnel under Hydrodynamic Force and Earthquake

Dynamic Response Analysis of Cable of Submerged Floating Tunnel under Hydrodynamic Force and Earthquake

Dynamic analysis of parametrically excited marine riser under simultaneous stochastic waves and vortex

Long-term stochastic heave-induced dynamic buckling of a top-tensioned riser and its influence on the ultimate limit state reliability

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