Active control of axial dynamic response of deepwater risers with Linear Quadratic Gaussian controllers

Zhang, Wenshou; Li, Dongdong

doi:10.1016/j.oceaneng.2015.09.018

Cited by 17 publications

(8 citation statements)

References 29 publications

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“…Based on the conceptual design of FDPSO-TLD, the dynamic model of the TLD (tension deck) system is established by Lei et al (2015) to investigate the axial dynamic response of the riser caused by ship heave. Zhang and Li (2015) studied the influence of the phugoid motion of the floating ship on the axial tension. OrcaFlex software was used by Gong et al (2014) to study the dynamic superposition effect, including surface wave, ocean current, pipeline transport ship motion, and the collision between the pipeline and the pipe support roller.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Dynamic boundary of floating platform and its influence on the deepwater testing tube

He¹,

Guo

et al. 2020

European Journal of Remote Sensing

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The motion of the floating platform is one of the important factors influencing the safety of testing string. The allowable motion limits of various floating drilling platforms are discussed and their calculation formulas are presented, based on which the nonlinear dynamic response characteristics of the testing tube are investigated through ABAQUS software. Results show that an excessive offset of floating platform will cause many problems to testing tube, such as operation difficulty in rising and landing pipe string, disconnection difficulty of testing tree in case of emergency. Under heave motion and slow drift motion condition, the maximum Mises stress appears in the part closed to the upper end. The heave and horizontal motions of the platform have a superposition influence on the axial force of the pipe. So, a more precise dynamic theoretical model should be developed to study the longitudinal-transverse coupled vibration of testing string in the future.

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Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Dynamic boundary of floating platform and its influence on the deepwater testing tube

He¹,

Guo

et al. 2020

European Journal of Remote Sensing

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“…In previous studies (Kuiper et al, 2008; Lei et al, 2014; Zhang and Li, 2015), the heave motion of the hull is usually simplified as a single frequency motion in a harmonic form as follows…”

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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“…A riser is a pipe that links an offshore Floating Production System or a Drilling Rig to a subsea network for production purposes such as exploration, manufacturing, injection and export, or mining, finishing and processing purposes. Figure 1 shows the sketch of a Floating Production, Drilling, Storage and Offloading (FPDSO) [1]. Risers are regarded as the most essential component in the construction of an offshore pipeline, considering the complex loads and the harsh operating conditions that they have to withstand.…”

Section: Introductionmentioning

confidence: 99%

Flow Past of a Drilling Riser System with Auxiliary Lines in Laminar Flow

Rahman

Alias²,

Mohd³

2023

CFDL

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Vortex-Induced Vibration (VIV) has emerged as a crucial problem that may arise during a drilling operation, which could result in riser failure. Engineers focus on drilling riser's flow characteristics and controls with the intention of improving the drilling environment. Auxiliary lines or control rods are usually placed around the main drilling riser to suppress the VIV. However, the issue related to the flow past drilling riser system with auxiliaries has yet to be resolved. The flow characteristics around a riser system with auxiliaries were analysed in this research. The simulations were conducted using Computational Fluid Dynamics (CFD) software, Altair AcuSolve. This work focuses on the influence of various gap ratios (G/D) and diameter ratios (d/D) on the vortex interaction. A main cylinder with six auxiliary lines was modelled with G/D of 0 to 2.0 and d/D of 0.10 to 0.60 to simulate the riser system. The simulations were carried out at Reynold Number of 200 in the laminar flow regime. The results revealed that the hydrodynamic forces decreased when d/D and G/D increased. The vortex shedding was significantly reduced for auxiliary lines with G/D between 0.3 and 1.4. The numerical simulation results indicated that the vortex interaction in the wake region was, and the hydrodynamic forces were reduced due to the auxiliary lines configurations. The findings of this study are intended to contribute a new CFD simulation result for a better prediction of VIV on a drilling riser with auxiliary lines.

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Active control of axial dynamic response of deepwater risers with Linear Quadratic Gaussian controllers

Cited by 17 publications

References 29 publications

RETRACTED ARTICLE: Dynamic boundary of floating platform and its influence on the deepwater testing tube

RETRACTED ARTICLE: Dynamic boundary of floating platform and its influence on the deepwater testing tube

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

Flow Past of a Drilling Riser System with Auxiliary Lines in Laminar Flow

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