A study on the simulation-based installation shape design method of steel lazy wave riser (SLWR) in ultra deepwater depth

Oh, Jae-Won; Jung, Dong-Ho; Kim, Hyungwoo; Min, Cheon-Hong; Cho, Sugil

doi:10.1016/j.oceaneng.2019.106902

Cited by 15 publications

(4 citation statements)

References 14 publications

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“…The deep-sea pilot mining robot has been developed by using various computer simulation-based design methods to reduce the cost of deep-sea experiment (Lee et al 2012;Yoon et al 2012;Oh et al 2014Oh et al , 2016Oh et al , 2020. The RBDO has been adopted in the early design process to ensure the reliability of the pilot mining robot under various environmental uncertainties (Choi et al 2011;Park et al 2014;Cho et al 2016;Kim et al 2019b, a).…”

Section: Rbdo Formulation and Resultsmentioning

confidence: 99%

Identification of marginal and joint CDFs using bivariate type I interval multiply censored data for RBDO of a pick-up device of a pilot mining robot

Kim

Cho

Lee

et al. 2021

Struct Multidisc Optim

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In this paper, joint probability distribution for the size and mass of deep-sea manganese nodules is investigated and reliabilitybased design optimization (RBDO) of a deep-sea pilot mining robot is performed. As the size and mass of the manganese nodules are strongly correlated and their data are given as bivariate type I interval multiply censored data, a new statistical modeling method should be developed to deal with these issues. However, this is significantly difficult as the conventional methods cannot resolve these issues and there is no prior knowledge of the two physical properties. The proposed method, which employs the multinomial distribution to define the likelihood function and the Akaike information criterion to select the fittest marginal distribution and copula, provides a systematic approach to find the joint probability distribution using the type I interval multiply censored data. To demonstrate the accuracy and effectiveness of the proposed method, two numerical examples are tested. Then, the RBDO of the pilot mining robot is performed using the joint probability distribution resulted from the proposed method.

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Section: Rbdo Formulation and Resultsmentioning

confidence: 99%

Identification of marginal and joint CDFs using bivariate type I interval multiply censored data for RBDO of a pick-up device of a pilot mining robot

Kim

Cho

Lee

et al. 2021

Struct Multidisc Optim

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“…Evaluate the S-shape characteristics of the riser through the S-shape coefficient. 27 The S-shape coefficient is calculated as follows:…”

Section: Installation Configuration Optimizationmentioning

confidence: 99%

A numerical study on the installation configuration design of steep wave riser (SWR) in deep water

Jia

Chen

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part M:

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A new calculation procedure is presented for the structural analysis of a steep wave riser (SWR) system. The equilibrium equation of the SWR is established based on Minimum total potential energy principle. The coupled equations are discretized by the finite difference method and then solved by Newton-Raphson technique. The accuracy of the numerical model is verified by Orcaflex software. Traditional parametric analysis of buoyancy factor, buoyancy section’s length, buoyancy section’s location and ocean current velocity are performed. An idea of engineering evaluation of the SWR’s working condition from the perspective of hang-off angle, tension, and bending radius is proposed. Through comparison, it is found that the hang-off angle is the main parameter affecting the installation safety of the SWR. And the allowable working water depth and installation span are determined. In addition, the optimization idea of the SWR’s configuration based on S-shape coefficient and hang-off angle is put forward, and the optimal configuration of a specific SWR is analyzed.

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“…However, they also pointed out that further research needed to be carried out on dynamic response of deep water lazy-wave riser. Ai et al [29], Hu et al [30], Oh et al [31] and Trapper [32] used the numerical methods to study the response characteristics of the Lazy-wave risers in offshore, deep and ultra-deep water areas, respectively. Cheng et al [33] proposed a numerical model based on three-dimensional large deformation rod theory.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of the subsea production system with lazy-wave risers attached to FPSO

Zhang,

Zhao,

Zhu

et al. 2023

PLoS ONE

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The lazy-wave riser is an input and output riser for a flexible development system, which is widely used in all the riser and pipeline systems. Because of the influence of various factors, its configuration description, control and motion which have a strong nonlinear character are complex during the running process of the lazy-wave riser. Reference to the specific structure and environmental parameters of a certain lazy-wave risers system with a 300 thousand tons FPSO, with the basis of the specific process of the flexible riser system at work, the lazy-wave risers were discretized into lumped mass models, combined with AQWA, the simplified dynamic model of the whole system at the depth of 2100m has been established by the large hydrodynamic analysis software OrcaFlex. The dynamic response characteristics of the lazy-wave risers have been given by using time domain coupling method. With and without the consideration of the 2nd wave drift load in the simulation process, the effects of the 2nd wave drift load on the results are obtained. The simulation results reveal the difficulty of simulation convergence caused by a large number of risers and flexible components. The 2nd order wave drift loads have a significant effect on the riser system, resulting in the increasement of the effective tension at each end of each riser. To counteract the magnitude of the FPSO response caused by such loads, the number of mooring lines needed to be increased or combined with dynamic positioning techniques to optimize the design.

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A study on the simulation-based installation shape design method of steel lazy wave riser (SLWR) in ultra deepwater depth

Cited by 15 publications

References 14 publications

Identification of marginal and joint CDFs using bivariate type I interval multiply censored data for RBDO of a pick-up device of a pilot mining robot

Identification of marginal and joint CDFs using bivariate type I interval multiply censored data for RBDO of a pick-up device of a pilot mining robot

A numerical study on the installation configuration design of steep wave riser (SWR) in deep water

Dynamic analysis of the subsea production system with lazy-wave risers attached to FPSO

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