Improvement of the bending behavior of a flexible riser: Part ii – hysteretic modeling of bending stiffness in global dynamic analysis

Kim, Jeong Du; Jang, Beom-Seon; Yun, Ran-Hui; Jeong, Hyeon-Su

doi:10.1016/j.apor.2020.102249

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…They investigated the effect of different axisymmetric loads on the bending characteristics, and the results of the calculations showed obvious hysteresis. The authors suggested that the bending characteristics of risers need to be taken into account segmentally when analyzing the dynamic response of unbonded flexible risers [120]. The multi-layer modeling method considering detailed geometry can effectively simulate the complex contact between and within the helical layer (mainly the carcass layer and pressure armor layer); in contrast, the corresponding numerical method is difficult to model with more elements, the calculation time is too long, and it is easy to cause the results to be non-convergent.…”

Section: Methodsmentioning

confidence: 99%

Section: Development Of Cross-sectional Properties Of An Unbonded Fle...mentioning

confidence: 99%

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Review of the Development of an Unbonded Flexible Riser: New Material, Types of Layers, and Cross-Sectional Mechanical Properties

Liu,

Qu,

Chen

et al. 2024

Materials

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Unbonded flexible risers consist of several helical and cylindrical layers, which can undergo large bending deformation and can be installed in different configurations to adapt to harsh marine environments; thus, they can be applied to transport oil and gas resources from ultra-deep waters (UDW). Due to their special geometric characteristics, they can ensure sufficient axial tensile stiffness while having small bending stiffness, which can undergo large deflection bending deformation. In recent years, the development of unbonded flexible risers has been moving in an intelligent, integrated direction. This paper presents a review of unbonded flexible risers. Firstly, the form and properties of each interlayer of an unbonded flexible riser are introduced, as well as the corresponding performance and configuration characteristics. In recent years, the development of unbonded flexible risers has been evolving, and the development of machine learning on unbonded flexible risers is discussed. Finally, with emphasis on exploring the design characteristics and working principles, three new types of unbonded flexible risers, an integrated production bundle, an unbonded flexible riser with an anti-H2S layer, and an unbonded flexible riser with a composite armor layer, are presented. The research results show that: (1) the analytical methods of cross-sectional properties of unbonded flexible risers are solved based on ideal assumptions, and the computational accuracy needs to be improved. (2) Numerical methods have evolved from equivalent simplified models to models that account for detailed geometric properties. (3) Compared with ordinary steel risers, the unbonded flexible riser is more suitable for deep-sea resource development, and the structure of each layer can be designed according to the requirements of the actual environment.

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Section: Methodsmentioning

confidence: 99%

Section: Development Of Cross-sectional Properties Of An Unbonded Fle...mentioning

confidence: 99%

Review of the Development of an Unbonded Flexible Riser: New Material, Types of Layers, and Cross-Sectional Mechanical Properties

Liu,

Qu,

Chen

et al. 2024

Materials

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“…Because the analysis results are used for classification approval and represent the competitiveness of the shipyard's analysis technology, global ship analysis has gained increasing importance for use in shipyards. The analysis is conducted using a finite element (FE)-based global ship model to consider the complexity of the analysis and various loading conditions (Kim et al, 2005;Park et al, 2007) [4,5]. A global ship FE model (referred to below as ship FE model) implies an FE model of full size, and it consists of the ship structural members and main cargo tank.…”

Section: Introductionmentioning

confidence: 99%

Shear Force and Bending Moment Tuning Algorithm of Shuttle Tanker Model for Global Structural Analysis

Lim,

Han,

Kang

et al. 2023

JMSE

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Global ship analysis is conducted using a finite element model (FE model) for ship design and construction, which involves structural, motion, and vibration analyses. It is crucial to examine the structural safety of the hull and motion response. In the ship FE model used in global ship analysis, weight distribution is employed to adjust the light weight and center of gravity (COG), which are required to perform the analysis. Further, the FE model needs to satisfy the required longitudinal shear force (SF) and bending moment (BM) under the loading conditions of the ship. Moreover, the SF and BM in the ship Trim and Stability data are utilized to perform shear force tuning (SFT) and bending moment tuning (BMT) for the ship FE model. This ensures the ship model exhibits curves of the SF and BM that coincide with those of the ship. The SFT and BMT for the ship FE model are time-consuming and costly. Thus, to address these limitations, we propose an effective and accurate algorithm and program for SFT and BMT. Accordingly, we developed a C#-based algorithm to tune the weight, SF, BM, and COG of the ship FE model to the required target value. Finally, the accuracy of the newly developed algorithm was analyzed and compared by applying it to the shuttle tanker FE model under the ballast and full load conditions. Accuracy was within tolerance in both loading conditions. The average errors of SF and BM were smaller in the ballast condition than in the full load condition, and the errors were smaller at the bow than at the stern.

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Numerical Analysis of Dynamics of Unbonded Flexible Riser Carrying Slug Flows

Zhang,

Wang,

Gao

2024

Mechanisms and Machine Science

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Improvement of the bending behavior of a flexible riser: Part ii – hysteretic modeling of bending stiffness in global dynamic analysis

Cited by 4 publications

References 14 publications

Review of the Development of an Unbonded Flexible Riser: New Material, Types of Layers, and Cross-Sectional Mechanical Properties

Review of the Development of an Unbonded Flexible Riser: New Material, Types of Layers, and Cross-Sectional Mechanical Properties

Shear Force and Bending Moment Tuning Algorithm of Shuttle Tanker Model for Global Structural Analysis

Numerical Analysis of Dynamics of Unbonded Flexible Riser Carrying Slug Flows

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