Influence of the internal varying density flow on the vibrations and fatigue damage of a top-tensioned riser undergoing vortex-induced vibrations

Xie, Wude; Xin, Weiyan; Zhang, Hongqiang

doi:10.1016/j.apor.2021.102955

Cited by 9 publications

(4 citation statements)

References 40 publications

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“…The S-N curve, also known as the fatigue or endurance limit curve, provides a relationship between the stress amplitude and the number of cycles to failure. This curve is crucial for assessing the fatigue life of a structure subjected to repeated loading conditions [9][10][11][12].…”

Section: Miner's Cumulative Fatigue Damagementioning

confidence: 99%

Spectral fatigue analysis for legs of wind turbine units

Zhang,

Qian,

Guo

et al. 2024

International Conference on Mechatronic Engineering and Artificial Intelligence (MEAI 2023)

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The analysis of spectral fatigue for wind turbine unit legs in this paper is grounded in dynamic analysis. The influence of weight in key areas, including the main hull, main deck, superstructure, cantilever, drilling floor, and others, is meticulously considered through the incorporation of mass elements. The calculation of Response Amplitude Operators (RAOs) for the legs is carried out using a frequency domain spectral analysis method. Critical fatigue locations are discerned by scrutinizing stress responses under design operating conditions, revealing vulnerabilities near the lower guides, spudcans, waterline, and specific chord and brace positions. The selected chords and braces, along with their respective locations, are visually depicted. Given that fatigue damage primarily results from cyclic load actions, this analysis excludes consideration of non-cyclic loads such as buoyancy and gravity. Additionally, the impact of wind load is not factored in; only fatigue resulting from wave and current loads is computed.

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Section: Miner's Cumulative Fatigue Damagementioning

confidence: 99%

Spectral fatigue analysis for legs of wind turbine units

Zhang,

Qian,

Guo

et al. 2024

International Conference on Mechatronic Engineering and Artificial Intelligence (MEAI 2023)

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“…The static equilibrium states of the riser are calculated by employing the Newton-Raphson iterative method, 25 and the Newmark method is utilized to solve Equation (14) in the time domain. 26…”

Section: Riser Elementmentioning

confidence: 99%

“…Li et al 24 investigated the influence of twophase internal flow on the VIV response of a catenary riser and suggested that the presence of slug flow can significantly affect the VIV response characteristics of SCRs and increase the risk of fatigue. Xie et al 25 indicated that small circular frequency fluctuations in the internal fluid density can significantly affect vibrations of risers, while increases in the mean fluid density or the fluctuation amplitude of the internal varying fluid density result in greater fatigue.…”

Section: Introductionmentioning

confidence: 99%

Fatigue reliability assessment of offshore catenary risers conveying internal slug flow

Liu

Kang

et al. 2023

Quality & Reliability Eng

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This paper proposes a fatigue reliability assessment method of offshore steel catenary risers (SCRs) caused by internal slug flow. Offshore risers subject to slug flow are modeled first by employing a finite element method scheme. Subsequently, a combination of Kriging metamodel and Monte Carlo simulation (MCS) is established to assess the fatigue reliability of SCRs conveying internal slug flow. An explanatory example of a 16-inch SCR is presented to validate the performance of the proposed method and the results indicate that the failure rates of the SCR are significantly affected by the frequency of slug flow. Moreover, the accuracy and feasibility of the present method are validated by a comprehensive comparison with the existing experiments and numerical results. The present method contributes to the design and maintenance of offshore risers with internal slug flow.

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“…The method was used to study the detailed influence of hydrodynamic loads on the axial dynamics of risers under different amplitudes and periods of platform motion and riser configurations [18]. Substantial evidence supports the notion that fatigue damage is a crucial factor in determining the safety of risers [19][20]. Jeong et al studied the effects of slug flow on the dynamic response and fatigue damage of risers, for which they developed a methodology to evaluate the impacts.…”

Section: Introductionmentioning

confidence: 99%

Dynamic behavior of risers under nonlinear oceanic environmental loading

Xu,

Yuan,

Luo

et al. 2023

J. vibroeng.

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The riser system acts as the vital link between the subsea blow-out preventer and the drilling platform. Affected by factors like top tension and marine environmental forces, the riser undergoes deformation and wear, carrying the risk of environmental pollution and financial losses upon failure. Hence, this study examines the riser's dynamic response to marine environmental loading. Initially, the motion differential equation for the riser system under the influence of nonlinear oceanic load is deduced using the principle of minimum potential energy and the variational method for extremum seeking. Subsequently, a nonlinear wave-current load model based on the Morrison equation is established, and the resulting equation is discretized into a finite element model using third-order Hermite interpolation function and the Galerkin weighted residual method. Finally, the dynamic response of the riser is scrutinized employing the Newmark numerical integration method. The study also investigates the impact of both oceanic environmental parameters and drilling parameters on the riser’s dynamic behavior. Comparative analysis of the numerical results reveals that the maximum displacement of the riser occurs at the middle section, whereas the maximum deflection angle is observed at the end of the riser. The periodicity of the deflection angle response is influenced by the position of the riser, showing a trend of decreasing and then increasing from the middle section towards the ends. Notably, the top tension and the velocity of the surface tidal current significantly affect the dynamic behavior of the riser. The findings of this study provide a theoretical foundation for the assessment of riser reliability and the determination of operational parameters.

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Influence of the internal varying density flow on the vibrations and fatigue damage of a top-tensioned riser undergoing vortex-induced vibrations

Cited by 9 publications

References 40 publications

Spectral fatigue analysis for legs of wind turbine units

Spectral fatigue analysis for legs of wind turbine units

Fatigue reliability assessment of offshore catenary risers conveying internal slug flow

Dynamic behavior of risers under nonlinear oceanic environmental loading

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