The Stability Analysis of Tension-Leg Platforms under Marine Environmental Loads via Altering the Connection Angle of Tension Legs

Xu, Xu; Wei, Naying; Yao, Wenjuan

doi:10.3390/w14030283

Cited by 3 publications

(1 citation statement)

References 45 publications

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“…Goupee et al [19] conducted 1:50 scale model experiments on the NREL 5 MW tension-leg floating wind turbine, which determined the free decay characteristics of the tension-leg platform and the dynamic response of the floating platform under different environmental loads, providing a large amount of experimental data for numerical analysis. Xu et al [20] conducted a dynamic response study on the connection angle of a tension leg floating platform under environmental load conditions. The results showed that the improved floating platform effectively reduced the dynamic surge and pitch responses, improving the stability of the tension leg platform.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Behavior of a 10 MW Floating Wind Turbine Concrete Platform under Harsh Conditions

Chen,

Wang,

Zhang

et al. 2024

Mathematics

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To ensure the safe and stable operation of a 10 MW floating wind turbine concrete platform under harsh sea conditions, the fluid–structure coupling theory was used to apply wind, wave, and current loads to a concrete semi-submersible floating platform, and strength analysis was performed to calculate its stress and deformation under environmental loads. Moreover, the safety factor and fatigue life prediction of the platform were also conducted. The results indicated that the incident angles of the environmental loads had a significant impact on motion response in the surge, sway, pitch, and yaw directions. As the incident angles increased, the motion response in the surge and pitch directions gradually decreased, the motion response in the sway direction gradually increased, and the yaw motion response showed a trend of first increasing and then decreasing. In addition, the maximum stress of the floating platform under harsh sea conditions was 12.718 MPa, mainly concentrated at the connection of the middle column and pontoon and the connection of the heave plate and Y-shaped pontoon, which meets the use strength requirements. However, the stress concentration zone exhibited a significantly shorter fatigue life with a magnitude of 106. This implies a higher susceptibility to fatigue damage and the potential occurrence of structural failure. This research holds paramount significance in ensuring the safe and stable operation of floating wind turbine platforms, particularly under harsh sea conditions.

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Section: Introductionmentioning

confidence: 99%

Dynamic Behavior of a 10 MW Floating Wind Turbine Concrete Platform under Harsh Conditions

Chen,

Wang,

Zhang

et al. 2024

Mathematics

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Stability Analysis of a TLP with Inclined Tension Legs under Different Marine Survival Conditions

Wei

Zhang

et al. 2022

JMSE

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To verify that inclined tension legs can improve the stability of the tension leg platform, this paper established the dynamic equation of a tension leg platform (TLP) under marine environmental loads by using the modified Morrison equation considering the influence of ocean currents on wave forces. Additionally, the velocity and acceleration of random wave water particles were simulated via the JONSWAP spectrum. In addition, a three-dimensional model of a tension leg platform with inclined tension legs was established by AQWA, and its dynamic responses under variable survival conditions were compared and analyzed. The results showed that the surge and heave were more sensitive to the sea current, while the pitch was more sensitive to the wind. There is a significant difference in tendon tensions between the atypical TLP with inclined tension legs established in this study and the typical International Ship and Offshore Structures Committee (ISSC) TLP.

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Analytical Framework for Tension Characterization in Submerged Anchor Cables via Nonlinear In-Plane Free Vibrations

Yang,

Wang,

Zheng

et al. 2024

JMSE

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Submerged tensioned anchor cables (STACs) are pivotal components utilized extensively for anchoring and supporting offshore floating structures. Unlike tensioned cables in air, STACs exhibit distinctive nonlinear damping characteristics. Although existing studies on the free vibration response and tension identification of STACs often employ conventional Galerkin and average methods, the effect of the quadratic damping coefficient (QDC) on the vibration frequency remains unquantified. This paper re-examines the effect of bending stiffness on the static equilibrium configuration of STACs, and establishes the in-plane transverse free motion equations considering bending stiffness, sag, and hydrodynamic force. By introducing the bending stiffness influence coefficient and the Irvine parameter, the exact analytical solutions of symmetric and antisymmetric frequencies and modal shapes of STACs are derived. An improved Galerkin method is proposed to discretize the nonlinear free motion equations ensuring the accuracy and applicability of the analytical results. Additionally, this paper presents an analytical solution for the nonlinear free vibration response of the STACs using the improved averaging method, along with improved frequency formulas and tension identification methods considering the QDC. Through a case study, it is demonstrated that the improved methods introduced in this paper offer higher accuracy and wider applicability compared to the conventional approaches. These findings provide theoretical guidance and reference for the precise dynamic analysis, monitoring, and evaluation of marine anchor cable structures.

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The Stability Analysis of Tension-Leg Platforms under Marine Environmental Loads via Altering the Connection Angle of Tension Legs

Cited by 3 publications

References 45 publications

Dynamic Behavior of a 10 MW Floating Wind Turbine Concrete Platform under Harsh Conditions

Dynamic Behavior of a 10 MW Floating Wind Turbine Concrete Platform under Harsh Conditions

Stability Analysis of a TLP with Inclined Tension Legs under Different Marine Survival Conditions

Analytical Framework for Tension Characterization in Submerged Anchor Cables via Nonlinear In-Plane Free Vibrations

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