Motion characteristics of novel floating foundation for offshore wind turbine

Li, Jiawen; Tang, Yougang; Wang, Bin

doi:10.1007/s12209-016-2578-1

Cited by 6 publications

(17 citation statements)

References 4 publications

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“…Although the relevant published data is not many so far, fortunately, we found that Yan et al (2021) [26] recently reported their experimental data which was therefore chosen in the numerical validations. In addition to the data in [26], more experimental data of their research work (obtained from the master dissertation [32]) was also employed in this work, which includes not only the stable towing stage but also the initial towing process.…”

Section: Resultsmentioning

confidence: 99%

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Numerical simulations of towing a jacket foundation with triple buckets

Tan

Liu

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Offshore wind energy is developing fast as a promising renewable energy resource that can be helpful in achieving the global net-zero emissions goal. In recent years, offshore wind turbine projects have gradually moved towards far-offshore sea areas, where massive jacket foundations with suction buckets are suitable options. To reduce transportation costs, the wet-towing method is usually favourable since the required buoyancy of the foundation can be provided by the air cushions in the suction buckets. This engineering background brings us a research topic that involves towing and air cushions in waves. This study considers the towing problem of a jacket foundation with triple suction buckets. First, numerical analysis in the frequency domain is conducted using WAMIT®. In particular, the NEWMODES subroutine is extended to consider three separate motion modes in the buckets. Numerical predictions of the natural period show satisfactory agreement with the available experimental data in the literature. Moreover, a time-domain numerical model is developed to simulate towing of the jacket foundation in regular waves based on the potential flow theory. The time-domain model numerically solves the towing force in regular waves, the body motions and the air pressures in the buckets. The simulation results generally agree well with the published experimental data. Besides, the present simulation results suggest that the transit towing force and the forward speed of towed triple-bucket jacket may be considerable in the initial towing stage.

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Section: Resultsmentioning

confidence: 99%

“…The mass and restoring matrices can be determined according to the method of [12]. The motion equation is numerically solved by a developed program code based on fourth-order Runge-Kutta method 2021) [30][31]. This in-house code was written using Fortran language.…”

Section: Time-domain Simulation Modelmentioning

confidence: 99%

Numerical simulations of towing a jacket foundation with triple buckets

Tan

Liu

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…As done in (Seed et al, 1983;Li, 2010), loading cycle N = 20 was also employed for assessing the earthquake-induced liquefaction in this study. Then, substitute ( 9) and N = 20 into (11), obtain…”

Section: Prediction Of Critical Anti-liquefaction Strengthmentioning

confidence: 99%

“…This method calculates the critical liquefaction stress amplitude ratio and related anti-liquefaction capability of soil samples based on triaxial test results. For simplicity, it assumes that the critical liquefaction stress amplitude ratio is a constant in the whole seabed region of interest (Li, 2010;Liu and Wang, 2017). However, this is not true in real life because it will change with burial depth (Geng, 2021;Huang, 2022).…”

Section: Introductionmentioning

confidence: 99%

Study for predicting the earthquake-induced liquefaction around the monopile foundation of offshore wind turbines

et al. 2023

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“…Under maneuvering flight conditions some experts used Jeffcott rotor as a model to analyze the vibration characteristics 16,17 ; Zhu and Chen 18,19 established a unified dynamic model which can be used to analyze the vibration characteristics of multi-disk rotor system in any maneuver. Li 20,21 established the dynamic model of dual-rotor system under the condition of maneuvering flight, and considered bearing coupling effect and gyro moment in the model, and also analyzed the dynamic characteristics of the rotor in jumping and rolling states. Chen 22 established the dynamic model of dual-rotor system in complex maneuvering flight state, and analyzed the influence of stability, vibration jump phenomenon and maneuvering load on the main resonance characteristics in maneuvering flight state.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamics of flexible diaphragm coupling’s rotor system during maneuvering flight

Ding

Zhao

et al. 2022

The Journal of Strain Analysis for Engineering Design

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In this paper, the flexible multi-diaphragm coupling which is used as flexible power transmission shaft of the aeroengine accessory is taken as the research object, and the coupling stiffness matrix and axial nonlinear stiffness of the diaphragms are considered in the coupling rotor system. On this basis, in order to consider the influence of aircraft maneuvering load, in non-inertial system the bending-pendular-axial coupled differential equations of flexible diaphragm coupling were established by Lagrange method. The modal characteristics of the flexible diaphragm coupling were analyzed and compared with the finite element solutions, and the correctness of model is verified. Runge-Kutta method is used to solve and analyze the influence of different maneuvering flight conditions on the vibration characteristics of the flexible diaphragm coupling. The research indicates that the coupling between diaphragm’s axial and radial stiffness leads to the right shift of resonant region, the increase of resonance peak value, and the nonlinear characteristics of amplitude-frequency curve such as jump and multi-value. In the non-inertial system, only the installation distance a of the flexible diaphragm coupling along the wingspan leads to the increase of the axial deformation offset of the flexible diaphragm coupling in the rolling flight state. The increase of climbing or diving angular velocity makes the flexible diaphragm coupling’s vibration changes from single period to multi-period, bifurcation or chaos state; With the increase of diving angular velocity and rolling angular velocity, the axial critical speed gradually increases; Each flight condition not only affects the vibration characteristics, but also causes the axial, radial and angular deformation of the flexible diaphragm coupling to a certain extent. This study provided a theoretical basis and method for the design and analysis of diaphragm coupling.

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Motion characteristics of novel floating foundation for offshore wind turbine

Cited by 6 publications

References 4 publications

Numerical simulations of towing a jacket foundation with triple buckets

Numerical simulations of towing a jacket foundation with triple buckets

Study for predicting the earthquake-induced liquefaction around the monopile foundation of offshore wind turbines

Nonlinear dynamics of flexible diaphragm coupling’s rotor system during maneuvering flight

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