Dynamic Responses of the Floatover System with Nonstationary Mating Processes: An Experimental Study DOI

Xukai Fang,

X. Li,

Rongze Wang

и другие.

Опубликована: Янв. 1, 2023

Floatover method has been widely applied in the installation of offshore platforms, which advantages high efficiency, economy, and large lifting capacity. Few studies could numerically experimentally simulate continuous load transfer process shows significant nonstationary characteristics. This paper conducts experimental research on mating floatover system. The ballasting system based control logic feedback adjustment is developed to adjust inertia properties vessel, validation tests are conducted verify feasibility reliability buffer devices designed carefully nonlinear stiffnesses elastic cushion. stationary model for 0% 100% stages established tested tests, dynamic responses analyzed by using statistical spectral methods respectively. Stationary indicate that characteristics distribution values LMU (Leg Mating Unit) loads transverse symmetric positions similar. segmented according physical process, time-frequency spectrum piecewise statistics diagram find critical stage.

Язык: Английский

A fully coupled time domain model capturing nonlinear dynamics of float-over deck installation DOI
Mingsheng Chen,

Meiyan Zou,

Ling Zhu

и другие.

Ocean Engineering, Год журнала: 2024, Номер 293, С. 116721 - 116721

Опубликована: Янв. 18, 2024

Язык: Английский

Процитировано

28

Numerical validations and investigation of a semi-submersible floating offshore wind turbine platform interacting with ocean waves using an SPH framework DOI Creative Commons
Bonaventura Tagliafierro, Madjid Karimirad, Corrado Altomare

и другие.

Applied Ocean Research, Год журнала: 2023, Номер 141, С. 103757 - 103757

Опубликована: Окт. 19, 2023

In this work, we propose numerical validations of the DeepCwind semi-submersible floating platform configuration for a single horizontal axis wind turbine using data from two experimental testing investigations. A Smoothed Particle Hydrodynamics solver is employed to estimate fluid induced loads, whereas mooring connections are handled via an external library. The first validation setup based on offshore concept moored with system taut-lines and tested free-decay surge heave motion (OC6-Phase Ia). damping evaluation yields fair estimation behavior, much more dissipation experienced surge. second features full hydrodynamic characterization frequency-related load patterns by three different sea-state representations (mono-, bi-chromatic, irregular waves) Ib). model accurately matches whole spectrum investigated wave components, perfectly capturing non-linear behavior shown considered patterns. This work concludes systematic study response, tension, pressure vorticity, suggesting that: steepness criterion alone cannot identify most restrictive case; waves spectral characteristics close resonance period lead higher tensions in systems, maximum fluid-induced loads hull decoupled displacement peaks, showing average reduction 30% respect maxima; very steep maximize likelihood overtopping slamming resulting locally overpressure free-board up 100% than expected similar heights milder profiles. input these last tests released sake reproduction.

Язык: Английский

Процитировано

25

Wave feedforward control for dynamic positioning vessel under swell-dominated floatover condition: A numerical and experimental study DOI Creative Commons

B. Wang,

Xiaoxian Guo, Xin Li

и другие.

Applied Ocean Research, Год журнала: 2025, Номер 154, С. 104396 - 104396

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

2

Numerical modelling of a catamaran float-over deck installation for a spar platform with complex hydrodynamic interactions and mechanical couplings DOI
Mingsheng Chen, Mingjun Ouyang,

Tingqiu Li

и другие.

Ocean Engineering, Год журнала: 2023, Номер 287, С. 115905 - 115905

Опубликована: Окт. 6, 2023

Язык: Английский

Процитировано

21

Development of a coupled time-domain model for complexly moored multi-body system with application in catamaran float-over deck installation DOI

Meiyan Zou,

Chen Chen, Mingsheng Chen

и другие.

Marine Structures, Год журнала: 2025, Номер 103, С. 103849 - 103849

Опубликована: Май 19, 2025

Язык: Английский

Процитировано

1

Transverse vortex-induced vibration of two elliptic cylinders in tandem: Effects of spacing DOI
Mehdi Badri Ghomizad, Masashi Yamakawa

Physics of Fluids, Год журнала: 2023, Номер 35(11)

Опубликована: Ноя. 1, 2023

Renewable energy converters, such as bio-inspired fluttering foils, are gaining popularity due to their eco-friendly properties. However, the system with multiple objects has received scant attention. Here, we analyze how spacing influences transverse (one-degree-of-freedom) vortex-induced vibration of two tandem identical elliptic cylinders at a constant Reynolds number by employing wide range reduced velocities (Ur∈[2,14]) and space ratios (L∗∈[2,6]). The incompressible Navier–Stokes equations solved using overset mesh method in OpenFOAM® library. findings indicate that wake structure goes through eight distinct modes, well gap flow patterns (reattachment co-shedding). Vibrational responses, force parameters, determine three configurations. At small (L∗=2), upstream cylinder (UC) traditional lock-in (the frequency ratio fy/fn≃0.95–1.05) velocity (Ur≃7), downstream (DC) narrow region around Ur≃9. UC soft-lock-in synchronization fy/fn≃1.15) high (Ur≃8–10). vibrations both cylinders, but especially DC, reach relatively amplitudes. moderate (L∗=3), bears zone analogous single same mass ratio, while DC shows vast (Ur≃8–14). large (L∗=4, 5, 6), amplitude is often larger than when it region. exhibits peak Ur = 7 wake-galloping for > 12.

Язык: Английский

Процитировано

12

Effects of ballast transfer on modeling and dynamic responses of a 15MW semi-submersible floating wind turbine DOI

Changen Li,

Peng Chen, Shi Deng

и другие.

Ocean Engineering, Год журнала: 2024, Номер 302, С. 117581 - 117581

Опубликована: Март 27, 2024

Язык: Английский

Процитировано

3

Hydrodynamic Performance and Motion Prediction Before Twin-Barge Float-Over Installation of Offshore Wind Turbines DOI Creative Commons
Mengyang Zhao, Xiang Yuan Zheng, Sheng Zhang

и другие.

Journal of Marine Science and Engineering, Год журнала: 2025, Номер 13(5), С. 995 - 995

Опубликована: Май 21, 2025

In recent years, the twin-barge float-over method has been widely used in offshore installations. This paper conducts numerical simulation and experimental research on installation of wind turbines (TBFOI-OWTs), focusing primarily seakeeping performance, also explores influence gap distance hydrodynamic behavior TBFOI-OWTs. Model tests are conducted ocean basin at Tsinghua Shenzhen International Graduate School. A physical model with a scale ratio 1:50 is designed fabricated, comprising two barges, truss carriage frame, small turbines, spread catenary mooring system. series tests, including free decay regular wave random carried out to investigate hydrodynamics The results good agreement, thereby validating accuracy method. motion RAOs TBFOI-OWTs small, demonstrating their performance. Compared situation, surge sway motions waves have greater ranges amplitudes. reveals that analysis cannot depend only, more importantly, nature realistic less favorable for responses controlled by motions’ natural frequencies incident frequency. It revealed between barges significant beam seas. Within certain range periods (10.00 s < T 15.00 s), increasing reduces RAO roll due energy dissipated damping pool barge gap. For safety within an operating window, it meaningful but challenging accurate predictions forthcoming motions. this, this study employs Whale Optimization Algorithm (WOA) optimize Long Short-Term Memory (LSTM) neural network. Both stepwise iterative direct multi-step LSTM achieve high predicted heave study, some extent, affirms feasibility power industry provides useful scheme short-term

Язык: Английский

Процитировано

0

Dynamic responses of a twin-DP-barge float-over installation system with flexible connections DOI Creative Commons

Rongze Wang,

Quan Shi, Xinliang Tian

и другие.

Journal of Ocean Engineering and Science, Год журнала: 2024, Номер unknown

Опубликована: Июнь 1, 2024

The twin-barge float-over technique, incorporating a dynamic positioning (DP) system, has been increasingly utilized to enhance the installation capacity and efficiency of offshore platforms. But DP system is not fully considered during design stage at present. This study investigates responses integrating flexible connections system. A numerical model developed combined with model-scale experiments analyze characteristics findings reveal significant influence on coupled leading harsh oscillations in roll heave directions. To effectively address this oscillation, method eigenmodes analysis filter adjusting proposed. robustness verified through sensitivity analysis, further investigation conducted motion response under varying environmental conditions. proposed paper are also applicable various multi-vessel cooperative transportation scenarios.

Язык: Английский

Процитировано

2

Dynamic responses of the floatover system with nonstationary mating processes: An experimental study DOI

Xukai Fang,

X. Li,

Rongze Wang

и другие.

Ocean Engineering, Год журнала: 2024, Номер 305, С. 117958 - 117958

Опубликована: Апрель 24, 2024

Язык: Английский

Процитировано

1