A constant parameter time domain model for dynamic modelling of multi-body system with strong hydrodynamic interactions

Zou, Meiyan; Chen, Mingsheng; Zhu, Ling; Lin, Li; Zhao, Wenhua

doi:10.1016/j.oceaneng.2022.113376

Cited by 61 publications

(16 citation statements)

References 30 publications

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“…The use of the damping lid method to correct the over-predicted dynamic response of the floating body in the frequency domain of AQWA has been demonstrated in previous papers to prove its feasibility [14,15,53,54]. The damping factor is taken as 0, 0.025 and 0.05.…”

Section: Hydrodynamics Of the Barge-type Floating Wind Turbinementioning

confidence: 99%

Dynamic Analysis of a Barge-Type Floating Wind Turbine Subjected to Failure of the Mooring System

Chen,

Yang,

Sun

et al. 2024

JMSE

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Evidence points to increasing the development of floating wind turbines to unlock the full potential of worldwide wind-energy generation. Barge-type floating wind turbines are of interest because of their shallow draft, structural simplicity, and moonpool-damping effect. Based on the BEM potential flow method, this study uses ANSYS-AQWA software to create a floating-barge moonpool platform model equipped with an OC5 NREL 5 MW wind turbine, to study the effect of the damping lid method on the resonance of the moonpool gap water, the wind–wave coupling effect, and the dynamic response of the FOWT and mooring system after single-line and double-line failure. The results show that the damping lid method, based on the potential flow theory, can effectively correct the effect caused by the lack of viscosity; the effect of a single breakage of upwind mooring lines on the motion is mainly in the sway and yaw modes, and after mooring line 8 breaks, the maximum tension of the adjacent mooring line increases by 2.91 times compared to the intact condition, which is 58.9% of the minimum breaking strength; and the breakage of two mooring lines located at one corner leads to a surge drift of up to 436.7 m and a cascading failure phenomenon.

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Section: Hydrodynamics Of the Barge-type Floating Wind Turbinementioning

confidence: 99%

Dynamic Analysis of a Barge-Type Floating Wind Turbine Subjected to Failure of the Mooring System

Chen,

Yang,

Sun

et al. 2024

JMSE

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“…The hydrodynamic force, wave force and other factors between the ships are of relatively smaller concern (Pawar et al, 2018;Sakakibara et al, 2018;Van Den Van and Van Loon, 2018). The ship moored near the shiplock may experience complex hydrodynamic interaction between the ships and the adjacent shiplock structure, an efficient and accurate time-domain model was developed to deal with nonlinear effects by Zou et al (2023), which are difficult to solve in frequency-domain models, such as mooring force and operation and installation loads. To reveal the dynamic characteristics of the floating systems, the coupled hydrodynamic-structural responses were investigated by Chen et al (2023), using a frequency-time-domain numerical model with viscous correction.…”

Section: Figurementioning

confidence: 99%

Structural load monitoring of floating mooring column and its application on optimal regulation for water conveyance system operation of sea shiplock

Qi¹,

Li²,

Jiang³

et al. 2023

Front. Energy Res.

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Due to the sea water intrusion and the development trend of using large-scale ships, more stringent requirements are put forward for the safety of water delivery process and the mooring equipment operation for the sea shiplock. The maximum loads for the mooring equipment of sea shiplock, i.e., floating mooring column (FMC), are generally occurred at the end of water delivery. The superimposed effect of turbulent flow and marine corrosive environment can accelerate the failure of the floating mooring column structure for the sea shiplock, which leads to the safety incidents, including the structural damage of FMC and the breakage of mooring lines for the ship, etc. The safety of the FMC is mostly influenced by three factors, including the ship’s tonnage, the water flow environment of the locked room, and the lock operation technologies; among these, the water flow environment can be considered the most significant. In practice, because the mooring load of an FMC due to water delivery from the shiplock is very complicated, there is currently no mature approach to condition monitoring. This investigation aims to address a large sea shiplock, and the optimal regulation approach for water delivery of shiplock is established based on a load monitoring methodology for FMCs. The detection accuracy of the FMC mooring loads is controlled by simulation verification with errors less than 10%. During the optimized water delivery process, the exerted loads on the FMCs are noticeably reduced to be lower than the maximum design rating. The innovative approach is essentially based on an inversion calculation of the load response model for obtaining the mooring loads of FMCs, with the monitored load results used to regulate and optimize the water delivery process of the shiplocks. The research results can fill a part of the research gap of FMC mooring load condition monitoring method in shiplock water delivery, and provide technical support for the safety of shiplock water delivery process and mooring equipment operation.

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“…(11) where M = m + m a . A point absorber is often modeled using the Cummins equation shown in Equation (12) [8,38,39].…”

Section: Radiation Forcementioning

confidence: 99%

Effect of the Dynamic Froude–Krylov Force on Energy Extraction from a Point Absorber Wave Energy Converter with an Hourglass-Shaped Buoy

et al. 2023

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Point absorber wave energy converter (WEC) control strategies often require accurate models for maximum energy extraction. While linear models are suitable for small motions, the focus is on the nonlinear model of an hour-glass shaped buoy undergoing large vertical displacements. Closed-form expressions for the static and dynamic Froude–Krylov forces are developed. It is shown that, in general, the dynamic and static forces are of similar magnitude, which is not the case for a spherical buoy. While the dynamic force reduces the amplitude of the net buoy force, its shape predicts a larger buoy response than if neglected, causing the nonlinear terms to have an even more significant effect. An input-state feedback linearizing controller is developed to show how the nonlinear model can be used in a control law. A 2.5 m buoy example is simulated to illustrate the approach of tracking an arbitrary displacement reference. For the case considered, the extracted power is 30% larger when the nonlinear dynamic FK force is used in the control law. The hourglass buoy is also compared to a spherical buoy to illustrate differences in their response to regular waves and energy extraction when using the same control laws. A spherical buoy diameter of 7.5 m was required to obtain the same power output as a 5 m tall hourglass buoy. A power-force-amplitude (PFA) metric is introduced to compare energy extraction performance and power take-off requirements. The hourglass buoy’s PFA was 13% larger than the spherical buoy implying that it can produce similar power but with less control effort.

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A constant parameter time domain model for dynamic modelling of multi-body system with strong hydrodynamic interactions

Cited by 61 publications

References 30 publications

Dynamic Analysis of a Barge-Type Floating Wind Turbine Subjected to Failure of the Mooring System

Dynamic Analysis of a Barge-Type Floating Wind Turbine Subjected to Failure of the Mooring System

Structural load monitoring of floating mooring column and its application on optimal regulation for water conveyance system operation of sea shiplock

Effect of the Dynamic Froude–Krylov Force on Energy Extraction from a Point Absorber Wave Energy Converter with an Hourglass-Shaped Buoy

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