Hydrodynamic coefficients of the DARPA SUBOFF AFF-8 in rotating arm maneuver - Part Ⅱ: Test results and discussion

Zhao, Bowen; Yun, Yingying; Hu, Fangfang; Sun, Jiyuan; Wu, Dazhuan; Huang, Bin

doi:10.1016/j.oceaneng.2022.113466

Cited by 13 publications

(4 citation statements)

References 25 publications

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“…UUVs are kind of underwater vehicles which can both navigate on the surface and dive underwater (Zhao et al, 2022;Zhao et al, 2023). Due to the operational environment and tactical limitations, conventional powered UUVs sailing near the free surface often need to complete tactical actions such as near surface ventilation, power generation, rescue, missile launch, and periscope depth observation.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic performance and wake study of an UUV sailing near the free surface

Zhang,

Zhao,

Sun

2024

Front. Mar. Sci.

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In this study, the SUBOFF submarine is numerically modelled in order to investigate the hydrodynamic features and effects of submerged navigation near the free surface. At various speeds and depths below the surface, the hydrodynamic behaviors of the SUBOFF submarine are examined. From the CFD results, we can deduce that submergence depth significantly affects total resistance of SUBOFF navigation nearby free surface. Because the Kelvin wake of SUBOFF creates wave-making resistance when approaching the open surface head-on, the fraction of pressure difference resistance becomes dramatically with an increase in Fr. The principle of superposition of the divergent wave system and the transverse wave system gradually reveals the divergent wave system as Fr grows larger. The wave making energy is greater, and the submarine needs more power to overcome the wave making resistance.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic performance and wake study of an UUV sailing near the free surface

Zhang,

Zhao,

Sun

2024

Front. Mar. Sci.

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“…The motion of the ROV is a spatial motion with six degrees of freedom. According to the movement force and moment, the maneuverability mathematical model can be constructed to determine the optimal control rule and control system (Zhao et al, 2022;Zhao et al, 2023). Hydrodynamic coefficients are the coefficients of ROV motion equation.…”

Section: Open Accessmentioning

confidence: 99%

“…The following hydrodynamic coefficients are unitless, and their unitless guidelines are shown in Table 3. By using the dimensionless rule outlined in Table 3, the dimensionless model of the ROV may be derived by applying the dimensionless hydrodynamic coefficients (Zhao et al, 2022;Zhao et al, 2023), as shown in .…”

Section: S(l)mentioning

confidence: 99%

Numerical simulation of hydrodynamics of ocean-observation-used remotely operated vehicle

Zhang,

Zhao,

Zhang

et al. 2024

Front. Mar. Sci.

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Remotely operated vehicle is the most widely used underwater robot and can work safely and steadily in complex environments compared to autonomous underwater vehicle and other types. It has obvious advantages in operation time and plays a significant function in marine engineering equipment. Hydrodynamic coefficients are the coefficients of ROV motion equation. In order to simulate the motion and predict the performance of a ROV, the hydrodynamic coefficients must be determined first. The motion mathematical model of remotely operated vehicles is also established, and the hydrodynamic dynamics of the vehicles are simulated using the finite volume method by combining overset mesh technology and governing equations. Finally, a simulation and verification of the standard model SUBOFF model and the calculation process’s dependability are also conducted. The primary hydrodynamic coefficients of the ROV were derived through the simulation data fitting process. The results showed that the ROV’s asymmetry results in an obvious disparity in pressure resistance between the forward and backward sailing, ascending and descending motions, and this disparity becomes significantly greater as the velocity increases. This method confirmed the accuracy of the hydrodynamic simulation computation of the remotely operated vehicle and served as a guide for the maneuverability and design of the vehicle.

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“…In response to the rising demand for energy globally, the focus of offshore oil and gas production is moving from shallow to deep water [1,2]. Several maritime activities need the precise positioning of vessels, underwater vehicles and floating infrastructures [3,4]. The conventional mooring positioning technique is cost-effective; however, it shows poor maneuverability and positioning precision.…”

Section: Introductionmentioning

confidence: 99%

Features of Dynamism Wharf-Cable-Dynamic-Positioning Vessel Rigid-Flexible Coupling Multi-Body System Analysis

Zhang

Zhao

Jiang

et al. 2023

JMSE

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The conventional mooring positioning technique is cost-effective; however, it shows poor maneuverability and positioning precision. In this study, to calculate the mooring tension, mooring cables were discretized into lumped mass models using the lumped mass technique. Dock fender nonlinear response forces were modeled in OrcaFlex using the Link unit. The multi-body system’s entire coupling vibrant time-frequency features have been examined. The effect of the side thrusters on removing the vessel motion carried on by the first-order wave loads has been determined under mooring conditions by comparing the difference in horizontal degree of freedom motion and the mooring line’s mooring tension between dynamic and non-dynamic positioning vessels (DPV). The impact of the wharf-cable and target position on side thrusters and positioning capabilities are analyzed, considering the results of both vessels under identical environmental loads. The results demonstrate that deep evaluation of the target position can greatly improve side thruster performance and ship positioning precision. DP systems are weak to cancel linear wave forces, and the missing ship motions for DP ships may be due to the combined action of the fender, moorings and the selection of a good target position. When the selection of the target position is unreasonable, the size of the pre-tension of the mooring line cannot meet the requirement of absorbing the first-order wave load on the vessel.

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Hydrodynamic coefficients of the DARPA SUBOFF AFF-8 in rotating arm maneuver - Part Ⅱ: Test results and discussion

Cited by 13 publications

References 25 publications

Hydrodynamic performance and wake study of an UUV sailing near the free surface

Hydrodynamic performance and wake study of an UUV sailing near the free surface

Numerical simulation of hydrodynamics of ocean-observation-used remotely operated vehicle

Features of Dynamism Wharf-Cable-Dynamic-Positioning Vessel Rigid-Flexible Coupling Multi-Body System Analysis

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