Dynamic Analysis of Bottom Subsidence of Benthic Lander

Yu, Zhou; Zhang, Chunyue; Chen, Jiawang; Ren, Ziqiang

doi:10.3390/jmse10060824

Cited by 3 publications

(4 citation statements)

References 10 publications

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“…The benthic lander sea trial was conducted in the South China Sea in July 2018 [39,40], and the newest sea trial was conducted in the western Pacific Ocean (location: 134.84 • E, 16.96 • N) in January 2021 (Figure 9). The corresponding video is shown in Supplementary Video S1: sea trial.…”

Section: Sea Trialsmentioning

confidence: 99%

“…A stack influences the hydrodynamic coefficients (as we can see from FigureA5): The corresponding function relationship is calculated by using SOLIDWORKS Flow Simulation. The results are shown in Equations (9) and (10); • T des takes the water depth of 5133 m during the sea trial as the background: The corresponding function is shown in Equation (11); • D sub was tested by a previous study[39,40] for the same benthic lander: The corresponding function is shown in Equation (12…”

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confidence: 99%

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Analysis of the Descent Process and Multi-Objective Optimization Design of a Benthic Lander

Zhang

Dong

Shao

2023

JMSE

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The growing need for deep-sea biological research and environmental monitoring has expanded the demand for benthic landers. Compared with remotely operated vehicles (ROVs) and autonomous underwater vehicles (AUVs), benthic landers can reduce overall operation cost and also possess longer endurance. Configuring a suitable descent velocity is important for benthic lander designs, helping them avoid retrieval failure and improve sea trial efficiencies. In this study, an effective scheme for the configuration and optimization of a self-developed benthic lander was outlined. First, the structural characteristics of the benthic lander were analyzed, and then a dynamic model was established. Second, the hydrodynamic coefficients of the benthic lander during its descent process were calculated using computational fluid dynamics (CFD) methods. Third, the MATLAB Simulink simulation environment was used to solve the dynamic model, and then the multi-objective optimization algorithm was introduced for the optimization design. Finally, the model was validated based on sea trial data, which demonstrated that the designed configuration and optimization scheme were correct and efficient. Collectively, this work provides a useful reference for the rational configuration and practical application of benthic landers.

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Section: Sea Trialsmentioning

confidence: 99%

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confidence: 99%

Analysis of the Descent Process and Multi-Objective Optimization Design of a Benthic Lander

Zhang

Dong

Shao

2023

JMSE

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“…The lander then uses buoyancy to float to the water's surface (Yu et al, 2017). After that, the lander is found by GPS or radio beacon (Yu et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

“…All of the aforementioned landers have triangle-or quadrilateral-shaped frames, and their bottom legs are all attached with circular footpads. Their thinness makes the round foot pads prone to settling in the silt, making floating the frame more challenging (Yu et al, 2022). The lander's deployment cannot be guaranteed due to the triangular or quadrilateral frame, making the lander readily capsize while bottoming out.…”

Section: Introductionmentioning

confidence: 99%

Development and application of a 6000-meter double decelerating lander

et al. 2023

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The deep-sea lander is an important equipment for in-situ detection and monitoring. It is of great significance to understand the benthic boundary layer’s physical, chemical, and ecological environment. A 6000-meter double decelerating lander was created to meet the deployment requirements of underwater detection and monitoring, allowing for long-term in-situ monitoring of several benthic boundary layer components. Protection of the installed ocean bottom seismometer (OBS) is required due to the lander’s and OBS’s different impact resistances. The double decelerating unit enables the OBS to avoid colliding with the seabed when the lander lands and then collides with the seabed at a slow speed rather than the speed at which the lander falls, which is intended to safeguard OBS from damage. To ensure a safe deployment, the lander’s static analysis and simulation were performed using ANSYS, and the motion characteristics of the application process were derived. Numerous data have been obtained after the lander’s successful application in the South China Sea. The lander provides an investigation approach for marine science and geochemistry, complementing a technical approach to marine environmental investigations.

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The Subsea Micro-Drilling Vehicle’s Dynamic Analysis during Landing

2023

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Whether the subsea micro-drilling vehicle (SMDV) can perform its subsequent operations safely depends on the quality of the landing procedure. RecurDyn creates the SMDV dynamic model for this study. A model of the interaction between the SMDV and deep-sea sediment is built, and a simulation of the SMDV falling on the sea’s sediment substrate is developed. The water resistance is applied to the model by equivalent height replacement, and the in-situ soil data is measured with a triaxial undrained unconsolidated (UU) compression test and a load-sinkage experiment. When the landing surface is a flat sediment substrate, the release height is 5 m, the sinkage amount is 347 mm, and the center of mass’s impact acceleration is less than seven gravitational accelerations. Three states can occur when the vehicle lands on a sloped surface: stability, slip, and overturning. The risk of slipping and overturning is the least when the vehicle is landing on the ground in the forward direction, and the risk is equal when it lands on the ground in the backward and sideways directions. The ultimate overturning angle drops, and the final slip angle remains relatively constant as the vehicle’s release height increases. Our findings offer a theoretical foundation for the SMDV’s safe landing and the scientific formulation of rational release intervals.

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Dynamic Analysis of Bottom Subsidence of Benthic Lander

Cited by 3 publications

References 10 publications

Analysis of the Descent Process and Multi-Objective Optimization Design of a Benthic Lander

Analysis of the Descent Process and Multi-Objective Optimization Design of a Benthic Lander

Development and application of a 6000-meter double decelerating lander

The Subsea Micro-Drilling Vehicle’s Dynamic Analysis during Landing

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