Results 11 to 20 of about 411,249 (239)

Comparative Study on Alternative Umbilical Cable Configurations for Deep-Sea Mining System

Journal of Marine Science and Engineering
The umbilical cable plays a critical role in deep-sea mining systems by connecting the surface support vessel to the mining vehicle. If the spatial configuration of the umbilical cable is unsuitable for mining vehicle operations, it may experience ...
Wen Shen, Zhenqin Yuan, Shuqing Wang, Lei Li, Xinrui Yang, Jiancheng Liu, Chaojun Huang, Shipeng Wang, Fengluo Chen   +8 more
doaj   +2 more sources

A Hybrid Gaussian Process Framework for Rapid Prediction of Umbilical Cable Mechanics in Deep-Sea Mining

Journal of Marine Science and Engineering
The umbilical cable is an important component of the deep-sea mining system, serving as the sole connection between the surface support vessel and the seabed mining system.
Zhihao Yu, Chaojun Huang, Shuqing Wang, Jiancheng Liu, Yuankun Sun, Lei Li, Wencheng Liu, Liwei Yu, Yuanhe Li   +8 more
doaj   +2 more sources

AWUCD-Net: The Armored Wire Umbilical Cable Surface Defect Detection Algorithm Based on Improved YOLOv7

IEEE Access
When armored wire umbilicals are used for launching and recovering the seafloor drill, they need to be detected for defects to prevent accidents. Existing wire rope non-destructive detection methods are susceptible to interference, low efficiency, high ...
Du Chen, Yongping Jin
doaj   +2 more sources

Influence of ROV umbilical on power quality when supplying electrical loads [PDF]

, 2005
The paper investigates the effects of a 3 km electrical umbilical cable on power transmission for an "island" supply onboard an all/more electric 'work-class' remote operated vehicle (ROV).
Bingham, Chris, Snary, P, Stone, D A
core   +1 more source

Variable-Length Cable Dynamics of Payout and Reel-in With a Vertically Tethered Underwater Drill Rig

IEEE Access, 2020
A new dynamic model of the variable-length cable used in a vertically tethered underwater drill rig is presented in this paper, which also includes the dynamics of its fixed-length counterpart.
Weicai Quan, Qingqing Chang
doaj   +1 more source

Optical calibration hardware for the Sudbury Neutrino Observatory [PDF]

, 2005
The optical properties of the Sudbury Neutrino Observatory (SNO) heavy water Cherenkov neutrino detector are measured in situ using a light diffusing sphere ("laserball").
A.L. Hallin, B.A. Moffat, C.A.W. Hearns, D.R. Grant, Dragowsky, F.A. Duncan, J. Maneira, K. Graham, P. Skensved, Poon, R.J. Ford, Tagg   +11 more
core   +3 more sources

Simulation Analysis of Passive Heave Compensation Device for Heavy-duty Underwater Robot

Kongzhi Yu Xinxi Jishu, 2023
At present, the simulation model of heave compensation device is usually highly complex, which is not conductive for intuitive understanding of its dynamic characteristics and performance mechanism.
ZHU Yinggu, ZHANG Dinghua, TU Shaoping, ZHANG Chunlin, XIANG Liyang   +4 more
doaj   +3 more sources

Influence of Bending Stiffness on Snap Loads in Marine Cables: A Study Using a High-Order Discontinuous Galerkin Method

Journal of Marine Science and Engineering, 2020
Marine cables are primarily designed to support axial loads. The effect of bending stiffness on the cable response is therefore often neglected in numerical analysis.
Johannes Palm, Claes Eskilsson
doaj   +1 more source

Disturbance Observer-Based Double-Loop Sliding-Mode Control for Trajectory Tracking of Work-Class ROVs

Journal of Marine Science and Engineering, 2022
The open-frame structure of work-class ROVs results in significant model uncertainties, and its motion is strongly disturbed by the umbilical cable. To address these problems, this article developed a nonlinear disturbance observer-based super-twisting ...
Bolun Huang, Qi Yang
doaj   +1 more source

A Nonlinear Observer for Remotely Operated Vehicles with Cable Effect in Ocean Currents

Applied Sciences, 2018
A nonlinear observer for a remotely operated vehicle (ROV) is investigated, and a four-degree-of-freedom nonlinear sliding state observer is designed in this study.
Xiang Li, Min Zhao, Tong Ge
doaj   +1 more source