Results 21 to 30 of about 7,069 (230)

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

Integrated Control Scheme for an Improved Disturbance-Free Payload Spacecraft

Aerospace, 2022
For a novel disturbance-free payload (DFP) spacecraft, it is difficult to isolate the low-frequency disturbances owing to the umbilical cables, which decreases the pointing accuracy and stability of the payload.
Ting Jin, Guohua Kang, Jian Cai, Shaoxia Jia, Jinghua Yang, Xinghua Zhang, Zhenhua Zhang, Long Li, Fangfang Liu   +8 more
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

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

Crevice Corrosion Study of SAF 3207 HD in 6% FeCl3 Solution using Polarization, Weight Loss, and Electrochemical Impedance Spectroscopy Methods

International Journal of Technology, 2016
Hyperduplex Stainless Steel 3207 (SAF 3207 HD) is one of the materials used in the oil and gas industry, especially for umbilical, which is a system to connect cables or instrumental setups between control platforms and wellhead station.
Rini Riastuti, Mega Herawati Arifiana Amanah Notonegoro, Adam Hidana Yudo Saputro   +2 more
doaj   +1 more source

O método da decomposição de Adomian aplicado à interação fluido-estrutura de um cabo

Vetor, 2012
Neste trabalho investiga-se a interação fluido-estrutura de um cabo submerso em um fluido. Esta investigação será feita através do acoplamento entre a modelagem da dinâmica do cabo com o movimento do fluido.
Adriana E. L. Pereira, Sebastião Cícero de Pinheiro Gomes, Álvaro L. de Bortoli   +2 more
doaj   +4 more sources

Automatic Filling Optimization Design of Filler Bodies in Umbilical Cross-Section Based on Quasi-Physical Algorithm

Shanghai Jiaotong Daxue xuebao
As a key component in the subsea production system for oil and gas exploitation, a marine umbilical consists of optical cables, electrical cables, steel tubes, and filler bodies.
YIN Xu, CAO Donghui, TIAN Geng, YANG Zhixun, FAN Zhirui, WANG Gang, LU Yucheng, WANG Hui
doaj   +1 more source

Control system of ROV for underwater safety inspection and operation

Zhongguo Jianchuan Yanjiu, 2018
[Objectives] In order to achieve safety inspections for surface attachments on hulls, dams and underwater steel structures according to the requirements of removing attachments,a new Remotely Operated Vehicle(ROV) equipped with cables for underwater ...
ZHANG Guangyi, ZENG Qingjun, DAI Xiaoqiang, ZHU Chunlei, LING Hongjie   +4 more
doaj   +1 more source

Conceptualization and Experimental Verification of a 50 kW 600 V/4 kV/600 V DC Power Supply System for Ultra-Deep-Sea HyDrones

IEEE Access
Remotely operated underwater vehicles (ROVs) are crucially important in deep-sea exploration. Today, ROVs are typically supplied from a surface vessel via a medium-voltage (MV) 50 Hz/60 Hz ac umbilical.
David Menzi, Bhagyalakshmi Kakarla, Alexandre Capaul, Marcel Frei, Igor Dorrestijn, Johannes Singer, Johann W. Kolar, Jonas Huber   +7 more
doaj   +1 more source

Fluid Forces Control Structural Remodeling of Blind‐Ended Lymphatic Microvessels

Advanced Healthcare Materials, EarlyView.
Using innovative microfluidic biofabrication with fluid mechanical insights, we recapitulated the blind‐ended microanatomy and physiological drainage properties of capillary lymphatics. Our results reveal the interrelationship between intra‐ and extraluminal regions of lymphatic vessels due to flow‐induced sprouting and morphological changes that ...
Jacob C. Holter, Shashwat S. Agarwal, Joseph W. Tinapple, Joseph M. Barlage, Travis H. Jones, Jonathan W. Song   +5 more
wiley   +1 more source