Results 1 to 10 of about 6,817 (174)

Analysis and Calculation of Crosstalk for Twisted Communication Cables in Umbilical Cable

Energies, 2022
An umbilical cable is a compactly integrated cable consisting of electrical power cables, communication (electric signal) cables, and chemical transposition tubes.
Runze Cai, Shiyou Yang
doaj   +2 more sources

Surface Roughness Analysis of Subsea Cables/Umbilicals

Journal of Marine Science and Engineering
Surface roughness is an important factor influencing subsea cable/umbilical–soil interaction. The cable/umbilical goes through several steps before being laid on the seabed, including production, spooling, unspooling, and installation on the seabed. Yet,
Ahmed Reda, Han Eng Low, Mohamed A. Shahin   +2 more
doaj   +2 more sources

Modeling and Control of a Six Degrees of Freedom Maglev Vibration Isolation System [PDF]

Sensors, 2019
The environment in space provides favorable conditions for space missions. However, low frequency vibration poses a great challenge to high sensitivity equipment, resulting in performance degradation of sensitive systems.
Qianqian Wu, Ning Cui, Sifang Zhao, Hongbo Zhang, Bilong Liu   +4 more
doaj   +2 more sources

Flight test results for microgravity active vibration isolation system on-board Chinese Space Station [PDF]

npj Microgravity
The Fluid Physics Research Rack (FPR) is a research platform employed on-board the Chinese Space Station for conducting microgravity fluid physics experiments.
Wei Liu, Yang Gao, Long Zhang, Tianji Zou, Mengxi Yu, Tuo Zheng   +5 more
doaj   +2 more sources

Study Simulation of Umbilical Cable for Underwater Vehicle [PDF]

Bulletin of the Polytechnic Institute of Iași. Machine constructions Section, 2021
Abstract This paper presents a series of analyses regarding the tethered umbilical cable in uniform current cable from the composition of the underwater remotely operated vehicle (ROV). The remotely operated vehicle is used in different undersea operation when it is important to control and determine precisely the disturbance forces ...
Andra-Teodora Nedelcu, Cătălin Faităr, Nicolae Buzbuchi, Liviu Stan   +3 more
openaire   +1 more source

Coordinated Decentralized Control of Dynamic Volt-Var Function in Oil and Gas Platform With Wind Power Generation

IEEE Open Journal of Industry Applications, 2023
The integration of offshore wind energy power system is a solution to reduce carbon emissions in the oil and gas sector. However, the intermittent profile of wind power generation can bring challenges of voltage/frequency fluctuations to the electrical ...
Lorrana F. da Rocha, Danilo I. Brandao, Kassiane de S. Medeiros, Matheus S. Dall'asta, Telles B. Lazzarin   +4 more
doaj   +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

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