Results 21 to 30 of about 10,468,359 (216)

Numerical Study of the Effect of Angle and Location of the First and Second Steps on the Performance of Planing Hull and Their Optimization Using the Taguchi Statistical Method

Mathematical Problems in Engineering, Volume 2023, Issue 1, 2023., 2023
Providing steps at the bottom of a high‐speed craft could decrease the resistance and enhance the longitudinal stability by dividing a single pressure hump into several ones and extending the hydrodynamic pressure towards aft of the vessel. In the present paper, the effects of the fore and aft steps’ locations and angles on double‐stepped hulls are ...
Parviz Ghadimi, Sayyed Mahdi Sajedi, Mohammad Sheikholeslami, Aliakbar Ghadimi, Jie Hu   +4 more
wiley   +1 more source

Expediting recovery of autonomous underwater vehicles in dynamic mission environments: A system‐of‐systems challenge for underwater warfare

Journal of Field Robotics, Volume 39, Issue 8, Page 1323-1340, December 2022., 2022
Abstract As autonomous underwater vehicle (AUV) adoption increases, operators demand advanced behaviors from commercial off‐the‐shelf systems. However, new behaviors can often only be deployed operationally once assured. This paper overviews research into expediting recovery to an operator's vessel through a custom homing behavior, demonstrating ...
James Keane, Keith F. Joiner, Sanjeev Arulampalam, Russ Webber   +3 more
wiley   +1 more source

Autonomous hanging tether management and experimentation for an unmanned air‐surface vehicle team

Journal of Field Robotics, Volume 39, Issue 6, Page 869-887, September 2022., 2022
Abstract The mission of an unmanned air vehicle (UAV) tethered to a small unmanned surface vehicle (USV) is considered. As opposed to the majority of existing tethered UAV work, which assumes a taut tether, this paper addresses the challenge of tether management for a slack, hanging tether in a dynamic ocean environment up to sea state 4 on the Douglas
Kurt Talke, Frederick Birchmore, Thomas Bewley   +2 more
wiley   +1 more source

Modal Investigation on a Large‐Scale Containership Model for Hydroelastic Analysis

Shock and Vibration, Volume 2022, Issue 1, 2022., 2022
A 20,000 TEU containership with an overall length of about 400 m is designed as a target ship to investigate ship hydroelastic characteristics in the joint industry project (JIP) of CSSRC‐20,000 TEU. A set of systematic model tests are carried out in the seakeeping wave basin of CSSRC.
Ye Lu, Juan Liu, Bei Teng, Chao Tian, Hailong Si, Qingyun Zhou, Xinyun Ni, Jialong Jiao   +7 more
wiley   +1 more source

Risk Spatial Distribution and Fluctuation Mechanism of Ship Traffic System Based on Catastrophe Control and Intelligent Sensor

Wireless Communications and Mobile Computing, Volume 2022, Issue 1, 2022., 2022
Navigation control system is an important navigation building of inland‐river in China. Because of its special semiclosed structure, when the efficiency of the mutation control system is low, the ship system cannot identify the ship, which may endanger the life safety of the crew and cause water traffic accidents.
Ji Qi, Yuying Yuan, Wei Li, Fangjing Zhang, Yali Li, Deepak Kumar Jain   +5 more
wiley   +1 more source

Numerical simulation of seakeeping performance of a trimaran small waterplane area center hull

Zhongguo Jianchuan Yanjiu, 2020
[Objectives] Compared with trimarans, the trimaran small waterplane area center hull (TriSWACH)has a larger underwater ship and the waterline surface is greatly reduced,therefore,the seakeeping law of ordinary trimaran is not completely applicable to ...
ZHANG Mingxia, LU Pengcheng, WANG Zhihao
doaj   +1 more source

Comparative analysis of seakeeping methods: numerical, software simulation and experimental study

Annals of "Dunărea de Jos" University of Galaţi: Fascicle XI Shipbuilding, 2023
The current study case presents a comprehensive comparison of seakeeping analysis methods, utilizing the seakeeping numerical analysis based on Lewis’s form description of a hull, Ansys Aqwa, and experimental data obtained from the towing tank of the ...
Dumitru Silviu Perijoc, Leonard Domnișoru   +1 more
doaj   +1 more source

Evaluation of Seakeeping Performance of an Light Aircraft Carrier

Journal of the Society of Naval Architects of Korea
Dong-Min Park, Min-Guk Seo, Hyungdo Song, Seok-Kyu Cho, Sa Young Hong   +4 more
openaire   +2 more sources

Discrete Wavelet Transform‐based Approach of Real‐time Wave Filtering for Dynamic Positioning of Marine Vessels

Mathematical Problems in Engineering, Volume 2022, Issue 1, 2022., 2022
The ongoing development of deep‐sea resources has contributed toward the widespread use of dynamic positioning (DP) systems that can operate in arbitrary sea areas without the limitation of operating water depth compared to mooring systems. The second‐order slowly varying forces can be compensated by DP feedback control.
Changde Liu, Yufang Zhang, Min Gu, Longhui Zhang, Yanbin Teng, Zhengfeng Liu, Qiang Sun, Naxin Wei, Asier Ibeas   +8 more
wiley   +1 more source

Improved composite adaptive fault‐tolerant control for dynamic positioning vehicle subject to the dead‐zone nonlinearity

IET Control Theory &Applications, Volume 15, Issue 16, Page 2067-2080, November 2021., 2021
Abstract In order to tackle the marine practical constraints, for example the actuator faults, the dead‐zone input, an improved composite adaptive neural control algorithm is proposed for dynamic positioning vehicles in presence of the unknown external disturbances. In the algorithm, the robust neural damping technique is employed to remodel the system
Guoqing Zhang, Mingqi Yao, Wenjun Zhang, Weidong Zhang   +3 more
wiley   +1 more source