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Xiaofeng Zeng, Minghai Xia, Zirong Luo, Jianzhong Shang, Yuze Xu and Qian Yin
Stable, quiet, and efficient propulsion methods are essential for underwater robots to complete their tasks in a complex marine environment. However, with a single propulsion method, such as propeller propulsion and bionic propulsion, it is difficult to ...
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Julian Kimmerl and Moustafa Abdel-Maksoud
Underwater radiated noise is part of the anthropogenic emissions into the environment and as such a pressing problem for the preservation of the marine ecosystem. In order to direct attention to the most relevant noise sources associated with ships it is...
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Yu Wang, Yujie Wang, Yaxin Li and Cheng Ren
This paper proposes a hybrid propulsion-based small underwater robot for robust trajectory tracking control in a harsh and complex underwater environment. The robot is equipped with a Coanda-effect jet thruster and a pair of propeller-based reconfigurabl...
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Nick van der Geest, Lorenzo Garcia, Roy Nates and Alberto Gonzalez-Vazquez
Sea turtles are recognised as one of the ocean?s most remarkable migratory species, accomplishing journeys that cover thousands of kilometres. This fact is even more extraordinary when considering sea turtles consume mostly low-energy foods. The biology ...
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Nachum E. Eisen and Alon Gany
This research focuses on theoretically and experimentally evaluating the performance of a metallized hybrid-propellant, water-breathing ramjet. The aluminum and/or magnesium particles added to a polymeric (polyester) fuel grain are hydro-reactive, using ...
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Daili Zhang, Guang Pan, Yonghui Cao, Qiaogao Huang and Yong Cao
Bionic underwater robots are the intersection of biology and robotics; they have the advantages of propulsion efficiency and maneuverability. A novel vehicle that combines a gliding and flapping propulsion inspired by a manta ray is presented in this art...
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Henrique Fagundes Gasparoto, Olivier Chocron, Mohamed Benbouzid and Pablo Siqueira Meirelles
Manoeuvrability is one of the essential keys in the development of improved autonomous underwater vehicles for challenging missions. In the last years, more researches were dedicated to the development of new hulls shapes and thrusters to assure more man...
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Yeming Lu, Haoran Liu, Xiaofang Wang and Hui Wang
Due to the higher propulsive efficiency, lesser vibration, and better maneuverability, the water jet pump is widely applied to high-speed underwater vehicles. By taking a newly developed water jet pump system as the object, the corresponding underwater v...
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Yukai Li, Yuli Hu, Youguang Guo, Baowei Song and Zhaoyong Mao
Permanent magnet couplings can convert a dynamic seal into a static seal, thereby greatly improving the stability of the underwater propulsion unit. In order to make full use of the tail space and improve the transmitted torque capability, a conical Halb...
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Juan Pablo Orozco-Muñiz, Tomas Salgado-Jimenez and Noe Amir Rodriguez-Olivares
The Variable Buoyancy System (VBS) is a critical device in the operation of underwater gliders that should be properly sized to achieve the required vehicle propulsion; safety within the operating range; and adequate efficiency at the nominal depth ratin...
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Nachum E. Eisen and Alon Gany
This work analyzes and presents theoretical performance of a marine water-breathing ramjet propulsor. A conceptual scheme of the motor is shown, the equation of thrust is presented, and the dependence on cruise velocity and depth are discussed. Different...
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Eun-Young Park and Jungho Choi
Air-independent propulsion systems have improved the performance and decreased the vulnerability of underwater weapon systems. Reforming systems, however, generates large amounts of water and CO2. The recovery or separation of CO2, a residual gas compone...
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Yongcheng Li, Jianxin Hu, Qiuzhuo Zhao, Ziying Pan and Zheng Ma
The propulsive performance of a bio-inspired autonomous underwater glider (AUG) with active twin undulatory wings undergoing undulatory motion was investigated by numerically solving the viscous incompressible Navier?Stokes equations, coupled with the im...
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Yukai Li, Yuli Hu, Baowei Song, Zhaoyong Mao and Wenlong Tian
Permanent magnet couplings (PMCs) are widely used in underwater propulsion because it can solve the deep-sea sealing problem effectively. In this paper, a new type of conical permanent magnet coupling (CPMC) is proposed, which is able to match the tail s...
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Volodymyr Blintsov,Hanna Hrudinina
Pág. 19 - 26
The research of nonlinear hydrodynamic characteristics of the propulsion and steering complex (PSC), which influence the accuracy of the plane trajectory motion of an autonomous underwater vehicle (AUV), is carried out. During the underwater vehicle curv...
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Heejang Moon, Seongjoo Han, Youngjun You and Minchan Kwon
This paper presents an attempt to use the hybrid rocket for marine applications with a 500 N class hybrid motor. A 5-port high density polyethylene (HDPE) fuel grain was used as a test-bed for the preliminary assessment of the underwater boosting device....
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Shuoxin Gu and Shuxiang Guo
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Nick van der Geest, Lorenzo Garcia, Roy Nates and Fraser Borrett
Sea turtles gracefully navigate their marine environments by flapping their pectoral flippers in an elegant routine to produce the required hydrodynamic forces required for locomotion. The propulsion of sea turtles has been shown to occur for approximate...
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Chen-Wei Chen, Zhao-Ye Zhou, Xu-Peng Chen and Xiao-Jing Zhou
Due to the lack of a powerful propulsion device in conventional autonomous underwater gliders (AUGs), their mobility and flexibility are insufficient, thus not being capable of also ensuring the stability of the motion route. Thus, it is necessary to fur...
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Herman D. Haustein, Alon Gany and Ezra Elias
An innovative variant of a multiphase marine ramjet is investigated analytically and experimentally. Pressure liquefied gas (LG) is injected, boiling under superheat conditions in the water stream within the propulsion unit, and serving as an on-board bu...
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