Results 41 to 50 of about 20,808 (340)

Avenues for Underwater Propulsion

Defence Science Journal, 1992
This study reviews thermal propulsion systems related to underwater application, covering the conceptual idea, the technology and the mechanism. Some of the salient features of the stored chemical energy propulsion system (SCEPS) technology and the unconventional engines are discussed.
openaire   +1 more source

A survey and analysis of multiphase electric propulsion motors and associated controllers for driving underwater platforms

Propulsion and Power Research
Propulsion motors are essential for driving underwater platforms, which are designed to explore and exploit marine resources, primarily materials located within oceans and other bodies of water.
Arun Singh, Anita Khosla
doaj   +1 more source

The Analysis of Biomimetic Caudal Fin Propulsion Mechanism with CFD

Applied Bionics and Biomechanics, 2020
In nature, fish not only have extraordinary ability of underwater movement but also have high mobility and flexibility. The low energy consumption and high efficiency of fish propulsive method provide a new idea for the research of bionic underwater ...
Guijie Liu, Shuikuan Liu, Yingchun Xie, Dingxin Leng, Guanghao Li   +4 more
doaj   +1 more source

Field Study on Underwater Noise Emitted by Small Tourist Boats. Comparison Between the Use of Electric and Combustion Motors

Archives of Acoustics, 2023
Small boats, possessing outboard engines, are widely used in tourism and mammal watching within marine protected areas. Noise generated by this type of vessels has the capacity to negatively affect marine fauna, especially marine mammals, which use sound
Alfio YORI
doaj   +1 more source

Comparative Investigation on Hydrodynamic Performance of Pump-Jet Propulsion Designed by Direct and Inverse Design Methods

Mathematics, 2021
Pump-jet propulsion, a new propulsion technology, is primarily designed for underwater vehicles. Because of its concealment and excellent performance, it has been widely used, but due to its confidentiality and complexity, few studies have been published.
Yunkai Zhou, Longyan Wang, Jianping Yuan, Wei Luo, Yanxia Fu, Yang Chen, Zilu Wang, Jian Xu, Rong Lu   +8 more
doaj   +1 more source

A Comparison of Video and Accelerometer Based Approaches Applied to Performance Monitoring in Swimming. [PDF]

, 2009
The aim of this paper is to present a comparison of video- and sensor based studies of swimming performance. The video-based approach is reviewed and contrasted to the newer sensor-based technology, specifically accelerometers based upon Micro-Electro ...
Callaway, Andrew, Cobb, Jonathan E., Jones, Ian   +2 more
core   +1 more source

Swimmer with submerged SiO2/Al/LiNbO3 surface acoustic wave propulsion system

Biomimetic Intelligence and Robotics
Acoustic propulsion system presents a novel underwater propulsion approach in small scale swimmer. This study introduces a submerged surface acoustic wave (SAW) propulsion system based on the SiO2/Al/LiNbO 3 structure.
Deqing Kong, Ryo Tanimura, Fang Wang, Kailiang Zhang, Minoru Kuribayashi Kurosawa, Manabu Aoyagi   +5 more
doaj   +1 more source

Active vibration control for underwater signature reduction of a navy ship [PDF]

, 2010
Dutch navy ships are designed and built to have a low underwater signature. For low frequencies however, tonal vibrations of a gearbox can occur, which might lead to increased acoustic signatures. These vibrations are hard to reduce by passive means.
Basten, Tom, Berkhoff, Arthur, Vermeulen, Ruud   +2 more
core   +2 more sources

Generalized Method Of Designing Unmanned Remotely Operated Complexes Based On The System Approach [PDF]

, 2019
Self-propelled underwater systems belong to the effective means of marine robotics. The advantages of their use include the ability to perform underwater work in real time with high quality and without risk to the life of a human operator.
Blintsov, V. (Volodymyr), Klochkov, O. (Olexandr)   +1 more
core   +2 more sources

Bio‐Inspired Molecular Events in Poly(Ionic Liquids)

Advanced Functional Materials, EarlyView.
Originating from dipolar and polar inter‐ and intra‐chain interactions of the building blocks, the topologies and morphologies of poly(ionic liquids) (PIL) govern their nano‐ and micro‐processibility. Modulating the interactions of cation‐anion pairs with aliphatic dipolar components enables the tunability of properties, facilitated by “bottom‐up ...
Jiahui Liu, Marek W. Urban
wiley   +1 more source