Results 41 to 50 of about 3,835 (288)

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

Ultra-fast escape of a deformable jet-propelled body [PDF]

, 2013
In this work a cephalopod-like deformable body that fills an internal cavity with fluid and expels it to propel an escape manoeuvre, while undergoing a drastic external shape change through shrinking, is shown to employ viscous as well as mainly inviscid
Triantafyllou, M.S., Weymouth, G.D.
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

On the reliability of the Autosub autonomous underwater vehicle [PDF]

, 2003
As autonomous underwater vehicles (AUVs) enter operational service an assessment of their reliability is timely. Using the Autosub AUV as an example, several design issues affecting reliability are discussed, followed by an analysis of recorded faults ...
Stevenson, P., Challenor, P.G., P. Stevenson, N. W. Millard, Griffiths, G., G. Griffiths, McPhail, S.D., Millard, N.W., S. D. Mcphail   +8 more
core  

Overview effect of biodiesel storage on properties and characteristics [PDF]

, 2014
. Biofuels based on vegetable oils offer the advantage being a sustainable and environmen-tally attractive alternative to conventional petroleum based fuel.
Zakaria, Hanis, Khalid, Amir, Mustaffa, Norrizal, Sies, Mohamad Farid   +3 more
core   +1 more source

Review of Thermally Activated Twisted Coiled Polymer Actuators: A Materials Science Perspective

Advanced Functional Materials, EarlyView.
Thermally activated twisted and coiled polymer actuators (TCPAs) combine lightweight design, large deformation, and scalable fabrication for soft robotic and wearable applications. This review connects polymer structure, processing history, helix geometry, and thermomechanical characterization to actuator performance, highlighting current challenges in
Nadja Schenk, Lukas Benecke, Chokri Cherif, Johannes Mersch   +3 more
wiley   +1 more source

Hybrid Rocket Underwater Propulsion: A Preliminary Assessment [PDF]

, 2019
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.
Heejang Moon, Minchan Kwon, Youngjun You, Seongjoo Han   +3 more
core   +1 more source

Topology and Material Optimization in Ultra‐Soft Magneto‐Active Structures: Making Advantage of Residual Anisotropies

Advanced Materials, EarlyView.
Residual magnetization induces pronounced mechanical anisotropy in ultra‐soft magnetorheological elastomers, shaping deformation and actuation even without external magnetic fields. This study introduces a computational‐experimental framework integrating magneto‐mechanical coupling into topology optimization for designing soft magnetic actuators with ...
Carlos Perez‐Garcia, Rogelio Ortigosa, Jesús Martínez‐Frutos, Daniel Garcia‐Gonzalez   +3 more
wiley   +1 more source