Results 21 to 30 of about 22,066 (299)

Energetic and physical limitations on the breaching performance of large whales

eLife, 2020
The considerable power needed for large whales to leap out of the water may represent the single most expensive burst maneuver found in nature. However, the mechanics and energetic costs associated with the breaching behaviors of large whales remain ...
Paolo S Segre, Jean Potvin, David E Cade, John Calambokidis, Jacopo Di Clemente, Frank E Fish, Ari S Friedlaender, William T Gough, Shirel R Kahane-Rapport, Cláudia Oliveira, Susan E Parks, Gwenith S Penry, Malene Simon, Alison K Stimpert, David N Wiley, KC Bierlich, Peter T Madsen, Jeremy A Goldbogen   +17 more
doaj   +1 more source

Analysis on effect of shaft strut hydrofoil on anti-cavitation performance for surface ship

Zhongguo Jianchuan Yanjiu, 2019
[Objectives] In order to improve the anti-cavitation performance of shaft strut on a surface ship,[Methods] we study the front strut, compare the pressure distribution and anti-cavitation performance of the improved hydrofoil with those of the original ...
ZHANG Kai, YE Jinming, WANG Youqian, YU Anbin   +3 more
doaj   +1 more source

Baleka: A Bipedal Robot for Studying Rapid Maneuverability

Frontiers in Mechanical Engineering, 2020
In nature animals are highly adapted to perform rapid maneuvers. However, these maneuvers have generally been avoided by robotics researchers due to the complex (and poorly-understood) dynamics they entail.
Callen Fisher, Alexander Blom, Amir Patel   +2 more
doaj   +1 more source

Aerodynamic Analysis and Simulation for a Z-Shaped Folding Wing UAV

Aerospace
The potential of folding wing unmanned aerial vehicles (UAVs) in enhancing the adaptability of complex missions is substantial. Analyzing the aerodynamic characteristics of these UAVs is vital for optimizing the design of their folding wing configuration
Jin-Gang Wang, Xiang-Ying Guo
doaj   +1 more source

Maneuverability Performance of a KRISO Container Ship (KCS) with a Bulb-Type Wavy Twisted Rudder and Asymmetric Pre-Swirl Stator

Journal of Marine Science and Engineering, 2023
The maneuverability performance of a KCS with energy-saving devices was investigated. A bulb-type wavy rudder and an asymmetric pre-swirl stator were used as energy-saving devices because their use resulted in considerable efficiency gain.
Yong-Jin Shin, Moon Chan Kim, Kyuong-Wan Lee, Woo Seok Jin, Jin Wook Kim   +4 more
doaj   +1 more source

Large-Sized Multirotor Design: Accurate Modeling with Aerodynamics and Optimization for Rotor Tilt Angle

Drones, 2023
Advancements in aerial mobility (AAM) are driven by needs in transportation, logistics, rescue, and disaster relief. Consequently, large-sized multirotor unmanned aerial vehicles (UAVs) with strong power and ample space show great potential.
Anhuan Xie, Xufei Yan, Weisheng Liang, Shiqiang Zhu, Zheng Chen   +4 more
doaj   +1 more source

Stability versus maneuverability in hovering flight [PDF]

Physics of Fluids, 2015
Insects and birds are often faced by opposing requirements for agile and stable flight. Here, we explore the interplay between aerodynamic effort, maneuverability, and stability in a model system that consists of a Λ-shaped flyer hovering in a vertically oscillating airflow.
Yangyang Huang, Monika Nitsche, Eva Kanso   +2 more
openaire   +2 more sources

Maneuverability of a flat-streamlined underwater vehicle [PDF]

Proceedings 2001 ICRA. IEEE International Conference on Robotics and Automation (Cat. No.01CH37164), 2002
Maneuverability describes a vehicle's ability to change course or turn. Maneuverability of conventional underwater vehicles, such as torpedoes, can be determined by altering the position and length of control fins. To perform large-area surveying tasks, autonomous underwater vehicles (AUV) generally require different maneuverability characteristics in ...
Guo, Jenhwa, Chiu, Forng-Chen
openaire   +3 more sources

Influence of Design Parameters of High-Speed Undersea Vehicles with X-Shaped All-Movable Rudder and Cross-Shaped Fin on Maneuverability

水下无人系统学报, 2023
Parameterized shape of the undersea vehicle with X-shaped full-rudder and cross-shaped fin layout was established.The function of the fluid dynamic coefficient of the undersea vehicle with the size of each part was established by the principle of ...
Rui ZHANG
doaj   +1 more source

Numerical analysis on maneuverability of amphibious rescue boat in restricted waters

Zhongguo Jianchuan Yanjiu
ObjectivesTo study the maneuverability of amphibious rescue boats in restricted waters, a method for predicting maneuvering motion is proposed and the maneuvering performance of rescue boats in nearshore and shallow waters is investigated.MethodsA CFD ...
Jiadong WEN, Jiangyan SHAO, Qipeng CHENG, Weiqin LIU, Xuming WANG   +4 more
doaj   +1 more source