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Autonomous underwater gliders are buoyancy propelled vehicles. Their way of propulsion relies upon changing their buoyancy with internal pumping systems enabling them up and down motions, and their forward gliding motions are generated by hydrodynamic lift forces exerted on a pair of wings attached to a glider hull. In this study lift and drag characteristics of a glider were performed using Computational...
Based on the current widespread use of underwater vehicles, a special type of underwater glider equipped with energy-saving diamond-structured rotatable wings that can improve the underwater vehicle's lift-drag ratio optimize hydrodynamic performance, and enhance flight quality was studied. With the support of adaptive meshing technology and Fluent's epsilon standard turbulence model, lift and drag...
This paper introduces a new kind of vertical underwater glider with swing wings, combining Argo float and underwater glider together to achieve the goal of operating in the ocean automatically. The paper analyses the rectilinear motion and force of this new kind of underwater glider. The calculated and simulated results are shown in this paper.
This paper presents a towing tank-based experiment study on hydrodynamic coefficients on the underwater glider — Seagull. The present measurements were carried out at typical speeds of glider (0.2–0.5m/s) with varying angle of attack and slide. The measurements were used to study variation of drag, lift and pitching moment coefficients and angle of attack. The measurements have also been used to validate...
Seagull is a small fully functional underwater glider designed for oceanographic research with 1 knot operating speed and six months duration. In this paper, we present the design of this glider and analyze its performance. The Seagull glider uses a piston-based buoyancy engine system with an inexpensive gear pump as the main system actuator. The Seagull's emergency release system is characterized...
Underwater glider is the new class of autonomous underwater vehicle which has been used for ocean observation and wide range of marine environment monitoring. The legacy gliders have low lift-drag ratio (L/D) and limited gliding efficiency because the hull generates barely lift force. To solve the problem of low lift-drag ratio, we developed an underwater glider (HFWUG) based on the flying wing design...
This paper presents an approach of analyzing the sawtooth and spiraling equilibrium motion of underwater gliders which is actuated by a single internal movable and rotatable mass. The equations are derived and then solved through a recursive algorithm. Hydrodynamic coefficients of the underwater glider are calculated by computational fluid dynamics (CFD) software packages. The motions of the underwater...
Underwater glider moves vertically by change in buoyancy and moves horizontally due to wings. In this paper, we validate the experimental lift and drag characteristics of a glider from the literature using Computational Fluid Dynamics (CFD) approach. This approach is then used for the assessment of the steady state characteristics of a glider under development. Flow behavior and lift and drag force...
Underwater gliders are a new class of autonomous underwater vehicles, which are energy efficient, inexpensive and can be utilised for long duration mission. They use a ballast system and moving mass to glide in the saw-tooth path pattern through the ocean water column. This paper presents the dynamic model of USM underwater glider based on slender-body theory. In this work, a moving mass implementation...
The well-to-drag efficiency of PEMFC was investigated following a proton exchange membrane fuel cell (PEMFC) powered underwater glider Dragon. Due to the restriction of power source, the endurance of the legacy gliders is less than a year or has a small active area. To overcome those disadvantages of legacy gliders, the underwater vehicle Dragon was designed and the electrical efficiency of PEMFC...
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