Steady-state spiral motion simulation and turning speed analysis of an underwater glider

2017 ◽  
Author(s):  
Pengyao Yu ◽  
Yong Zhao ◽  
Tianlin Wang ◽  
Han Zhou ◽  
Shaojuan Su ◽  
...  
Keyword(s):  
Steady State ◽  
Motion Simulation ◽  
Underwater Glider ◽  
Spiral Motion

scholarly journals Design and Motion Simulation of an Underwater Glider in the Vertical Plane

2021 ◽  
Vol 11 (17) ◽  
pp. 8212
Author(s):  
Jiafeng Huang ◽  
Hyeung-Sik Choi ◽  
Dong-Wook Jung ◽  
Ji-Hyeong Lee ◽  
Myung-Jun Kim ◽  
...  
Keyword(s):  
Steady State ◽  
Buoyancy Force ◽  
Vertical Plane ◽  
Power Source ◽  
Motion Simulation ◽  
Underwater Glider ◽  
Simulation Performance ◽  
Underwater Gliders ◽  
Simulation Results ◽  
Sea Currents

Net buoyancy, as the main power source for the motion of an underwater glider, is affected by the pump or bladder that the glider adopts to change its buoyancy force in water. In this study, a new underwater glider that can dive to a depth of 400 m at a cruising speed of 2 knots, which is faster than conventional underwater gliders and is less affected by sea currents, is investigated. The UG resisting 400 m pressure on the buoyancy engine and achieving 2 knots’ speed was designed and constructed. For this UG, its steady-state attitude was studied according to the variance of the buoyancy center and the center of gravity with the buoyancy engine influenced by the displacement of the movable mass block. In motion simulation of the UG, the attitude of the UG under different displacement conditions was simulated in Simulink according to the displacements of the piston and the movable mass block. To validate the simulation performance, a UG was constructed and experiments were conducted. The simulation and experimental results were compared to show the reliability of the simulation results under limited conditions.

EFFECT OF WATER CURRENT ON UNDERWATER GLIDER VELOCITY AND RANGE

2016 ◽  
Vol 78 (10-4) ◽  
Author(s):  
Muhammad Yasar Javaid ◽  
Mark Ovinis ◽  
Fakhruldin Mohd Hashim ◽  
Adi Maimun ◽  
Yasser M. Ahmed ◽  
...  
Keyword(s):  
Steady State ◽  
Numerical Simulations ◽  
Relative Motion ◽  
Water Current ◽  
Underwater Glider ◽  
Water Currents ◽  
Effect Of Water ◽  
Actuation System ◽  
Autonomous Underwater Glider

An autonomous underwater glider speed and range is influenced by water currents. This is compounded by a weak actuation system for controlling its movement. In this work, the effects of water currents on the speed and range of an underwater glider at steady state glide conditions are investigated. Extensive numerical simulations have been performed to determine the speed and range of a glider with and without water current at different net buoyancies. The results show that the effect of water current on the glider speed and range depends on the current relative motion and direction. In the presence of water current, for a given glide angle, glide speed can be increased by increasing the net buoyancy of the glider.

CFD Approach to Modelling Hydrodynamic Characteristics of Underwater Glider

2019 ◽  
Vol 2019 (4) ◽  
pp. 32-45
Author(s):  
Kamila Stryczniewicz ◽  
Przemysław Drężek
Keyword(s):  
Flow Behavior ◽  
Equations Of Motion ◽  
Vertical Plane ◽  
Dynamic Modelling ◽  
The Body ◽  
Hydrodynamic Characteristics ◽  
Motion Simulation ◽  
Underwater Glider ◽  
Lift And Drag ◽  
Equations Of Motions

Abstract 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 Fluid Dynamics (CFD) approach and results were compared with the literature. Flow behavior, lift and drag forces distribution at different angles of attack were studied for Reynolds numbers varying around 105 for NACA0012 wing configurations. The variable of the glider was the angle of attack, the velocity was constant. Flow velocity was 0.5 m/s and angle of the body varying from −8° to 8° in steps of 2°. Results from the CFD constituted the basis for the calculation the equations of motions of glider in the vertical plane. Therefore, vehicle motion simulation was achieved through numeric integration of the equations of motion. The equations of motions will be solved in the MatLab software. This work will contribute to dynamic modelling and three-dimensional motion simulation of a torpedo shaped underwater glider.

scholarly journals Modeling and Motion Simulation for A Flying-Wing Underwater Glider with A Symmetrical Airfoil

2019 ◽  
Vol 33 (3) ◽  
pp. 322-332 ◽  
Author(s):  
Liang Zhao ◽  
Peng Wang ◽  
Chun-ya Sun ◽  
Bao-wei Song
Keyword(s):  
Motion Simulation ◽  
Underwater Glider

Dynamic Analysis of the Acoustic Velocity Profile Observation Underwater Glider

2013 ◽  
Vol 475-476 ◽  
pp. 50-54
Author(s):  
Li Juan Jia ◽  
Zhan Feng Qi ◽  
Sen Zhang ◽  
Yu Feng Qin ◽  
Jian Shi ◽  
...  
Keyword(s):  
Steady State ◽  
Large Scale ◽  
Acoustic Velocity ◽  
Design Parameters ◽  
Underwater Glider ◽  
Longitudinal Plane ◽  
Underwater Gliders ◽  
Long Duration ◽  
Fluent Software ◽  
Drag And Lift

Underwater gliders carried acoustic velocity meters can realize ocean profile observations of the acoustic velocity for long duration and large scale. This paper mainly studies the kinematics and hydrodynamics of the Slocum underwater glider carrying a acoustic velocity meter MINOSX with length 565mm and diameter 76mm. Thus, theory reference for optimal design parameters of the underwater glider is proposed. By establishing the kinematic equations and giving some related parameters, variations with time of the steady-state gliding velocity, pitch angle, gliding path and attack angle are simulated by using Matlab software; The simulation calculations of the hydro-drag and lift are completed by using Fluent software. Finally, this paper summarizes the dynamic characteristics in steady state of the underwater glider in longitudinal plane.

Dynamic Modeling and Motion Simulation of a Movable-Winged Underwater Glider

2012 ◽  
Vol 490-495 ◽  
pp. 1326-1331
Author(s):  
Bao Wei Song ◽  
Wen Long Tian ◽  
Zhao Yong Mao
Keyword(s):  
Dynamic Modeling ◽  
Autonomous Underwater Vehicles ◽  
Added Mass ◽  
Underwater Vehicles ◽  
Hydrodynamic Forces ◽  
Longitudinal Motion ◽  
Motion Simulation ◽  
Underwater Glider ◽  
Underwater Gliders ◽  
Motion Characteristics

Underwater gliders are a class of Autonomous Underwater Vehicles (AUVs) that offer many advantages over traditional AUVs. Previous research has mainly focused on underwater gliders with fixed wings. This paper studied a novel underwater glider whose wings can pitch independently about its installed shaft, called Movable-Winged Underwater Glider (MWUG). A 6-DOF model of dynamics for MWUG was developed based on Newton’s law and Euler’s equation, gravity, buoyancy, added mass forces and hydrodynamic forces considered. Longitudinal motion simulations were conducted to clarify the motion characteristics of MWUG. Results of the simulations indicated that compared to fix-winged gliders, MWUGs show a smaller glide angle and attack angle, higher glide speed and efficiency

Dynamic modeling and motion simulation for a winged hybrid-driven underwater glider

2011 ◽  
Vol 25 (1) ◽  
pp. 97-112 ◽  
Author(s):  
Shu-xin Wang ◽  
Xiu-jun Sun ◽  
Yan-hui Wang ◽  
Jian-guo Wu ◽  
Xiao-ming Wang
Keyword(s):  
Dynamic Modeling ◽  
Motion Simulation ◽  
Underwater Glider
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