scholarly journals Habitat selection of a coastal shark species estimated from an autonomous underwater vehicle

2015 ◽  
Vol 528 ◽  
pp. 277-288 ◽  
Author(s):  
DE Haulsee ◽  
MW Breece ◽  
DC Miller ◽  
BM Wetherbee ◽  
DA Fox ◽  
...  
Keyword(s):  
Habitat Selection ◽  
Autonomous Underwater Vehicle ◽  
Underwater Vehicle ◽  
Shark Species ◽  
Selection Of

scholarly journals A measure of control of submerging and surfacing of an Autonomous underwater vehicle for exploring underwater of rivers

2020 ◽  
Vol 3 (SI1) ◽  
pp. SI151-SI156
Author(s):  
Le Khanh Tan ◽  
Tran Ngoc Huy ◽  
Pham Huy Hoang
Keyword(s):  
Autonomous Underwater Vehicle ◽  
Underwater Vehicle ◽  
Fixed Position ◽  
Time Service ◽  
Main Factors ◽  
Underwater Tunnel ◽  
Save Energy ◽  
Almost All ◽  
Great Energy ◽  
Selection Of

Autonomous underwater vehicle (AUV) known, as a special purpose underwater research vehicle (SPURV) is really a pocket submarine that could be used in multipurpose such as meteorology, probing the pollution of stream, military spying, exploring an underwater tunnel or wrecked ships and other purposes. With the reason of the power of battery inside of AUV is limited, the aim of this paper is to represent an effect way of control the submerging and surfacing of an AUV in order to save energy for a longer time service or a deeper and further expedition under water. In fact, there are so many ways for saving energy of the battery of AUV and in this paper, the selection of keeping permanently the horizontal direction of the AUV in any operation as the situation of a real submarine is applied. The diving and surfacing of AUV are consigned to the motor of the pump that consumes a little of energy to keep the proportion of the weight and the Archimedes force by pumping water inside or outside of the AUV. The selection of volume of pumped water is considered as a dynamic ballast mass for maintaining the horizontal equilibrium of the AUV at the time of submerging and surfacing. In the other hand, the controlling of the gravity point of AUV for maintaining a fixed position of gravity of the AUV when submerging and surfacing are the main factors of the paper that is also investigated in this paper. Finally, the motor of the propeller or thruster that always spends a great energy has committed only for forward or backward motion of the AUV. In this measure, the motor of thruster does not confronted with a great consummation of energy when submerging and surfacing in an oblique direction as almost all popular measures of control of AUV.

System Reliable Probability for Multi-AUV Cooperative Systems under the Influence of Current

2019 ◽  
Vol 72 (06) ◽  
pp. 1649-1659
Author(s):  
Qingwei Liang ◽  
Tianyuan Sun ◽  
Junlin Ou
Keyword(s):  
Marine Environment ◽  
Reliability Index ◽  
Autonomous Underwater Vehicle ◽  
Influencing Factor ◽  
Practical Method ◽  
Underwater Vehicle ◽  
Cooperative Systems ◽  
Cooperative System ◽  
Structure Selection ◽  
Selection Of

Real multi-Autonomous Underwater Vehicle (AUV) cooperative systems operate in complicated marine environments. The interaction between a multi-AUV cooperative system and its marine environment will affect the reliability of the system. Current is an important influencing factor of multi-AUV cooperative systems. A reliability index of multi-AUV cooperative systems known as System Reliable Probability (SRP) is proposed in this study. A method to calculate SRP is introduced, and the influence of current on SRP is discussed in detail. Current is considered an attack source, and the degree of its influence on SRP is calculated. As an example, the performance of this method is shown on two multi-AUV cooperative systems. Results show that the influence of the same current environment on different structures of the multi-AUV cooperative systems differs. This result provides a reference for the structure selection of multi-AUV systems. This study provides a practical method to estimate the reliability of multi-AUV cooperative systems.

scholarly journals Building the controler for differential diving modes of VIAM-AUV2000

2021 ◽  
Vol 3 (SI2) ◽  
pp. first
Author(s):  
Thanh Hải Châu ◽  
Trần Ngọc Huy ◽  
Tôn Thiện Phương ◽  
Huỳnh Mạnh Diễn
Keyword(s):  
Autonomous Underwater Vehicle ◽  
Underwater Vehicle ◽  
Electrical Circuit ◽  
Hybrid Design ◽  
Stable Operation ◽  
New Form ◽  
Axis Rotation ◽  
Easy Integration ◽  
Selection Of ◽  
Optimal Calculation

This paper presents a new form of the autonomous underwater vehicle with a built-in subsystem of cylinder and counterbalance to support floating and diving, the electrical and mechanical system is built-in a modular form for easy integration and disassembly - mounting and expanding the system. In particular, show optimal calculation for diving robot's profile, simulating stress, deformation impact on the profile of the robot to select the hull's material and thickness to make sure the robot is durable and steady at a depth of 50m. The paper also presents advantages of hybrid design between traditional AUV which uses propeller and rudder to turn and glider using counterbalance and cylinder to dive. In addition, the design of the control system for the robot is also mentioned and clarified through the selection of sensors, actuators, designing electrical circuit, designing 600W thruster and tri-axis rotation angles estimator for stable operation of the robot at a depth of 50m. In addition, the paper also presents the dynamic model of the diving robot VIAMAUV2000, from which, builds, simulates and applies controller for diving robot in two main forms: using thruster (AUV mode) and not using thruster (Glider mode).

Seasonal habitat selection of an expanding sika deer Cervus nippon population in eastern Hokkaido, Japan

2003 ◽  
Vol 9 (1) ◽  
pp. 141-153 ◽  
Author(s):  
Mayumi Sakuragi ◽  
Hiromasa Igota ◽  
Hiroyuki Uno ◽  
Koichi Kaji ◽  
Masami Kaneko ◽  
...  
Keyword(s):  
Habitat Selection ◽  
Sika Deer ◽  
Cervus Nippon ◽  
Selection Of

Factors of Habitat Selection of Acheulean Sites at Ramat Yiron, Israel

Paléorient ◽  
1981 ◽  
Vol 7 (1) ◽  
pp. 23-31 ◽  
Author(s):  
Amiel Brosh ◽  
M. Ohel
Keyword(s):  
Habitat Selection ◽  
Selection Of

Development of a Semi-Autonomous Underwater Vehicle for Intervention Missions (SAUVIM Phase III-B)

2009 ◽  
Author(s):  
Giacomo Marani ◽  
Junku Yuh ◽  
Song K. Choi ◽  
Son-Cheol Yu ◽  
Luca Gambella ◽  
...  
Keyword(s):  
Autonomous Underwater Vehicle ◽  
Underwater Vehicle ◽  
Phase Iii
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