Drag Analysis of Contractile Water Jet Locomoted Micro AUV in Laminar Fluid

2015 ◽  
Vol 799-800 ◽  
pp. 1188-1192
Author(s):  
Muhammad Farid Shaari
Keyword(s):  
Experimental Data ◽  
Autonomous Underwater Vehicle ◽  
Dynamic Pressure ◽  
Underwater Vehicle ◽  
Water Jet ◽  
Surface Drag ◽  
Simulation Data ◽  
Total Drag ◽  
Significant Difference ◽  
Drag Analysis

Drag analysis is vital to measure the performance of the autonomous underwater vehicle (AUV) as well as the AUV thruster. Most of the previous drag studies is regarding to the shape and swimming method that contribute to the AUV performance. However, few attention was given on drag which influence the development of thruster. Hence, this research was conducted to analyze the drag of the micro AUV in a laminar fluid flow in order to find the optimum thrust that must be gained by a contractile water jet thruster (CWJT). Besides, these studies also focus on the dynamic pressure and skin friction that forms the total drag which acted on the AUV surface. Drag was measured by using pull technique and simulation technique for AUV speed below 0.5ms-1. The results show that the recorded drag was between 9.0 x 10-4N and 1.8 x 10-1N. The trend line between the simulation data and experimental data has no significant difference and thus it shows that the simulation data were verified. Both results exhibits that the drag increase tremendously regarding to the AUV speed increment.

scholarly journals Updating Autonomous Underwater Vehicle Risk Based on the Effectiveness of Failure Prevention and Correction

2018 ◽  
Vol 35 (4) ◽  
pp. 797-808 ◽  
Author(s):  
Mario P. Brito ◽  
Gwyn Griffiths
Keyword(s):  
Autonomous Underwater Vehicle ◽  
Risk Mitigation ◽  
Autonomous Underwater Vehicles ◽  
Underwater Vehicle ◽  
Underwater Vehicles ◽  
Probability Of Failure ◽  
Risk Profile ◽  
Failure Prevention ◽  
Significant Difference

AbstractAutonomous underwater vehicles (AUVs) have proven to be feasible platforms for marine observations. Risk and reliability studies on the performance of these vehicles by different groups show a significant difference in reliability, with the observation that the outcomes depend on whether the vehicles are operated by developers or nondevelopers. This paper shows that this difference in reliability is due to the failure prevention and correction procedures—risk mitigation—put in place by developers. However, no formalization has been developed for updating the risk profile based on the expected effectiveness of the failure prevention and correction process. A generic Bayesian approach for updating the risk profile is presented, based on the probability of failure prevention and correction and the number of subsequent deployments on which the failure does not occur. The approach, which applies whether the risk profile is captured in a parametric or nonparametric survival model, is applied to a real case study of the International Submarine Engineering Ltd. (ISE) Explorer AUV.

Dynamic model for an autonomous underwater vehicle based on experimental data

2013 ◽  
Vol 19 (2) ◽  
pp. 175-200 ◽  
Author(s):  
Y. Valeriano-Medina ◽  
A. Martínez ◽  
L. Hernández ◽  
H. Sahli ◽  
Y. Rodríguez ◽  
...  
Keyword(s):  
Experimental Data ◽  
Dynamic Model ◽  
Autonomous Underwater Vehicle ◽  
Underwater Vehicle

The Use of Acrylic as a Structural Material in the Design of Translucent Elements of Deep-Submergence Vehicles

2021 ◽  
Vol 1031 ◽  
pp. 196-200
Author(s):  
Natalya A. Gasratova ◽  
Victor S. Zuev
Keyword(s):  
Experimental Data ◽  
Structural Material ◽  
Characteristic Feature ◽  
Deep Sea ◽  
Underwater Vehicle ◽  
Strength Analysis ◽  
Present Stage ◽  
Significant Difference ◽  
External Conditions ◽  
Main Characteristic Feature

The exploration of the depths of the sea is an activity that is important for many branches of science; it is associated with the work of people and technology in extremely difficult external conditions, which, in their extremeness, are comparable, perhaps, only with the conquest of space. At the present stage, deep-sea surveys are carried out using various instruments, including manned ones. These machines do not belong to the class of military large-tonnage submarines, but to the so-called Bubble Subs. The hull, which is a translucent thick-walled spherical shell is the main characteristic feature of this type of underwater vehicle. The presented work lists the main problems faced by researchers in the strength analysis of such PMMA hulls. In particular, the issue of the significant difference between the results of calculations in cases where the material is considered as physically linear and as physically non-linear is disclosed in detail. In addition, the obtained numerical results are compared with the experimental data.

scholarly journals Optimal design of power generation equipment for autonomous underwater vehicle

2018 ◽  
Vol 10 (11) ◽  
pp. 168781401880950
Author(s):  
Fen Guo ◽  
Baowei Song ◽  
Zhaoyong Mao ◽  
Wenlong Tian
Keyword(s):  
Power Generation ◽  
Autonomous Underwater Vehicle ◽  
Vertical Axis ◽  
Underwater Vehicle ◽  
Effective Solution ◽  
Initial Error ◽  
Current Generator ◽  
Simulation Data ◽  
Power Generation Equipment ◽  
Expansion Angle

Autonomous underwater vehicle with the ability to generate electricity is an effective solution for detecting the ocean. In this article, a vertical-axis current generator for underwater vehicle is designed. The blades used for power generation are attached to the surface of the underwater vehicle and can be freely deployed and closed so as not to affect the fluid performance of the underwater vehicle. Comparing the experimental data of an ordinary impeller with simulation data, the initial error of the experiment is obtained. Through the experimental method with adjusting the spread angle and blade curvature, the best configuration of the impeller was eventually obtained. When the radian and expansion angle are both set to 120°, the maximum power of 0.599 W can be provided.

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
Sign in / Sign up

Export Citation Format

Share Document