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Determining the Horizontal and Vertical Water Velocity Components of a Turbulent Water Column Using the Motion Response of an Autonomous Underwater Vehicle

Citation

Randeni P, SAT and Forrest, AL and Cossu, R and Leong, ZQ and Ranmuthugala, SD, Determining the Horizontal and Vertical Water Velocity Components of a Turbulent Water Column Using the Motion Response of an Autonomous Underwater Vehicle, Journal of Marine Science and Engineering, 5, (3) pp. 25-41. ISSN 2077-1312 (2017) [Refereed Article]


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Official URL: http://www.mdpi.com/2077-1312/5/3

DOI: doi:10.3390/jmse5030025

Abstract

This work introduces a new method to calculate the water velocity components of a turbulent water column in the x, y, and z directions using Autonomous Underwater Vehicle (AUV) motion response (referred to as the ‘WVAM method’). The water column velocities were determined by calculating the difference between the motion responses of the vehicle in calm and turbulent water environments. The velocity components obtained using the WVAM method showed good agreement with measurements from an acoustic Doppler current profiler (ADCP) mounted to the AUV. The standard deviation between the two datasets were below 0.09 m s−1 for the velocity components in the x, y, and z directions, and were within the uncertainty margin of the ADCP measurements. With the WVAM method, it is possible to estimate the velocity components within close proximity to the AUV. This region encompasses the vehicle boundary layer and the ADCP blanking distance, which is not typically resolved. Estimating vertical and horizontal velocities around the boundary layer of the AUV is important for vehicle navigation and control system optimization, and to fill the blanking distance gap within a water column velocity profile, which is important for flow field characterization. The results show that it is possible to estimate the flow field in the vicinity of AUVs and other self-propelled vehicles

Item Details

Item Type:Refereed Article
Keywords:autonomous underwater vehicles; acoustic Doppler current profilers; water column velocities; hydrodynamic coefficients; system identification
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Naval Architecture
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in Engineering
Author:Randeni P, SAT (Mr Supun Randeni Pathiranachchilage)
Author:Forrest, AL (Dr Alexander Forrest)
Author:Cossu, R (Dr Remo Cossu)
Author:Leong, ZQ (Dr Zhi Leong)
Author:Ranmuthugala, SD (Professor Dev Ranmuthugala)
ID Code:122786
Year Published:2017
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2017-11-28
Last Modified:2017-12-01
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