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Hydropod: An Onboard Deployed Acoustic–Visual Device for Propeller Cavitation and Noise Investigations

Lookup NU author(s): Batuhan Aktas, Professor Mehmet Atlar, Dr Noriyuki Sasaki, Patrick Fitzsimmons

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Abstract

IEEE Conducting noise trials with big merchant vessels could constitute serious economic and time losses for the ship operators. This study aims to introduce an experimental acoustic–visual device enabling economical and cost-effective noise trials in full scale. Noise emission and dynamics of propeller cavitation are investigated on a research vessel equipped with a customized submerged device called “Hydropod” that consists of hydrophones and a high definition, wide-angle underwater camera. Previously conducted noise trials following the international standards with an off-board hydrophone array are utilized for the validation of the adopted approach. The comparisons between the Hydropod measurements and conventional noise trial measurement results have shown promising correlations, except for a self-noise hump present in the noise spectra of the Hydropod measurements. Furthermore, by taking advantage of the replacement of the conventional propellers of the catamaran with a set of new profile technology (NPT) propellers, additional trials were conducted using the Hydropod. This enabled interpretation of the relative performance of both sets of propellers in terms of acoustics and cavitation extent. The NPT propellers were superior compared to the conventional propellers over the cavitation extent and resulting acoustic emissions.

Publication metadata

Author(s): Aktas B, Atlar M, Leivadaros S, Sasaki N, Fitzsimmons P

Publication type: Article

Publication status: Published

Journal: IEEE Journal of Oceanic Engineering

Year: 2018

Volume: 44

Issue: 1

Pages: 72-86

Print publication date: 01/01/2019

Online publication date: 09/01/2018

Acceptance date: 02/04/2016

ISSN (print): 0364-9059

ISSN (electronic): 1558-1691

Publisher: IEEE Oceanic Engineering Society

URL: https://doi.org/10.1109/JOE.2017.2778518

DOI: 10.1109/JOE.2017.2778518

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