Modelling underwater noise propagation emitted from oscillating lifting surfaces

I. Malefaki; A. Karperaki; Kostas Belibassakis

doi:10.1201/9781003358961-25

Modelling underwater noise propagation emitted from oscillating lifting surfaces

I. Malefaki, A. Karperaki, Kostas Belibassakis

Research output: Chapter in Book/Published conference output › Conference publication

Abstract

Underwater acoustic models based on the FW-H equation are considered for the generation and propagation of noise emitted from oscillating lifting surfaces, as in the case of flapping-foil thrusters used for the propulsion of small ships and AUVs. In such cases the study of the 3D field by means of the full wave equation in the inhomogeneous sea environment comes with excessive computational cost, even at low frequencies. Assuming azimuthal symmetry of the environmental parameters, a numerical model is developed based on a FDTD scheme, incorporating free-surface and seabed effects, and variable sound speed profile. For the treatment of the 3D initial-boundary value problem with excitation from point monopole and dipole sources the above scheme is implemented with a PML technique for modelling the radiating field at the open boundaries. Numerical results are presented illustrating the applicability of the present method to simulate fields from time-harmonic acoustic excitation.

Original language	English
Title of host publication	Sustainable Development and Innovations in Marine Technologies
Subtitle of host publication	Proceedings of the 19th International Congress of the International Maritime Association of the Mediterranean, IMAM 2022
Editors	Selma Ergin, C. Guedes Soares
Publisher	CRC Press/Balkema
Pages	193-200
Number of pages	8
ISBN (Print)	9781032416182
DOIs	https://doi.org/10.1201/9781003358961-25
Publication status	E-pub ahead of print - 13 Sept 2022
Event	19th International Congress of the International Maritime Association of the Mediterranean, IMAM 2022 - Istanbul, Turkey Duration: 26 Sept 2022 → 29 Sept 2022

Publication series

Name	Sustainable Development and Innovations in Marine Technologies - Proceedings of the 19th International Congress of the International Maritime Association of the Mediterranean, IMAM 2022

Conference

Conference	19th International Congress of the International Maritime Association of the Mediterranean, IMAM 2022
Country/Territory	Turkey
City	Istanbul
Period	26/09/22 → 29/09/22

Bibliographical note

Funding Information:
The present work has been supported by Seatech H2020 project received funding from the European Union’s Horizon 2020 research and innovation program under the grant agreement No 857840. The opinions expressed in this document reflect only the author’s view and in no way reflect the European Commission’s opinions. The European Commission is not responsible for any use that may be made of the information it contains.

Keywords

3D axisymmetric environment
FDTD-PML
Flapping thruster
Inhomo-geneous waveguide
Underwater noise propagation

Access to Document

10.1201/9781003358961-25

Cite this

Malefaki, I., Karperaki, A., & Belibassakis, K. (2022). Modelling underwater noise propagation emitted from oscillating lifting surfaces. In S. Ergin, & C. G. Soares (Eds.), Sustainable Development and Innovations in Marine Technologies : Proceedings of the 19th International Congress of the International Maritime Association of the Mediterranean, IMAM 2022 (pp. 193-200). (Sustainable Development and Innovations in Marine Technologies - Proceedings of the 19th International Congress of the International Maritime Association of the Mediterranean, IMAM 2022). CRC Press/Balkema. Advance online publication. https://doi.org/10.1201/9781003358961-25

Malefaki, I. ; Karperaki, A. ; Belibassakis, Kostas. / Modelling underwater noise propagation emitted from oscillating lifting surfaces. Sustainable Development and Innovations in Marine Technologies : Proceedings of the 19th International Congress of the International Maritime Association of the Mediterranean, IMAM 2022. editor / Selma Ergin ; C. Guedes Soares. CRC Press/Balkema, 2022. pp. 193-200 (Sustainable Development and Innovations in Marine Technologies - Proceedings of the 19th International Congress of the International Maritime Association of the Mediterranean, IMAM 2022).

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Malefaki, I, Karperaki, A & Belibassakis, K 2022, Modelling underwater noise propagation emitted from oscillating lifting surfaces. in S Ergin & CG Soares (eds), Sustainable Development and Innovations in Marine Technologies : Proceedings of the 19th International Congress of the International Maritime Association of the Mediterranean, IMAM 2022. Sustainable Development and Innovations in Marine Technologies - Proceedings of the 19th International Congress of the International Maritime Association of the Mediterranean, IMAM 2022, CRC Press/Balkema, pp. 193-200, 19th International Congress of the International Maritime Association of the Mediterranean, IMAM 2022, Istanbul, Turkey, 26/09/22. https://doi.org/10.1201/9781003358961-25

Modelling underwater noise propagation emitted from oscillating lifting surfaces. / Malefaki, I.; Karperaki, A.; Belibassakis, Kostas.
Sustainable Development and Innovations in Marine Technologies : Proceedings of the 19th International Congress of the International Maritime Association of the Mediterranean, IMAM 2022. ed. / Selma Ergin; C. Guedes Soares. CRC Press/Balkema, 2022. p. 193-200 (Sustainable Development and Innovations in Marine Technologies - Proceedings of the 19th International Congress of the International Maritime Association of the Mediterranean, IMAM 2022).

Research output: Chapter in Book/Published conference output › Conference publication

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AU - Malefaki, I.

AU - Karperaki, A.

AU - Belibassakis, Kostas

N1 - Funding Information: The present work has been supported by Seatech H2020 project received funding from the European Union’s Horizon 2020 research and innovation program under the grant agreement No 857840. The opinions expressed in this document reflect only the author’s view and in no way reflect the European Commission’s opinions. The European Commission is not responsible for any use that may be made of the information it contains.

PY - 2022/9/13

Y1 - 2022/9/13

N2 - Underwater acoustic models based on the FW-H equation are considered for the generation and propagation of noise emitted from oscillating lifting surfaces, as in the case of flapping-foil thrusters used for the propulsion of small ships and AUVs. In such cases the study of the 3D field by means of the full wave equation in the inhomogeneous sea environment comes with excessive computational cost, even at low frequencies. Assuming azimuthal symmetry of the environmental parameters, a numerical model is developed based on a FDTD scheme, incorporating free-surface and seabed effects, and variable sound speed profile. For the treatment of the 3D initial-boundary value problem with excitation from point monopole and dipole sources the above scheme is implemented with a PML technique for modelling the radiating field at the open boundaries. Numerical results are presented illustrating the applicability of the present method to simulate fields from time-harmonic acoustic excitation.

AB - Underwater acoustic models based on the FW-H equation are considered for the generation and propagation of noise emitted from oscillating lifting surfaces, as in the case of flapping-foil thrusters used for the propulsion of small ships and AUVs. In such cases the study of the 3D field by means of the full wave equation in the inhomogeneous sea environment comes with excessive computational cost, even at low frequencies. Assuming azimuthal symmetry of the environmental parameters, a numerical model is developed based on a FDTD scheme, incorporating free-surface and seabed effects, and variable sound speed profile. For the treatment of the 3D initial-boundary value problem with excitation from point monopole and dipole sources the above scheme is implemented with a PML technique for modelling the radiating field at the open boundaries. Numerical results are presented illustrating the applicability of the present method to simulate fields from time-harmonic acoustic excitation.

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Malefaki I, Karperaki A, Belibassakis K. Modelling underwater noise propagation emitted from oscillating lifting surfaces. In Ergin S, Soares CG, editors, Sustainable Development and Innovations in Marine Technologies : Proceedings of the 19th International Congress of the International Maritime Association of the Mediterranean, IMAM 2022. CRC Press/Balkema. 2022. p. 193-200. (Sustainable Development and Innovations in Marine Technologies - Proceedings of the 19th International Congress of the International Maritime Association of the Mediterranean, IMAM 2022). Epub 2022 Sept 13. doi: 10.1201/9781003358961-25

Modelling underwater noise propagation emitted from oscillating lifting surfaces

Abstract

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Conference

Bibliographical note

Keywords

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