NDLI: A method to predict underwater noise from cavitating propellers

Content Provider	IEEE Xplore Digital Library
Author	Firenze, E. Valdenazzi, F.
Copyright Year	2015
Description	Author affiliation: Oper. - Ship Platform B.U., CETENA S.p.A., Genoa, Italy (Valdenazzi, F.) \|\| Oper. - Syst. Eng. & Res. B.U., CETENA S.p.A., Genoa, Italy (Firenze, E.)
Abstract	Submitted for the special session Oceans of Tomorrow: AQUO and SONIC activities towards the ship noise characterisation, invited by Ruggero Dambra (ruggero.dambra@cetena.it). The potential impact that all types of vessel emissions, including underwater noise, could have on marine fauna has become an important issue during past decade. Surface vessels radiate underwater noise mainly due to machinery on board, propulsion mechanism and hydrodynamic flow around the ship hull ad appendages. Growing attention of the international community on environmental issues and, in particular, the requirements of the European Union on the underwater noise has recently led to a research effort to better understand and predict propeller cavitation noise. In fact, a cavitating propeller is one of the main sources on board ships, since it produces both structure-borne and radiated noise with a spectrum that usually covers a wide range of frequencies, with both tonal (blade passage related) and broadband components. The EU SONIC project is aimed to develop tools to investigate and mitigate the effects of underwater noise generated by shipping, mainly focussed on understanding and modeling propeller cavitation noise. In the frame of the SONIC project, CETENA has implemented a full numerical procedure for the prediction of propeller cavitation noise in terms of tonal pressure fluctuations and broadband noise, based on the combination of hydrodynamic and acoustic boundary element methods, and has applied it to the case of a container vessel. As far as the tonals are concerned, the associated source levels are estimated based on the computation of the hull pressure levels at the blade passing frequencies (bpf); from the hull pressures, equivalent noise sources are identified and used to compute far field noise levels. As far as the broadband noise is concerned, two main contributions are modelled, respectively due to the propeller tip vortex and to the broadband effects of sheet cavitation. The former is estimated based on a semi-empirical model, the latter using an analytical model of cavitation dynamics. In particular the prediction of hull flow and wake at propeller disk is carried out with the RANSE solver ANSYS-CFX, the analysis of propeller hydrodynamic behaviour and cavitation prediction is performed with CRS PROCAL, the identification of propeller equivalent noise sources is carried out with CRS EXCALIBUR, the computation of the broadband part due to propeller tip vortex of the hull pressure is carried out with the CRS ETV model, the prediction of the broadband effects of sheet cavitation is performed with CRS MATusiakLAB and the computation of the radiated noise is carried out with LMS SYSNOISE. This paper presents CETENA's procedure, describes and discusses its application to the test case. For the purposes of extensive validation, propeller cavitation pattern, hull pressures and far field noise spectra are compared with experimental data achieved by HSVA within the SONIC project. The results of the validation study indicate that the adopted methodology is able to capture the relevant features of the propeller acoustic spectrum. Further research and development is needed concerning numerical methods to predict hull pressures that account for interaction between sheet and tip vortex cavitation. The methodology involves modelling/computational efforts that are compatible with the typical propeller/ship design process; it is therefore suitable for design applications. Strengths and weaknesses of the methodology are further discussed in the paper, with focus on design applications; areas for further development and validation are highlighted too. The research leading to these results has received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n°314394.
Starting Page	1
Ending Page	6
File Size	443621
Page Count	6
File Format	PDF
e-ISBN	9781479987368
DOI	10.1109/OCEANS-Genova.2015.7271453
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-05-18
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Propellers Noise Broadband communication Blades Computational modeling Marine vehicles Acoustics tip vortex underwater noise propeller broadband sheet cavitation
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Numerical Investigation of Tip Vortex Cavitation Inception and Noise of Underwater Propellers of Submarine Using Sequential Eulerian–Lagrangian Approaches

Computational and experimental prediction of propeller cavitation noise

A Semi-Empirical Prediction Method for Broadband Hull-Pressure Fluctuations and Underwater Radiated Noise by Propeller Tip Vortex Cavitation †

Application of Large Eddy Simulation to Predict Underwater Noise of Marine Propulsors. Part 1: Cavitation Dynamics

Numerical method for predicting ship propeller cavitation noise

Application of Large Eddy Simulation to Predict Underwater Noise of Marine Propulsors. Part 2: Noise Generation

Investigation of Cavitation Phenomena on Noise of Underwater Propeller

Aspects of the Cavitating Propeller Tip Vortex as a Source of Inboard Noise and Vibration

Model scale investigation of the effect of different speed reduction strategies on cavitating propeller radiated noise

A method to predict underwater noise from cavitating propellers

Similar Documents

Numerical Investigation of Tip Vortex Cavitation Inception and Noise of Underwater Propellers of Submarine Using Sequential Eulerian–Lagrangian Approaches

Computational and experimental prediction of propeller cavitation noise

A Semi-Empirical Prediction Method for Broadband Hull-Pressure Fluctuations and Underwater Radiated Noise by Propeller Tip Vortex Cavitation †

Application of Large Eddy Simulation to Predict Underwater Noise of Marine Propulsors. Part 1: Cavitation Dynamics

Numerical method for predicting ship propeller cavitation noise

Application of Large Eddy Simulation to Predict Underwater Noise of Marine Propulsors. Part 2: Noise Generation

Investigation of Cavitation Phenomena on Noise of Underwater Propeller

Aspects of the Cavitating Propeller Tip Vortex as a Source of Inboard Noise and Vibration

Model scale investigation of the effect of different speed reduction strategies on cavitating propeller radiated noise

A method to predict underwater noise from cavitating propellers