scholarly journals Achievement of the new underwater radiated noise requirements by the Spanish shipbuilding industry. The FRV "Ramón Margalef".

2012 ◽  
Author(s):  
Publio Beltrán ◽  
José I. Diaz ◽  
Raul Salinas
Keyword(s):  
Shipbuilding Industry ◽  
Radiated Noise ◽  
Underwater Radiated Noise

scholarly journals The Most Recent Noise & Vibration Assessment of the European Fleet, within the Framework of the “SILENV Project”

2014 ◽  
Vol 7 (14) ◽  
pp. 43
Author(s):  
Publio Beltrán Palomo
Keyword(s):  
Environmental Impact ◽  
Scientific Community ◽  
Direct Consequence ◽  
Shipbuilding Industry ◽  
Radiated Noise ◽  
Green Policy ◽  
Underwater Radiated Noise ◽  
Starting Point ◽  
Noise Vibration ◽  
Intense Debate

The EU’s new “Green Policy” to reduce the environmental impact of all types of vessels is generating new Directives that shall affect the Shipbuilding Industry. As a direct consequence, an intense debate has been opened with the participation of all the players involved: the European Commission, Marine Institutions, Shipbuilding Industry, Marine Sector, and Scientific Community. Participation of the authors in the SILENV, BESST, and AQUO projects within the FP7 has permitted noticing that for the complete assessment of the ships’ environmental impact it is essential to introduce the new so-called Noise & Vibration – Full Signature indicator. In addition to the well-known topics of Noise & Vibration (N&V) on board, it includes new ones: Noise Radiated to Harbour and Underwater Radiated Noise (URN) by the ships. Both, but especially the latter (URN) became the most outstanding novelty and the biggest challenge to be technically solved. In this sense, it is essential to know the “Starting Point”: How far is the current European Fleet from the Standard Regulations and from other Directives that will soon be compulsory? And which are the technical reasons and root causes of these deviations? To address these issues within the framework of the SILENV Project, the most recent N&V database compiled with 171 ships from the European Fleet and 12,000 N&V experimental data have been assessed. It became the largest ever N&V database in the marine sector, as well as a complete novelty. Therefore, the results, conclusions and recommendations obtained from it are of paramount importance to support current policies of the EC and other Marine Institutions that focus their efforts on combating the environmental impact of the ships.

scholarly journals Reduction of Underwater Radiated Noise from Ships: New Shipbuilding Challenge. The Vessels "Ramón Margalef" and "Ángeles Alvariño" as Technological References of How to Build Silent Vessels

2014 ◽  
Vol 8 (15) ◽  
pp. 45
Author(s):  
Publio Beltrán Palomo
Keyword(s):  
Marine Fauna ◽  
Shipbuilding Industry ◽  
Radiated Noise ◽  
Acoustic Design ◽  
Marine Life ◽  
Full Compliance ◽  
Underwater Radiated Noise ◽  
New Guidelines ◽  
The Impact ◽  
The Eu

Abatement of noise radiated by all kinds of vessels, and specially Underwater-Radiated Noise, because of its impacton marine life, has become the most outstanding novelty and the most dificult challenge the shipbuilding industryhas ever faced. Hence, the industry seeks to other new solutions to comply with the new guidelines and requirementsthat have been recently introduced and promoted by the EU, marine institutions, and the scientific community. "isnew topic, already studied and solved by the navies because of their strategic requirements, is now in the limelight andall the different aspects are being studied and discussed among the different players mentioned. In this new trend, theappearance of some class notations with “different limits”, assertions such as that the “propeller” is the major noise source,and the absence of consensus among the biological community about what should be the limits (for not affecting marine fauna), it is difficult to define the technological steps that should be followed. Until a consistent agreement is reached, the shipbuilding industry and the naval engineers will be “fighting against a ghost”. Within this “confusing scenario”, this paper is a clear example of how the Spanish shipbuilding industry is moving ahead to reduce the impact of new ships. The dynamic and acoustic design, developed by the authors, of the fishing research vessels “Ramón Margalef” and “Ángeles Alvariño” for the Oceanographic Spanish Institute and the experimental results obtained, in full compliance with ICES N°209 Underwater-Radiated Noise requirements, makes them reference vessels for the construction of “Silent Vessels”.

noiseNet: A neural network to predict marine propellers’ underwater radiated noise

2021 ◽  
Vol 236 ◽  
pp. 109542
Author(s):  
Youjiang Wang ◽  
Keqi Wang ◽  
Moustafa Abdel-Maksoud
Keyword(s):  
Neural Network ◽  
Radiated Noise ◽  
Marine Propellers ◽  
Underwater Radiated Noise

scholarly journals Multi-sensor integration for an assessment of underwater radiated noise from common vessels in San Francisco Bay

2021 ◽  
Vol 149 (4) ◽  
pp. 2451-2464
Author(s):  
Samantha Cope ◽  
Ellen Hines ◽  
Roger Bland ◽  
Jerry D. Davis ◽  
Brendan Tougher ◽  
...  
Keyword(s):  
San Francisco ◽  
San Francisco Bay ◽  
Sensor Integration ◽  
Radiated Noise ◽  
Underwater Radiated Noise

scholarly journals Review of Legislation on Noise and Vibration Regulations in Merchant Ships

2015 ◽  
Vol 157 (A3) ◽  
pp. 135-144
Keyword(s):  
European Union ◽  
Environmental Impact ◽  
The European Union ◽  
Noise And Vibration ◽  
Radiated Noise ◽  
Underwater Radiated Noise ◽  
Board Ship

"This paper aims to describe the evolution of noise regulations for merchant ships over the last four decades, analysing the most important aspects with respect to crew, passengers and exposed populations in cities, in line with the requirements of the European Union to reduce the environmental impact of transport. The paper also analyses the changes in regulations aimed at not only regulating noise and vibration inside the ship, but also noise emitted to the port and underwater radiated noise. We shall also include Classification Societies, given the importance of their standards in ensuring increasing levels of comfort on board ship."

Mitigation of Underwater Radiated Noise Related to Shipping and Its Impact on Marine Life: A Practical Approach Developed in the Scope of AQUO Project

2017 ◽  
Vol 42 (2) ◽  
pp. 373-387 ◽  
Author(s):  
Christian Audoly ◽  
Tomaso Gaggero ◽  
Eric Baudin ◽  
Thomas Folegot ◽  
Enrico Rizzuto ◽  
...  
Keyword(s):  
Practical Approach ◽  
Radiated Noise ◽  
Marine Life ◽  
Underwater Radiated Noise

Noise Control Decision Process for Marine Vessels

2014 ◽  
Author(s):  
Raymond W. Fischer ◽  
Louis M. Pettit
Keyword(s):  
Marine Mammals ◽  
Noise Control ◽  
Regulatory Body ◽  
Noise Levels ◽  
Radiated Noise ◽  
Underwater Radiated Noise ◽  
Sound Levels ◽  
Airborne Noise ◽  
Control Decision ◽  
Marine Vessels

There is a price to be paid to achieve compliance with the acoustic requirements imposed by regulatory agencies. Acoustic requirements typically appear in ship specifications as airborne and/or underwater radiated noise limits as the need to preclude hearing loss for crew members and the need to control sound levels experienced by marine mammals receive more recognition. Recent changes and additions to regulatory body requirements addressing compartment airborne noise and underwater radiated noise can be found in IMO Resolution MSC.337(91) Annex 1 and Annex 2 which state that IMO Resolution A.468(XII) “Code on Noise Levels Onboard Ships” shall take effect on 1 July 2014 for all SOLAS compliant vessels. Thus the airborne noise levels in compartments and at on-deck work stations onboard as-built ships seeking a SOLAS certificate will need to be measured, and must demonstrate compliance with noise limits stated in paragraph 4.2 of IMO Resolution A.468(XII). IMO “Guidelines for the Reduction of Underwater Noise from Commercial Shipping to Address Adverse Impacts on Marine Life” dated 7 April 2014 and agencies such as ICES and DNV have established guidance and/or criteria for control of underwater radiated noise from vessels, and these too are now commonly appearing in ship specifications. Specifications referencing such criteria typically require that compliance be demonstrated by at-sea testing of underwater radiated noise. Making the correct decisions during the ship design process will minimize costs for noise control and will provide a positive return on investment. The process of how best to comply with noise limits while minimizing costs through optimization of noise control treatments and design approaches is discussed.

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