Primary aim of the study is to better knowledge about the outdoor ship noise process in order to propose appropriate actions for reducing noise emissions in the environment and new uniform criteria and limits for noise radiated by ships into the harbours of European Union. To attain this purpose, first of all, designers need to individuate all the ship’s noise sources and to establish and define an appropriate measurement procedure for quantifying noise radiated to harbour. After this, noise generated in open field conditions by different ships should be measured in order to create a specific database of the actual noise levels in harbours. A deeper knowledge of the actual noise pollution in European harbours should allow to establish appropriate noise limits consistent with the current technology and in accordance with people health. Furthermore, the scientific community has to determine the computational tools which should allow designers to predict outdoor noise of ships during design phase. In this report, a new operative procedure elaborated at the University of Trieste is presented. The study has been developed by taking advantage of experience gained on the subject by the Noise and Vibration Department of Fincantieri SpA. In the following, a brief introduction is given: basics about ship’s noise sources in Chapter 2, fundamental principles of theoretical methods for dealing with noise field generated by ships in Chapter 3, and computational tool selected for carrying out simulations in Chapter 4. In Chapter 5 each step of the proposed procedure is presented in detail and all assumptions at the basis of the operative flow chart and of the numerical model are justified. Finally, a case study, which has been carried out on a passenger ship in harbour, is discussed in detail in Chapter 6. Suggestions for a proper use of the method and guidance on how to interpret simulation outputs in the post-processing phase are given in the same chapter. General conclusion and suggestions for future work close the report in Chapter 7.
Outdoor Noise Generated by Ships: Identification of a procedure for prediction of outdoor ship noise in harbour
MORO, LORENZO;BIOT, MARCO
2010-01-01
Abstract
Primary aim of the study is to better knowledge about the outdoor ship noise process in order to propose appropriate actions for reducing noise emissions in the environment and new uniform criteria and limits for noise radiated by ships into the harbours of European Union. To attain this purpose, first of all, designers need to individuate all the ship’s noise sources and to establish and define an appropriate measurement procedure for quantifying noise radiated to harbour. After this, noise generated in open field conditions by different ships should be measured in order to create a specific database of the actual noise levels in harbours. A deeper knowledge of the actual noise pollution in European harbours should allow to establish appropriate noise limits consistent with the current technology and in accordance with people health. Furthermore, the scientific community has to determine the computational tools which should allow designers to predict outdoor noise of ships during design phase. In this report, a new operative procedure elaborated at the University of Trieste is presented. The study has been developed by taking advantage of experience gained on the subject by the Noise and Vibration Department of Fincantieri SpA. In the following, a brief introduction is given: basics about ship’s noise sources in Chapter 2, fundamental principles of theoretical methods for dealing with noise field generated by ships in Chapter 3, and computational tool selected for carrying out simulations in Chapter 4. In Chapter 5 each step of the proposed procedure is presented in detail and all assumptions at the basis of the operative flow chart and of the numerical model are justified. Finally, a case study, which has been carried out on a passenger ship in harbour, is discussed in detail in Chapter 6. Suggestions for a proper use of the method and guidance on how to interpret simulation outputs in the post-processing phase are given in the same chapter. General conclusion and suggestions for future work close the report in Chapter 7.Pubblicazioni consigliate
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