GAGGERO , Tomaso

The requirement of better workers' psychophysical health and the wish to guarantee a correct comfort also during work activities, induce to consider the presence of significant pure tones also for the working spaces. However, the current European legislation regarding professional exposure to the noise of the workers, and namely the EU...

The present paper deals with the side effects of propellers cavitation, i.e. pressure pulses and radiated noise. These effects are gaining more and more importance for commercial ships for different reasons. Pressure pulses significantly affect comfort onboard, thus their reduction is of utmost importance for all ships carrying passengers. As...

One of the aims of the SILENV project, funded by the E.U. within the 7FP, was the development of prenormative requirements regarding the impact of shipradiated noise into three different environments: onboard the vessel and outside it, in air and in water. The paper describes the background of the new formulations which generally take into...

The problem of noise annoyance on board ships has been addressed since a long time. The first document setting limits on onboard noise was the "Code on noise levels on board ships", issued by the International Maritime Organisation in 1981. More recently all the major Classification Societies introduced in their requirements the so called...

Achieving the right balance between fixed and operating costs is a key but non-trivial task for optimizing the characteristics of a fleet of ships for a new trade at a very early stage of the design. A wide range of design choices as well as a significant number of uncertainties related to the operation of the fleet affects those two expense...

A numerical investigation of the impact of the speed reduction achieved by pitch or propeller Revolutions Per Minute (RPM) variations on propeller performances is proposed. A test case is selected from the European Project AQUO, for which experimental data are available. Numerical self-propulsion analyses are carried out to assess the...

A statistical analysis of noise can play an important role in evaluating the performances of an acoustic system working underwater. If the system is either placed on board a vessel or operates nearby passing ships, the noise radiated by the vessel can considerably reduce the performances of the system if it has been not designed to have enough...

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The problem of the impact of airborne noise emitted by commercial ships moored at quay is gaining attention by Regulatory Bodies. The question is often raised by citizens sending complaints to the municipalities of port cities in which the harbour is located inside the town. The problem may be even more important in the case of pleasure crafts...

In the present study, full-scale noise levels measurements on board a Ro-Pax ferry have been carried out in various compartments of the ship, both in stationary conditions (navigation) and during manoeuvres. Noise levels have been surveyed in various categories of spaces located in all decks accessible to both passengers and crew, with the...

Noise on board Ro-Pax vessels is an increasingly important evaluation factor for ferries and cruise vessels. The available normative framework, albeit well established and developed in the form of Comfort Classes, is based on dB(A) limits for the different spaces on board and is main-ly applied on a voluntary basis. In the present study, an...

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In this paper, the impact of integrating a direct numerical evaluation of the added resistance in waves into the design process is illustrated. The increased power required to the ship advancing in waves for each combination of significant wave height and average period is computed by means of the PDStrip freeware software. The total power...

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The rising concern about the environmental impact of ship noise on the marine fauna recently pushed national and international bodies to face the problem. In the last decade a few mass strandings of cetaceans due to sea trials of navy sonars (Frantzis (1998)), enforced the interest on noise pollution effects on marine mammals. The problem of...