Trans RINA, Vol 157, Part A3, Intl J Maritime Eng, Jul-Sep 2015
aircraft and industrial noise. It considers only industrial sources because the noise emitted by ships is included in this source category.
SIMPYC: The objectives of this project include finding solutions to certain problems arising in relations between the port and the city aimed at establishing a friendlier environment and a functional relationship model, while developing coordination between port activities and the city. These problems are basically: noise pollution, air pollution and environmental impact.
HADA: This project is a tool designed to establish a methodology to control noise levels in Spanish seaports (table 5). As in most ports, the main sources of noise are the movement of metallic parts, road haulage traffic and trains. Ships constitute a medium-low source of noise impact, with the exception of the noise emitted during loading and unloading operations.
Table 5. Summarized inventory of sources of noise around port areas. Inventory of sources of noise around port areas Priority level
List of activities and sources of noise High
Scrap iron (unloading of the ship at the dock and loading from the dock to the truck) Iron and steel products Containers Repairs Shipbuilding Heavy traffic
Medium
Railway noise Port warehouses (depending on the type of goods) General merchandise (non-ferrous metals, wood, paper, plaster …) Dockage of Ro-Ro vessels
Low
Liquid cargo without special facilities Solid cargo without special facilities Petroleum products due to their special facilities
Fishing: sale, ice plant, refrigerators, etc. Passenger ships: ferries, cruise ships
SILENV project [15]: Among other objectives, this
project aims to assess methodologies and criteria for the analysis of the noise ships emit to the outside. One of its goals is to model the propagation of airborne noise to the outside by various types of vessels.
In general, strategic noise maps are obtained by
superimposing the calculated sound fields for each source (ships and other possible contributions). The ultimate goal is to assess the noise levels produced in receptors (population exposed to noise), i.e. the population living near the port.
Figure 2. Histogram distribution of noise in 282 cabins on 15 different ships.
b)
Szuwarzynski et al. [17] studied the distribution of noise in 1,360 cabins on 45 merchant ships, finding that the limit of 60 dB(A) is exceeded in only thirty percent of these, as shown in the following figure 3.
c) Experimental levels in bulk carriers, [18] The table 6, was obtained by measuring noise levels in fourteen ships of the same size and type (bulk carriers), built in the same shipyard, with the same propulsion engine, machinery and accommodation
a) Nilsson [16], measured existing levels in 282 cabins on
15 vessels chosen at distribution shown in the following figure 2:
As can be seen, the recommended level of 60 dB(A) is exceeded in two thirds of the cabins.
random, finding the
AQUO Project: The aim of this project is to assess and reduce the underwater acoustic impact from maritime traffic using tools to detect, predict and reduce ship radiated noise.
4. ANALYSIS OF NOISE LEVELS IN DIFFERENT TYPES OF SHIPS
After nearly four decades of developing regulations regarding shipboard noise, it hearing
is our opinion that the health of seafarers is still not adequately
protected. Nonetheless, ships classified by companies belonging to IACS are in a better situation because of the higher technical requirements of this organization, which include not only limits to noise and vibration levels, but also sound insulation and impact sound limits. The additional requirements on noise emitted to the outside set by the European Union will favour the reduction in noise on board, and vice versa.
A review of noise levels on board ships measured by different agencies and researchers over the years reveals the following values:
A-140
©2015: The Royal Institution of Naval Architects
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76