The objective of this paper is to perform a statistical characterization of onboard noise in ships from available data in the literature, classifying the spectral noise measurements by different spaces and ship typologies. A data analysis of experimental measurements in octave bands in the range from 32 Hz to 8000 Hz was developed, classifying the noise in 3 categories based on IMO recommendations: 312 spectra for accommodation spaces (A), 118 spectra for navigation spaces (N) and 147 spectra for work spaces (W); additionally, ship typology was considered: military (326 spectra) and commercial (251 spectra). Relevant aspects were searched, such as high noise levels and low frequency (LF) noise associated with induced vibrations. The results of the analysis show a mean dB(A) noise level of 69 dB(A) and a different distribution regarding the space typology, in which workplaces had a higher mean value and dispersion in comparison with accommodation and navigation spaces. Mitigation of noise in ships is a very important issue and efforts must be made to reduce LF noises and sound pressure levels in general in all onboard spaces. In order to achieve more comfort and safety, the normative framework should be updated and modernized to include more sophisticated noise indicators that take into account quality aspects of the spectrum such as vibrations and tonal components.
Analysis of literature data on shipboard noise
Johan Bocanegra;Davide Borelli;Tomaso Gaggero;Enrico Rizzuto;Corrado Schenone
2020-01-01
Abstract
The objective of this paper is to perform a statistical characterization of onboard noise in ships from available data in the literature, classifying the spectral noise measurements by different spaces and ship typologies. A data analysis of experimental measurements in octave bands in the range from 32 Hz to 8000 Hz was developed, classifying the noise in 3 categories based on IMO recommendations: 312 spectra for accommodation spaces (A), 118 spectra for navigation spaces (N) and 147 spectra for work spaces (W); additionally, ship typology was considered: military (326 spectra) and commercial (251 spectra). Relevant aspects were searched, such as high noise levels and low frequency (LF) noise associated with induced vibrations. The results of the analysis show a mean dB(A) noise level of 69 dB(A) and a different distribution regarding the space typology, in which workplaces had a higher mean value and dispersion in comparison with accommodation and navigation spaces. Mitigation of noise in ships is a very important issue and efforts must be made to reduce LF noises and sound pressure levels in general in all onboard spaces. In order to achieve more comfort and safety, the normative framework should be updated and modernized to include more sophisticated noise indicators that take into account quality aspects of the spectrum such as vibrations and tonal components.
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