Scholarly record
AN ANALYSIS OF THE SOUND LEVEL ON TWO ROMANIAN CARGO SHIPS TRAVELING ON THE DANUBE RIVER
Abstract
Aboard a ship, the noise is a sum of several factors: equipment (engines, propellers, compressors), and the waves (if the Danube is very hectic), etc. The noise leads to discomfort for the crew. This paper studies the noises on 2 river vessels traveling on the Danube between Sulina and Budapest, in February and April 2019. The noises were measured with Blue Solo sonometer and analyzed with dBTRAIT Software. The determinations were made while running, in the engine room and in the control room. To check the noise level, we have chosen 2 methods: 1) the graphical representation of the variation in time of the sound level, as well as the frequency analysis of the sound and 2) exposure of subjects by calculating "Exposure points per task and per hour". With method 1, the analysis done with dBTRAIT Software shows that for both vessels the maximum value of the sound level in the engine room is in the range 99-105dB(A), even if the frequencies are 560; 800 and 2500Hz. Regarding the maximum value of the sound level in the control room, it is 95-97dB(A), for frequencies of 315; 400; 1600 and 2500 Hz. It is found that the maximum noise is kept at very close values, regardless of its frequency, as well as the time of analysis. Method 2 uses the Daily Noise exposure calculator?HSE: the sound level could be calculated for certain periods, as well as the number of exposure points for each individual case. Exposure points can be used to prioritize noise control because it links the value of the sound level with the exposure time. From both measurements and calculations, it is found that the admissible sound level is exceeded by 31.7% in the engine room for ship 1 and by 28.2% for ship 2. As for the control room, the admissible sound level is exceeded by 16.4% for ship 1 and by 22.3% for ship 2. Also, it was found that there are no differences between the levels of noise in the periods of low and high temperatures. These ships must enter into capital repairs or if it is possible, a renewal of the fleet of ships should be done.
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References11
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