Noise Prediction and Control in a Cruise Ship

Abstract

Based on the statistical energy analysis (SEA) method, the noise prediction of the cruise ship’s cabins was analyzed and the results show that the noise energy of the engine room (ER) is the highest in the whole cabins, and the energy propagates in the direction of the ship’s bow and stern with the ER centered. In order to reduce the noise of the ER, the main characteristics of the noise source were analyzed. The contribution rate of each noise source to the ER and the input power of the diesel engine structure-borne and air-borne noise to the ER were analyzed and calculated. The analysis shows that air-borne noise of diesel engine is the main noise source in the ER. Then the acoustic enclosures were applied to the diesel engine to control air-borne noise and the sound insulation effect of the acoustic enclosure under different working conditions was studied. The results shows that in the case of only considering the air-borne noise of the diesel engine, the sound pressure level(SPL) of the ER is reduced by about 36dB(A)∼62dB(A). In the case where all excitations are loaded, the SPL of the cabin is reduced by an average of about 10.8dB (A), which shows a better sound insulation effect.