Study On Fine Prediction Of Noise In Polar Ship Cabin

Due to the large temperature difference between the inside and outside of the polar ship,water droplets or ice crystals are easily condensed in the outfitting material,which changes the porosity,flow resistance,and pore medium of the outfitting material,and changes the sound absorption/insulation performance of the outfitting bulkhead,thus affecting the cabin noise level.In addition,the bulkhead pore and the acoustic barrier will also change the sound insulation performance of the bulkhead and noise propagation paths,and affect the sound pressure level distribution of the cabin sound field.However,numerous traditional cabin noise prediction methods do not consider the influence of temperature and humidity environment,bulkhead porosity,as well as a sound barrier on cabin noise level,which leads to some deviation between some cabin noise prediction results and the actual situation.Therefore,this study focuses on the insufficient precision of noise prediction and protection design of polar ship cabins,and plumbs the influence of temperature and humidity environment,bulkhead porosity,and sound barrier on ship cabin noise in the polar area,to provide methods of support for cabin noise precise prediction and protection design in polar ships.Firstly,this paper collected the analysis methods and research achievements of domestic and foreign scholars in cabin noise prediction,summarized the current research status of noise prediction and protection of polar ship cabins,pointed out the limitations of relevant research,and then led to the main research content and direction of this paper,which laid the foundation for the follow-up work.Secondly,analyzes the influence of the temperature and humidity environment on the ship cabin noise,by conducting an acoustic impedance tube test and outfitting ratio section test explores the temperature and humidity environment on the ship outfitting material absorption /sound insulation performance and cabin noise level,and for the subsequent pole zone ship cabin noise fine forecast provides the measured parameter input.Thirdly,the refined prediction analysis method combining statistical energy analysis method and boundary element method is determined,and the factors such as temperature and humidity environment and cabin pore are added,the refined prediction analysis process of polar cabin noise is proposed,and the validity is verified through the ratio section test and theoretical calculation.Based on the above methods,the influence of bulkhead pores and sound barriers on the sound field distribution and cabin noise characteristics are explored,which provides support for the subsequent fine prediction of ship cabin noise in the polar area.Finally,taking a cruise ship in the polar region as the research object,a series of input parameters were obtained by taking into account the polar environment and bulkhead porosity,and a refined prediction and analysis model of polar ship cabin noise was established based on statistical energy analysis and boundary element method.According to the forecast results,the dominant component and spectrum characteristics of the noise in the target cabin were analyzed,the weak link of noise protection was determined,refined protection measures were initially proposed and the protective effect was analyzed and evaluated to ensure that the noise level of the target cabin was in line with the standard and there was no risk of exceeding the standard.