Research On Noise Prediction And Control Of Ship Cabin

Ship noise not only adversely affects the work and rest of the crew and passengers,but also has bad effect on the normal operation of the marine equipment.Compared with the control of the noise after the ship is built,the noise reduction design can achieve better results in the design stage.Therefore,in the ship design stage,the ship should be subjected to noise prediction and noise reduction design.Taking the drilling auxiliary barge as an example,the statistical energy analysis method is used to forecast the cabin noise.And in the paper,the main noise transfer path and noise control method are studied.The main research contents and conclusions of this paper are as follows:(1)Establish a statistical energy model for ships and predict cabin noise.The influence of the damping loss factor on the forecast results is analyzed.It is concluded that the damping loss factor of the steel structure has a great influence on the noise prediction result,and the wall sound absorption coefficient has little influence on the noise prediction result.(2)In order to control the noise more effectively,the main transfer path of the noise is solved and analyzed.The existing methods for solving the noise transmission path includes the loss factor weighting method and the sound vibration entropy weighting method.By comparing the two solutions,it is concluded that the loss factor weighting method is more applicable,and the acoustic vibration entropy weighting method is only suitable for solving the noise transmission path of a single type subsystem.(3)Use the loss factor weighting method to calculate the main transfer path of noise,then analyze the transmission law of structural noise and air noise,and obtain that the transmission of noise in the middle and low frequency bands is concentrated.Through the solution of the main path,the key nodes in the noise transmission are obtained,and the noise control of the key nodes can be verified to achieve better noise reduction effect.(4)Research on noise control methods.Firstly,the noise of the sound source is controlled,and the components of the noise source are analyzed.The noise source are controlled by the sound insulation and vibration isolation methods respectively,and the expected effect is obtained.Secondly,the sound insulation performance of common composite sound insulation structure is analyzed,and a better sound insulation structure is obtained.Finally,the multiobjective optimization method is used to optimize the structure,which verifies the effectiveness of the multi-objective optimization method.The research results of this paper have certain reference value for the selection of damping loss factor in the subsequent noise prediction,the analysis of the main transmission path and the optimization of noise reduction.