Cabin Noise Prediction And Acoustic Design Of Medium Luxury Cruise Ship

As the best integration of technology and process,luxury cruise ship is the field in China’s high-tech ships that has not achieved breakthrough.In order to break the monopoly of foreign industry,it is urgent to carry out the research on luxury cruise.Cruise ship is a high-end passenger ship designed for tourism which has higher requirements on NVH(Noise Vibration Harshness)performances,so it is necessary to evaluate noise level in the ship design stage and adopt scientific acoustic design to control noise pollution.In this paper,the following research works are carried out on the cabin noise of medium-sized luxury cruise ships.First of all,we research the basic theory of the numerical prediction method of the cabin noise which included statistical energy analysis(SEA)and Hybrid Finite element-Statistical energy analysis(FE-SEA).Two methods are used to forecast the noise level of the cabin rooms of the medium-sized luxury cruise ships.SEA forecast the full cabin noise and discuss the scientificity of the simplified model.By referring to other ship types,we propose the interior and insulation arrangement of the whole ship and the influence of the flow-induced noise is added.FE-SEA forecast the cabin noise and discuss the limitation of the ship’s middle frequency noise analysis,and propose a hybrid model subsystem partition method.Secondly,on the base of damping suspension,sound absorption and insulation,the study of cabin noise control technology research and sound package optimization was carried out.Through the contribution analysis of noise sources,the main source of noise of the cabin was identified.Based on the description of the shortest path problem in the theory of analog graph,the model of ship structure noise transmission path analysis is established.Based on the thought of shortest path algorithm,we write a program to find the first k transfer paths from the main source to the target cabin and propose a method of damped noise reduction based on critical nodes.Establish the simulation model of measuring sound absorption coefficient in impedance tubes and sound insulation in reverberation which are used to simulate the sound absorption coefficient of porous acoustic material and the sound insulation of ship bulkhead structure.Furthermore,we choose the optimal acoustic package of controlling the noise of mid-sized luxury cruise ship cabin to achieve the optimization of acoustic package design.We propose the noise comprehensive control scheme of ship cabin and evaluate the noise reduction effect.In the end,we establish a finite element modal based on the modal of superstructure cabin which is affected by the noise of air-conditioning ventilation system.In the meantime,we consider the influence of interior furniture layout in the cabin and discuss the effects and reasons for the format various factors on noise reduction to the field points,such as wall,corner,thickness and species of materials.We establish a statistical energy model of typical restaurant and analyze the structural air noise caused by vibration of external mechanical equipment.Furthermore,we evaluate noise objectively and discuss the effect of acoustic packet configuration location on regional noise reduction and its causes.Futhermore,we propose the configuration recommendations of the sound package in the cabin and provide guidance for cabin acoustic design.