Research On Vibration And Noise Comfort Of Polar Cruises

Polar cruise ships have long routes and travel in a wide range of seas.It will inevitably encounter extreme sea conditions during the voyage.As a luxury marine vehicle,cruise ships have higher requirements for the comfort of navigation vibration and noise than other ships.The severe polar sea conditions will have an important impact on the navigational safety of polar cruise ships and the vibration of the hull,which in turn will affect passenger comfort experience.It is of great significance to study the impact of polar sea conditions on cruise ship comfort and to improve the comfort quality of polar cruise ships.Compared with cruise ships on other routes,polar cruise ships have to cross a large area of ??ice.The impact of polar cruise ships and ice on the vibration and noise comfort of cruise ships is the focus of this study.This paper takes a cruise ship as the research object,establishes an analysis model of the polar cruise ship,analyzes the influence of northern ice load on the cruising comfort of the cruise ship,and studies the sound insulation performance of the soundproof door to improve the environmental noise of the cruise cabin.The main research contents and conclusion as below.First,the establishment of the sea ice material model and the determination of model parameters are studied.The mechanical properties of sea ice are incredibly complex,and the sea ice material model will directly affect the subsequent ice load simulation results.To accurately determine the material model parameters of sea ice,this paper uses sea ice uniaxial compression and triaxial compression experiments to assess sea ice Material model and parameters.Some scholars have studied using the JH-2 material model to simulate the destruction of sea ice.Still,there is a lack of a systematic method to determine the JH-2 sea ice material model.Based on previous studies,this paper focuses on the analysis of the physical significance of each parameter when the JH-2 model is used to simulate sea ice and its determination method,and the numerical simulation results and experimental results of the loading force obtained using this model are carried out.In comparison,the results show that the loading force on sea ice gradually increases with time,and suddenly drops to zero after reaching the maximum value.The numerical simulation results of the model are consistent with the experimental results,and the sea ice destruction time obtained by the numerical simulation is very close to the experiment.Secondly,the effect of ice load on the vibration and noise of polar cruise ships is studied.The traditional finite element method uses the element deletion method to simulate the destruction of the material.The calculation result is greatly affected by the element deletion standard and cannot reproduce the fracture failure of the actual material well.In this paper,the smooth particle Galerkin method is used to simulate the destruction process of sea ice based on the mechanism of strain failure.This method has the advantages of being insensitive to the failure criteria used by the material and considering the self-contact of the failed unit.In this paper,the smooth particle Galerkin-Finite Element Coupling method is used to model sea ice,and based on this coupling model,the destruction of sea ice is analyzed.Then,based on the coupled sea ice model,the effect of ice load on the vibration of polar cruise ships was studied,and the impact of the floating floor on improving the navigation comfort of polar cruise ships in the ice area was reviewed in conjunction with statistical energy method.The results show that during the collision between the cruise ship and the ice layer,there is no significant crack propagation phenomenon in the sea ice layer.The sea ice damage occurs only in a small area in direct contact with the bow,and no long-distance cracks are generated around and in front of the bow.From the acceleration data of the cruise ship deck,it can be seen that the impact vibration caused by the impact is the largest near the bow,and the acceleration in the bow cabin of the polar cruise ship is significantly attenuated.Finally,the sound insulation performance of the sound insulation door is studied,which is of great significance for improving the noise performance of polar cruise cabins.The sound insulation door can effectively suppress the influence of the air noise generated by the power equipment on the noise performance of the cruise cabin.To improve the sound insulation performance of traditional soundproof doors in low-frequency bands,the embedded quality is applied to the sound insulation door structure to improve the sound insulation performance of soundproof doors in low-frequency bands.By establishing the finite element model of two adjacent reverberation rooms,the effect of embedded masses on the sound insulation of the soundproof door is studied,combined with the evaluation method of the sound insulation performance of the sound insulation door in the low-frequency band,it is useful for affecting the soundproof door in the low-frequency band.Relevant parameters of sound insulation were studied and optimized.The results show that the distance of each mass in the width direction of the sound insulation door and the density of the mass are more relevant to the design goal.For the glass wool studied(thickness 92 mm,bulk density 24 kg/m3),the use of gray cast iron as the mass,and the reasonable arrangement of the size and position of each mass can effectively improve thelow-frequency sound insulation performance of the sound insulation door.Compared with ordinary soundproof doors,the effective sound insulation of Tokita weighted soundproof doors with embedded quality has increased by 5 dB.