Study On SEA Simplified Modeling And Noise Reduction Technology Of Luxury Cruise Ship

The prevention of vibration and noise is the key to the structural design of luxury cruise ships,so it is necessary to evaluate the noise level of the whole ship in the design stage of ships,and take reasonable measures to reduce structural vibration and cabin noise.This thesis focuses on the medium-sized luxury cruise as the research object and carries out the following works:The establishment process of the statistical energy analysis model for the medium-sized luxury cruise ship is introduced in detail.According to the actual situations,the structural form of the hull plate and profile is determined,the layout scheme of the interior material is provided,and the main noise sources and their locations in the cabin are given.A simplified modeling method for hull frame structure and cabin acoustic cavity is investigated.The simplified modeling method for the multi-homogeneous plates is provided,and the influence of the position of the internal excitation source on the simplification is analyzed.The results show that the simplification effect is best when the excitation source is located at the symmetry center of the multi-homogeneous plates.It is found that the simplification effect will decrease when different types of boards are connected.The influence of the two simplified modes of merging small cabin into large cabin and merging small cabins on cabin noise level is analyzed.The results show that the noise level of the surrounding cabins is not affected by the merging of small cabins into large one,and the noise level of the upper cabins is seriously affected by the merging of small cabins in the same floor.According to the different mechanism of cabin noise,the measures of vibration isolation,vibration reduction,sound absorption and sound isolation are discussed.Numerical simulation of these four measures was conducted in VAOne software,and the influence of parameters and quantity of vibration isolators on the vibration isolation was analyzed,and the results show that the more the number of isolators,the better the isolation effect is,but the frequency remains the same.The influence of the characteristic difference between the damping layer and the thin plate on the vibration isolation effect was analyzed.The results show that the increase of coverage is not as good as the increase of modulus ratio or thickness ratio.This paper studies the properties of resonant sound absorption structure and porous sound absorption material,the results show that they can effectively reduce the air sound inside the cabin,and the thicker the perforation plate,the lower the perforation rate,the greater the cavity depth,and the lower the sound absorption performance.and studies the sound insulation properties of single and double layer thin plate.The study on sound insulation performance of single and double layer thin plates is presented.The results show that the higher the longitudinal wave velocity and thickness is,the lower the coincidence frequency is,and the better the sound insulation performance is.For the double-layer thin plate,the relation between the sound insulation performance and the distance between the thin plate is complex.Based on the above measures,the comprehensive control scheme of cabin noise is put forward.