Acoustic Characteristic Analysis And Performance Optimization Of Typical Structures Of Ocean-going Passenger Ship

With the improvement of people’s living standards,sea travel is heating up.In recent years,the country has vigorously supported the development of cruise industry.As a kind of large luxury cruise ship,comfort is one of the main indicators of its performance,which puts forward higher requirements on the vibration and noise control of the cabin and public area of ocean-going passenger ship.In this thesis,the sound insulation performance of noise barrier and sound insulation glass structure of ocean-going passenger ship playground and cabin compartment are taken as the research objects,and the sound insulation performance of noise barrier and sound insulation glass structure and the influence law of their parameters were investigated.The main work and conclusions are as follows:The sound insulation performance analysis model of sound barrier was established,and the accuracy of the analysis method was verified.The influence of height and thickness of screen on the sound insulation performance of upright noise barrier was studied,and on this basis,the noise barrier structures of insert type and circular diffuser were proposed,and the influence law of structural parameters on the sound insulation performance of insert type and circular diffuser noise barrier structures was studied.In order to improve the sound insulation performance of noise barrier,top structure is usually set at the top of noise barrier.Based on the principle of acoustic interference,interference noise barrier was proposed and its sound insulation performance was studied.The results show that the interference noise barrier has obvious advantage in the range of200Hz～5000Hz,and the sound insulation performance of the interference noise barrier is improved by 2.7d B(A)than that of the T-type noise barrier.Secondly,the influence of the width of the top structure,the depth of the cavity,the thickness of the plate,the opening direction of the cavity,the contour of the top structure and the arrangement of the plate on both sides on the sound insulation performance of the interference sound barrier were studied.The results show that the sound insulation performance of the sound barrier increases with the increase of the width of the top structure,but the growth rate gradually slows down with the increase of the width.When the cavity depth of the top structure changes,the sound insulation performance is better in a certain frequency range after the interference phenomenon occurs.The thickness of the plate has little effect on the sound insulation performance;the sound insulation performance in the frequency range above 1000 Hz can be effectively improved when the top opening direction is 0°;when the height of the wall plate on the source side is lower than the height of the wall plate on the receiving side,the sound insulation performance of the noise barrier is better;the change of the top structure profile will change the internal sound field,and the sound insulation performance of the noise barrier is better when the bottom width of the structure is smaller than the opening width,which is0.5m,when the bottom width is reduced from 0.5m to 0.1m,the insertion loss of the sound barrier is increased by 1.6 d B(A).In order to further improve the sound insulation performance of interference noise barrier,the micro-perforated plate structure was introduced into the interference noise barrier,and the influence law of micro-perforated plate aperture,plate thickness,perforation rate and cavity thickness on its sound insulation performance was studied,and the influence of installing center dividers in the cavity on the sound insulation characteristics of the noise barrier was investigated.The results show that the insertion loss of noise barrier increases by 1.5d B(A)in the range of 63Hz～5000Hz after installing micro-perforated plate;in the range of63Hz～125Hz,decreasing the aperture diameter,increasing the plate thickness and the cavity thickness behind the plate can improve the insertion loss of noise barrier;in the range of above250 Hz,the insertion loss of noise barrier increases with the increase of perforation rate;after installing center divider,in the range of 63Hz～5000Hz,the insertion loss of noise barrier increase by 1.1d B(A);the sound insulation performance is optimal when the height of the divider is equal to the top structure;when the ratio of the width of the center divider to the width of the two sides of the wall is 1:4,the sound insulation performance of the sound barrier is the best;in the range of 1000Hz～2500Hz,the insertion loss of the sound barrier increases with the increase of the number of center dividers.When center dividers are arranged at different heights,from the sound source side to the receiving point side,the sound insulation performance of the sound barrier is optimal when the dividers are arranged in increasing order.The sound insulation performance of the glass structure of ocean-going passenger ships was studied.The sound insulation performance of double layer and insulating glass structure of ocean-going passenger ships was studied.The effects of laminated material type,thickness and glass combination on the sound insulation performance of double layer glass structure were investigated.The influence law of gas layer thickness,gas type,pressure and temperature on the sound insulation amount of insulating glass was studied.A set of glass structures was designed and processed for sound insulation performance testing.The research results show that when typical viscoelastic polymer is used as the interlayer material for double layer glass,the sound insulation performance of double layer glass is better;in the range of 200Hz～2000Hz,the sound insulation amount of double layer glass increases with the increase of the thickness of the laminated material;different combinations of glass have a greater impact on the sound insulation amount,in the range of 100Hz～1000Hz,the sound insulation performance of the combination of tempered glass and heat-absorbing glass is optimal,in the range of 1000Hz～3150Hz,the sound insulation performance of the combination of tempered glass and tempered glass is optimal,and in the range of3150Hz～5000Hz,the sound insulation performance of the combination of heat-absorbing glass and heat-absorbing glass is optimal;increasing the thickness of the air layer,reducing the pressure and temperature of the gas layer and choosing helium as the gas medium can improve the sound insulation performance of insulating glass;the sound insulation of doublelayer and insulating glass was tested based on the sound intensity method in the reverberationanechoic laboratory.The experimental value of sound insulation is in good agreement with the simulation value in the range of 200Hz～5000Hz,and the error is within the acceptable range.The research content of this thesis can provide a reference for the design of noise barriers and glass structures for ocean-going passenger ships.