Analysis Of Vibration And Noise Reduction Performance Of Typical Marine Sandwich Panel

Ship and ocean engineering equipment to the large-scale,complicated,at the same time,the state of extreme development of people is becoming more and more high to the requirement of structure safety and comfort,traditional hull panel steel structure have been unable to meet the needs of its safety,comfort and functional,so the new material and new structure form has become an important way to improve the performance of hull structure.Sandwich panel structure,as a new type of structure,has the advantages of light weight,high specific strength and strong functional design.It has attracted extensive attention abroad and has been gradually applied in aerospace,high-speed railway,ship and other fields.However,domestic research on the application of sandwich panel structure in the field of marine and ocean engineering is still in the initial stage,and systematic and in-depth research work should be carried out to improve the level of design and development in the field of marine and ocean engineering in china,and to enhance the comprehensive performance of marine and ocean engineering equipment.In this thesis,two types of typical sandwich panel structures,SPS sandwich panel and folded structure sandwich panel,are taken as the research objects,and the vibration characteristics and sound insulation performance of the sandwich panel applied to ship structure are systematically studied.Firstly,based on the traditional stiffened panel,the alternative scheme of SPS sandwich panel and folded structure sandwich panel is formed based on the relevant design principle,and the size parameters of the relevant structure are determined.Based on this,the vibration and sound insulation characteristic tests of SPS sandwich panel structure were designed and carried out,and the natural frequency,mode pattern,amplitude-frequency response curve and sound insulation curve of the structure were obtained.On this basis,the correlation simulation analysis was carried out,and the results were compared with the test results to verify the improvement of the simulation analysis technology.The influence of structural geometrical parameters and external excitation factors on the vibration and sound insulation performance of SPS sandwich panel and U-type folded structure sandwich panel was systematically analyzed by using finite element simulation method.In addition,the vibration and sound insulation characteristics of SPS sandwich panel and folded structure sandwich panel are also discussed,and compared with traditional marine stiffened plate.Specific contents include:(1)Based on the traditional marine stiffened plate structure as the reference object,the alternative design scheme of SPS sandwich panel and folded structure sandwich panel was determined based on the relevant alternative design principles,and the mechanical properties of the sandwich plate under static load were compared and analyzed,which laid a foundation for the follow-up research.(2)The vibration and sound insulation tests of SPS sandwich panel structure were carried out,and the vibration characteristic parameters,such as natural frequency,mode pattern and amplitude-frequency response,as well as acoustic characteristic parameters,such as sound insulation,were obtained.Based on this,the relevant numerical simulation was carried out and compared with the experimental results to verify and improve the simulation analysis technology.(3)The vibration and sound insulation performance of SPS sandwich panel and folded structure sandwich panel were studied.The natural frequency,mode pattern,displacement amplitude-frequency response curve and sound insulation curve of SPS sandwich plate and folded structure sandwich panel were compared with that of traditional stiffened panel,so as to provide reference for the replacement application of typical marine sandwich panel.(4)The influences of panel geometry parameters,mass ratio of panel and core layer,core geometry and core material on the natural frequency,amplitude-frequency response and sound insulation performance of SPS sandwich panel and U-type folded structure sandwich panel are systematically analyzed by using the finite element method,which provides a reference for the alternative design of vibration and noise reduction of sandwich panel.