Design And Evaluation Of The Sound Insulation Structure On The Wall Of The Marine Reverberation Pool

Transportation vehicles has produced numerous marine,caused a lot of noise radiation,and caused pollution and damage to the marine ecological environment,which has attracted international attention.Therefore,how to accurately measure and evaluate ship radiated noise has become a difficult problem.Using reverberation method to measure ship radiated noise,although the cost is low,the accuracy is high and the cycle is short,the construction cost of conventional large reverberation pool is high,and the construction quantity is large.In order to promote the application of reverberation method in the measurement of ship radiated noise,this paper proposes to establish a marine reverberation pool in the coastal waters by using sound insulation wall method,and use reverberation method to measure ship radiated noise.This paper mainly studies the design of underwater sound insulation structure,so that it can meet the application of sound insulation wall of marine reverberation pool,and evaluates the sound insulation effect of sound insulation structure.In this paper,the acoustic insulation capacity of infinite single-layer homogeneous plate and double-layer plate structure in water is derived by using the wave transfer method,and the acoustic insulation characteristics of single-layer plate and double-layer plate structure are analyzed.Using the numerical calculation software Virtual.Lab Acoustics and the acoustic finite element method,this paper studies the underwater sound insulation performance of single-layer board,sandwich board and water tank structure,and draws a conclusion that the air sandwich board structure has better underwater sound insulation performance.In order to further verify the simulation results,this paper designed a test scheme,and used difference method and reverberation method to test the actual sound insulation effect of air sandwich plate water tank in non-anechoic pool.The experimental results show that the sound insulation values obtained by the two methods are in good agreement with each other,and the difference is no more than 2-3 d B at high frequency.The experimental results are in good agreement with the simulation results,which indicates the correctness of the simulation and test methods in this paper.Through the simulation and test results,it can be concluded that the air sandwich panel structure has excellent sound insulation performance under water,and can be used as the wall material of reverberation pool at sea for practical application.