Simulation And Experiment Of Sound Absorption Barrier Based On Silicate Porous Material

In recent years,to have noise proof wall can be one of the effective and low cost methods on solving the problems of railway noise.Noise barrier has been widely accepted and applied in the field of railway noise reduction investigation.Due to the gradual improvement of noise reduction requirements,which hinders the sound barrier from working as effectively in high-speed railway.The author has carried out works as follows,the article applys the computer aided software to discuss the acoustic and mechanical properties of the sound barrier.Mostly the noise reduction effect of a kind of inorganic non-metallic porous sound-absorbing material for noise barriers is discussed.And the simulation results are verified by experiments.(1)A high-speed railway subgrade model was established using ANSYS and further simplified according to reasonable assumption.Based on boundary element theory,simulation analysis on high-speed railway noise barriers of different height,different thichness of sound-absorbing materials and structures were conducted and suggestions of improving the noise reduction effect were proposed.Discussing the noise reduction performance of silicate porous sound-absorbing materials to noise barrier.The research shows,changes only in acoustic structure will not prominently lesd to noise reduction efficiency of spectrum,absorptive materials structure added will greatly improved the efficiency.(2)Based on the acoustic barrier solid finite element model established by ANSYS,according to the characteristics of the railway subgrade sound barrier,selects the C40 plain concrete material ae the sound barrier suit material,and analyze the influence of wind load on the structure of railway subgrade.Regarding the embankment sound barrier structure,discussed the column different burying depth separately,the barrier thickness of slab and sound-absorbing material to the barrier crown displacement quantity and the stress,the shearing stress,along with column’s burying depth deepening,the crown displacement quantity reduces,the stress and the shearing stress reduce.The barrier thickness of slab and sound-absorbing material increases,its crown diaplacement quantity also correspondingly reduces.(3)The preparation process of silicate porous sound-absorbing materials is introduced,changes in law of the sound absorption properties of porous materials is analyzed.The results shows,the simulation results of the noise reduction performance of silicate based sound barrier and experiment data is consistent.Considering the characters of high-speed railway noise,the spatial sound pressure level distribution with consideration of acoustic reflection from the train was investigated and considered,which improved the accuracy and rationality of simulation analysis and further providing reliable reference for the acoustics designing and application of high-speed railway sound barriers.At the same time,the mechanical properties of the sound barrier structure are analyzed by the finite element software,which provides a reference for the design of the mechanical properties of the railway noise barrier.