Optimization design of acoustic labyrinth structure based on acoustic black hole
Here,by combining theoretical calculation,finite element simulation and experimental measurement,an optimization design method for acoustic labyrinth structure based on acoustic black hole was studied,and a small-size,broadband sound absorbing structure with 5.01 and 7.75 octave bands was given.Firstly,based on the transfer matrix method,the mathematical model of acoustic black hole was established,and the reflection coefficient of acoustic black hole was calculated.The theoretical calculation results were compared with the finite element simulation results.Then,based on admittance variation law of acoustic black hole,single side branch tube and double-side branch tube acoustic labyrinth structures were designed,and through optimized design,matching of labyrinth structure and acoustic black hole admittance was realized.Finally,based on matching results of acoustic labyrinth structure admittance,the simulated annealing algorithm was used to construct the optimized model,and obtain a small-sized acoustic labyrinth structure with broadband sound absorption.3D samples were printed for experimental verification.The study results showed that a double-side branch tube acoustic labyrinth is used to replace annular cavity in acoustic black hole pipeline,side branch tube acoustic labyrinth's admittance and acoustic black hole admittance can realize perfect matching with optimized design,small-sized structural design can be realized under the premise of keeping sound absorption performance unchanged;the effective sound absorption bandwidth of the optimized structure is 13.36 times that of before optimization,and the octave band is 3.64 times that of before optimization.
acoustic black holeacoustic labyrinth structuretransfer matrixfinite elementexperimental measurementreflection coefficient
万方数据
维普
