Simulation And Analysis Of Acoustic Properties Of Porous Metallic Materials Based On COMSOL Multiphysics

Porous metal materials have excellent properties such as energy absorption and buffering,and are widely used in many fields such as aviation industry,deep sea engineering,and environmental protection engineering.The paper studies the acoustic properties of porous metal materials under high temperature and high sound pressure,improves the acoustic performance test bed of existing porous metal materials,conducts experimental research,and uses COMSOL software to perform acoustic performance of porous metal materials under multi-physics.Firstly,the basic theory of high-temperature sound absorption of porous metal materials was studied and summarized.Based on the size of the existing laboratory test bench,a two-dimensional geometric model was built using COMSOL software.Different porous acoustic models were added to the physical model,and the simulations were analyzed.The sound absorption coefficient curve and the sound absorption coefficient curve obtained from the experiment have initially improved the acoustic performance test bed of porous metal materials and improved the experimental process.Secondly,based on the basic differential equations such as the solid heat transfer equation,the fluid heat transfer equation,and the radiation equation,a three-dimensional simulation model was established using COMSOL software.The heat transfer of the test rig was studied using steady state,and the data measured by the actual test rig were used.In contrast,the simulation results of the model under the same experimental conditions have certain reliability.Finally,the preliminary development and application of two modules,"porous medium heat transfer" and "pressure acoustics,frequency domain" in COMSOL software,were used to build a new three-dimensional simulation model based on the dimensions of the laboratory's improved test bench.After confirming that the heat transfer simulation results and test results are within the allowable error(8K),the sound field inside the porous metal material and inside the test bench(impedance tube,test tube)was simulated and the simulation results were compared with the COMSOL case database.The existing results were compared and analyzed to determine the rationality of the simulation.