In this paper,particle swarm optimization(PSO)was used to fit the non-acoustic parameters in the JCA(Johnson-Champonx-Allward)model,and as a basis for the improvement direction of porous sound absorb-ing materials,the average absorption coefficient of porous sound absorbing materials was increased from 0.51 to 0.85.The experiment shows that:after optimization,in the noise reduction project of air conditioning unit in a gymnasium building,the night noise in the sensitive building is measured,and the noise is reduced from 61.6dBA to 48.6dBA,and the effect of noise reduction and rectification is achieved.
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