Calculation of Acoustic Parameters of Aluminum Foam and its Application
Acoustic parameters of aluminum foam,such as tortuosity factor,thermal characteristic length and viscous characteristic length,have important effects on its sound absorption ability.To solve the problem that the acoustic parameters of aluminum foam are difficult to be measured in the laboratory,this paper studies the use of Johnson-Champoux-Allard po-rous medium model and global least squares optimization method to complete the reverse calculation of acoustic parameters of aluminum foams.By mutual comparing of the measured values of sound absorption performance of aluminum foams pre-pared by melt foaming method,the feasibility of the proposed method was verified.The effects of acoustic parameters such as airflow resistivity,viscous characteristic length,thermal characteristic length,tortuosity factor and porosity on the sound absorption performance of the aluminum foam were further explored through numerical calculations.The results show that the sound absorption performance of the aluminum foam increases with the increase of airflow resistivity,tortuosity factor and porosity;the change of thermal characteristic length and viscous characteristic length has little effect on the sound ab-sorption coefficient;and with the increase of porosity,the sound absorption performance of aluminum foam is most signifi-cantly improved.This work has provided a reference and guidance for the development,preparation and practical engineer-ing application of aluminum foams.
acousticsaluminum foamporous media modelacoustic parameterssound absorption coefficientnoise reduction coefficient
万方数据
维普
