Abstract：A simplified finite element method (SFEM) was established to calculate the acoustic characteristics for the periodic axisymmetric local resonant scatter structure. The influence of cross-section shape, core material and coating thickness on sound absorption was discussed. The sound absorption mechanism was analyzed through the displacement and energy dissipation density fields. It shows that the sound absorption peaks are caused by the resonances of the scatter. The first and second sound absorption peaks are closely related to the resonance of core and coating respectively. The average sound absorption coefficient was optimized by genetic algorithm while considering the variable cross-section parameters. The optimized results show the variable cross-section scatter can excite more matrix movement at the sound absorption peaks, promoting more wave mode conversion which is conducive for energy dissipation and improving the sound absorption. So it provides a new idea for low frequency broadband sound absorption structure design.
罗英勤，楼京俊，张焱冰. 内嵌局域共振型散射体结构的低频吸声性能研究[J]. 振动与冲击, 2022, 41(8): 86-92.
LUO Yingqin，LOU Jingjun，ZHANG Yanbing. A study on low frequency sound absorption performance of structure embedded local resonant scatters. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(8): 86-92.
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