摘要
为在低厚度限制内有效实现低频宽带吸声并获得高耐静水压力,提出了厚度在40 mm以内的多元胞并联耦合吸声覆盖层结构。该结构有多个不同结构的吸声单胞,吸声单胞由橡胶和金属组成。结合有限元法与遗传算法,确定了多元胞吸声覆盖层结构的最佳尺寸参数。结果表明:该吸声覆盖层在510 Hz~10 kHz频段内吸声系数均匀分布,平均吸声系数超过0.96。从位移场及能量耗散功率分布,以及等效声阻抗匹配的角度,解释了协同耦合引起的宽带吸声机理。不同的单胞结构与尺寸会影响单胞内的结构振动以及波型转换效率,利用各单胞在不同频率段上吸声系数的互补性可有效拓宽吸声带宽。
In order to effectively achieve low-frequency broadband sound absorption and obtain high hydrostatic pressure resistance within low thickness limits,a multi-cell parallel coupling anechoic coating structure with a thickness of less than 40 mm is proposed.The structure has several acoustic cells with different structures,and each acoustic cell consists of rubber and metal.The optimal size parameters of the multi-cell anechoic coating structure were determined by combining the finite element method and genetic algorithm optimization.It achieves a broadband sound absorption effect in which the sound absorption coefficient is evenly distributed from 510 Hz to 10 kHz frequency band,and the average sound absorption coefficient exceeds 0.96.From the perspective of displacement field,energy dissipation power distribution,and equivalent acoustic impedance matching,the mechanism and characteristics of broadband sound absorption caused by cooperative coupling are explained respectively.The results show that different structures and sizes between unit cells will affect the structural vibration and wave mode conversion efficiency within the unit cell.The sound absorption strength of each unit cell at different frequency bands is used to complement each other,and combined with optimization methods,the sound absorption can be effectively broadened bandwidth.
作者
杨将政
应童
李钊宇
陶猛
YANG Jiangzheng;YING Tong;LI Zhaoyu;TAO Meng(School of Mechanical Engineering,Guizhou University,Guiyang 550025,Guizhou,China)
出处
《陕西师范大学学报(自然科学版)》
北大核心
2026年第2期110-116,共7页
Journal of Shaanxi Normal University:Natural Science Edition
基金
国家自然科学基金(52265010)
贵州省科学技术基金(黔科合基础[2020]1Z048)。
关键词
协同耦合吸声
遗传算法
水下声学
宽带吸声
synergistic coupling sound absorption
genetic algorithm
underwater acoustic
broadband absorption
