摘要
基于声学坐标变换理论,提出并设计了一种结构简单、可宽带工作的声波诱导装置。对缩减声成像机理分析,推导理论媒质的等效声学参数,并对所得参数进行数值计算,以验证该机理的合理性和有效性。根据等效媒质理论,借鉴自然物质由原子构成的特性,采用声学超材料方法,设计装置的声防护功能,获得由超材料单元阵列构成的具有真实材料参数的声波诱导装置结构。对该装置整体结构开展全波数值仿真,提取其在声波作用下的总声压场和远场声散射方向分布等特征参数,并通过对比分析验证该装置的功能效果。结果表明,所提出的装置可在3500 Hz~5500 Hz频率范围内有效缩减探测声波的散射截面,实现预期的声波诱导效应。
A structurally simple,broadband-operating sound wave induction device is proposed and designed based on the theory of acoustic coordinate transformation.First,the mechanism of reduced acoustic imaging is analyzed,and the equivalent acoustic parameters of the theoretical medium are derived.Numerical calculations are performed on the obtained parameters to verify the feasibility and effectiveness of the proposed mechanism.Next,based on the equivalent medium theory and inspired by the characteristics of natural material composed by atoms,an acoustic meta-material approach is employed to design the acoustic shielding function of the device.As a result,a sound wave induction device structure composed of an array of meta-material units with real material parameters is developed.Full-wave numerical simulations are conducted on the overall structure of the device to extract such characteristic parameters as the total sound pressure field and far-field scattering distribution under the action of sound waves.The comparative analysis is used to validate the functional effect of the device.The results demonstrate that the proposed device can effectively reduce the scattering cross-section of detection sound waves within the frequency range from 3500 Hz to 5500 Hz,achieving the expected sound wave induction effect.
作者
宋海
周晓玥
李健
SONG Hai;ZHOU Xiaoyue;LI Jian(North Information Control Academy Group Co.LTD,Nanjing 211100,China)
出处
《火力与指挥控制》
北大核心
2025年第9期176-182,共7页
Fire Control & Command Control
关键词
声波诱导
变换声学
声学超材料
声散射缩减
sound wave induction
transformation acoustics
acoustic meta-material
acoustic scattering reduction
