【摘要】 为了有效解决亥姆霍兹共振器低频吸声性能不佳的问题，将阵列式延长颈与亥姆霍兹共振结构有效结合，设计了一种高效且具有深亚波长厚度的吸声体.仿真测试结果表明，吸声体的厚度仅为吸收峰频率对应波长的■,展现出深亚波长的吸声特性；共振频率为315 Hz时，吸声体的吸收峰幅值高达0.985,几乎实现了对声能量的完美吸收；吸声体的吸声机理主要是声能量在多个延长颈内壁发生摩擦损耗；阵列式延长颈为吸声体的声阻抗提供了额外的可调性，工作频率和带宽可在较宽频带内灵活调谐；结构参数中，延长颈孔径和管长均显著影响吸声体的吸声性能.该吸声体结构简单、厚度较薄，低频吸声性能佳.更多还原

【Abstract】 In order to solve the problem of low frequency sound absorption of Helmholtz resonator, an efficient wideband sound absorber with deep subwavelength thickness was designed by combining arrayed extended neck with Helmholtz resonance structure.The results show that the thickness of the absorber is only 1/36 of the wavelength corresponding to the absorption peak frequency, showing the sound absorption characteristics of deep subwavelength.When the resonant frequency is 315 Hz, the absorption peak amplitude of the sound absorber is as high as 0.985,which almost realizes the perfect absorption of sound energy.The sound absorption mechanism of the sound absorber is mainly due to the friction loss of sound energy in the inner wall of multiple extended necks.The arrayed extended neck provides additional tunability for the acoustic impedance of the absorber, and the operating frequency and bandwidth can be flexibly tuned in a wide band.Among the structural parameters, both the extended neck aperture and the extended neck tube length significantly affect the sound absorption performance of the sound absorber.The sound absorber has simple structure, thin thickness and good low frequency sound absorption performance.更多还原