Scholarlink

<p>This study proposes a multilayer labyrinth-type acoustic metamaterial with subwavelength thickness to overcome limitations of conventional structures like narrow bandwidth and poor low-frequency performance. A composite model integrating coiled channels and Helmholtz resonators was developed to enhance low-frequency broadband absorption. Through systematic optimization—including micro-perforated arrays, embedded cavities, and staggered windows—eight variants were designed. Model 8 achieved optimal performance: with 50 mm thickness, it enabled broadband absorption across 20–2000 Hz, exhibiting a peak absorption coefficient of 0.882 at 238 Hz—a thickness merely 1/29th of the corresponding wavelength, confirming deep-subwavelength characteristics. The effective bandwidth (absorption coefficient &gt;0.5) exceeded 325 Hz. Impedance tube tests validated simulations, with a root mean square error of 0.0975 and peak frequency deviations below 3 Hz. This study provides an efficient strategy for lightweight, broadband low-frequency sound absorption, suitable for advanced noise control systems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Broadband low-frequency sound absorption of a multi-mechanism optimized labyrinth acoustic metamaterial with subwavelength thickness

  • 期刊论文

  • 发表日期：

    2026年7月10日

查看全文
  • Tianjun He,
  • Tao Fu

摘要

This study proposes a multilayer labyrinth-type acoustic metamaterial with subwavelength thickness to overcome limitations of conventional structures like narrow bandwidth and poor low-frequency performance. A composite model integrating coiled channels and Helmholtz resonators was developed to enhance low-frequency broadband absorption. Through systematic optimization—including micro-perforated arrays, embedded cavities, and staggered windows—eight variants were designed. Model 8 achieved optimal performance: with 50 mm thickness, it enabled broadband absorption across 20–2000 Hz, exhibiting a peak absorption coefficient of 0.882 at 238 Hz—a thickness merely 1/29th of the corresponding wavelength, confirming deep-subwavelength characteristics. The effective bandwidth (absorption coefficient >0.5) exceeded 325 Hz. Impedance tube tests validated simulations, with a root mean square error of 0.0975 and peak frequency deviations below 3 Hz. This study provides an efficient strategy for lightweight, broadband low-frequency sound absorption, suitable for advanced noise control systems.