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<p>A composite structure composed of a helix and an array of resonators is created to achieve large-amplitude and wide-band sound insulation in a pipe. Two helical structures with lengths of 5–7.5&#xa0;cm are designed to block sound within two frequency bands of 1100–1700&#xa0;Hz and 700–1100&#xa0;Hz, respectively. An array of eight resonators is adopted to produce sound attenuation in the frequency range from 900 to 2500&#xa0;Hz. Then, by assembling both structures, we can achieve large sound attenuation over 40&#xa0;dB in a frequency band between 1100 and 1700&#xa0;Hz or obtain an extremely wide frequency sound attenuation band of 700–2500&#xa0;Hz with transmission losses from 10 to 48 dB. Thus, owing to the composite structure of the sound insulator, the performance can be optimized according to practical requirements by adjusting the parameters of both parts. Moreover, because the helix and resonator array are both hollow structures, the composite sound insulator does not block airflow and is available in applications requiring natural ventilation.</p>

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A Composite Sound Insulator Composed of a Helix and a Resonator Array

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • Wenqing Diao,
  • Ningwo Pei,
  • Li Fan,
  • Shuyi Zhang,
  • Liping Cheng,
  • Xiaodong Xu

摘要

A composite structure composed of a helix and an array of resonators is created to achieve large-amplitude and wide-band sound insulation in a pipe. Two helical structures with lengths of 5–7.5 cm are designed to block sound within two frequency bands of 1100–1700 Hz and 700–1100 Hz, respectively. An array of eight resonators is adopted to produce sound attenuation in the frequency range from 900 to 2500 Hz. Then, by assembling both structures, we can achieve large sound attenuation over 40 dB in a frequency band between 1100 and 1700 Hz or obtain an extremely wide frequency sound attenuation band of 700–2500 Hz with transmission losses from 10 to 48 dB. Thus, owing to the composite structure of the sound insulator, the performance can be optimized according to practical requirements by adjusting the parameters of both parts. Moreover, because the helix and resonator array are both hollow structures, the composite sound insulator does not block airflow and is available in applications requiring natural ventilation.