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To mitigate pump pipeline system noise, this paper presented a novel liquid-filled muffler with an internal shell structure. By integrating a perforated guide cone shell into the muffler design, this approach optimized internal fluid flow characteristics while enhancing acoustic attenuation performance. A COMSOL Multiphysics® version 6.2 simulation model investigated the effects of guide cone shell length, cross-sectional diameter, porosity, and perforation diameter on transmission loss (TL). TL curves were comparatively analyzed for different acoustic media within the shell structure. Results demonstrated that the built-in guide cone shell significantly enhanced muffler TL between 400–550 Hz. Increasing guide cone shell length and cross-sectional diameter yielded an approximate 28 dB TL increase at 460 Hz. Reducing porosity or enlarging perforation diameters shifted the TL curve toward lower frequencies, concurrently narrowing the effective noise reduction bandwidth and reducing peak amplitude. Decreasing the relative acoustic impedance of the shell-contained medium caused the peak TL frequency to shift downward.

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Analysis on Acoustic Performance of Liquid-Filled Muffler with Built-in Shell Structure

  • 会议论文

  • 发表日期：

    2026年

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  • Xingyu Cai,
  • Yinglong Zhao,
  • Jiuxiao Hou

摘要

To mitigate pump pipeline system noise, this paper presented a novel liquid-filled muffler with an internal shell structure. By integrating a perforated guide cone shell into the muffler design, this approach optimized internal fluid flow characteristics while enhancing acoustic attenuation performance. A COMSOL Multiphysics® version 6.2 simulation model investigated the effects of guide cone shell length, cross-sectional diameter, porosity, and perforation diameter on transmission loss (TL). TL curves were comparatively analyzed for different acoustic media within the shell structure. Results demonstrated that the built-in guide cone shell significantly enhanced muffler TL between 400–550 Hz. Increasing guide cone shell length and cross-sectional diameter yielded an approximate 28 dB TL increase at 460 Hz. Reducing porosity or enlarging perforation diameters shifted the TL curve toward lower frequencies, concurrently narrowing the effective noise reduction bandwidth and reducing peak amplitude. Decreasing the relative acoustic impedance of the shell-contained medium caused the peak TL frequency to shift downward.