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<p>To address the challenge of low-frequency broadband noise control in high-voltage equipment, this study proposes a composite sound-absorbing structure integrating an acoustic black hole (ABH) and multi-layer micro-perforated plates (MPPs). Its core innovations lie in the design of a power-law decreasing perforation rate and the development of a corresponding theoretical model. Methodologically, a theoretical model and design method for this composite structure were established based on the ABH mechanism. Subsequently, finite element simulations were conducted to analyze the influence of MPPs parameters on sound absorption performance and identify optimal structural parameters. Finally, specimens were fabricated via three-dimensional (3D) printing, and impedance tube tests were carried out for performance validation. The results indicate that, with a total thickness not exceeding 100&#xa0;mm, the composite structure exhibits effective low-frequency broadband sound absorption within the measured frequency band of 195 ~ 1000&#xa0;Hz, achieving an average sound absorption coefficient of 0.7. This performance stems from the synergistic effect between the slow-wave effect of sound waves within the structure and optimized acoustic impedance matching. The proposed structure shows significant potential for engineering applications in space-constrained scenarios and provides a new approach for noise control in high-voltage equipment.</p>

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Design Optimization and Performance Analysis of Multi-Layer Micro-Perforated Panel-Acoustic Black Hole Hybrid Structure for Low-Frequency Noise Control in Electrical Grids

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Jingzhu Hu,
  • Bing Zhou,
  • Ni Li,
  • Yuan Ni

摘要

To address the challenge of low-frequency broadband noise control in high-voltage equipment, this study proposes a composite sound-absorbing structure integrating an acoustic black hole (ABH) and multi-layer micro-perforated plates (MPPs). Its core innovations lie in the design of a power-law decreasing perforation rate and the development of a corresponding theoretical model. Methodologically, a theoretical model and design method for this composite structure were established based on the ABH mechanism. Subsequently, finite element simulations were conducted to analyze the influence of MPPs parameters on sound absorption performance and identify optimal structural parameters. Finally, specimens were fabricated via three-dimensional (3D) printing, and impedance tube tests were carried out for performance validation. The results indicate that, with a total thickness not exceeding 100 mm, the composite structure exhibits effective low-frequency broadband sound absorption within the measured frequency band of 195 ~ 1000 Hz, achieving an average sound absorption coefficient of 0.7. This performance stems from the synergistic effect between the slow-wave effect of sound waves within the structure and optimized acoustic impedance matching. The proposed structure shows significant potential for engineering applications in space-constrained scenarios and provides a new approach for noise control in high-voltage equipment.