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With the gradual opening of the aviation market, there is an increasing demand for comfort in civil helicopters. The cabin noise reduction based on acoustic finite element simulation has become a key issue in helicopter design. The structure-acoustic coupling analysis is commonly used in vehicle NVH design, which has been verified to be an effective method for reducing low-frequency noise. The process of the structure-acoustic coupling analysis is firstly studied in this paper, then the detailed airframe model, the additional structure model, and the cabin acoustic cavity model are established for a civilian helicopter. The ACMODEL scheme is used to establish the structure-acoustic coupling model and analyze the coupling modes within 200Hz; The key structure for noise reduction is determined as the platform through mode contribution analysis; A platform interior with micro-perforated panel absorber is preliminarily designed, and analysis shows that it can reduce noise at the target location by about 8%.

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Research on Interior Noise Control in Lower Frequency of Helicopter Based on Structure-Acoustic Coupling Analysis

  • 会议论文

  • 发表日期：

    2026年

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  • Zhongwei Yin,
  • Hulin Wang,
  • Qingli Wang,
  • Yang Lu

摘要

With the gradual opening of the aviation market, there is an increasing demand for comfort in civil helicopters. The cabin noise reduction based on acoustic finite element simulation has become a key issue in helicopter design. The structure-acoustic coupling analysis is commonly used in vehicle NVH design, which has been verified to be an effective method for reducing low-frequency noise. The process of the structure-acoustic coupling analysis is firstly studied in this paper, then the detailed airframe model, the additional structure model, and the cabin acoustic cavity model are established for a civilian helicopter. The ACMODEL scheme is used to establish the structure-acoustic coupling model and analyze the coupling modes within 200Hz; The key structure for noise reduction is determined as the platform through mode contribution analysis; A platform interior with micro-perforated panel absorber is preliminarily designed, and analysis shows that it can reduce noise at the target location by about 8%.