Noise Reduction in Helicopter Cabins Using Microperforated Panel Composite Sound Absorption Structures
The high level of noise in helicopter cabins considerably compromises the comfort and safety of the pilot and passengers. To verify the feasibility and effectiveness of microperforated panel composite sound absorption structures for noise suppression in helicopter cabins, simulation and experimental...
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| Format: | Article |
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MDPI AG
2023-07-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/14/8153 |
| _version_ | 1797590431950700544 |
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| author | Chenglei Li Yang Lu Chunbo Lan Yang Wang |
| author_facet | Chenglei Li Yang Lu Chunbo Lan Yang Wang |
| author_sort | Chenglei Li |
| collection | DOAJ |
| description | The high level of noise in helicopter cabins considerably compromises the comfort and safety of the pilot and passengers. To verify the feasibility and effectiveness of microperforated panel composite sound absorption structures for noise suppression in helicopter cabins, simulation and experimental studies were conducted on a model of a light helicopter cabin. First, three microperforated composite sound absorption structures for the helicopter cabin wall panel were designed. Then, a finite element model of the main gear/body acoustic vibration coupling was established to obtain the target frequencies of the microperforated composite sound absorption structures; the acoustic effect was verified via simulation. Finally, a model helicopter cabin equipped with the three microperforated composite sound absorption structures was built, and a cabin noise test was performed. The test results showed that the combined microperforated panel acoustic structure and microperforated panel–porous material composite structure realized an overall cabin sound pressure level attenuation of 8–10 dB, on average, in a wide frequency range of 500–2000 Hz, with an amplitude of more than 20 dB. The microperforated panel–acoustic supermaterial composite structure achieved low-frequency sound absorption in the frequency range of 300–450 Hz. The sound absorption effect reached 50%, and it also exhibited good noise reduction effects in the middle- and high-frequency bands. |
| first_indexed | 2024-03-11T01:20:22Z |
| format | Article |
| id | doaj.art-29f4417ec7604e3c9a2a9dc94b3ac90f |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T01:20:22Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-29f4417ec7604e3c9a2a9dc94b3ac90f2023-11-18T18:09:02ZengMDPI AGApplied Sciences2076-34172023-07-011314815310.3390/app13148153Noise Reduction in Helicopter Cabins Using Microperforated Panel Composite Sound Absorption StructuresChenglei Li0Yang Lu1Chunbo Lan2Yang Wang3National Key Laboratory of Helicopter Dynamics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaNational Key Laboratory of Helicopter Dynamics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaNational Key Laboratory of Helicopter Dynamics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaNational Key Laboratory of Helicopter Dynamics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaThe high level of noise in helicopter cabins considerably compromises the comfort and safety of the pilot and passengers. To verify the feasibility and effectiveness of microperforated panel composite sound absorption structures for noise suppression in helicopter cabins, simulation and experimental studies were conducted on a model of a light helicopter cabin. First, three microperforated composite sound absorption structures for the helicopter cabin wall panel were designed. Then, a finite element model of the main gear/body acoustic vibration coupling was established to obtain the target frequencies of the microperforated composite sound absorption structures; the acoustic effect was verified via simulation. Finally, a model helicopter cabin equipped with the three microperforated composite sound absorption structures was built, and a cabin noise test was performed. The test results showed that the combined microperforated panel acoustic structure and microperforated panel–porous material composite structure realized an overall cabin sound pressure level attenuation of 8–10 dB, on average, in a wide frequency range of 500–2000 Hz, with an amplitude of more than 20 dB. The microperforated panel–acoustic supermaterial composite structure achieved low-frequency sound absorption in the frequency range of 300–450 Hz. The sound absorption effect reached 50%, and it also exhibited good noise reduction effects in the middle- and high-frequency bands.https://www.mdpi.com/2076-3417/13/14/8153helicoptercabin noise reductionmicroperforated panelcomposite acoustic structuresound field analysisacoustic metamaterials |
| spellingShingle | Chenglei Li Yang Lu Chunbo Lan Yang Wang Noise Reduction in Helicopter Cabins Using Microperforated Panel Composite Sound Absorption Structures Applied Sciences helicopter cabin noise reduction microperforated panel composite acoustic structure sound field analysis acoustic metamaterials |
| title | Noise Reduction in Helicopter Cabins Using Microperforated Panel Composite Sound Absorption Structures |
| title_full | Noise Reduction in Helicopter Cabins Using Microperforated Panel Composite Sound Absorption Structures |
| title_fullStr | Noise Reduction in Helicopter Cabins Using Microperforated Panel Composite Sound Absorption Structures |
| title_full_unstemmed | Noise Reduction in Helicopter Cabins Using Microperforated Panel Composite Sound Absorption Structures |
| title_short | Noise Reduction in Helicopter Cabins Using Microperforated Panel Composite Sound Absorption Structures |
| title_sort | noise reduction in helicopter cabins using microperforated panel composite sound absorption structures |
| topic | helicopter cabin noise reduction microperforated panel composite acoustic structure sound field analysis acoustic metamaterials |
| url | https://www.mdpi.com/2076-3417/13/14/8153 |
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