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| Vibration Absorption Technology on the Support Structure of Main Gearbox for Helicopter Cabin Noise Reduction |
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| DOI：10.7643/issn.1672-9242.2022.09.013 |
| KeyWord:helicopter main gearbox supporting strut vibration absorption middle-high frequency cabin noise reduction |
| Author | Institution |
| WANG Feng-jiao |
China Helicopter Research and Development Institute, Jiangxi Jingdezhen, , China |
| LI Ao |
China Helicopter Research and Development Institute, Jiangxi Jingdezhen, , China |
| LI Ming-qiang |
China Helicopter Research and Development Institute, Jiangxi Jingdezhen, , China |
| LI Jian-wei |
Aviation Military Representative Office Stationed in Jingdezhen, Aviation Military Representative Bureau, Army Equipment Department, Jiangxi Jingdezhen, , China |
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| Abstract: |
| The structure-borne noise from main gearbox is one of the main noise sources in helicopter cabin. In order to realize the noise control, the vibration absorption design on the supporting structure of the main gearbox is proposed to suppress the vibration transmission from the gearbox to the fuselage. To verify its performances, based on a certain helicopter, the dynamic model of the supporting structure with the vibration absorber was established based on the transfer matrix method. Then, the dynamic model of the vibro-acoustic coupling system, including the supporting structure, the fuselage, and the cabin sound field, was established. On this basis, the influence of the vibration absorption frequency and weight on the vibration transmission characteristics of the supporting structure was analyzed. Furthermore, according to the requirements of a certain helicopter, a set of sample parameters was chosen, and the vibro-acoustic coupling simulation analysis was carried out. The analysis results shows that the vibration absorption can effectively control the structure-borne noise from main gearbox and the noise reduction of the target frequency can be more than 35 dB with a total weight of 4 kg, which providing a technology support for the schematic design of noise reduction in helicopter cabin. |
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